Vigna angularis, also called adzuki bean, a member of the family Fabaceae, has long been cultivated in Asian countries. This legume has received considerable attention owing to the presence of polyphenols. The optimal extraction conditions for total polyphenols from V. angularis and their antioxidant activities were investigated in this study. Ultrasound-assisted extraction was used to optimize...

The aim of this work was to apply unconventional extraction methods including ultrasonication (US), high voltage electrical discharge (HVED) and pulsed electric field (PEF) to extract polyphenols from grape seeds and concentrate the extracts by ultrafiltration. A comparative evaluation of the three extraction methods for release of polyphenols from grape seeds was investigated. The results show...

The optimization of the extraction of natural antioxidants from white tea has fostered intensive research. This study has investigated the effects of ethanol-water mixtures, temperature and time on the extraction of polyphenols and antioxidant components from white tea. The response surface methodology was applied to identify the best extraction conditions. The best conditions to maximize the e...

Hot pressurized liquid extraction has been used to obtain polyphenols; however, its operating conditions can generate hydroxymethylfurfural, a potential human carcinogen. The addition of ethanol can reduce process temperatures and retain extraction efficiencies, but the ethanol may reduce the recovery of polyphenols in the subsequent purification stage, affecting the antioxidant properties of t...

Antioxidant activity and polyphenols were determined by Microwave assisted extraction technique (MAE) from nonedible parts of Indian tropical fruits. Antioxidant activity was performed using FRAP, ABTS and DPPH assays. Nine polyphenols were quantified by LC-MS/MS. Results showed that skin extract of A. comosus contained highest value for all antioxidant assays. Polyphenolic compounds were found...

The aim of this study was evaluate the potential use of low-cost and environment friendly solvents to extract polyphenols from apple wastes for biotechnological application. Apples solid wastes from industrial transformation were used as raw material to produce extracts enriched in antioxidant polyphenols, using a green and environmental friendly solvent in a solid-liquid extraction. The reacti...

Wastes generated from the processing of some fruits still contain large amounts of chemical components such as polyphenols, which are deemed as very effective antioxidants.This study involves the characterization of wastes generation by pink guava processing and selection of the best solvent that will allow us to extract the excess polyphenols via ultra-filtration membran...

Abstract: Extraction efficiency of extraction methods on the content of polyphenols (catechins and gallic acid) and alkaloids (caffeine, theobromine and theophylline) from tea leaves is studied. Level of polyphenols and alkaloids in samples (leaf buds, young leaves, old leaves and Sabah black Tea) from Sabah Tea Plantation were evaluated by HPLC. Leaf buds were found to have a higher polyphenol...