Butyric Acid Fermentation from Rice Straw with Undefined Mixed Culture: Enhancement by pH Control

2013 ◽  
Vol 807-809 ◽  
pp. 1198-1202
Author(s):  
Bin Ling Ai ◽  
Jian Zheng Li ◽  
Xue Chi ◽  
Jia Meng
Keyword(s):  
Mixed Culture ◽  
Rice Straw ◽  
Butyric Acid ◽  
Acid Production ◽  
Ph Control ◽  
Cellulolytic Enzyme ◽  
Acid Fermentation ◽  
Feeding Method ◽  
Butyric Acid Production ◽  
Ph Range

This study aimed to find out the optimum pH range and a buffer feeding method for butyric acid production from rice straw by undefined mixed culture. A serial experiment was conducted at various pH levels from 5.0 to 7.0. The results showed that neutral pH improved rice straw conversion and hence carboxylic acid production. The highest butyric acid production was achieved at pH range of 6.0 to 6.5. Another serial experiment was performed at pH 6.0 to 6.5 buffered with CaCO3, NaHCO3, NH4HCO3 and their combinations, respectively. The results indicated that different buffers had different effects on product spectrum, and that CaCO3 combined with NaHCO3 was an effective buffer for butyric acid production. This study presents an alternative way for butyric acid production from lignocellulosic biomass without supplementary cellulolytic enzyme.

scholarly journals Consolidated Bioprocessing for Butyric Acid Production from Rice Straw with Undefined Mixed Culture

2016 ◽  
Vol 7 ◽  
Author(s):  
Binling Ai ◽  
Xue Chi ◽  
Jia Meng ◽  
Zhanwu Sheng ◽  
Lili Zheng ◽  
...  
Keyword(s):  
Mixed Culture ◽  
Rice Straw ◽  
Butyric Acid ◽  
Acid Production ◽  
Consolidated Bioprocessing ◽  
Butyric Acid Production

Enhanced butyric acid production using mixed biomass of brown algae and rice straw by Clostridium tyrobutyricum ATCC25755

2019 ◽  
Vol 273 ◽  
pp. 446-453 ◽  
Author(s):  
Hyun Ju Oh ◽  
Ki-Yeon Kim ◽  
Kyung Min Lee ◽  
Sun-Mi Lee ◽  
Gyeongtaek Gong ◽  
...  
Keyword(s):  
Rice Straw ◽  
Butyric Acid ◽  
Brown Algae ◽  
Acid Production ◽  
Clostridium Tyrobutyricum ◽  
Mixed Biomass ◽  
Butyric Acid Production

scholarly journals A Series of Efficient Umbrella Modeling Strategies to Track Irradiation-Mutation Strains Improving Butyric Acid Production From the Pre-development Earlier Stage Point of View

2021 ◽  
Vol 9 ◽  
Author(s):  
Li Cao ◽  
Yue Gao ◽  
Xue-Zhen Wang ◽  
Guang-Yuan Shu ◽  
Ya-Nan Hu ◽  
...  
Keyword(s):  
Butyric Acid ◽  
Acid Production ◽  
Ion Irradiation ◽  
Monte Carlo Model ◽  
Food Additives ◽  
Heavy Ion ◽  
The European Union ◽  
Acid Fermentation ◽  
Logistic Regression Models ◽  
Butyric Acid Production

Clostridium tyrobutyricum (C. tyrobutyricum) is a fermentation strain used to produce butyric acid. A promising new biofuel, n-butanol, can be produced by catalysis of butyrate, which can be obtained through microbial fermentation. Butyric acid has various uses in food additives and flavor agents, antiseptic substances, drug formulations, and fragrances. Its use as a food flavoring has been approved by the European Union, and it has therefore been listed on the EU Lists of Flavorings. As butyric acid fermentation is a cost-efficient process, butyric acid is an attractive feedstock for various biofuels and food commercialization products. 12C6+ irradiation has advantages over conventional mutation methods for fermentation production due to its dosage conformity and excellent biological availability. Nevertheless, the effects of these heavy-ion irradiations on the specific productiveness of C. tyrobutyricum are still uncertain. We developed non-structured mathematical models to represent the heavy-ion irradiation of C. tyrobutyricum in biofermentation reactors. The kinetic models reflect various fermentation features of the mutants, including the mutant strain growth model, butyric acid formation model, and medium consumption model. The models were constructed based on the Markov chain Monte Carlo model and logistic regression. Models were verified using experimental data in response to different initial glucose concentrations (0–180 g/L). The parameters of fixed proposals are applied in the various fermentation stages. Predictions of these models were in accordance well with the results of fermentation assays. The maximum butyric acid production was 56.3 g/L. Our study provides reliable information for increasing butyric acid production and for evaluating the feasibility of using mutant strains of C. tyrobutyricum at the pre-development phase.

Bioaugmentation with Clostridium tyrobutyricum to improve butyric acid production through direct rice straw bioconversion

2018 ◽  
Vol 263 ◽  
pp. 562-568 ◽  
Author(s):  
Xue Chi ◽  
Jianzheng Li ◽  
Xin Wang ◽  
Yafei Zhang ◽  
Shao-Yuan Leu ◽  
...  
Keyword(s):  
Rice Straw ◽  
Butyric Acid ◽  
Acid Production ◽  
Clostridium Tyrobutyricum ◽  
Butyric Acid Production

Butyric Acid Fermentation of Sodium Hydroxide Pretreated Rice Straw with Undefined Mixed Culture

2014 ◽  
Vol 24 (5) ◽  
pp. 629-638 ◽  
Author(s):  
Binling Ai ◽  
Jianzheng Li ◽  
Xue Chi ◽  
Jia Meng ◽  
Chong Liu ◽  
...  
Keyword(s):  
Sodium Hydroxide ◽  
Mixed Culture ◽  
Rice Straw ◽  
Butyric Acid ◽  
Acid Fermentation ◽  
Butyric Acid Fermentation

pH-Shift Control Strategy for Butyric Acid Production by Clostridium thermobutyricum

2012 ◽  
Vol 550-553 ◽  
pp. 1218-1221
Author(s):  
Yin Liu ◽  
Fei Zhang ◽  
Ji Hong Zhao ◽  
Ming Bao Wei ◽  
Xue Peng Yang
Keyword(s):  
Conversion Efficiency ◽  
Butyric Acid ◽  
Control Strategy ◽  
Acid Production ◽  
Control Group ◽  
Acid Fermentation ◽  
Acid Yield ◽  
Ph Shift ◽  
Shift Control ◽  
Butyric Acid Production

Batch fermentations by Clostridium thermobutyricum ATCC49875 at various pH values ranging from 5.9 to 6.8 were investigated. Based on the analysis of the experimental results, a two-stage pH-shift control strategy was proposed, with the aim of improving the efficiency of butyric acid production. At the first 24 h, pH was controlled at 6.8 to obtain the higher μx, and subsequently pH 6.2 was used to maintain high μp to enhance the production of butyric acid. Compared to control group (those of constant pH operations), a fermentation process by using this control strategy for butyric acid production had a significant improvement on the maximal butyric acid (24.60 g/l vs. 20.06 g/l) and glucose conversion efficiency (49.20% vs. 46.33%). Fed-batch fermentation by using pH-shift control strategy was also applied to produce butyric acid; and the maximal butyric acid yield and glucose conversion efficiency reached 28.75 g/l and 47.92%, respectively. These results showed that pH-shift fermentation could serve as an excellent alternative to conventional butyric acid fermentation.

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