Premium
High conversion efficiency of Japanese cedar hydrolyzates into acetic acid by co‐culture of Clostridium thermoaceticum and Clostridium thermocellum
Author(s) -
Rabemanolontsoa Harifara,
Kuninori Yoshimizu,
Saka Shiro
Publication year - 2016
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.4679
Subject(s) - acetic acid , biomass (ecology) , fermentation , lignocellulosic biomass , chemistry , clostridium thermocellum , organic chemistry , food science , lignin , acetic anhydride , pulp and paper industry , hydrolysis , catalysis , biology , agronomy , cellulase , engineering
Abstract BACKGROUND Acetic acid is an important reagent and precursor in chemical and material industries. It is largely manufactured from fossil resources, but with increasing environmental concerns and uncertain petroleum availability, producing organic acids from renewable biomass has become a priority. Several researchers have demonstrated acetic acid production from model compounds, food products or a minor portion of lignocellulosic biomass but the simultaneous fermentation of all biomass‐derived products has not been reported yet. This work demonstrates the unique capabilities of Clostridium thermoaceticum and Clostridium thermocellum in co‐culture to convert most products obtained from hot‐compressed water treatment of Japanese cedar into acetic acid. RESULTS Under an optimal pH found to be 6.5, most cello‐oligosaccharides and xylo‐oligosaccharides as well as the majority of monosaccharides were completely consumed after 40 h, while the lignin‐derived products, organic acids, decomposed and dehydrated compounds required 72 h to be fermented. Overall, it was found that most of the water‐soluble lignocellulosic hydrolyzates were successfully transformed into acetic acid, leading to a high carbon conversion efficiency of 84.9%. CONCLUSION Biomass‐derived compounds from hot‐compressed water treatment were efficiently converted to acetic acid, a valuable intermediate for further biotechnological production of chemicals and materials to substitute fossil‐derived ones. © 2015 Society of Chemical Industry