High temperature gelling starch derivatives

Details High temperature gelling starch derivatives High temperature gelling starch derivatives

C - Chemistry, Metallurgy

08

B

99/169, 260/221

C08B 31/00 (2006.01) A23L 1/195 (1985.01)

Patent

CA 1236455

ABSTRACT OF THE DISCLOSURE Starch derivatives capable of forming reversible gels are provided. Aqueous dispersions or solutions of the derivatives form thermally reversible hot gels at temperatures above 70°C. and a pH of 3-8, in addition to exhibiting substantial increases in viscosity upon cooling from 95° to 70°C. The starch derivative may be alkali gelatinized at a pH 13 or above and the gel formed at a pH of from 1-10. The gelling agents are starch ethers or starch esters having an amylose content of at least 17% by weight with the ether or ester substituent comprising a linear saturated or unsatu- rated hydrocarbon chain of at least 12 carbon atoms. An improved process for preparing the starch half-acid esters in the presence of a phase transfer agent is described.

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