Antioxidant activities of chitobiose and chitotriose.

Abstract:

:Chitooligosaccharides, the oligomers made up of beta-1,4-linked D-glucosamine, are obtained by partial hydrolysis of chitosan, a deacetylation product of chitin. The antioxidant activity of various chitooligosaccharides was tested in vitro with aminoguanidine, pyridoxamine, and Trolox as reference compounds. Hydroxylation of benzoate to salicylate by H2O2 in the presence of Cu(2+) was effectively inhibited by chitobiose, chitotriose, aminoguanidine, pyridoxamine, and Trolox (their IC(50) values=18, 80, 85, 10, and 95 microM, respectively), whereas glucosamine and N-acetylchito-oligosaccharides (di-N-acetylchitobiose and tri-N-acetylchitotriose) did not show any inhibitory activity. Chitobiose and chitotriose were more potent than the 3 reference compounds in scavenging hydroxyl radicals produced by photolysis of zinc oxide: IC(50) values of the 2 oligomers were 30 and 55 microM, respectively. Such a scavenging activity of these 2 chitooligomers was also shown by the use of another system, a mixture of Fe(3+)/EDTA/ascorbate/H2O2, for producing hydroxyl radicals. Only chitobiose and Trolox, of the 10 compounds tested, had the ability to scavenge superoxide radicals generated by a non-enzymatic system using phenazine methosulfate and NADH. Taken together with our unpublished observation that chitobiose and chitotriose are appreciably absorbed from the intestine of rats, the present results suggest that these 2 chitooligosaccharides would act as effective antioxidants in vivo when orally ingested.

journal_name

Biol Pharm Bull

authors

Chen AS,Taguchi T,Sakai K,Kikuchi K,Wang MW,Miwa I

doi

10.1248/bpb.26.1326

subject

Has Abstract

pub_date

2003-09-01 00:00:00

pages

1326-30

issue

9

eissn

0918-6158

issn

1347-5215

journal_volume

26

pub_type

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