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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 have
their characteristic range of elution volume (mL). The first
fraction, constituted by carbohydrate and protein, may
contain the population of the highest molecular weight.
The second fraction of higher elution volume may correspond
to oligosaccharides linked to peptides. The fractions
3 and 4 of relatively low molecular weight contain only
peptide and carbohydrate, respectively.
The gum, after basic hydrolysis, showed a modified elution
profile, Fig. 2, in comparison with that of the original
gum, Fig. 1. The absence of the fractions 3 and 4 that have
higher elution volume indicates the vulnerability to basic
hydrolysis of some linkages present in the molecular populations.
The peptidic linkages are generally vulnerable to
basic hydrolysis, except those hydroxyproline-O-glycosidic
linkages, that are stable in base, in contrast to other O-glycosylated
hydroxyamino acids such as serine and threonine
which may undergo b-elimination (Goodrum, Patel, Leykam,
& Kieliszewski, 2000; Lamport & Miller, 1971). The
lowest molecular weight fractions (5), Fig. 1, remains after
basic treatment (2), Fig. 2, which may indicate the presence
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