Abstract
A new hydrogen-producing bacterium was isolated from the intestine of wild carp (Cyprinus carpio L.) of the Tarim River Basin. The isolate was identified as Klebsiella sp. based on 16S rDNA gene sequencing and examination of physiological and biochemical characteristics. The isolated strain, Klebsiella sp. WL1316, could effectively produce a high yield of hydrogen by using cotton stalk hydrolysate as substrate. The optimum fermentation conditions for hydrogen production were determined as follows: an initial sugar concentration of 40 g/L, a fermentation temperature of 37 °C and an initial pH value of 8.0. The scaled-up fermentation process was conducted in a 5-L fermenter using these parameters. Higher productivities with maximum daily hydrogen production of 937.0 ± 41.0 mL L−1 day−1, cumulative hydrogen production of 2908.5 ± 47.4 mL L−1, viable cell count of (20.2 ± 0.6) × 108 CFU mL−1 and hydrogen yield of 1.44 ± 0.08 mol mol−1sugarconsumed were obtained. The cumulative hydrogen production was predicted by the modified Gompertz equation with R2 of 0.997, and values of R m and P were 44.8 mL L−1 h−1 and 3057.6 mL L−1, respectively. These results indicated that the strain Klebsiella sp. WL1316 resulted in a high hydrogen production rate (HPR) and good hydrogen production potential. Moreover, this strain exhibited higher values of maximum hydrogen yield and HPR than the reported pure cultures.
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This research was financially supported by the National Natural Science Foundations of China (21406150, 21476017).
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The protocol of the present study was given approval by the Tarim University Institutional Animal Care and Use Committee. And the procedures of harvest samples followed the Guidelines on Ethical Treatment of Experimental Animals enacted by the Ministry of Science and Technology, China.
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Li, Y., Zhang, Q., Deng, L. et al. Biohydrogen production from fermentation of cotton stalk hydrolysate by Klebsiella sp. WL1316 newly isolated from wild carp (Cyprinus carpio L.) of the Tarim River basin. Appl Microbiol Biotechnol 102, 4231–4242 (2018). https://doi.org/10.1007/s00253-018-8882-z
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DOI: https://doi.org/10.1007/s00253-018-8882-z