Anthocyanins profile, total phenolics and antioxidant activity of black currant ethanolic extracts as influenced by genotype and ethanol concentration.Food Chem. 2013 Nov 15; 141(2):961-6.FC
Ethanolic extracts prepared from the fruits of three cultivars of black currant ('Record', 'Blackdown' and 'Ronix') macerated in three concentrations (40%, 60% and 96%) of aqueous ethanol were investigated for their anthocyanins profile, total phenolics and antioxidant activity. Nine individual anthocyanins were detected and quantified by using HPLC-MS in ethanolic extracts of black currants, i.e. delphinidin 3-glucoside, delphinidin 3-rutinoside, cyanidin 3-glucoside, cyanidin 3-rutinoside, petunidin 3-rutinoside, pelargonidin 3-rutinoside, peonidin 3-rutinoside, petunidin 3-(6-coumaroyl)-glucoside and cyanidin 3-(6-coumaroyl)-glucoside. The antioxidant activity of the alcoholic extracts was investigated by the 2,2'-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging method while the total phenolic content was determined by using the Folin-Ciocalteu assay. The highest anthocyanins content was found in the extracts made in 60% ethanol while total phenolics content was highest at 96% ethanol concentration. The extraction yield of individual anthocyanins was differently influenced by the rise of the ethanolic concentration. Maximum extraction yield of most individual anthocyanins was reached at 60% ethanol concentration except the 3-(6-coumaroyl)-glucoside of cyanidin and petunidin whose maximum extraction occurred at 96% ethanol concentration.