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Salvador Enrique Maestre Pérez has a Ph.D. in Chemical Sciences and currently works as a professor of Food Science and Analysis in the Department of Analytical Chemistry, Nutrition and Bromatology at the University of Alicante. He also belongs to the Food Analysis, Culinary Chemistry, and Nutrition research group at the same university, where he has been working as a researcher for more than ten years. The lines of research in which she has participated are: the characterization and development of sample introduction systems for elemental analysis using spectrometric analysis techniques that use Inductievely Coupled Plasma; the analysis of the fat fraction of foods such as almonds and peanuts; and the use of ultraviolet radiation as a tool to increase the shelf life of food products.
The presence of nuts in diets has notably increased due to their composition, and the presence of antioxidants and their unsaturated fatty acid profile has led to a considerable increase in their consumption. The volatile profile of nuts is important from different points of view. It affects consumer’s selection, influences raw material selection for the production of composite foods, dictates variety selection in breeding programs, and, from a quality perspective, its changes can indicate food degradation or alteration. A review of the published bibliography concerning the determination of volatiles in nuts has been carried out. The information retrieved has been divided into four main sections. First, a discussion on the main volatiles present in nuts is performed; next, a revision of the methods used to determine the volatiles is presented; and, finally, two sections describing how harvesting conditions, healthy state and the thermal treatment of nuts modifies their volatile profile are added. Analysis of the published bibliography denoted the complexity of volatile determination and the different variables that can modify the compounds present in the volatile fraction of nuts.
Arantzazu Valdés García; Raquel Sánchez Romero; Adriana Juan Polo; Soledad Prats Moya; Salvador Maestre Pérez; Ana Beltrán Sanahuja. Volatile Profile of Nuts, Key Odorants and Analytical Methods for Quantification. Foods 2021, 10, 1611 .
AMA StyleArantzazu Valdés García, Raquel Sánchez Romero, Adriana Juan Polo, Soledad Prats Moya, Salvador Maestre Pérez, Ana Beltrán Sanahuja. Volatile Profile of Nuts, Key Odorants and Analytical Methods for Quantification. Foods. 2021; 10 (7):1611.
Chicago/Turabian StyleArantzazu Valdés García; Raquel Sánchez Romero; Adriana Juan Polo; Soledad Prats Moya; Salvador Maestre Pérez; Ana Beltrán Sanahuja. 2021. "Volatile Profile of Nuts, Key Odorants and Analytical Methods for Quantification." Foods 10, no. 7: 1611.
The aim of this study was to develop a double function active packaging material for nuts. The packaging solution, on the one hand, integrated polybutadiene (PB) as an oxygen scavenger and, on the other hand, it incorporated peanut aroma (PA) to improve customer’s sensorial experience. Different formulations based on low density polyethylene (LDPE), commercial PA (5 wt %) and PB at two levels (5 wt % and 13 wt %) were obtained by cast film extrusion. The obtained films were compared in terms of their mechanical, structural, optical and thermal properties confirming a plasticizing effect of PA and PB resulting in an increase in the ductility of the polymer and in a slight decrease in the thermal properties, maintaining their transparency. Regarding the oxygen capacity of the films, values of 4.4 mL and 2.7 mL O2 g−1 film were obtained for PE/PA/PB13 and PE/PA/PB5, respectively, after 6 days proving the suitability of the UV irradiation treatment in improving the oxygen absorption capacity of PB without the need of a metal catalyst. The aroma retention capacity into the polymer matrix was also evaluated in the developed formulations. The incorporation of PB in 13 wt % into a LDPE matrix improved the PA retention. This behavior was attributed to the ability of PB in enhancing cross-linking of LDPE as the concentration of PB increases. The results suggested the potential of PE/PB/PB13 films as oxygen scavenger and aromatic food packaging system to offer protection against lipid oxidation in nuts.
Adriana Juan-Polo; Salvador Maestre Pérez; María Monedero Prieto; Ana Tone; Carmen Sánchez Reig; Ana Beltrán Sanahuja. Double-Function Oxygen Scavenger and Aromatic Food Packaging Films Based on LDPE/Polybutadiene and Peanut Aroma. Polymers 2021, 13, 1310 .
AMA StyleAdriana Juan-Polo, Salvador Maestre Pérez, María Monedero Prieto, Ana Tone, Carmen Sánchez Reig, Ana Beltrán Sanahuja. Double-Function Oxygen Scavenger and Aromatic Food Packaging Films Based on LDPE/Polybutadiene and Peanut Aroma. Polymers. 2021; 13 (8):1310.
Chicago/Turabian StyleAdriana Juan-Polo; Salvador Maestre Pérez; María Monedero Prieto; Ana Tone; Carmen Sánchez Reig; Ana Beltrán Sanahuja. 2021. "Double-Function Oxygen Scavenger and Aromatic Food Packaging Films Based on LDPE/Polybutadiene and Peanut Aroma." Polymers 13, no. 8: 1310.
Almonds show a great variability in their chemical composition. This variability is a result of the existence of a diverse range of almond cultivars, the self-incompatibility of most almond cultivars, and the heterogeneous harvesting conditions found around the different locations where almons are grown. In the last years, the discrimination among almond cultivars has been the focal point of some research studies to avoid fraud in protected geographical indications in almond products and also for selecting the best cultivars for a specific food application or the most interesting ones from a nutritional point of view. In this work, a revision of the recent research works related to the chemical characterization and classification of almond cultivars from different geographical origins has been carried out. The content of macronutrients, tocopherols, phytosterols, polyphenols, minerals, amino acids, and volatile compounds together with DNA fingerprint have been reported as possible cultivar and origin markers. The analysis of the results showed that no individual almond compound could be considered a universal biomarker to find differences among different almond cultivars. Hence, an adequate selection of variables or the employment of metabolomics and the application of multivariate statistical techniques is necessary when classification studies are carried out to obtain valuable results. Meanwhile, DNA fingerprinting is the perfect tool for compared cultivars based on their genetic origin.
Ana Beltrán Sanahuja; Salvador E. Maestre Pérez; Nuria Grané Teruel; Arantzazu Valdés García; María Soledad Prats Moya. Variability of Chemical Profile in Almonds (Prunus dulcis) of Different Cultivars and Origins. Foods 2021, 10, 153 .
AMA StyleAna Beltrán Sanahuja, Salvador E. Maestre Pérez, Nuria Grané Teruel, Arantzazu Valdés García, María Soledad Prats Moya. Variability of Chemical Profile in Almonds (Prunus dulcis) of Different Cultivars and Origins. Foods. 2021; 10 (1):153.
Chicago/Turabian StyleAna Beltrán Sanahuja; Salvador E. Maestre Pérez; Nuria Grané Teruel; Arantzazu Valdés García; María Soledad Prats Moya. 2021. "Variability of Chemical Profile in Almonds (Prunus dulcis) of Different Cultivars and Origins." Foods 10, no. 1: 153.
Agricultural selection programmes are, today, working hard to obtain novel raspberry cultivars with higher nutritional and commercial quality. One of those cultivars is “Adelita”. This study aims to provide novel tools for raspberry cultivar identification—more specifically, the differentiation of “Adelita” from other raspberry cultivars. To perform this study, five “Adelita” samples were analysed—four cultivated in Spain and one, in Morocco—and they were compared to seven samples from six raspberry cultivars (“P04”, “Lupita”, “Enrosadira”, “P10”, “Quanza” and “Versalles”). The physical parameters (mass, length, equatorial diameter and firmness) combined with the Total Phenolic Content (TPC); the antioxidant capacity according to the antioxidant activity tested with the 2,2-diphenyl-1-picrylhydrazyl (DPPH), ferric-reducing antioxidant power (FRAP) and 2,2-azinobis (3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt (ABTS) methods; and the main target volatile compounds were used as independent variables. Principal component and cluster analysis showed that the target volatiles and physical parameters together with the TPC and DPPH values could be useful to classify Adelita cultivars separately from the rest of the cultivars included in the work. Those results proved that the developed methodology could be proposed as a reliable approach for the identification of cultivar fraud in the supply chain.
Arantzazu Valdés García; Salvador E. Maestre Pérez; Mikita Butsko; María Soledad Prats Moya; Ana Beltrán Sanahuja. Authentication of “Adelita” Raspberry Cultivar Based on Physical Properties, Antioxidant Activity and Volatile Profile. Antioxidants 2020, 9, 593 .
AMA StyleArantzazu Valdés García, Salvador E. Maestre Pérez, Mikita Butsko, María Soledad Prats Moya, Ana Beltrán Sanahuja. Authentication of “Adelita” Raspberry Cultivar Based on Physical Properties, Antioxidant Activity and Volatile Profile. Antioxidants. 2020; 9 (7):593.
Chicago/Turabian StyleArantzazu Valdés García; Salvador E. Maestre Pérez; Mikita Butsko; María Soledad Prats Moya; Ana Beltrán Sanahuja. 2020. "Authentication of “Adelita” Raspberry Cultivar Based on Physical Properties, Antioxidant Activity and Volatile Profile." Antioxidants 9, no. 7: 593.
BACKGROUND The study of almond fat stability is essential from a quality control perspective meanly because, in most of the cases, almonds are sold skinned and thermally treated. In this work an alternative method to Rancimat test based on Attenuated Total Reflectance‐Fourier Transform Infrared Spectrometry (ATR‐FTIR) was adapted for checking the induced degradation at 75 °C of seven almond oil cultivars, three of top California producing varieties, and, four traditional cultivars harvested in Spain. RESULTS The thermal oil degradation evolution was followed by measuring the changes in the absorbance of the selected FTIR spectra bands (3470, 3006, 1730, 1630, 988 and 970 cm‐1). A first‐order kinetic behaviour was observed, after an induction time in all bands. CONCLUSIONS Kinetic coefficients and induction times were easily obtained as the absorbance values (from difference spectra) fitted to pseudo‐first‐order kinetics after the induction time. Principal Component analysis was applied to the kinetic parameters to visualised which variables could be useful to classify the almond cultivars based on their resistance to thermal oxidation processes. It was found that selecting only the induction times corresponding to the bands 3470, 3006, 1630 and 970 cm‐1 a separate classification of the Californian cultivars from the Spanish ones was possible. Finally, a linear discriminant analysis was assayed using only the four induction times previously selected. Validated classification and correct in 100 % of the cases was obtained for all the samples based on their Spanish or Californian origin. This article is protected by copyright. All rights reserved.
Iván P. Román Falcó; María Soledad Prats Moya; Salvador E. Maestre Pérez; M. Luisa Martín Carratalá; Nuria Grané Teruel. Chemometric comparison of almond oxidation rates using kinetic parameters obtained by infrared spectroscopy. Journal of the Science of Food and Agriculture 2020, 100, 4549 -4557.
AMA StyleIván P. Román Falcó, María Soledad Prats Moya, Salvador E. Maestre Pérez, M. Luisa Martín Carratalá, Nuria Grané Teruel. Chemometric comparison of almond oxidation rates using kinetic parameters obtained by infrared spectroscopy. Journal of the Science of Food and Agriculture. 2020; 100 (12):4549-4557.
Chicago/Turabian StyleIván P. Román Falcó; María Soledad Prats Moya; Salvador E. Maestre Pérez; M. Luisa Martín Carratalá; Nuria Grané Teruel. 2020. "Chemometric comparison of almond oxidation rates using kinetic parameters obtained by infrared spectroscopy." Journal of the Science of Food and Agriculture 100, no. 12: 4549-4557.
In this study, six different sofrito formulations were compared with the raw recipe for total phenolic content (TPC), antioxidant activity tested by 2,2-diphenyl-1-picrylhydrazyl (DPPH), ferric-reducing antioxidant power (FRAP) and 2,2-azinobis (3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt (ABTS) methods. The volatile profile was also obtained by the headspace solid-phase microextraction-gas chromatography mass spectrometry (HS-SPME-GC–MS) procedure. The cooking process and the addition of herbs, and garlic improved the final content of antioxidant compounds compared to the basic recipe and the raw ingredients. The total volatile content was higher in the samples that contained rosemary and thymus. Some of the volatiles had proven antioxidant properties and for that reason the sofrito with rosemary with the higher volatile content was also the one with the higher antioxidant capacity and TPC. In conclusion, as well as the processing technique, the addition of selected typical Mediterranean herbs apart from given flavour can contribute to improving the nutritional antioxidant profile of dishes and be used as a natural method to increase the shelf-life of preparation.
Ana Beltrán Sanahuja; Saray López De Pablo Gallego; Salvador E. Maestre Pérez; Arantzazu Valdés García; María Soledad Prats Moya. Influence of Cooking and Ingredients on the Antioxidant Activity, Phenolic Content and Volatile Profile of Different Variants of the Mediterranean Typical Tomato Sofrito. Antioxidants 2019, 8, 551 .
AMA StyleAna Beltrán Sanahuja, Saray López De Pablo Gallego, Salvador E. Maestre Pérez, Arantzazu Valdés García, María Soledad Prats Moya. Influence of Cooking and Ingredients on the Antioxidant Activity, Phenolic Content and Volatile Profile of Different Variants of the Mediterranean Typical Tomato Sofrito. Antioxidants. 2019; 8 (11):551.
Chicago/Turabian StyleAna Beltrán Sanahuja; Saray López De Pablo Gallego; Salvador E. Maestre Pérez; Arantzazu Valdés García; María Soledad Prats Moya. 2019. "Influence of Cooking and Ingredients on the Antioxidant Activity, Phenolic Content and Volatile Profile of Different Variants of the Mediterranean Typical Tomato Sofrito." Antioxidants 8, no. 11: 551.
Microwave (MW) radiation was applied to perform the separation of triacylglycerols (TGs) in oil samples. The novelty of the work lies in the application of MW radiation to assist the separation of several non-polar compounds employing a totally organic mobile phase. Once the influence of the evaporative light scattering detector (ELSD) variables on the sensitivity was optimized, the TGs separation was compared conditioning the column with either a conventional HPLC or a MW oven. Contrary to previous applications in which the mobile phase contained water, the improvement in sensitivity using MW was not as significant in comparison with conventional heating but it allowed a shortening in the retention times of several TGs in about 50% respect elution at room temperature. The method was finally applied for the quantification of most common TGs in almond, tiger nut, and argan oil.
Silvia Carballo-Marrero; Maria Soledad Prats-Moya; Salvador E. Maestre; José-Luis Todolí-Torró. Microwave assisted high performance liquid chromatography for the separation of triacylglycerols in vegetable oils using an evaporative light scattering detector. Food Chemistry 2019, 300, 125203 .
AMA StyleSilvia Carballo-Marrero, Maria Soledad Prats-Moya, Salvador E. Maestre, José-Luis Todolí-Torró. Microwave assisted high performance liquid chromatography for the separation of triacylglycerols in vegetable oils using an evaporative light scattering detector. Food Chemistry. 2019; 300 ():125203.
Chicago/Turabian StyleSilvia Carballo-Marrero; Maria Soledad Prats-Moya; Salvador E. Maestre; José-Luis Todolí-Torró. 2019. "Microwave assisted high performance liquid chromatography for the separation of triacylglycerols in vegetable oils using an evaporative light scattering detector." Food Chemistry 300, no. : 125203.
In this study, the removal of parabens from waters, using a combined treatment of magnetic ion exchange resins and subsequent filtration through nanofiltration membranes, was investigated. The selected parabens were methylparaben, ethylparaben, propylparaben and butylparaben. Two different magnetic anionic exchanger resins, MIEX® DOC and MIEX® GOLD, and two nanofiltration membranes (NF), NF-90 and DESAL-HL, were tested. The study was carried out using mono and multicomponent systems, using deionized water and natural waters sampled from two different rivers. In this way, competitive and matrix effects could be evaluated. The results showed, that with the combined treatments, higher elimination rates were obtained. The best removal efficiencies were obtained when the DOC resin was combined with both NF-90 and DESAL-HL membranes. Thus, butylparaben and propylparaben reached removal yields around 100% with both membranes, whereas the corresponding values for methylparaben were 91%, when the NF-90 membrane was employed, or 92% when DESAL-HL membrane was utilized. The elimination rates of ethylparaben with the same treatments were 96% with the NF-90 and 97% when the DESAL-HL membrane was combined with the DOC resin. The elimination percentages were higher as the paraben alkyl chain length increased. In addition, no competitiveness or matrix effects were detected. When the MIEX® GOLD resin was used for pre-treatment, membrane fouling worsened which indicated that resin selection needs to be carefully considered to achieve the best results.
Carmen M. López-Ortiz; Irene Sentana Gadea; Pedro Varó-Galvañ; Salvador E. Maestre; Daniel Prats-Rico. The use of combined treatments for reducing parabens in surface waters: Ion-exchange resin and nanofiltration. Science of The Total Environment 2018, 639, 228 -236.
AMA StyleCarmen M. López-Ortiz, Irene Sentana Gadea, Pedro Varó-Galvañ, Salvador E. Maestre, Daniel Prats-Rico. The use of combined treatments for reducing parabens in surface waters: Ion-exchange resin and nanofiltration. Science of The Total Environment. 2018; 639 ():228-236.
Chicago/Turabian StyleCarmen M. López-Ortiz; Irene Sentana Gadea; Pedro Varó-Galvañ; Salvador E. Maestre; Daniel Prats-Rico. 2018. "The use of combined treatments for reducing parabens in surface waters: Ion-exchange resin and nanofiltration." Science of The Total Environment 639, no. : 228-236.
In this study, the removal of nine emerging organic contaminants was investigated by using anion exchange resins. The selected compounds were carbamazepine, atrazine, simazine, estrone, bisphenol A, methylparaben, ethylparaben, propylparaben and butylparaben. Two different magnetic anionic exchanger resins were tested: MIEX® DOC and MIEX® GOLD. The optimal resin dose (40 mL/L) and contact time (20 min) had been previously determined. Once these optimum parameters were set, the effect of the initial concentration of contaminants on the removal efficiency of the contaminants by the resins was studied. The study was carried out using mono and multicomponent systems, with distilled water and natural waters, to which contaminants had been previously added, in order to evaluate the competitive and matrix effects. Results showed that the average removal percentages obtained with the MIEX® DOC resin were: 51%, 61%, 68% and 80% for methyl-, ethyl-, propyl-, and butylparaben, respectively. For bisphenol A the result was similar, i.e., 66%, whereas for the rest of the compounds studied, removal efficiencies lower than 15% were obtained. The MIEX® GOLD resin achieved lower elimination rates than the MIEX® DOC resin in all cases.
C.M. López-Ortiz; Irene Sentana Gadea; P.J. Varó-Galvañ; S.E. Maestre-Pérez; D. Prats-Rico. Effect of magnetic ion exchange (MIEX®) on removal of emerging organic contaminants. Chemosphere 2018, 208, 433 -440.
AMA StyleC.M. López-Ortiz, Irene Sentana Gadea, P.J. Varó-Galvañ, S.E. Maestre-Pérez, D. Prats-Rico. Effect of magnetic ion exchange (MIEX®) on removal of emerging organic contaminants. Chemosphere. 2018; 208 ():433-440.
Chicago/Turabian StyleC.M. López-Ortiz; Irene Sentana Gadea; P.J. Varó-Galvañ; S.E. Maestre-Pérez; D. Prats-Rico. 2018. "Effect of magnetic ion exchange (MIEX®) on removal of emerging organic contaminants." Chemosphere 208, no. : 433-440.
A novel extraction method was developed, optimized and validated for the elemental analysis of organic samples. The method, called aerosol phase extraction (APE), was based on the nebulization of the extracting aqueous solution (0.1 mol L-1 nitric acid) on the sample. The extraction was performed at the interface of each generated extractant droplets as they entered in contact with the samples. Afterwards, the phases were allowed to separate and Ca, K, Na and Mg were determined in aqueous phase by means of inductively coupled plasma optical emission spectroscopy (ICP-OES). Measurement of aerosol characteristics demonstrated that a water-in-oil emulsion was generated. Therefore, once the aqueous solution was dispersed into the sample, the phases spontaneously separated. Furthermore, the interfacial specific surface area took values on the order of 1 m2 mL-1, hence enhancing the extraction kinetics over a conventional extraction method. The key variables affecting the extraction yield were: the nebulization gas flow rate, liquid flow rate, extraction time, acid concentration, nebulizer tip to sample surface gap and mOrganic phase/mAqueous phase ratio. Once the optimum conditions were selected, the method was applied and validated for the determination of Ca, K, Na and Mg by ICP-OES in 0.5 mL biodiesel samples with an expanded uncertainty of around 1%. With the APE method, the extraction time was around 1 minute, whereas conventional methods employed to perform this kind of extraction required from 4 to 50 minutes. Additionally, the APE involved the analytes preconcentration thus lowering the limits of detection down to the ng mL-1 level (i.e., LODs based on the 3 sb criterion were 32, 20, 19 and 24 ng mL-1 for Ca, K, Na and Mg, respectively). Furthermore, accuracy when quantification of Ca, K, Na and Mg concentration using APE was not significantly different as compared to that afforded by conventional liquid-liquid extraction. Finally, Ca, K, Na and Mg contents were determined in four real samples in the 0.5-13 mg kg-1 range. The obtained results were not statistically different to those encountered with a microwave-based digestion method.
Raquel Sánchez; Salvador Maestre; Soledad Prats; José-Luis Todolí. Aerosol-Phase Extraction Method for Determination of Ca, K, Mg, and Na in Biodiesel through Inductively Coupled Plasma Optical Emission Spectrometry. Analytical Chemistry 2017, 89, 13618 -13625.
AMA StyleRaquel Sánchez, Salvador Maestre, Soledad Prats, José-Luis Todolí. Aerosol-Phase Extraction Method for Determination of Ca, K, Mg, and Na in Biodiesel through Inductively Coupled Plasma Optical Emission Spectrometry. Analytical Chemistry. 2017; 89 (24):13618-13625.
Chicago/Turabian StyleRaquel Sánchez; Salvador Maestre; Soledad Prats; José-Luis Todolí. 2017. "Aerosol-Phase Extraction Method for Determination of Ca, K, Mg, and Na in Biodiesel through Inductively Coupled Plasma Optical Emission Spectrometry." Analytical Chemistry 89, no. 24: 13618-13625.
A proof of concept study involving the online coupling of automatic dispersive liquid–liquid microextraction (DLLME) to inductively coupled plasma optical emission spectrometry (ICP OES) with direct introduction and analysis of the organic extract is herein reported for the first time. The flow-based analyzer features a lab-in-syringe (LIS) setup with an integrated stirring system, a Meinhard nebulizer in combination with a heated single-pass spray chamber, and a rotary injection valve, used as an online interface between the microextraction system and the detection instrument. Air-segmented flow was used for delivery of a fraction of the nonwater miscible extraction phase, 12 μL of xylene, to the nebulizer. All sample preparative steps including magnetic stirring assisted DLLME were carried out inside the syringe void volume as a size-adaptable yet sealed mixing and extraction chamber. Determination of trace level concentrations of cadmium, copper, lead, and silver as model analytes has been demonstrated by microextraction as diethyldithiophosphate (DDTP) complexes. The automatic LIS-DLLME method features quantitative metal extraction, even in troublesome sample matrixes, such as seawater, salt, and fruit juices, with relative recoveries within the range of 94–103%, 93–100%, and 92–99%, respectively. Furthermore, no statistically significant differences at the 0.05 significance level were found between concentration values experimentally obtained and the certified values of two serum standard reference materials.
Raquel Sánchez; Burkhard Horstkotte; Kateřina Fikarová; Hana Sklenářová; Salvador Maestre; Manuel Miró; Jose-Luis Todolí. Fully Automatic In-Syringe Magnetic Stirring-Assisted Dispersive Liquid–Liquid Microextraction Hyphenated to High-Temperature Torch Integrated Sample Introduction System-Inductively Coupled Plasma Spectrometer with Direct Injection of the Organic Phase. Analytical Chemistry 2017, 89, 3787 -3794.
AMA StyleRaquel Sánchez, Burkhard Horstkotte, Kateřina Fikarová, Hana Sklenářová, Salvador Maestre, Manuel Miró, Jose-Luis Todolí. Fully Automatic In-Syringe Magnetic Stirring-Assisted Dispersive Liquid–Liquid Microextraction Hyphenated to High-Temperature Torch Integrated Sample Introduction System-Inductively Coupled Plasma Spectrometer with Direct Injection of the Organic Phase. Analytical Chemistry. 2017; 89 (6):3787-3794.
Chicago/Turabian StyleRaquel Sánchez; Burkhard Horstkotte; Kateřina Fikarová; Hana Sklenářová; Salvador Maestre; Manuel Miró; Jose-Luis Todolí. 2017. "Fully Automatic In-Syringe Magnetic Stirring-Assisted Dispersive Liquid–Liquid Microextraction Hyphenated to High-Temperature Torch Integrated Sample Introduction System-Inductively Coupled Plasma Spectrometer with Direct Injection of the Organic Phase." Analytical Chemistry 89, no. 6: 3787-3794.
This work describes for the first time the comparison of the analytical performances obtained with a high temperature torch integrated sample introduction system (hTISIS) against those found with a commercially available desolvation system (APEX) associated with inductively coupled plasma mass spectrometry (ICP-MS). A double pass spray chamber was taken as the reference system. Similar detection limits and sensitivities were obtained in continuous injection mode at low liquid flow rates for the APEX and hTISIS operating at high temperatures. In contrast, in the air-segmented injection mode, the detection limits obtained with hTISIS at high temperatures were up to 12 times lower than those found for the APEX. Regarding memory effects, wash out times were shorter in continuous mode and peaks were narrower in air segmented mode for the hTISIS as compared to the APEX. Non spectral interferences (matrix effects) were studied with 10% nitric acid, 2% methanol, for an ICP multielemental solution and a hydro-organic matrix containing 70% (v/v) acetonitrile in water, 15 mmol L− 1 ammonium acetate and 0.5% formic acid containing lanthanide complexes. In all the cases, matrix effects were less severe for the hTISIS operating at 200 °C and the APEX than for the double pass spray chamber. Finally, two spiked reference materials (sea water and Antartic krill) were analyzed. The hTISIS operating at 200 °C gave the best results compared to those obtained with the APEX and the double pass spray chamber. In conclusion, despite the simplicity of the hTISIS, it provided, at low liquid flow rates, results similar to or better than those obtained with the by other sample introduction systems.
Raquel Sánchez; Agueda Cañabate; Carole Bresson; Frédéric Chartier; Hélène Isnard; Salvador Maestre; Anthony Nonell; Jose-Luis Todolí. Comparison of a high temperature torch integrated sample introduction system with a desolvation system for the analysis of microsamples through inductively coupled plasma mass spectrometry. Spectrochimica Acta Part B: Atomic Spectroscopy 2017, 129, 28 -36.
AMA StyleRaquel Sánchez, Agueda Cañabate, Carole Bresson, Frédéric Chartier, Hélène Isnard, Salvador Maestre, Anthony Nonell, Jose-Luis Todolí. Comparison of a high temperature torch integrated sample introduction system with a desolvation system for the analysis of microsamples through inductively coupled plasma mass spectrometry. Spectrochimica Acta Part B: Atomic Spectroscopy. 2017; 129 ():28-36.
Chicago/Turabian StyleRaquel Sánchez; Agueda Cañabate; Carole Bresson; Frédéric Chartier; Hélène Isnard; Salvador Maestre; Anthony Nonell; Jose-Luis Todolí. 2017. "Comparison of a high temperature torch integrated sample introduction system with a desolvation system for the analysis of microsamples through inductively coupled plasma mass spectrometry." Spectrochimica Acta Part B: Atomic Spectroscopy 129, no. : 28-36.
In this manuscript, a study of the effect of microwave radiation on the high-performance liquid chromatography separation of tocopherols and vitamin K1 was conducted. The novelty of the application was the use of a relatively low polarity mobile phase in which the dielectric heating effect was minimized to evaluate the nonthermal effect of the microwave radiation over the separation process. Results obtained show that microwave-assisted high-performance liquid chromatography had a shorter analysis time from 31.5 to 13.3 min when the lowest microwave power was used. Moreover, narrower peaks were obtained; hence the separation was more efficient maintaining or even increasing the resolution between the peaks. This result confirms that the increase in mobile phase temperature is not the only variable for improving the separation process but also other nonthermal processes must intervene. Fluorescence detection demonstrated better signal-to-noise compared to photodiode arrayed detection mainly due to the independent effect of microwave pulses on the baseline noise, but photodiode array detection was finally chosen as it allowed a simultaneous detection of nonfluorescent compounds. Finally, a determination of the content of the vitamin E homologs was carried out in different vegetable oils. Results were coherent with those found in the literature.
Silvia Carballo; Soledad Prats; Salvador Maestre; José-Luis Todolí. Determination of fat-soluble vitamins in vegetable oils through microwave-assisted high-performance liquid chromatography. Journal of Separation Science 2015, 38, 1073 -1081.
AMA StyleSilvia Carballo, Soledad Prats, Salvador Maestre, José-Luis Todolí. Determination of fat-soluble vitamins in vegetable oils through microwave-assisted high-performance liquid chromatography. Journal of Separation Science. 2015; 38 (7):1073-1081.
Chicago/Turabian StyleSilvia Carballo; Soledad Prats; Salvador Maestre; José-Luis Todolí. 2015. "Determination of fat-soluble vitamins in vegetable oils through microwave-assisted high-performance liquid chromatography." Journal of Separation Science 38, no. 7: 1073-1081.
Inductively Coupled Plasma Optical Emission Spectrometry (ICP-OES) has been employed to carry out the determination of both major anions and cations in water samples. The anion quantification has been performed by means of a new automatic accessory. In this device chloride has been determined by continuously adding a silver nitrate solution. As a result solid silver chloride particles are formed and retained on a nylon filter inserted in the line. The emission intensity is read at a silver characteristic wavelength. By plotting the drop in silver signal versus the chloride concentration, a straight line is obtained. As regards bicarbonate, this anion has been on-line transformed into carbon dioxide with the help of a 2.0 mol L−1 nitric acid stream. Carbon signal is linearly related with bicarbonate concentration. Finally, information about sulfate concentration has been achieved by means of the measurement of sulfur emission intensity. All the steps have been simultaneously and automatically performed. With this setup detection limits have been 1.0, 0.4 and 0.09 mg L−1 for chloride, bicarbonate and sulfate, respectively. Furthermore, it affords good precision with RSD below 6 %. Cation (Ca, Mg, Na and K) concentration, in turn, has been obtained by simultaneously reading the emission intensity at characteristic wavelengths. The obtained limits of detection have been 8 × 10−3, 2 × 10−3, 8 × 10−4 and 10−2 mg L−1 for sodium, potassium, magnesium and calcium, respectively. As regards sample throughput, about 30 samples h−1 can be analysed. Validation results have revealed that the obtained concentrations for these anions are not significantly different as compared to the data provided by conventional methods. Finally, by considering the data for anions and cations, precise ion balances have been obtained for well and mineral water samples.
Carlos Sánchez; Salvador E. Maestre; María Soledad Prats; José Luis Todolí. Ion balance in waters through inductively coupled plasma optical emission spectrometry. International Journal of Environmental Analytical Chemistry 2013, 94, 427 -440.
AMA StyleCarlos Sánchez, Salvador E. Maestre, María Soledad Prats, José Luis Todolí. Ion balance in waters through inductively coupled plasma optical emission spectrometry. International Journal of Environmental Analytical Chemistry. 2013; 94 (5):427-440.
Chicago/Turabian StyleCarlos Sánchez; Salvador E. Maestre; María Soledad Prats; José Luis Todolí. 2013. "Ion balance in waters through inductively coupled plasma optical emission spectrometry." International Journal of Environmental Analytical Chemistry 94, no. 5: 427-440.
Three HPLC methods were optimised for the determination of citric acid, succinic acid and ascorbic acid using a photodiode array detector and fructose, glucose and sucrose using a refractive index in twenty eight citrus juices. The analysis was completed in <16 min. Two different harvests were taken into account for this study. For the season 2011, ascorbic acid content was comprised between 19.4 and 59 mg vitamin C/100 mL; meanwhile for the season 2012, the content was slightly higher for most of the samples ranging from 33.5 to 85.3 mg vitamin C/100 mL. Moreover, the citric acid content in orange juices ranged between 9.7 and 15.1 g L−1, while for clementines the content was clearly lower (i.e. from 3.5 to 8.4 g L−1). However, clementines showed the highest sucrose content with values near to 6 g/100 mL. Finally, a cluster analysis was applied to establish a classification of the citrus species.
Silvia Carballo; Fabrizio A. Zingarello; Salvador E. Maestre; Jose Luis Todoli; M. Soledad Prats. Optimisation of analytical methods for the characterisation of oranges, clementines and citrus hybrids cultivated in Spain on the basis of their composition in ascorbic acid, citric acid and major sugars. International Journal of Food Science & Technology 2013, 49, 146 -152.
AMA StyleSilvia Carballo, Fabrizio A. Zingarello, Salvador E. Maestre, Jose Luis Todoli, M. Soledad Prats. Optimisation of analytical methods for the characterisation of oranges, clementines and citrus hybrids cultivated in Spain on the basis of their composition in ascorbic acid, citric acid and major sugars. International Journal of Food Science & Technology. 2013; 49 (1):146-152.
Chicago/Turabian StyleSilvia Carballo; Fabrizio A. Zingarello; Salvador E. Maestre; Jose Luis Todoli; M. Soledad Prats. 2013. "Optimisation of analytical methods for the characterisation of oranges, clementines and citrus hybrids cultivated in Spain on the basis of their composition in ascorbic acid, citric acid and major sugars." International Journal of Food Science & Technology 49, no. 1: 146-152.
In this chapter, we will discuss the use of High Temperature Liquid Chromatography (HTLC) to carry out food analysis. Attention will be paid to the coupling of this separation technique to an Inductively Coupled Plasma Atomic Emission Spectrometer (ICP-AES). As regards the determination of maltose, it has been traditionally carried out through High Performance Liquid Chromatography (HPLC) coupled to several detectors such as refractometric index (RI) and Visible-Ultraviolet detector (VIS-UV). Additional detectors have been applied to the sugar determination such as the Evaporative Light Scattering Detector (ELSD), with good results. Inductively Coupled Plasma Atomic Emission Spectrometer (ICP-AES) has been used as a HPLC detector providing information of both organic as well as inorganic compounds in food samples. The High Temperature Liquid Chromatography Inductively Coupled Plasma Atomic Emission Spectrometer (HTLC-ICP-AES) hyphenation is thus interesting because of the shortening in retention times, with the concomitant reduction in the cost of the analysis. All these points are commented in the present chapter together with selected applications in which maltose has been determined in food samples.
Amanda Terol; Soledad Prats; Salvador E. Maestre; José Luis Todolí. CHAPTER 25. Determination of Maltose in Food Samples by High-temperature Liquid Chromatography Coupled to ICP-AES. Food and Nutritional Components in Focus 2012, 425 -442.
AMA StyleAmanda Terol, Soledad Prats, Salvador E. Maestre, José Luis Todolí. CHAPTER 25. Determination of Maltose in Food Samples by High-temperature Liquid Chromatography Coupled to ICP-AES. Food and Nutritional Components in Focus. 2012; ():425-442.
Chicago/Turabian StyleAmanda Terol; Soledad Prats; Salvador E. Maestre; José Luis Todolí. 2012. "CHAPTER 25. Determination of Maltose in Food Samples by High-temperature Liquid Chromatography Coupled to ICP-AES." Food and Nutritional Components in Focus , no. : 425-442.
In the present work, an evaporative light scattering detector was used as a high-temperature liquid chromatography detector for the determination of carbohydrates. The compounds studied were glucose, fructose, galactose, sucrose, maltose, and lactose. The effect of column temperature on the retention times and detectability of these compounds was investigated. Column heating temperatures ranged from 25 to 175°C. The optimum temperature in terms of peak resolution and detectability with pure water as mobile phase and a liquid flow rate of 1 mL/min was 150°C as it allowed the separation of glucose and the three disaccharides here considered in less than 3 min. These conditions were employed for lactose determination in milk samples. Limits of quantification were between 2 and 4.7 mg/L. On the other hand, a temperature gradient was developed for the simultaneous determination of glucose, fructose, and sucrose in orange juices, due to coelution of monosaccharides at temperatures higher than 70°C, being limits of quantifications between 8.5 and 12 mg/L. The proposed hyphenation was successfully applied to different types of milk and different varieties of oranges and mandarins. Recoveries for spiked samples were close to 100% for all the studied analytes.
Amanda Terol; Eduardo Paredes; Salvador E. Maestre; Soledad Prats; Jose Luis Todoli. Rapid and sensitive determination of carbohydrates in foods using high temperature liquid chromatography with evaporative light scattering detection. Journal of Separation Science 2012, 35, 929 -936.
AMA StyleAmanda Terol, Eduardo Paredes, Salvador E. Maestre, Soledad Prats, Jose Luis Todoli. Rapid and sensitive determination of carbohydrates in foods using high temperature liquid chromatography with evaporative light scattering detection. Journal of Separation Science. 2012; 35 (8):929-936.
Chicago/Turabian StyleAmanda Terol; Eduardo Paredes; Salvador E. Maestre; Soledad Prats; Jose Luis Todoli. 2012. "Rapid and sensitive determination of carbohydrates in foods using high temperature liquid chromatography with evaporative light scattering detection." Journal of Separation Science 35, no. 8: 929-936.
The present work describes the first attempt to use microwave reversed phase high performance liquid chromatography (MW-HPLC) to carry out the separation of organic compounds. Biotin and riboflavin were selected for the characterization of the new separation technique. Additional vitamins (nicotinamide, pyri
Amanda Terol; Salvador E. Maestre; Soledad Prats; Jose Luis Todoli. Microwave high performance liquid chromatography with UV-visible detection. Application to vitamins determination. The Analyst 2012, 137, 2260 -2266.
AMA StyleAmanda Terol, Salvador E. Maestre, Soledad Prats, Jose Luis Todoli. Microwave high performance liquid chromatography with UV-visible detection. Application to vitamins determination. The Analyst. 2012; 137 (9):2260-2266.
Chicago/Turabian StyleAmanda Terol; Salvador E. Maestre; Soledad Prats; Jose Luis Todoli. 2012. "Microwave high performance liquid chromatography with UV-visible detection. Application to vitamins determination." The Analyst 137, no. 9: 2260-2266.
The capabilities of inductively coupled plasma atomic emission spectrometry (ICP-AES) for the determination of water-soluble vitamins after high-performance liquid chromatography (HPLC) separation have been evaluated for the first time in the present work. Thanks to the multielemental capability of ICP-AES, it has been possible to develop a method for the joint determination of several water-soluble vitamins and minerals. The vitamin chromatograms were obtained by plotting the carbon corrected emission intensity against time. Meanwhile, minerals were determined through the measurement of the emission intensity at their characteristic wavelengths. The established method was applied to the determination of thiamine, riboflavin, pantothenic acid, nicotinamide, ascorbic acid, Cr, Mo, Se, Mn, Zn, Fe, Mg, Ca, and K in multivitamin complexes. Good linearities were obtained, with correlation coefficients above 0.999 for all the vitamins and metals. The detection limits using ICP-AES for vitamins were lower than 10 mg L−1 except for biotin (18 mg L−1) and ascorbic acid (35 mg L−1). Moreover, the limits of detection for metals ranged from 0.3 mg L−1 for K and 0.02 mg L−1 for Mo. Even though the ICP is less sensitive than PDA and MS for vitamin determination, the HPLC-ICP-AES allows determination of vitamins and minerals in a period of time not much higher than that required for the simple determination of the minerals, and it is less sensitive to interferences in trace quantities.
E. Paredes; M. S. Prats; Salvador E. Maestre; Jose Luis Todoli. Development of an Analytical Method for the Combined Determination of Water-Soluble Vitamins and Minerals Through High-Performance Liquid Chromatography–Inductively Coupled Plasma Atomic Emission Spectrometry Hyphenation. Food Analytical Methods 2011, 5, 897 -908.
AMA StyleE. Paredes, M. S. Prats, Salvador E. Maestre, Jose Luis Todoli. Development of an Analytical Method for the Combined Determination of Water-Soluble Vitamins and Minerals Through High-Performance Liquid Chromatography–Inductively Coupled Plasma Atomic Emission Spectrometry Hyphenation. Food Analytical Methods. 2011; 5 (4):897-908.
Chicago/Turabian StyleE. Paredes; M. S. Prats; Salvador E. Maestre; Jose Luis Todoli. 2011. "Development of an Analytical Method for the Combined Determination of Water-Soluble Vitamins and Minerals Through High-Performance Liquid Chromatography–Inductively Coupled Plasma Atomic Emission Spectrometry Hyphenation." Food Analytical Methods 5, no. 4: 897-908.
In the present work, an inductively coupled plasma atomic emission spectrometry (ICP-AES) system was used as a high temperature liquid chromatography (HTLC) detector for the determination of alcohols and metals in beverages. For the sake of comparison, a refractive index (RI) detector was also employed for the first time to detect alcohols with HTLC. The organic compounds studied were methanol, ethanol, propan-1-ol and butan-1-ol (in the 10-125 mg/L concentration range) and the elements tested were magnesium, aluminum, copper, manganese and barium at concentrations included between roughly 0.01 and 80 mg/L. Column heating temperatures ranged from 80 to 175 °C and the optimum ones in terms of peak resolution, sensitivity and column lifetime were 125 and 100 °C for the HTLC-RI and HTLC-ICP-AES couplings, respectively. The HTLC-ICP-AES interface design (i.e., spray chamber design and nebulizer type used) was studied and it was found that a single pass spray chamber provided about 2 times higher sensitivities than a cyclonic conventional design. Comparatively speaking, limits of detection for alcohols were of the same order for the two evaluated detection systems (from 5 to 25 mg/L). In contrast, unlike RI, ICP-AES provided information about the content of both organic and inorganic species. Furthermore, temperature programming was applied to shorten the analysis time and it was verified that ICP-AES was less sensitive to temperature changes and modifications in the analyte chemical nature than the RI detector. Both detectors were successfully applied to the determination of short chain alcohols in several beverages such as muscatel, pacharan, punch, vermouth and two different brands of whiskeys (from 10 to 40 g of ethanol/100 g of sample). The results of the inorganic elements studied by HTLC-ICP-AES were compared with those obtained using inductively coupled plasma mass spectrometry (ICP-MS) obtaining good agreement between them. Recoveries found for spiked samples were close to 100% for both, inorganic elements (with both HLTC-ICP-AES and ICP-MS) and alcohols (with both HTLC-ICP-AES and HTLC-RI hyphenations).
Amanda Terol; Eduardo Paredes; Salvador E. Maestre; Soledad Prats; Jose Luis Todoli. Alcohol and metal determination in alcoholic beverages through high-temperature liquid-chromatography coupled to an inductively coupled plasma atomic emission spectrometer. Journal of Chromatography A 2011, 1218, 3439 -3446.
AMA StyleAmanda Terol, Eduardo Paredes, Salvador E. Maestre, Soledad Prats, Jose Luis Todoli. Alcohol and metal determination in alcoholic beverages through high-temperature liquid-chromatography coupled to an inductively coupled plasma atomic emission spectrometer. Journal of Chromatography A. 2011; 1218 (22):3439-3446.
Chicago/Turabian StyleAmanda Terol; Eduardo Paredes; Salvador E. Maestre; Soledad Prats; Jose Luis Todoli. 2011. "Alcohol and metal determination in alcoholic beverages through high-temperature liquid-chromatography coupled to an inductively coupled plasma atomic emission spectrometer." Journal of Chromatography A 1218, no. 22: 3439-3446.