Furthermore, the order of ABTS activity of FSPs has a positive correlation with the order of soybean content in the six FSPs. We observed a negative correlation between isoflavone aglycon contents and 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulphonic acid) (ABTS) activity. Antioxidant activity and physicochemical properties were determined to examine the relationships between the FSPs and their antioxidant activities. Amino acid contents were relatively higher in NT and CG, sugar and sugar alcohol contents were relatively higher in MS and TM, isoflavone glycoside contents were relatively highest in CG, isoflavone aglycon contents were the highest in DJ, and soyasaponin contents were the highest in CG. Six FSPs could be clearly distinguished by principle component analysis (PCA) and partial least square-discriminant analysis (PLS-DA). To evaluate the quality of various FSPs in East Asia, non-targeted metabolite profiling with multivariate analysis of six traditional FSPs (Natto NT, Cheonggukjang CG, Doenjang DJ, Miso MS, Doubanjiang DB, Tianmianjiang TM) was performed. Many ethnic fermented soybean products (FSPs) have long been consumed as seasoning and protein sources in East Asia.
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