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- W2062181940 abstract "Four pectic polysaccharides (AR-2IIa-IId) with anti-complementary activity have been isolated from a hot-water extract of the root of Angelica acutiloba Kitagawa. Each of these polysaccharides contained a large proportion of GalA together with neutral sugars consisting mainly of Rha, Ara, and Gal. Digestion with endo-α-(1→4)-polygalacturonase indicated that AR-2IIa-IIc each contained a large proportion of enzyme-sensitive polygalacturonan regions, and that AR-2IId contained a large proportion of enzyme-resistant regions. When AR-2IId was de-esterified, it became sensitive to the enzyme. These polysaccharides also contained small proportions of enzyme-resistant regions (PG-1) which were rich in neutral sugars. Methylation analysis and base-catalysed β-elimination studies suggested that each PG-1 contained a rhamnogalacturonan moiety in which 2,4-disubstituted Rha was attached to 4-substituted GalA through position 2 of Rha. Carboxyl-reduction and methyl- and de-esterification of these polysaccharides modulated their anti-complementary activities. Digestion with endo-α-(1→4)-polygalacturonase decreased the activities of AR-2IIa and -2IIb, but not those of AR-2IIc and -2IId. Although PG-1 fractions from AR-2IIa-IIc were more active than the original polysaccharides, oligogalacturonide fragments obtained by enzymic digestion had weak or negligible activity. AR-2IIa-IIc expressed their anti-complementary activities mainly via the classical pathway, but AR-2IId and each PG-1 expressed their activities via both the classical and alternative pathways." @default.
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- W2062181940 date "1988-11-01" @default.
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- W2062181940 title "Structure and anti-complementary activity of pectic polysaccharides isolated from the root of Angelica acutiloba Kitagawa" @default.
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- W2062181940 doi "https://doi.org/10.1016/0008-6215(88)84007-2" @default.
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