Journal
BIORESOURCE TECHNOLOGY
Volume 102, Issue 2, Pages 1581-1586Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2010.08.091
Keywords
Particle size; Fungal growth; Enzymatic selectivity; Classified substrate
Funding
- Red-PROMEP
- National Council of Science and Technology (CONACyT) [61395]
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The growth of Pleurotus ostreatus was analyzed on three particle sizes of sugar cane bagasse: 0.92 mm and 1.68 mm in diameter, in addition to heterogeneous fibers (average 2.9 mm in diameter). Specific growth rate on heterogeneous particles was lower (mu = 0.043 h(-1)), although soluble protein production was maximal (809 mu g/g dry wt). Higher mu values were reached on the other two particles sizes (0.049-0.05 h(-1)) with less soluble protein (500 mu g/g dry wt). Xylanases and laccases were favored in heterogeneous particles; while the highest selectivity for xylanases over cellulases was observed in 1.68 mm particles, corresponding with the maximal hemicellulose breakdown. Lignin and cellulose were preferentially degraded in smallest particles. This study shows that the geometrical ratio, shape and size of sugar cane bagasse fibers strongly influence packing density for SSF substrate, with an impact in the production of extracellular enzymes, growth rates and composition changes in substrate. (C) 2010 Elsevier Ltd. All rights reserved.
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