Brewer's spent grain and corn steep liquor as substrates for cellulolytic enzymes production by Streptomyces malaysiensis.
OBJECTIVE
To evaluate cellulase production by Streptomyces malaysiensis in submerged fermentation using brewer's spent grain (BSG) and wheat bran (WB) as carbon source, and corn steep liquor (CSL) as nitrogen source, as compared to yeast extract (YE), and partial characterization of the crude enzyme.


RESULTS
Maximum cellulase production by Streptomyces malaysiensis (720 U l(-1)) occurred within 4 days incubation when using a growth medium containing BSG 0.5% (w/v) and CSL1.2% (w/v). CMCases activity showed to be stable over an acidic pH range (2.0-7.0) and in temperatures of 40-60 degrees C. Zymogram indicated three bands of CMCase activity, with different molecular masses.


CONCLUSIONS
S. malaysiensis was able to grow and produce good levels of CMCases using solely brewer's spent grain and corn steep liquor as low-cost substrates, making this strain and these low cost by-product worthy for further investigation, and potentially feasible for biotechnological applications in different areas.


CONCLUSIONS
To our knowledge, this is the first study reporting the use of the low-cost by-products brewer's spent grain and corn steep liquor, as sole substrates for microbial enzyme production.
Nascimento
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RP
Centro de Ciências Agrárias, Universidade Federal do Recôncavo da Bahia, Ambientais e Biológicas, Cruz das Almas, Brazil. rpn1978@gmail.com
Junior
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Pereira
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Bon
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Coelho
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RR
D001426:Bacterial Proteins / Q000737:chemistry / Q000378:metabolism*; D002480:Cellulase / Q000737:chemistry / Q000378:metabolism*; D003470:Culture Media / Q000737:chemistry / Q000378:metabolism; D002523:Edible Grain / Q000378:metabolism*; D004795:Enzyme Stability; D005285:Fermentation; D007218:Industrial Microbiology; D008970:Molecular Weight; D013302:Streptomyces / Q000737:chemistry / Q000201:enzymology* / Q000378:metabolism; D003313:Zea mays / Q000378:metabolism*
D001426:Bacterial Proteins; D003470:Culture Media; D002480:Cellulase; C019826:carboxymethylcellulase