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US 5,473,062 AGranted
Process for producing purified xanthan gum
AssigneeTakeda Chemical Industries, Ltd.
InventorsAkira Haze, Kunihiro Ito, Norio Okutani
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Abstract
There is disclosed a process for producing purified xanthan gum, which comprises (i) adding a hydrophilic organic solvent to an aqueous solution containing crude xanthan gum with pH 0.5 to 2.5, and (ii) neutralizing the mixture with a base to precipitate the xanthan gum. The xanthan gum thus obtained has low contents of ash and remaining organic solvent, as well as a high quality with little impurities, and can advantageously be used in the fields of foods, cosmetics, medicaments and the like.
Claims3
A process for producing purified xanthan gum, comprising:
- (i) providing an aqueous solution containing crude xanthan gum, the concentration of the crude xanthan gum in the aqueous solution being 0.5 to 4% w/v, the pH of the aqueous solution being 0.5 to 2.5;
- (ii) adding a hydrophilic organic solvent to the aqueous solution containing the crude xanthan gum, the hydrophilic organic solvent being added in a 1.5-fold to 6-fold amount (v/v) based on the aqueous solution containing the crude xanthan gum, the hydrophilic organic solvent being added such that substantially all of the crude xanthan gum is maintained in solution;
- and
- (iii) neutralizing the solution from step (ii) with a base to precipitate purified xanthan gum, the pH at neutralization being 5 to 8.
1 more element
Dependencies are inferred from the claim text.