Characterization of saponins and phenolic compounds: antioxidant activity and inhibitory effects on α-glucosidase in different varieties of colored quinoa (Chenopodium quinoa Willd). Issue 11 (2nd November 2019)

• Record Type: Journal Article
• Authors: Han, Yameng; Chi, Jianwei; Zhang, Mingwei; Zhang, Ruifen; Fan, Sanhong; Huang, Fei; Xue, Kaming; Liu, Lei
• Is Part Of: Bioscience, biotechnology, and biochemistry. Volume 83:Issue 11(2019)
• Page Start: 2128
• Page End: 2139
• Publication Date: 2019-11-02
• Subjects: Colored quinoa -- saponins -- phenolics -- antioxidant activity -- α-glucosidase; Biotechnology -- Periodicals; Biochemistry -- Periodicals; 660.6
• DOI: 10.1080/09168451.2019.1638756
• Languages: English
• ISSNs: 0916-8451

Abstract

ABSTRACT: This study investigated the contents of saponins and phenolic compounds in relation to their antioxidant activity and α-glucosidase inhibition activity of 7 colored quinoa varieties. The total saponin content was significantly different among 7 varieties and ranged from 7.51 to 12.12 mg OAE/g DW. Darker quinoa had a higher content of phenolic compounds, as well as higher flavonoids and antioxidant activity than that of light varieties. Nine individual phenolic compounds were detected in free and bound form, with gallic acid and ferulic acid representing the major compounds. The free and bound phenolic compounds (gallic acid and ferulic acid in particular) exhibited high linear correlation with their corresponding antioxidant values. In addition, the free phenolic extracts from colored quinoa exhibited higher inhibitory activity against α-glucosidase than the bound phenolic extracts. These findings imply that colored quinoa with abundant bioactive phytochemicals could be an important natural source for preparing functional food. Graphical abstract: : characterization of saponins and phenolic compounds: antioxidant activity and inhibitory effects on α-glucosidase in different varieties of colored quinoa