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The elution profile of A. macracantha gum, Fig. 1,obtained by atmospheric pressure size exclusion chromatography(APSEC), showed many fractions which havetheir characteristic range of elution volume (mL). The firstfraction, constituted by carbohydrate and protein, maycontain the population of the highest molecular weight.The second fraction of higher elution volume may correspondto oligosaccharides linked to peptides. The fractions3 and 4 of relatively low molecular weight contain onlypeptide and carbohydrate, respectively.The gum, after basic hydrolysis, showed a modified elutionprofile, Fig. 2, in comparison with that of the originalgum, Fig. 1. The absence of the fractions 3 and 4 that havehigher elution volume indicates the vulnerability to basichydrolysis of some linkages present in the molecular populations.The peptidic linkages are generally vulnerable tobasic hydrolysis, except those hydroxyproline-O-glycosidiclinkages, that are stable in base, in contrast to other O-glycosylatedhydroxyamino acids such as serine and threoninewhich may undergo b-elimination (Goodrum, Patel, Leykam,& Kieliszewski, 2000; Lamport & Miller, 1971). Thelowest molecular weight fractions (5), Fig. 1, remains afterbasic treatment (2), Fig. 2, which may indicate the presence
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