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Effects of Bacterial Fermentation on the Biochemical Constituents and Antioxidant Potential of Fermented and Unfermented Soybeans Using Probiotic Bacillus subtilis (KCTC 13241)

1
School of Applied Biosciences, Kyungpook National University, Daegu 41566, Korea
2
Institute of International Research & Development, Kyungpook National University, Daegu 41566, Korea
3
Department of Agronomy, University of Agriculture Faisalabad, Faisalabad 38040, Pakistan
*
Author to whom correspondence should be addressed.
Molecules 2017, 22(12), 2200; https://doi.org/10.3390/molecules22122200
Received: 16 November 2017 / Revised: 5 December 2017 / Accepted: 6 December 2017 / Published: 11 December 2017
Fermented soybeans, cheonggukjang (CKJ), are considered to be more wholesome than soybeans in Korea. To select the best soybean cultivar for making functional CKJ, a comparison was made between the biological activities of four soybean cultivars in their unfermented soybean (UFS) and CKJ states. Changes in 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical-scavenging activity, 2,2′-azino-bis (3-ethylbenzothiazoline-6-sulphonic acid) (ABTS) assays, superoxide dismutase (SOD)-like activity, total phenolic compounds, total amino acids, and isoflavones were investigated. The levels of DPPH, ABTS, SOD-like activity, and total phenolic compounds increased in CKJ among all cultivars. The isoflavone aglycone and total amino acids showed the highest amount in CKJ prepared from soybean cultivar Aga 3. These results suggest that the improved antioxidant activity of CKJ in all cultivars might occur because of the higher levels of aglycones and total phenolic compounds achieved during fermentation. Moreover, CKJ prepared from soybean cultivar Aga 3 showed higher antioxidant activity than the other cultivars and so can be considered for the commercial production of functional foods in the future. View Full-Text
Keywords: soybean; isoflavones; phenolic contents; antioxidant activity; cheonggukjang soybean; isoflavones; phenolic contents; antioxidant activity; cheonggukjang
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Ali, M.W.; Kim, I.-D.; Bilal, S.; Shahzad, R.; Saeed, M.T.; Adhikari, B.; Nabi, R.B.S.; Kyo, J.R.; Shin, D.-H. Effects of Bacterial Fermentation on the Biochemical Constituents and Antioxidant Potential of Fermented and Unfermented Soybeans Using Probiotic Bacillus subtilis (KCTC 13241). Molecules 2017, 22, 2200.

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