Mr. Alin Cristian Nicolae Vintilă
National Institute for Research & Development in Chemistry and Petrochemistry, Bucharest, Bucureşti, Romania
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Academic Career Length
8Years (2019-Present)
(Calculated once Scilit publication data is synced: current year − year of first publication + 1)
Representative Publications
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Journal Article
APAnca Paulenco
Anca PaulencoAlin Cristian Nicolae Vintilă
Alexandru VlaicuMCMihaela Cîlțea-Udrescu
Mihaela Cîlțea-UdrescuA(Ana-Maria Surupaceanu (Galan)
Ana-Maria Surupaceanu (Galan)This paper focuses on a process for dairy wastewater treatment by mixotrophic cultivation of microalgae Nannochloris sp., using cheese whey obtained as a side flow from cheese production as an organic carbon source. The microalgae samples were prepared by adding to the standard growth medium increasing amounts of cheese whey, calculated to ensure a lactose concentration between 0 and 10 g/L. The samples were incubated at a constant temperature of 28 °C and 175 rpm stirring speed for a total time of seven days. Two LED (Light Emitting Diode) illumination schemes were applied in order to assess the effect of this parameter on microalgae development and bioactive compound accumulation: continuous illumination (light stress) versus alternative cycles of 12 h light—12 h dark (day–night cycle). The growth medium was analyzed before and after microalgae cultivation in order to determine the reduction of carbon, nitrogen, and phosphorus. The results obtained for this process, after a seven-day cultivation period, were as follows: reduction of 99–100% of lactose from the growth medium, up to 96% reduction in chemical oxygen demand, up to 91% reduction in nitrogen content, and up to 70% reduction in phosphorus content.
Journal Article
A(Ana-Maria Surupaceanu (Galan)
Ana-Maria Surupaceanu (Galan)Alexandru VlaicuAlin Cristian Nicolae VintilăMCMihaela Cîlțea-Udrescu
Mihaela Cîlțea-UdrescuGCGeorgiana Cerchezan
Georgiana CerchezanAPAnca Paulenco
Anca Paulenco +2
This paper has approached the study of dairy wastewater treatment and the simultaneous biocompound production by Porphyridium purpureum under continuous light and under a day–night cycle. The main goals were to achieve a reduction in the lactose content of the cheese wastewater that was tested and, at the same time, to obtain added value from the produced compounds, so as to increase the economic value of the process. The results show that biomass production increases proportionally with the concentration of lactose for both of the illumination options. The lactose concentration in the waste stream was reduced over 90% in just 7 days. The exopolysaccharide concentration in the growth medium increased with lactose availability. For the samples that were under constant light stress, the concentration of phycobiliproteins was highest when there was small amounts of lactose in the medium. The content of pigments was higher in the case of the day–night cycle of illumination; these being affected by stress factors such as continuous light and high lactose concentration. The results that were obtained prove that dairy wastewaters that are rich in lactose can be used efficiently for the growth of Porphyridium purpureum, achieving an increase in the biomass concentration and a large reduction of the lactose from this waste stream while obtaining a microalgae biomass that is rich in valuable compounds.
19 March 2022 in Journal of Food Measurement and Characterization
Journal Article
Alin Cristian Nicolae VintilăAVAlexandru Vlaicu
Alexandru Vlaicu
ERElena Radu
Elena Radu
MCMihaela Ciltea-Udrescu
Mihaela Ciltea-Udrescu
EEEmanuela Cristina Enascuta
Emanuela Cristina Enascuta
EOElena-Emilia Oprescu
Elena-Emilia Oprescu +1
1 November 2019 in FEMS Microbiology Letters
Journal Article
DCDiana Constantinescu-Aruxandei
Diana Constantinescu-Aruxandei
AVAlexandru Vlaicu
Alexandru Vlaicu
IMIoana Cristina Marinas
Ioana Cristina MarinasAlin Cristian Nicolae VintilăLDLuminița Dimitriu
Luminița Dimitriu
Florin OanceaThe aim of our study was to establish the effect of selenium and betaine on the growth of D. salina, accumulation of photosynthetic pigments and antioxidant activity of the hydrophobic fraction. This approach was an attempt to demonstrate ‘microalgae biostimulant’ effects, similar to ‘plant biostimulant’ effects, i.e. increased tolerance to abiotic stress and enhanced accumulation of bioactive compounds. A high-throughput assay was done in 24-well microplates, at 15% NaCl and different concentrations of sodium selenite (0, 0.5, 2 and 8 µM) or betaine (0, 5, 50 and 500 µM). Both selenium and betaine induced a slight delay in algae growth during the actively growing stage but the final density reached similar values to the control. Betaine significantly enhanced (50%–100%) carotenoids and chlorophyll a accumulation, in a concentration depending manner. Antioxidant activity increased almost 3-fold in extracts of algae treated with 50 µM betaine. Selenium had a much more discrete effect than betaine on pigments biosynthesis. The antioxidant activity of the extracts increased 2-fold in the presence of Se compared to the control. Our work proves that it is possible to enhance production and activity of bioactive compounds from microalgae by using ingredients, which already proved to act as plant biostimulants.
Journal Article
Alin Cristian Nicolae VintilăMVMircea Vinatoru
Mircea VinatoruA(Ana-Maria Surupaceanu (Galan)
Ana-Maria Surupaceanu (Galan)Alexandru VlaicuMCMihaela Cîlțea-Udrescu
Mihaela Cîlțea-UdrescuICIoan Calinescu
Ioan Calinescu +2
The influence of ultrasound irradiation on the algal biomass productivity as well as its oil content and fatty acids profile, grown in a modified Zarrouk medium, i.e., deproteinized whey waste solution, was investigated. The algal samples (Nannochloris sp. 424-1 microalgae) were grown for 7 days in a thermostated incubator at 28 °C, shaken under continuous light. During this period, the algal biomass was subjected to induced stress by ultrasonic irradiation at different powers and sonication time. The obtained results demonstrate that ultrasound stressing of algae biomass has a positive effect on both the quantity of biomass and the oil obtained, also causing a shift in fatty acid composition by increasing the proportion of C16 and C18 polyunsaturated fatty acids. A low dosage level of exposure to the ultrasound led to algal biomass increase as well as lipid accumulation. For both types of irradiation modes which were investigated, daily and only initial irradiation, the beneficial effect of the ultrasound decreases as the exposure time increases and the excessive sonication becomes detrimental to microalgae growth.
15 August 2019 in Revista de Chimie
Journal Article
IBIonut Banu
Ionut Banu
GBGrigore Bozga
Grigore Bozga
GBGheorghe Bumbac
Gheorghe Bumbac
Alin Cristian Nicolae VintilăSVSanda Velea
Sanda Velea
ACAugustin Constantin Crucean
Augustin Constantin Crucean
+3
The increased quantities of glycerol available on the market initiated research efforts oriented to new valorization technologies, particularly by its conversion into medium tonnage chemicals, replacing petroleum derivatives. In this work it was investigated the valorization of glycerol by its transformation in glycerol acetates, by direct esterification with acetic acid, over a commercial Amberlyst-35 resin. Experiments were carried out batch-wise, in an autoclave reactor under controlled working conditions, at temperatures between 95 and 112 oC and initial acetic acid to glycerol molar ratios between 4 and 9. The experimental data evidenced that the glycerol conversion to monoacetate is faster than the next esterification steps. A relatively simple kinetic model was proposed and its parameters were evaluated from the experimental measurements. It proved reasonable predicting capacity for products distribution dependencies on the reactants molar ratio and reaction temperature.
About Me
Alin Cristian Nicolae Vintilă is a Scientific Researcher 3rd degree at the National Institute for Research & Development in Chemistry and Petrochemistry – ICECHIM, Bucharest, Romania, and holds a PhD in Chemical Engineering. Working within the Alternative Bioresources and Biofuels research team, his research focuses on process intensification, heterogeneous catalysis, and the circular valorization of biomass and residual resources. His experience spans microwave and ultrasound treatments for enhanced microalgal cultivation, selective recovery of valuable biocompounds, development of supported iron catalysts for light olefin production through Fischer–Tropsch synthesis, and biological and thermochemical conversion of residual biomass.
Key Areas of Expertise: Microalgal cultivation and valorization of nutrient-rich residual streams; application of microwave and ultrasound treatments to enhance biomass growth and lipid accumulation; UAE and selective recovery of lipids, fatty acids, carotenoids, and other bioactive compounds; process optimization using RSM; preparation, activation, and testing of supported iron catalysts for C2–C4 olefin production through Fischer–Tropsch synthesis, including ultrasound-assisted impregnation and evaluation of support and promoter effects; pyrolysis of lignocellulosic biomass and solid digestate for biochar production; anaerobic digestion and co-digestion of microalgal biomass and organic residues for biogas production.