Extraction, identification and antioxidant activity of proanthocyanidins from <i>Larix gmelinii</i> Bark

<div><p>This study was intended to extract and identify the proanthocyanidins from <i>Larix gmelinii</i> 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<sup>− 1</sup>) was higher than <i>V</i><sub>C</sub> (36.04 μg mL<sup>− 1</sup>), and the inhibition effect of lipid peroxidation of extracts (15%) was higher than <i>V</i><sub>C</sub> (13%) and <i>V</i><sub>E</sub> (11%). The FT-IR analysis revealed that the main phenolic compounds were almost the same as proanthocyanidin standards.</p></div>

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