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2013 (Vol. 5, Issue: 6)
Article Information:

Production of Poly &beta-Hydroxybutyric Acid (PHB) by Rhizobium elti and Pseudomonas stutzeri

Elsayed B. Belal
Corresponding Author:  Elsayed B. Belal 

Key words:  PHB, Rhizobium elti, polyhydroxybutyrate, Pseudomonas stutzeri, , ,
Vol. 5 , (6): 273-284
Submitted Accepted Published
July 9, 2013 July 24, 2013 November 20, 2013

The amount of chemosynthetic plastic waste increases every year and exact time for its degradation is unknown. Two poly &beta-Hydroxybutyric producing bacteria from different microbial sources were isolated and characterized for their morphological, biochemical properties. Based on their 16S rDNA, they were identified as Rhizobium elti E1 and Pseudomonas stutzeri E114. The bacterial strains were screened for PHB production and compared for the intensity of fluorescence using Nile red staining methods. PHB production conditions were optimized with different carbon and nitrogen sources, the highest PHB production was observed with mannitol, sucrose and ammonium sulphate by R. elti and P. stutzeri, respectively. Regarding incubation time as well as temperature and pH, optimum PHB production conditions were 48 h, 30C and 7, respectively. R. elti P. stutzeri are capable of accumulating appreciable levels of PHB from glucose, xylose, lactose, whey, molasses, sugar cane bagasse, rice straw hydroysate when 2% from all substrates were used an alternative carbon for the PHB production. Ammonium sulphate was the best nitrogen source. C/N ratio was also one of the factors that affected the production of PHB. The ratio of C/N that reaches 20:1 was considered the best ratio to produce the highest production of PHB. The highest yield of PHB was done by P. stutzeri more than R. elti. The present study provide the useful data about the optimized conditions for PHB production by R. elti and P. stutzeri that can be utilized for industrial production of PHB, a fast emerging alternative of non biodegradable plastics.
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  Cite this Reference:
Elsayed B. Belal, 2013. Production of Poly &beta-Hydroxybutyric Acid (PHB) by Rhizobium elti and Pseudomonas stutzeri.  Current Research Journal of Biological Sciences, 5(6): 273-284.
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ISSN (Online):  2041-0778
ISSN (Print):   2041-076X
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