Violeta Alexandra Ion

Dr. Violeta Alexandra Ion

University of Agronomic Sciences and Veterinary Medicine of Bucharest
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orcid

Research Focus & Metrics

Academic Career Length

6Years (2021-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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16 November 2021 in Foods
Verified
Journal Article
Open access
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AMAmalia Carmen Miteluţ
Amalia Carmen Miteluţ
Elena PopaElena Popa
Elena Popa
MDMihaela Draghici
Mihaela Draghici
PPPaul Alexandru Popescu
Paul Alexandru Popescu
VPVlad Ioan Popa
Vlad Ioan Popa
Mona Elena PopaMona Elena Popa
Mona Elena Popa
The food industry nowadays is facing new challenges in terms of sustainability and health implications of packaging and processing techniques. Due to their desire for new and natural products coupled with changes in lifestyle, consumers are looking for food products that have been less processed but possess longer shelf life and maintain nutritional and sensorial proprieties during storage. These requirements represent real challenges when dealing with highly perishable food products, such as fruits and vegetables. Thus, in recent years, edible coatings have been intensively developed and studied because of their capacity to improve the quality, shelf life, safety, and functionality of the treated products. Edible coatings can be applied through different techniques, like dipping, spraying, or coating, in order to control moisture transfer, gas exchange, or oxidative processes. Furthermore, some functional ingredients can be incorporated into an edible matrix and applied on the surface of foods, thus enhancing safety or even nutritional and sensory attributes. In the case of coated fruits and vegetables, their quality parameters, such as color, firmness, microbial load, decay ratio, weight loss, sensorial attributes, and nutritional parameters, which are very specific to the type of products and their storage conditions, should be carefully monitored. This review attempts to summarize recent studies of different edible coatings (polysaccharides, proteins, lipids, and composites) as carriers of functional ingredients (antimicrobials, texture enhancers, and nutraceuticals) applied on different minimally processed fruits and vegetables, highlighting the coating ingredients, the application methods and the effects on food shelf life and quality.

31 July 2022 in Agronomy
Verified
Journal Article
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SCSuzana Ioana Calcan
Suzana Ioana Calcan
Oana Cristina ParvulescuOana Cristina Parvulescu
Oana Cristina Parvulescu
VIVioleta Alexandra Ion
Violeta Alexandra Ion
CRCristian Eugen Raducanu
Cristian Eugen Raducanu
LBLiliana Badulescu
Liliana Badulescu
UBUniversity of Agronomic Sciences and Veterinary Medicine of Bucharest
University of Agronomic Sciences and Veterinary Medicine of Bucharest
The paper aimed at evaluating the effects of biochar (BC) produced by slow pyrolysis of vine pruning residue on soil physicochemical properties and tomato plant growth. A greenhouse experiment was conducted for 66 days, applying different treatments for 3 soil types, i.e., foliar fertilizer, BC (at a volumetric ratio between BC and soil of 20/80), BC + foliar fertilizer, and no treatments. Strongly alkaline BC (pH = 9.89 ± 0.01) had a significant beneficial effect on the growth performance of tomato plants sown in a strongly acidic soil (pH = 5.40 ± 0.02). The mean values of height, number of leaves, and collar diameter of plants grown in BC-amended soil without foliar treatment were up to 50% higher than those of plants grown in soil with the other treatments. This positive effect of BC on plant growth is due to the changes in the soil properties. The addition of BC led to increased values of electrical conductivity, pH, soluble and available nutrient concentration. Moreover, BC reduced soil bulk density by about 50%, resulting in improved plant root development and thus enhanced water and nutrient uptake. Accordingly, BC derived from vine pruning residues can improve soil quality and tomato plant growth, as well as reduce biomass residues.

16 August 2024 in Foods
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Journal Article
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LSLoredana Stanca
Loredana Stanca
LBLiviu Bilteanu
Liviu Bilteanu
OBOana Bujor
Oana Bujor
VIVioleta Alexandra Ion
Violeta Alexandra Ion
APAndrei Cătălin Petre Andrei Cătălin Petre
Andrei Cătălin Petre Andrei Cătălin Petre
Mărgărita Oana GhimpeteanuMărgărita Oana Ghimpeteanu
Mărgărita Oana Ghimpeteanu
Developing of functional foods is a promising strategy to reduce the increasing burden of colorectal cancer worldwide. Fruit pomace, particularly polyphenol and anthocyanin-rich chokeberry and blueberry, is a valuable ingredient for functional foods and nutraceuticals. Our study aimed to evaluate the anti-inflammatory and antiproliferative effects of chokeberry and blueberry pomace extracts on C2BBe1 colorectal carcinoma cells and explore the underlying signaling pathways. We analyzed both pomace extracts for total polyphenols and anthocyanins using Folin-Ciocalteu method and ultra-performance liquid chromatography, while antioxidative activity was assessed via the 2,2-diphenyl-1-picrylhydrazyl radical scavenging method. We evaluated the in vitro anti-inflammatory and antiproliferative effects using trypan blue exclusion, MTT and LDH assays, and assessed protein levels of p-Erk1/2, Akt-1, STAT1, STAT3, occludin, oxidized proteins, and MDA-protein adducts through western blotting, as well as analysis of a 37-plex panel of inflammatory markers. Chokeberry extracts exhibited higher total polyphenol content, anthocyanin levels, and antioxidative activity compared to blueberry extracts, however, blueberry extracts effects on cell viability and proliferation in C2BBe1 cells were stronger. Both fruit pomaces induced non-inflammatory cell death characterized by membrane integrity loss, beneficial in cancer therapy. Our data suggests chokeberry’s cytotoxicity may be mediated by Erk signaling and Akt-1 inhibition, while blueberry uniquely decreased occludin levels. These berries pomaces’ potential to mitigate cancer risks and enhance treatment efficacy is promising, warranting further investigation for functional foods development.

3 November 2022 in Agronomy
Verified
Journal Article
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DEDiana Egri
Diana Egri
Oana Cristina ParvulescuOana Cristina Parvulescu
Oana Cristina Parvulescu
VIVioleta Alexandra Ion
Violeta Alexandra Ion
CRCristian Eugen Raducanu
Cristian Eugen Raducanu
SCSuzana Ioana Calcan
Suzana Ioana Calcan
MCMihaela Emanuela Crăciun
Mihaela Emanuela Crăciun
The agronomic benefits of biochar (BC) prepared by slow pyrolysis of vine pruning residues, which are produced in large quantities in Romania, were evaluated. Three soil types, i.e., slightly alkaline fluvisol (S1), slightly acidic chernozem (S2), and strongly acidic luvisol (S3), with mean values of pH of 7.99, 6.26, and 5.40, were amended with BC at a volumetric ratio between BC and soil of 20/80. A greenhouse experiment was performed for 109 days to assess the effects of BC amendment on bell pepper growth. The following treatments were applied: foliar fertilizer, BC, BC + foliar fertilizer (using two concentrations of foliar fertilizer solution), and a control. Strongly alkaline BC (pH of 9.89 ± 0.01) had a significant positive effect on the growth performance of bell pepper plants sown in the strongly acidic soil S3. The mean values of height, collar diameter, number of leaves, and root volume of plants grown in BC-amended soil S3 without foliar treatment were significantly higher (13–72% and 14–33%, respectively) than those of plants grown in non-amended soil S3 without and with foliar treatment. This beneficial effect of BC on bell pepper plant growth was due to the changes in the soil properties. BC significantly increased (up to eight times) electrical conductivity, pH, soluble phosphorus, potassium, and ammonium nitrogen concentrations of soil S3, and decreased its bulk density by 51%, resulting in improved water/nutrient uptake and plant growth performance. BC had no favourable effect on the growth parameters of bell pepper plants sown in slightly alkaline soil S1, and slightly acidic soil S2.

11 February 2025 in Foods
Verified
Journal Article
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NDNicoleta Defta
Nicoleta Defta
ASAndreea Stan
Andreea Stan
VIVioleta Alexandra Ion
Violeta Alexandra Ion
EPElena Narcisa Pogurschi
Elena Narcisa Pogurschi
AOAurelia Osman
Aurelia Osman
LBLiliana Badulescu
Liliana Badulescu
In the context of economic crises and inflationary pressures, consumers often rely on discounted food products to manage their monthly budgets. This study aims to explore how socio-demographic factors are associated with Romanian consumers’ perception of food promotions. Data were collected from 1060 respondents, and the analysis was conducted using R version 4.4.2, applying both descriptive and inferential statistical methods, including Pearson’s chi-square test and multinomial logistic regression. The Pearson’s chi-square test revealed significant differences in consumer responses based on all socio-demographic factors examined, except for residence. Males, married individuals, those with higher education, and higher net incomes were generally more cautious about promotions, while younger consumers (aged 18–24) showed greater receptiveness. The multinomial logistic regression further identified significant predictors and estimated their impact on consumers’ perception of food promotions. We found that gender, marital status, education level, and age were strong predictors, while income had only a quadratic impact, and residence showed no statistically significant outcome. These findings offer valuable insights for shaping marketing strategies and highlight the role of socio-demographic factors in shaping consumer perceptions toward food promotions.

24 December 2021 in Processes
Verified
Journal Article
Open access
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SCSuzana Ioana Calcan
Suzana Ioana Calcan
Oana Cristina ParvulescuOana Cristina Parvulescu
Oana Cristina Parvulescu
VIVioleta Alexandra Ion
Violeta Alexandra Ion
CRCristian Eugen Raducanu
Cristian Eugen Raducanu
LBLiliana Badulescu
Liliana Badulescu
MCMihaela Emanuela Crăciun
Mihaela Emanuela Crăciun
The paper aimed at studying the slow pyrolysis of vine pruning waste in a fixed bed reactor and characterizing the pyrolysis products. Pyrolysis experiments were conducted for 60 min, using CO2 as a carrier gas and oxidizing agent. The distribution of biochar and bio-oil was dependent on variations in heat flux (4244–5777 W/m2), CO2 superficial velocity (0.004–0.008 m/s), and mean size of vegetal material (0.007–0.011 m). Relationships among these factors and process performances in terms of yields of biochar (0.286–0.328) and bio-oil (0.260–0.350), expressed as ratio between the final mass of pyrolysis product and initial mass of vegetal material, and final value of fixed bed temperature (401.1–486.5 °C) were established using a 23 factorial design. Proximate and ultimate analyses, FT-IR and SEM analyses, measurements of bulk density (0.112 ± 0.001 g/cm3), electrical conductivity (0.55 ± 0.03 dS/m), pH (10.35 ± 0.06), and water holding capacity (58.99 ± 14.51%) were performed for biochar. Water content (33.2 ± 1.27%), density (1.027 ± 0.014 g/cm3), pH (3.34 ± 0.02), refractive index (1.3553 ± 0.0027), and iodine value (87.98 ± 4.38 g I2/100 g bio-oil) were measured for bio-oil. Moreover, chemical composition of bio-oil was evaluated using GC-MS analysis, with 27 organic compounds being identified.