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• W2023002092 abstract "The scope of circular dichroism (c.d.) in the characterisation of alginate composition and block-structure is assessed. The three types of block present in alginate show very different c.d. behaviour, the spectrum for poly-l-guluronate being entirely negative, whereas that of poly-d-mannuronate has a strong positive band, and mixed sequences show intermediate behaviour. Spectra of intact alginates show a peak at ∼ 200 nm, and a trough at ∼ 215 nm, whose relative magnitudes vary systematically with composition. Simple equations are given for determination of the relative amounts of d-mannuronate and l-guluronate residues from the observed ratio of peak height to trough depth. The method is non-destructive, and reliable estimates of composition can be obtained from < 1 mg of alginate. Mixed blocks give a spectrum which is not identical to that of an equimolar mixture of the two types of homopolymeric block, indicating that c.d. behaviour is also sensitive to the nature of adjacent residues in the polymer chain. Matching of alginate c.d. by linear combination of the spectra for each of the three component structural-sequences, using an iterative, least-squares, computer technique, thus provides a direct index of block composition. The results obtained are in good agreement with previous analyses of the same samples by hydrolysis and n.m.r. spectroscopy." @default.
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• W2023002092 date "1980-05-01" @default.
• W2023002092 modified "2023-10-14" @default.
• W2023002092 title "Characterisation of alginate composition and block-structure by circular dichroism" @default.
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• W2023002092 doi "https://doi.org/10.1016/s0008-6215(00)85661-x" @default.
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