Abstract

The goal of this study was to investigate the physicochemical characteristics of Platycodon grandiflorum flower extracts obtained with different ratios of edible ethanol containing water solutions (10%, 30% and 60% ethanol). The redness and pH values of the extracts increased with increasing ethanol content, whereas the acidity decreased. The total phenol, total flavonoid, and total anthocyanin contents were in the ranges of 105.94-113.79 µg/mL, 11.97-27.13 µg/mL, and 0.01-0.13 µg/mL, respectively, all of which were significantly high and decreased in the order of 60% > 30% > 10% ethanol. The antioxidant activity and cholesterol adsorption activity generally followed the order of 60% > 10% > 30% ethanol, and the α-glucosidase inhibitory activity was significantly higher in the 10% ethanol extract, followed by the 30% > 60% ethanol extract. However, there was no identifiable significant difference in the xanthine oxidase inhibitory activities obtained using the different ethanol addition ratios when the sample concentration was 5 µg/mL. The physiological activities of the ethanol extracts of P. grandiflorum flowers are estimated to be affected by other functional components besides polyphenol compounds and anthocyanins because they were inconsistent with the trends of the total phenol, flavonoid, and anthocyanin contents.

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