Abstract
An environmental method for using soybean curd residue (SCR) and rice bran (RB) was developed in this study. SCR and RB were utilized as growth medium for Preussia aemulans, a new fungus isolated from Cordyceps sinensis fruiting body. According to Orthogonal test and Duncan’s multiple range test, the optimum fermentation condition of fermented SCR and RB for producing polysaccharide, adenosine and ergosterol were summarized. Under the optimum fermentation condition of SCR, the polysaccharide, adenosine and ergosterol contents were reached to 39.18 ± 1.06 mg/g dry matter, 127.94 ± 1.82 mg/100g dry matter and 37.53 ± 0.11 mg/100g dry matter, respectively. And under the optimum fermentation condition of RB, the content of polysaccharide, adenosine and ergosterol were also enhanced 3-fold, 10-fold and 10-fold, respectively. Therefore, the fermented SCR and RB could be utilized as nutritious functional food or food additives in the future.
Highlights
In recent years, due to the serious economic and environmental concerns, the utilization of food by-products is unprecedentedly expected to increase and become more efficient
soybean curd residue (SCR) and rice bran (RB) were utilized as growth medium for Preussia aemulans, a new fungus isolated from Cordyceps sinensis fruiting body
The R value of various factors indicated that the nitrogen source was the highest among these factors
Summary
Due to the serious economic and environmental concerns, the utilization of food by-products is unprecedentedly expected to increase and become more efficient. Reduce, reuse, and recycle (3R) of by-products is getting more and more important in food industries (Wang & Nishino, 2008). Soybean curd residue (SCR), is produced from the tofu industry in China and Japan. It was once consumed as a traditional food, but modernization and urbanization in the lifestyle has reduced its status to that of a mere industrial waste, which is mainly incinerated like other industrial wastes (Ohno, Ano, & Shoda, 1996; O'Toole, 1999). In Japan, 0.7 million tons of SCR is disposed annually, mostly by incineration which has caused severe environmental pollution (Mizumoto, Hirai, & Shoda, 2006). Many researchers have investigated the possibility of bioconversion of the residues by submerged and solid-state cultivation (Yokoi, Maki, Hirose, & Hayashi, 2002; Shi, Yang, Li, Wang, & Zhang, 2011)
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