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      Starch degradation and nutrition value improvement in corn grits by solid state fermentation technique with Coriolus versicolor

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          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.

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          Most cited references22

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          Anti-tumor effect of Coriolus versicolor methanol extract against mouse B16 melanoma cells: in vitro and in vivo study.

          Numerous studies have shown immunostimulatory and anti-tumor effects of water and standardized aqueous ethanol extracts derived from the medicinal mushroom, Coriolus versicolor, but the biological activity of methanol extracts has not been examined so far. In the present study we investigated the anti-tumor effect of C. versicolor methanol extract (which contains terpenoids and polyphenols) on B16 mouse melanoma cells both in vitro and in vivo. In vitro treatment of the cells with the methanol extract (25-1600 microg/ml) reduced melanoma cell viability in a dose-dependent manner. Furthermore, in the presence of the methanol extract (200 microg/ml, concentration IC(50)) the proliferation of B16 cells was arrested in the G(0)/G(1) phase of the cell cycle, followed by both apoptotic and secondary necrotic cell death. In vivo methanol extract treatment (i.p. 50 mg/kg, for 14 days) inhibited tumor growth in C57BL/6 mice inoculated with syngeneic B16 tumor cells. Moreover, peritoneal macrophages collected 21 days after tumor implantation from methanol extract-treated animals exerted stronger tumoristatic activity ex vivo than macrophages from control melanoma-bearing mice. Taken together, our results demonstrate that C. versicolor methanol extract exerts pronounced anti-melanoma activity, both directly through antiproliferative and cytotoxic effects on tumor cells and indirectly through promotion of macrophage anti-tumor activity.
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            Production of thermostable invertases by Aspergillus caespitosus under submerged or solid state fermentation using agroindustrial residues as carbon source

            The filamentous fungus Aspergillus caespitosus was a good producer of intracellular and extracellular invertases under submerged (SbmF) or solid-state fermentation (SSF), using agroindustrial residues, such as wheat bran, as carbon source. The production of extracellular enzyme under SSF at 30ºC, for 72h, was enhanced using SR salt solution (1:1, w/v) to humidify the substrate. The extracellular activity under SSF using wheat bran was around 5.5-fold higher than that obtained in SbmF (Khanna medium) with the same carbon source. However, the production of enzyme with wheat bran plus oat meal was 2.2-fold higher than wheat bran isolated. The enzymatic production was affected by supplementation with nitrogen and phosphate sources. The addition of glucose in SbmF and SSF promoted the decreasing of extracellular activity, but the intracellular form obtained in SbmF was enhanced 3-5-fold. The invertase produced in SSF exhibited optimum temperature at 50ºC while the extraand intracellular enzymes produced in SbmF exhibited maximal activities at 60ºC. All enzymatic forms exhibited maximal activities at pH 4.0-6.0 and were stable up to 1 hour at 50ºC.
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              Solid-state fermentation of cornmeal with the basidiomycete Ganoderma lucidum for degrading starch and upgrading nutritional value.

              The objective of this research was to study the ability of the basidiomycete Ganoderma lucidum to degrade starch and upgrade nutritional value of cornmeal during solid-state fermentation (SSF).
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                Author and article information

                Journal
                Braz J Microbiol
                Braz. J. Microbiol
                bjm
                bjm
                Brazilian Journal of Microbiology
                Sociedade Brasileira de Microbiologia
                1517-8382
                1678-4405
                Oct-Dec 2011
                1 December 2011
                : 42
                : 4
                : 1343-1348
                Affiliations
                College of Life Science, South China Normal University , Guangzhou, P.R.China
                Author notes
                [* ] Corresponding Author. Mailing address: College of Life Science, South China Normal University. Guangzhou, P.R. China.; Tel.: 86 020 85216139–8226.; Email: zhangs@ 123456scnu.edu.cn
                Article
                S1517-838220110004000015
                10.1590/S1517-838220110004000015
                3768736
                24031762
                2ca311a1-c8f7-4c01-9e47-7734589678a9
                © Sociedade Brasileira de Microbiologia

                All the content of the journal, except where otherwise noted, is licensed under a Creative Commons License

                History
                : 29 November 2009
                : 15 April 2011
                : 06 June 2011
                Categories
                Industrial Microbiology
                Research Paper

                coriolus versicolor,corn grits,starch,solid state fermentation,α-amylase

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