Fig. 2.

Total amounts of phenols (A), flavonoids (B), flavanols (C), hydroxycinnamic acids (D), anthocyanins (E) reducing sugars (F), antioxidant activity (G) and specific bioactive compounds (H) detected in selected solvent-based (SE) extracts. Results are expressed as g of standard compound equivalent per kg of pomace dry weight (g eq/kgDW). Different letters indicate a statistically significant difference (oneway ANOVA followed by a post hoc two-tailed Student’s t-test, p < 0.05) between the same type of data. Data are the mean ± SD (n = 2). AA, ascorbic acid; AcN, acetonitrile; CAT, catechin; cPIC, cis-piceid; EC, epicatechin; ECG epicatechin gallate; EGC, epigallocatechin; EtOH, ethanol; FA, ferulic acid; GA, gallic acid; GLUC, glucose; MALV, malvidin; PROTA, protocatechuic acid; QUERC, quercetin; RUT, rutin; SYRA, syringic acid; VANA, vanillic acid.