Abstract
The purpose of this study was to investigate the quality characteristics, antioxidant and skin-whitening activity of Glycyrrhiza uralensis extract cultivated for different periods. The physicochemical components such as pH, total acid, reducing sugar, and content of potent functional components (glycyrrhizin, glabridin, liquiritin, liquiritigenin and glycyrrhisoflavone) and the tyrosinase inhibitory activity were investigated. Also, the antioxidant activities such as DPPH, ABTS, and total phenolic and total flavonoid content were measured. The total phenolic and flavonoid contents were observed to be the highest in the 1-year-old (K1) sample group, and showed values of 18.32% and 6.94%, respectively. The 3-year-old (K3) sample showed the highest content of glycyrrhizin at 163.65 ㎎/100 g. Compared to the other samples, the K1 sample had a superior content of glabridin, liquiritin, liquiritigenin, and glycyrrhisoflavone. The K1 sample also showed the highest skin-whitening activity of 54.68±1.23%. Therefore, it was concluded that the K1 sample has good antioxidant and skin-whitening activity and thus has the potential not only as a food material but also as a cosmetic material and various industrial uses.
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