Microbial consortia for saccharification of woody biomass and ethanol fermentation

Dayanand Kalyani, Kyung-Min Lee, Tae-Su Kim, Jinglin Li, Saurabh Sudha Dhiman, Yun Chan Kang, Jung-Kul Lee

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Newly isolated Sistotrema brinkmannii and Agaricus arvensis were co-cultured using rice straw (20 g/L) as
a carbon source and yeast extract (10 g/L) as a nitrogen source to produce high levels of cellobiohydrolase
(12.6 U/mL), b-glucosidase (21 U/mL), and endoglucanase (16.4 U/mL). The filter paper activity (FPU) of
the mixed fungal culture was enhanced (1.61 FPU/mL) compared to that of S. brinkmannii (0.3 FPU/mL)
or A. arvensis (0.5 FPU/mL) monoculture. Enzyme loading, substrate concentration, pH, and temperature
were optimized by response surface methodology (RSM) to improve the saccharification yield of alkalipretreated plant biomasses. The highest enzymatic hydrolysis (76.7%) was obtained from Pinus densiflora under the following conditions: crude enzyme loading 22.5 FPU/g-substrate, substrate 3.75%, temperature 35 C, and pH 5. The enzymatic hydrolyzate of pretreated P. densiflora was used for ethanol production using Saccharomyces cerevisiae, Pichia stipitis, and a co-culture of both the strains. The co-culture of S. cerevisiae and P. stipitis produced 23% more ethanol than that produced by S. cerevisiae alone and 38% more ethanol than that produced by P. stipitis alone. This study shows the potential of exploiting a microbial consortium for the cost-effective production of cellulases for bioethanol processes.
Original languageEnglish
JournalFuel
Volume107
Pages (from-to)815-822
ISSN0016-2361
Publication statusPublished - 2013
Externally publishedYes

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