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Proanthocyanidins (PCs) with poor bioavailability were argued for their health benefits. In this study, water-soluble polymeric polyphenolic PCs fractions from Pyracanthafortuneana fruit were used to investigate whether the presence of PCs is correlated with the increased cell antioxidant activities (CAA) of quercetin (Q). The results indicated that the most decrement in the values of EC50, which Q inhibited peroxyl radical-induced DCFH oxidation effective in the HepG2 cells, was observed to be 2.91 (vs. control 5.97) in the present of the fraction with 15.8 of the average degree of polymerisation of PCs (ADP). Also, the order of efficacy was the same with the ADP of PCs. Further, this effect is associated with the improvement of the solubility and stability of Q after the addition of the PCs. Our current study suggests that the additive effects of PCs on small molecular polyphenols may be responsible for their antioxidant benefits in vivo., (Copyright © 2014 Elsevier Ltd. All rights reserved.)

Pyracantha fortuneana fruit is a potential source of nutraceutical and therapeutic agents. We investigated the effects of P .  fortuneana fruit extract (PFE) on hyperlipidaemia, obesity, and oxidative stress in rodents. PFE significantly decreased body weight, triacylglycerol, total cholesterol, low-density lipoprotein-cholesterol, and malondialdehyde levels. By contrast, PFE elevated high-density lipoprotein-cholesterol levels, glutathione peroxidase, and superoxide dismutase activities in both preventive and therapeutic rodent groups. These results indicate that the amelioration of PFE on hyperlipidaemia and obesity was highly associated with the improvement of endogenous antioxidant activity. Polyphenols and saponins were quantified by spectrophotometric and HPLC methods. Several new saponin compounds were identified by liquid chromatography and tandem mass spectrometry as ursolic acid (UA) derivatives. The quercetin, rutin, and procyanidin treatments in HepG2 cells showed increases in low-density lipoprotein receptor activity and apolipoprotein-A1, but UA less affected these protein activities. Therefore, PFE could be promising in ameliorating chronic metabolic diseases via multiple constituent synergies. [ABSTRACT FROM AUTHOR]

Abstract: Optimized solid–liquid extraction conditions by response surface methodology (RSM) and optimal solvent selectivity liquid–liquid fractionation by mixture design were studied for process of Pyracantha fortuneana fruits (PFF) healthy products. A combination of total polyphenolic content (TPC), total antioxidant activity (TAA) and chromatographic profiling was used to evaluate the optimization. RSM results were ethanol concentration, 71%; extraction temperature, 51°C; and pH solution, 3.2. The mixture design indicated that the fraction with the highest TAA and TPC was directed to ethyl-acetate phase. The fractions of water-soluble and n-butylalcohol-soluble were rich in TAA and TPC compared with the starting row of PFF. Twenty-seven polyphenols were detected in chromatographic profilings, most of which were reported for the first time in this study. The improvements of accessibility in the optimized fractions suggest their flexible applicabilities for nutraceutical food industries. This study may be crucial approach for all similar natural functional product optimization. [Copyright &y& Elsevier]