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Optimization of Xanthan Gum Production Using Cheese Whey and Response Surface Methodology
Seyyed Vahid Niknezhad,Mohammad Ali Asadollahi,Akram Zamani,Davoud Biria,Mohsen Doostmohammadi 한국식품과학회 2015 Food Science and Biotechnology Vol.24 No.2
Cheese whey lactose was used as a carbon source for xanthan gum production with Xanthomonas campestris and Xanthomonas pelargonii. Proteins were precipitated and removed from whey prior to fermentation. Box-Behnken response surface methodology was used for optimization of the carbon, magnesium, and phosphate source concentrations in the culture medium to maximize xanthan gum production. After 48 h of fermentation using X. campestris, the highest xanthan concentration (16.4 g/L) was achieved at 65.2 g/L of cheese whey (39.1 g/L of lactose), 14.8 g/L of phosphate (K H2PO4), and 1.1 g/L of magnesium (MgSO4·7H2O). The corresponding optimum cheese whey, phosphate, and magnesium concentrations in cultures of X. pelargonii were 80.0, 6.7, and 0.8 g/L, respectively, which resulted in a xanthan production of 12.8 g/L. The xanthan gum yield (g of xanthan/g of lactose) was 0.42 for X. campestris and 0.27 for X. pelargonii.
Seyyed Vahid Niknezhad,Mohammad Hossein Morowvat,Ghasem Najafpour Darzi,Aida Iraji,Younes Ghasemi 한국식품과학회 2018 Food Science and Biotechnology Vol.27 No.6
Exopolysaccharide (EPS), as potential microbial base polysaccharide source, has plenty of applications due to its unique physicochemical structure. A Pantoea sp. BCCS 001 GH bacterium with the ability to produce a high amount of EPS was identified by 16S rRNA gene sequencing and biochemical tests. The synthesis of EPS by Pantoea sp. BCCS 001 GH was 13.50 g/L in 48 h when sucrose was used as substrate. The proposed protocol was desirably rapid for massive prodcution of EPS and showed the remarkable impact of sucrose and disodium hydrogen phosphate, peptone, Triton x-100 and 2% (v/v) inoculum size on the yields of EPS production. The EPS was mainly composed of glucose and galactose in a relative molar ration (glucose/galactose) of 85.18:14.82, respectively. The preliminary characterization showed the average molecular- weight of EPS is about 2.522 9 106 Da. The microscopics morphology of polymer was formed irregularly shaped structures.