Industrial Culture Medium Optimization of Xanthan Gum Production (Xanthomonas campestri) by RSM Simplified
Subject Areas : MicrobiologyZ. Forghani 1 , M. Mosavinasab 2 , S. Khoshnodinia 3
1 - دانشآموختهکارشناسی ارشد بخش علوم و صنایع غذایی، دانشکده کشاورزی، دانشگاه شیراز، شیراز، ایران
2 - استاد بخش علوم و صنایع غذایی و رئیس گروه فرآوری آبزیان، دانشکده کشاورزی، دانشگاه شیراز، شیراز، ایران
3 - دانشجوی دکترای بخش علوم و صنایع غذایی، دانشکده کشاورزی، دانشگاه شیراز، شیراز، ایران
Keywords:
Abstract :
Introduction: Xanthan gum shows pseudoplastic behavior in solutions, and has less ‘gummy’mouth feel than Newtonian ones. Therefore, xanthan gum has major application in foodindustry as a thickening and suspending agent. Xanthan gum is a bacterial gum and theproduction process is largely affected by the culture medium compositions. The aim of thisstudy was to optimize an economic industrial medium for maximum yield of xanthan gum.Materials and Methods: Xanthan gum production by Xanthomonas campestris ATCC 1395using different culture medium was carried out in a stirred bioreactor with controlled pH anddissolved oxygen. A fractional factorial design was applied to identify the effective factors onxanthan gum production. Central composite design and response surface methodology wereused to evaluate the individual and interactive effects of four major significant variables(glucose, sucrose, yeast extracts and (NH4)2SO4) on biomass and xanthan gum production insubmerged culture medium composition.Results: The results indicated that both carbon and nitrogen sources had strong positiveeffects on xanthan gum production, but the carbon source, especially glucose, was determinedto be more significant factor than nitrogen source in growth cell and production of gum. theoptimum culture medium for producing xanthan gum was composed of 53.75 (g/L) glucose,27.8 (g/L) sucrose, 7.8 yeast-extract (g/L) and 5.6 (NH4)2SO4 (g/L). After 36 hours under theoptimized culture medium in 5-L bioreactor the xanthan gum yield reached about 12.26±0.44g/L, which was found to be in good agreement with the predicated value (12.43 g/L).Conclusion: The optimized culture medium studied here can be a good candidate to improvethe yield and consequently be more cost-effective in the production of xanthan gum.
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