Extraction, identification and antioxidant activity of proanthocyanidins from Larix gmelinii Bark

This study was intended to extract and identify the proanthocyanidins from Larix gmelinii bark. Different extraction methods and degreasing methods were investigated. The content of proanthocyanidins, antioxidant activities and FT-IR analysis were used to evaluate and identify these extracts. The ultrasonic-assisted extracts displayed a higher content of proanthocyanidins and antioxidant activity than supercritical carbon dioxide extracts. The defatted extracts displayed a higher content of proanthocyanidins and antioxidant activity than un-defatted extracts. DPPH radical-scavenging capacity of extracts (29.88 μg mL− 1) was higher than VC (36.04 μg mL− 1), and the inhibition effect of lipid peroxidation of extracts (15%) was higher than VC (13%) and VE (11%). The FT-IR analysis revealed that the main phenolic compounds were almost the same as proanthocyanidin standards.