Changes in Functional Components and Antioxidant Activity during the Fermentation of Siraitia grosvenorii Pomace by Eurotium cristatum
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Abstract:
Siraitia grosvenorii pomace was fermented by Eurotium cristatum. Changes in the contents of total saponins, polyphenols, total flavones and crude polysaccharides and their correlations with the activities of β-glucosidase, cellulase, α-amylase and protease were analyzed. Meanwhile, the changes in antioxidant activity were examined during the fermentation process. The results showed that the contents of total saponins, polyphenols, total flavonoids and polysaccharides in the Siraitia grosvenorii pomace increased first and then decreased during the fermentation, reaching the maximum values of 11.36, 3.08, 10.42 and 8.34 mg/g on the 6th day, 8th day, 6th day and 6th day, respectively (which were 1.42 times, 2.37 times, 2.53 times, and 1.90 times that of the unfermented group). The activities of β-glucosidase, cellulase, α-amylase and protease reached the maximum values of 57.91, 153.06, 69.42 and 85.30 U/g on the 8th day, 6th day, 8th day and 8th day, respectively. The changes of total saponins, total flavonoids and crude polysaccharides were significantly positively correlated with cellulase activity and protease activity. The changes of the polyphenol content were significantly positively correlated with the activities of β-glucosidase, cellulase, α-amylase and protease. During the fermentation, the antioxidant activity of Siraitia grosvenorii pomace first increased and then decreased, and its DPPH free radical scavenging ability, ABTS free radical scavenging ability and total reducing power reached the maximum on the 8th day, 8th day and 6th day, respectively, which differed significantly from those of the unfermented group (P<0.05). Therefore, the fermentation of Siraitia grosvenorii pomace by Eurotium cristatum can effectively increase the contents of its functional components and enhance its antioxidant activity, which is of great significance for the green cycle and sustainable utilization of Siraitia grosvenorii pomace.
