期刊
OPEN LIFE SCIENCES
卷 15, 期 1, 页码 185-197出版社
DE GRUYTER POLAND SP Z O O
DOI: 10.1515/biol-2020-0019
关键词
Paenibacillus alvei; Cellulase; Date palm leaves; Lactic acid; SSF
类别
资金
- Deanship of Scientific Research at King Khalid University [R.G.P. 1/61/39]
Cellulosic date palm wastes may have beneficial biotechnological applications for eco-friendly utilization. This study reports the isolation of thermophilic cellulaseproducing bacteria and their application in lactic acid production using date palm leaves. The promising isolate was identified as Paenibacillus alvei by 16S rRNA gene sequencing. Maximum cellulase production was acquired using alkaline treated date palm leaves (ATDPL) at 48 h and yielded 4.50 U.mL(-1) FPase, 8.11 U.mL(-1) CMCase, and 2.74 U.mL(-1) beta-glucosidase. The cellulase activity was optimal at pH 5.0 and 50 degrees C with good stability at a wide temperature (40-70 degrees C) and pH (4.0-7.0) range, demonstrating its suitability in simultaneous saccharification and fermentation. Lactic acid fermentation was optimized at 4 days, pH 5.0, 50 degrees C, 6.0% cellulose of ATDPL, 30 FPU/g cellulose, 1.0 g. L-1 Tween 80, and 5.0 g. L-1 yeast extract using Lactobacillus delbrueckii. The conversion efficiency of lactic acid from the cellulose of ATDPL was 98.71%, and the lactic acid productivity was 0.719 g. L-1 h(-1). Alkaline treatment exhibited a valuable effect on the production of cellulases and lactic acid by reducing the lignin content and cellulose crystallinity. The results of this study offer a credible procedure for using date palm leaves for microbial industrial applications.
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