Glycerol as Alternative Co-Solvent for Water Extraction of Polyphenols from Carmenere Pomace: Hot Pressurized Liquid Extraction and Computational Chemistry Calculations.

ABSTRACT: Glycerol is a co-solvent for water extraction that has been shown to be highly effective for obtaining polyphenol extracts under atmospheric conditions. However, its efficacy under subcritical conditions has not yet been studied. We assessed different water-glycerol mixtures (15%, 32.5%, and 50%) in a hot pressurized liquid extraction system (HPLE: 10 MPa) at 90 °C, 120 °C, and 150 °C to obtain extracts of low molecular weight polyphenols from Carménère grape pomace. Under the same extraction conditions, glycerol as a co-solvent achieved significantly higher yields in polyphenols than ethanol. Optimal extraction conditions were 150 °C, with 32.5% glycerol for flavonols and 50% for flavanols, stilbenes, and phenolic acids. Considering gallic acid as a model molecule, computational chemistry

SUBMITTER: Huaman-Castilla NL 

PROVIDER: S-EPMC7175273 | biostudies-literature | 2020 Mar

REPOSITORIES: biostudies-literature