Abstract
Soybean whey is a high-yield but low-utilization agricultural by-product in China. In this study, soybean whey was used as a substrate of fermentation by Lacticaseibacillus plantarum 70810 strains. An exopolysaccharide (LPEPS-1) was isolated from soybean whey fermentation by L. plantarum 70810 and purified by ion-exchange chromatography. Its preliminary structural characteristics and antioxidant activity were investigated. Results show that LPEPS-1 was composed of mannose, glucose, and galactose with molar ratios of 1.49:1.67:1.00. The chemical structure of LPEPS-1 consisted of →4)-α-D-Glcp-(1→, →3)-α-D-Galp-(1→ and →2)-α-D-Manp-(1→. Scanning electron microscopy (SEM) revealed that LPEPS-1 had a relatively rough surface. In addition, LPPES-1 exhibited strong scavenging activity against DPPH and superoxide radicals and chelating ability on ferrous ion. This study demonstrated that soybean whey was a feasible fermentation substrate for the production of polysaccharide from L. plantarum 70810 and that the polysaccharide could be used as a promising ingredient for health-beneficial functional foods.
Highlights
Lacticaseibacillus are the largest genus of lactic acid bacteria (LAB), and more than 50 different species of LAB belong to the genus Lacticaseibacillus
Study has shown that L. plantarum are safe and can produce by fermentation a variety of secondary metabolites that are beneficial to human health, such as lactic acid, acetic acid, exopolysaccharide, specific proteases, and bacteriocins [5]
One purified EPS fraction (LPEPS-1) was extracted from soybean whey fermented by L. plantarum 70810, and the structural characteristics and antioxidant activity of LPEPS-1 were investigated
Summary
Lacticaseibacillus are the largest genus of lactic acid bacteria (LAB), and more than 50 different species of LAB belong to the genus Lacticaseibacillus. The Lacticaseibacillus mainly exist in the human gut and traditional fermented foods [1]. People have isolated different Lacticaseibacillus plantarum from Kimchi, fermented fish, and fermented drinks [2,3,4]. Study has shown that L. plantarum are safe and can produce by fermentation a variety of secondary metabolites that are beneficial to human health, such as lactic acid, acetic acid, exopolysaccharide, specific proteases, and bacteriocins [5]. Polysaccharide is biopolymer, and it is widely distributed in all animals, plants, fungi, and bacteria. Bacterial polysaccharides, especially those exopolysaccharide (EPS) produced by LAB, have been widely used in the food industry [6]. EPS from LAB has been reported to exhibit several types of biological activity, such as immunomodulatory, antioxidant, and antitumor activity [7,8,9]
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