4673. Hetastarch

Nomenclature

CAS number: 9004-62-0
Starch 2-hydroxyethyl ether; hydroxyethyl starch; HES; 6-H.E.S. (Morishita); Hespan (BMS); Hespander (Kyorin); Hestar (Pisa); Plasmasteril (Fresenius).

Description and references

A starch derivative of undetermined exact composition. Comprised of more than 90% amylopectin and etherified to the extent that an average of 7 to 8 of the OH groups present in every ten d-glucopyranose units of the polymer have been converted to OCH2CH2OH groups. Preparation by treating starch with pyridine and ethylene chlorohydrin: Mima, Yokoyama, JP 70 6556 (1970 to Green Cross), C.A. 73, 36822r (1970). Structure evaluation studies: Banks et al., Br. J. Pharmacol. 47, 172 (1973). Physicochemical and biological properties: Tamada et al., Chem. Pharm. Bull. 19, 286 (1971); Banks et al., Staerke 24, 181 (1972). Pharmacology: Irikura et al., Oyo Yakuri 6, 985 sqq (1972). Metabolism: Bogan et al., Toxicol. Appl. Pharmacol. 15, 206 (1969); Ryan et al., Xenobiotica 2, 141 (1972). Toxicity studies: Irikura et al., Oyo Yakuri 6, 1023 (1972). Introduction as a plasma expander: Wiedersheim, Arch. Int. Pharmacodyn. 111, 353 (1957). Review of production and uses: Hjermstad, Starch Chem. Technol. 2, 423-432 (1967).

Chemical structure

Properties

White powder. Very sol in water. Insol in alcohol.

Derivative

Amylopectin derivative.

Properties

The sequence is frequently interrupted by a unit in which R′ is the residue of an additional O-hydroxyethylated α-d-glucopyranosyl moiety that constitutes the first unit in a branch or sub-branch of the polymer.

Use

Cryoprotective agent for erythrocytes.

Therapeutic Category

Plasma volume expander.

Therapeutic Category (Veterinary)

Plasma volume expander.

Keywords

Plasma Volume Expander