FOOD SCIENCE ›› 2014, Vol. 35 ›› Issue (1): 174-179.doi: 10.7506/spkx1002-6630-201401034

Previous Articles     Next Articles

Cellulase Production from Tea Seed (Camellia oleifera) Cake Using Neurospora crassa Mixed with Other Bacteria

LIU Pei-yi, DENG Ze-yuan, YANG Jian-yuan, LI Jing*   

  1. State Key Laboratory of Food Science and Technology, Institute for Advanced Studies, Nanchang University, Nanchang 330047, China
  • Received:2013-07-01 Revised:2013-11-20 Online:2014-01-15 Published:2014-01-22
  • Contact: LI Jing E-mail:jingjingbailu@yahoo.com.cn

Abstract:

The production of cellulaes from tea seed (Camellia oleifera) cake with a minimized content of residual tea
saponin of 0.917% as obtained by ultrasonic extraction method was studied in solid-state fermentation by mixed strains of
Neurospora crassa with Issatchenkia oriental, Trichoderma reesei, Trichoderma vivide or L. plantarum. The activities of
cellobiohydrolase 1 (C1), β-1,4-endoglucanase (Cx) and β-glucosidase (β-G) and filter paper activity (FPA) in fermentation
supernatants were determined to explore their synergistic action on enzymatic hydrolysis of cellulose. The enzyme activity of
C1 from Neurospora crassa combined with Trichoderma vivide was increased by 51.09% compared with that obtained from
single-strain fermentation by Neurospora crassa; meanwhile, the combination of both strains resulted in prolonged secretion
of cellulases, and the FPA activity reached 2.782 U/g after 96 h. The cellulose was degraded by 64.19% and 61.59% in tea
seed cake fermented for 10 days by Neurospora crassa mixed with Trichoderma reesei and Trichoderma vivide, respectively.
The overall tendency of the enzyme activities was an increase with increasing the inoculum size irrespective of fermentation
with Neurospora crassa alone or combined with other strains. However, the cellulase activities were declined at higher
inoculum sizes surpassing 9 mL/100 g of Neurospora crassa when inoculated alone. These results indicate that Neurospora
crassa is able to cooperate with Trichoderma reesei and Trichoderma vivide respectively to degrade cellulose.

Key words: Neurospora crassa, cellulases, mixed-bacteria fermentation, solid-state fermentation, tea seed

CLC Number: