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Efficient hydrogen production from acetate through isolated Rhodobacter sphaeroides

Paper ID Volume ID Publish Year Pages File Format Full-Text
20940 43198 2011 4 PDF Available
Title
Efficient hydrogen production from acetate through isolated Rhodobacter sphaeroides
Abstract

Photosynthetic bacteria produce hydrogen from lactate and acetate that are products of hydrogen producing bacteria in the dark. Thus, their coculture is a promising method for hydrogen production. However, the hydrogen production yield from acetate of Rhodobacter sphaeroides RV, which has been shown to possess the highest yield and hydrogen production rate, is low as compared to that from lactate. Photosynthetic bacteria that produce hydrogen from acetate as well as lactate were screened from lakes and swamps in the Tokyo and Chiba areas in Japan. Seventy-six strains of photosynthetic bacteria were obtained and the analysis of their 16S rRNA gene sequences revealed that they belong to R. sphaeroides. Among the isolated bacteria, R. sphaeroides HJ produced the highest amount of hydrogen from acetate and lactate. The HJ strain produced a 2300 ± 93 ml/L-broth of hydrogen from 75 mM acetate consumed during for 120 h of fermentation. The amount of hydrogen and the yield from acetate were 1.9 and 2.1 times higher, respectively, than those of R. sphaeroides RV. The amount and yield of hydrogen, produced by R. sphaeroides HJ from lactate were similar to those produced by R. sphaeroides RV. Since the amount and yield of produced hydrogen by the HJ strain were similar regardless of the substrate (acetate or lactate), its metabolic pathway could have a key to increasing hydrogen production from acetate.

Keywords
Acetate; Lactate; Polyhydroxybutyrate (PHB); Photosynthetic bacteria; Hydrogen production; Rhodobacter sphaeroides
First Page Preview
Efficient hydrogen production from acetate through isolated Rhodobacter sphaeroides
Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Bioscience and Bioengineering - Volume 112, Issue 6, December 2011, Pages 602–605
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering