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Effects of ultrasound treatment and concentration of ethanol on selectivity of phenolic extraction from apple pomace
Author(s) -
Wang Lu,
Boussetta Nadia,
Lebovka Nikolai,
Vorobiev Eugene
Publication year - 2018
Publication title -
international journal of food science and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.831
H-Index - 96
eISSN - 1365-2621
pISSN - 0950-5423
DOI - 10.1111/ijfs.13835
Subject(s) - catechin , pomace , polyphenol , extraction (chemistry) , chemistry , chromatography , ethanol , food science , organic chemistry , antioxidant
Summary The extraction of polyphenols from apple pomace was studied using ultrasound, ethanol/water mixtures and moderate temperatures, 20–37 °C. The extraction kinetics and extraction yields of catechin and total phenolic content ( TPC ) were evaluated at different times of ultrasound treatment ( t u ) and concentrations of ethanol ( C e ). The highest extraction efficiency of TPC was observed at t u = 30 min, C e = 50% and total extraction time of t e = 60 min. The high selectivity of catechin extraction was demonstrated by analysing the relative content of catechin ( R = C c / TPC ) in dependence of applied extraction protocol. The initial portions of extracts at small levels of TPC (≤50 mg per 100 DM ) were richer in catechin content ( R ≈ 15%–31%), whereas the last portions of extracts with high level of TPS were more exhausted in catechin ( R ≈ 2%).