Proanthocyanidins are supposed to have some therapeutical properties as antioxidants and antineoplasics. Most of the proanthocyanidins, however, not commercialized since their separation from natural sources is either very expensive or well-known. In this work, feasibility application mixtures carbon dioxide alcohol under supercritical conditions for selective extraction phenolic compounds grape seeds has been studied, among them low polymerized main monomer units, (+)-catechin...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSwelling equilibria for weakly ionizable, temperature-sensitive hydrogelsSagrario Beltran, John P. Baker, Herbert H. Hooper, Harvey W. Blanch, and M. PrausnitzCite this: Macromolecules 1991, 24, 2, 549–551Publication Date (Print):January 1, 1991Publication History Published online1 May 2002Published inissue 1 January 1991https://pubs.acs.org/doi/10.1021/ma00002a032https://doi.org/10.1021/ma00002a032research-articleACS PublicationsRequest reuse...

Brewer's spent grain (BSG) was chemically characterized obtaining 52.1% of carbohydrates, 17.8% protein, 5.9% lipids, 13.5% insoluble lignin and 24.3% water-soluble extractives. This work has been focused on the study polyphenol extraction extractive fraction by water ultrasound-assisted extraction. Selected conditions were 47 °C 21.7 mL water/gdry-BSG. The effect solvent polarity studied using ethanol aqueous mixtures, from 20% to 100% ethanol. kinetics have fitted power law Weibull models...

The valorization of onion skin wastes (OSW) through the extraction, identification, and quantification phenolic compounds was studied in this work, using subcritical water a semicontinuous extractor (2.5 mL/min; 105–180 °C; 5 MPa). extraction flavonoids resulted to be fast (<30 min) temperature sensitive (maximum at 145 total flavonoids, 27.4 ± 0.9 mg/g dry OSW (DOSW)). experimental results were fitted Weibull model. influence solvent properties on found critical. A precipitate formed...

Packaging is a crucial tool for reducing food waste and enhancing product competitiveness. Fossil fuel-based plastics, mostly used packaging, account nearly 40% of global plastic waste. To address this issue, study developed layer-by-layer casting technique to create novel bilayered composites with distinct agar/chitosan PVA/agar layers. Film's properties, such as thickness, plasticity, tensile strength, were affected by adjusting the volume The elongation at break was positively related...

A systematic kinetic study was conducted in subcritical water medium the temperature range from 150 to 200 °C for pure glucose, xylose, proline and aspartic acid as well binary mixtures of sugars + amino acids understand reaction kinetics interactions among biomass components discern influence Maillard (MR) on overall kinetics. The main degradation products identified glucose xylose were respective dehydration products, hydroxymethyl furfural furfural, yielding an increasing solid residue...

The esterification kinetics of lactic acid with methanol without addition catalyst and catalyzed by ion-exchange resins are presented in this work. effect type, stirrer speed, size, loading, initial reactant ratio, temperature on reaction was evaluated. Experimental rates were correlated some models based homogeneous heterogeneous (dual- single-site mechanisms) approaches. Nonideality the liquid phase taken into account using activities instead mole fractions. Prediction activity...

The valorization of the brewer's spent grain (BSG) generated in a craft beer industry was studied by subcritical water hydrolysis semi-continuous fixed-bed reactor. Temperature varied from 125 to 185 °C at constant flow rate 4 mL/min. Biomass yielded maximum 78% solubilized protein °C. Free amino acids presented level 160 with value 55 mg free acids/gprotein-BSG. Polar acid lower temperatures than non-polar acids. total phenolic compounds reached This is same for aldehyde such as vanillin,...

The semi-continuous hydrolysis of onion skin wastes (OSW) using subcritical water (SubW; working conditions: 105–180 °C; 5 MPa; 2.5 mL/min) has been studied in this work. Liquids after showed a sharp increase total organic carbon (>30 mg/g OSW) at temperatures above 145 °C, when SubW began to promote the partial structural components OSW. Among them, pectin was one main recovered (extraction yield up 9% °C), whereas cellulose barely hydrolyzed range studied. composition demonstrated that...

The feasibility of an industrial-scale subcritical water (SW) system by scaling up from laboratory to pilot scale in a discontinuous operation mode has been investigated regarding the valorization brewer´s spent grain (BSG). treatment (SWT) BSG at 170 °C and 22 min, resulted release 56% total carbohydrates present BSG. A pentose yield 78% was achieved (18% as monomer 82% oligomer). concentration inhibitors hydrolysate relatively low, 0.22 g/L, 0.31 0.13 g/L furfural acetic formic acids...

The hydrolysis of the water-soluble protein (WSP) fraction from tuna fish meal was evaluated by subcritical water (subW) using N2 and CO2 as different pressurization agents in temperature range 140 to 180 °C. For both gases, amino group release increased increasing working while Lowry response decreased due production smaller-size peptides free acids. acid content higher with than N2. At °C, 344 ± 5 275 3 mg acids per g WSP were released, respectively; although, systems smallest molecular...

This study investigated the valorization of low-valued Yellowfish (Labeobarbus nedgia) (LB) muscle into valuable protein hydrolysates using three commercial enzymes (Alcalase®, Novozym®, and Protease®). After testing different enzyme concentrations (0-3%, v/w) temperatures (50-70 °C), best results, including highest degree hydrolysis (DH) antioxidant activity, were achieved when Alcalase® at 3% (v/w) a temperature 60 °C. However, Novozym® was found to be more resistant high than Alcalase®....