stutzeri and its
pH was maintained at 4.0, at temperature 70 °C. Since, the effluent’s initial pH is 6.0, when effluent was inoculated with the identified organism P. stutzeri, the strain starts producing hydrogen immediately. The influence of pH change on hydrogen production was Modulators observed to find the maximum hydrogen production. this website The hydrogen produced was measured by simple water displacement method for a period of 5 days. 21 P. stutzeri SSKVM 2012 is found to be thermophilic, rod shaped, gram negative, anaerobic with an optimum growth at 70 °C. The strain is alkaliphilic and able to grow at wide range of pH from 5.5 to 9.0. There was no growth observed at pH 4.0–pH 5.0 or below. Further pH in the range of 6.5–8.5 was found to be a favourable for the strain to produce hydrogen. The strain hydrolyses starch and found to produce hydrogen sulphide. The 16S rRNA gene sequence of isolate confirms that the organism isolated was P. stutzeri. The sequence of P. stutzeri (HM209781.1) had 99% identity to Pseudomonas xanthomarina (HQ848111.1) and Pseudomonas knackmussii (JN646015.1) and these two sequences grouped together in a phylogenetic tree ( Fig. 1). The sequence reported in this paper has been deposited in the genbank under the accession number JX442762 and the strain identified from the thermal soil sample was named http://www.selleckchem.com/products/NVP-AUY922.html as SSKVM 2012. The hydrogen
production from starch, sucrose measured by water displacement method is shown in Table 1. Initial pH of the soluble starch, sucrose medium was maintained at pH 4.0 and at 70 °C. No hydrogen during production was observed
at initial pH 4.0 to pH 5.0. The maximum hydrogen production observed for starch was 255.98 ± 0.76 ml, 195.87 ± 0.82 ml, 176.84 ± 0.64 ml, 125.83 ± 0.64 ml. Similarly, the sucrose showed 212.82 ± 0.57 ml, 194.85 ± 0.69 ml, 191.85 ± 0.76 ml, 177.92 ± 0.78 in 7.5 g/1500 ml, 5.0 g/1000 ml, 3.75 g/750 ml, 2.5 g/500 ml respectively. Among the different concentrations used 7.5 g starch showed highest hydrogen production. The hydrogen production from effluent is shown in Table 2. The initial pH of the mango juice effluent was found to be pH 6.0. The effluent was inoculated with culture P. stutzeri and the study was performed at 70 °C. The maximum hydrogen production observed was 190.03 ± 0.81 ml, 186.13 ± 0.57 ml, 144.96 ± 0.72 ml, 104.93 ± 0.64 ml in 1500 ml, 1000 ml, 750 ml, 500 ml mango juice effluent at pH 8.0. The hydrogen production was found to be low when compared to starch and sucrose but the effluent is recycled to an useful product and signifies eco-friendly environment. Water displacement methods can be more effective as pressure is released, but gases can disproportionally dissolve based on their different solubilities in the solution, making it difficult to determine the produced gas composition. Biological H2 production is the most challenging area of biotechnology with respect to environmental problems.