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A Process Study of Lactic Acid Production from Phragmites australis Straw by a Thermophilic Bacillus coagulans Strain under Non-Sterilized Conditions

College of Life Sciences, Hebei University, Baoding 071002, China
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Processes 2018, 6(10), 175; https://doi.org/10.3390/pr6100175
Received: 12 September 2018 / Revised: 25 September 2018 / Accepted: 28 September 2018 / Published: 1 October 2018
(This article belongs to the Section Biological Processes and Systems)
Phragmites australis straw (PAS) is an abundant and renewable wetland lignocellulose. Bacillus coagulans IPE22 is a robust thermophilic strain with pentose-utilizing capability and excellent resistance to growth inhibitors. This work is focused on the process study of lactic acid (LA) production from P. australis lignocellulose which has not been attempted previously. By virtue of thermophilic feature of strain IPE22, two fermentation processes (i.e., separated process and integrated process), were developed and compared under non-sterilized conditions. The integrated process combined dilute-acid pretreatment, hemicellulosic hydrolysates fermentation, and cellulose utilization. Sugars derived from hemicellulosic hydrolysates and cellulose enzymatic hydrolysis were efficiently fermented to LA in a single vessel. Using the integrated process, 41.06 g LA was produced from 100 g dry PAS. The established integrated process results in great savings in terms of time and labor, and the fermentation process under non-sterilized conditions is easy to scale up for economical production of lactic acid from PAS. View Full-Text
Keywords: lactic acid; SSCF; Bacillus coagulans; Phragmites australis; hemicellulosic hydrolysates lactic acid; SSCF; Bacillus coagulans; Phragmites australis; hemicellulosic hydrolysates
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MDPI and ACS Style

Zhang, Y.; Li, M.; Nie, T.; Ni, Z. A Process Study of Lactic Acid Production from Phragmites australis Straw by a Thermophilic Bacillus coagulans Strain under Non-Sterilized Conditions. Processes 2018, 6, 175. https://doi.org/10.3390/pr6100175

AMA Style

Zhang Y, Li M, Nie T, Ni Z. A Process Study of Lactic Acid Production from Phragmites australis Straw by a Thermophilic Bacillus coagulans Strain under Non-Sterilized Conditions. Processes. 2018; 6(10):175. https://doi.org/10.3390/pr6100175

Chicago/Turabian Style

Zhang, Yuming, Mengran Li, Tian Nie, and Zhihua Ni. 2018. "A Process Study of Lactic Acid Production from Phragmites australis Straw by a Thermophilic Bacillus coagulans Strain under Non-Sterilized Conditions" Processes 6, no. 10: 175. https://doi.org/10.3390/pr6100175

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