| Summary: | 碩士 === 輔仁大學 === 食品科學系碩士班 === 104 === Soy products are common in our lives. It’s an excellent source for energy and nutrition that contains plant proteins, dietary fiber, oligosaccharides, vitamins, and mineral. Soybean residue is the byproduct from the processing of soybean. It’s also rich in nutritional values and has high potential for developing funtional foods. The objective of this study is to investigate the manufacturing process of Lactobacillus plantarum TWK10-fermentated soybean and soybean residue. Different concentrations of soybean residue and soybean powder were used as substrate and fermented with L. plantarum TWK10. The isoflavone contents and peptide contents were evaluated and measured antioxidant properties and storage stability. The results showed that the daidzein, genistein and equol contents of L. plantarum TWK10-fermented soybean residue and soybean powder were higher than non-fermented. The 8% okara soybean residue and soybean powder showed the largest amount and significantly higher than others (p<0.05). Similarly, the peptide contents of ethanol and water extracts of L. plantarum TWK10-fermented soybean residue and soybean powder were higher than unfermented. At the concentration of 6% soybean residue and soy powder can be obtained the large amount of peptide content. Therefore, the extracts of L. plantarum TWK10-fermented soybean residue had higher ACE activity inhibitory than L. plantarum TWK10-fermented soybean powder. DPPH free radical scavenging activity, ferrous ion chelating ability and reducing activity of L. plantarum TWK10-fermented soybean residue and soybean powder at the concentration of 6% and 8% were higher than non-fermented and also had dose-dependent effect. The contents of daidzein and genistein of L. plantarum TWK10-fermented soybean residue and soybean powder were not significant decrease during storage in 4oC, 25oC and pH 7. These results indicated that 6 and 8% soybean residue and soybean powder are the best concentration for L. plantarum TWK10-fermented and have excellent antioxidant activity and ACE activity inhibitory. It can be used in antioxidant and antihypertensive products in the future.
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