Utilization of cotton stalk waste for sustainable isopropanol production via hydrolysis and coculture fermentation

IF 4.1 2区 环境科学与生态学 Q2 BIOTECHNOLOGY & APPLIED MICROBIOLOGY
Barsha Samantaray , Sonali Mohapatra , Biswaranjan Pradhan , Bikash Chandra Behera , Rashmi Ranjan Mishra , Hrudayanath Thatoi
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Abstract

The present investigation focused on isopropanol production from lignocellulosic cotton stalk biomass (CSB) using conventional pretreatment, enzymatic hydrolysis and fermentation methods. In comparison to alkaline (NaOH) pretreatment, dilute sulphuric acid (H2SO4) pretreatment showed higher cellulose exposure (448.5 mg/g). Further, ultrasono assisted acid and alkali pretreatment was performed for maximum exposure of cellulose and it was found 616.9 and 586.15 mg/g respectively. Chemical pretreated CSB was additionally exposed to independent enzymatic hydrolysis using commercial enzymes (Celluclast and Viscozymes) following Response Surface Methodology (RSM), which revealed a maximal production of glucose and xylose yield (544.6 mg/g and 41.8 mg/g). Pretreated and enzymatic hydrolyzed cotton stalk biomass at various conditions were analysed using SEM, FTIR, and XRD to determine the structural and functional changes. Further, a co-culture strategy was employed on pretreated and hydrolyzed CSB using two fermented yeast strains (Saccharomyces cerevisiae and Pichia pastoris) for isopropanol production. HR-MS analysis revealed that the maximum concentration of isopropanol (126.228 mM) was produced in 2:1 proportionate ratio of two fermented yeasts with 20 g/L of substrate loadings at 72 h of incubation time. These results indicate that the production of isopropanol (7.46 g/L) from CSB with different parametric conditions is an encouraging step and can be exploited further for various industrial applications.

通过水解和共培养发酵法利用棉花茎秆废料可持续生产异丙醇
本研究的重点是利用传统预处理、酶水解和发酵方法从木质纤维素棉秆生物质(CSB)中生产异丙醇。与碱性(NaOH)预处理相比,稀硫酸(H2SO4)预处理显示出更高的纤维素暴露量(448.5 mg/g)。此外,超声波辅助酸碱预处理的纤维素暴露量最大,分别为 616.9 毫克/克和 586.15 毫克/克。此外,还使用商业酶(Celluclast 和 Viscozymes)对经过化学预处理的 CSB 进行了独立的酶水解,并采用了响应面法(RSM),结果显示葡萄糖和木糖的产量最大(544.6 毫克/克和 41.8 毫克/克)。使用扫描电镜、傅立叶变换红外光谱和 X 射线衍射仪分析了不同条件下预处理和酶水解的棉秆生物质,以确定其结构和功能变化。此外,还使用两种发酵酵母菌株(酿酒酵母(Saccharomyces cerevisiae)和酿酒酵母(Pichia pastoris))对预处理和水解后的棉秆生物质进行共培养,以生产异丙醇。HR-MS 分析表明,在培养 72 小时后,两种发酵酵母菌按 2:1 的比例与 20 克/升的底物添加量作用下,产生的异丙醇浓度最高(126.228 毫摩尔)。这些结果表明,在不同参数条件下利用 CSB 生产异丙醇(7.46 克/升)是一个令人鼓舞的步骤,可进一步用于各种工业应用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
9.60
自引率
10.40%
发文量
107
审稿时长
21 days
期刊介绍: International Biodeterioration and Biodegradation publishes original research papers and reviews on the biological causes of deterioration or degradation.
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