Abstract
An experimental statistical design was used to determine pH and temperature optima for growth and polymer production by Xanthomonas campestris. A pH between 6·0-7·5 and a temperature between 25–27°C were optimal for growth. While for xanthan production and broth consistency index, the pH and temperature optimal ranges were between 7·0-8·0 and 25–30°C, respectively. At these optimal ranges a cell concentration of 3·2 g litre −1, polysaccharide concentration of 17·7 g litre −1 and a consistency index of 100 mPa s 11 was obtained.
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