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Processes 2018, 6(10), 175; https://doi.org/10.3390/pr6100175

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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Received: 12 September 2018 / Revised: 25 September 2018 / Accepted: 28 September 2018 / Published: 1 October 2018
(This article belongs to the Section Biological Systems)
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Abstract

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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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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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.

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