title: Starch degradation and nutrition value improvement in corn grits by solid state fermentation technique with Coriolus versicolor.
abstract: The study was conducted to evaluate effect of Coriolus versicolor mycelia on degrading starch and improving nutrition value in corn grits through solid state fermentation technique. The results showed that using soybean meal as a nitrogen source, α-amylase secreted from C. versicolor expressed 407.25U/g of activity, leading to 45.15% of starch degraded. The activity grew with fermentation time until the 15(th) day, after that the amylase was deactivated rapidly. An orthogonal experiment designed for the study illustrated that degradation rate of starch in corn grits attained to maximum, 50.51%, when 100g of corn grits, added 16g of soybean meal, were fermented by C. versicolor for 12 days, in an initial pH 5.5. After fermenting, compared to the nonfermented control, contents of amino acids, total sugar, crude fat and crude protein were increased by 21.00%, 38.45%, 55.56%, 69.15% respectively. The significant improvement of nutrition value in corn grits is probably attributed to the intense metabolism of C. versicolor.
authors.affiliation: College of Life Science, South China Normal University , Guangzhou, P.R. China.
authors.forename: Mian
authors.initials: M
authors.lastname: Huang
authors.forename: Song
authors.initials: S
authors.lastname: Zhang
keywords: Coriolus versicolor; corn grits; solid state fermentation; starch; α-amylase
references.citation: Oncol Rep. 2006 Sep;16(3):609-16
references.pmid: 16865263
references.citation: Biomed Pharmacother. 2009 Jul;63(6):409-12
references.pmid: 18848763
references.citation: Food Chem Toxicol. 2008 May;46(5):1825-33
references.pmid: 18313195
references.citation: Bioresour Technol. 2004 Jul;93(3):261-8
references.pmid: 15062821
references.citation: Int J Food Microbiol. 2003 Jan 15;80(1):61-6
references.pmid: 12430772
references.citation: Braz J Microbiol. 2009 Jul;40(3):636-48
references.pmid: 24031409
references.citation: BMC Cancer. 2008 Mar 24;8:78
references.pmid: 18366723
references.citation: Braz J Microbiol. 2009 Jul;40(3):612-22
references.pmid: 24031406
references.citation: Int J Immunopharmacol. 1998 Apr-May;20(4-5):125-39
references.pmid: 9730249
references.citation: Eur J Biochem. 1974 Jan 3;41(1):171-80
references.pmid: 4856205
references.citation: J Appl Microbiol. 2005;99(4):910-5
references.pmid: 16162243