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Fractional Extraction and Physico-chemical Characterization of Hemicelluloses and Cellulose from Sugar Beet Pulp by Runcang Sun; Sara Hughes is a Materials Science article available to read on EtoBox.

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Four hemicelluloses and cellulose fractions were extracted with 10% KOH or 7.5% NaOH at 15ЊC for 16 h and with 24% KOH or 17.5% NaOH at 15ЊC for 2 h from defatted, protein and pectin free, lignified or delignified sugar beet pulp (SBP). There was no significant difference in the yield and sugar composition of isolated hemicelluloses and cellulose obtained from four different procedures. 7.5% NaOH extraction at 15ЊC for 16 h from lignified SBP gave a slightly higher yield of hemicelluloses (10.96%), while 24% KOH extraction at 15ЊC for 2 h from delignified SBP produced the highest yield of cellulose (18.35%). Molecular-average weights ranged from 88 850 to 91 330 Da for the hemicelluloses obtained from lignified SBP, and 21 620-21 990 Da for the hemicelluloses isolated from delignified SBP. The neutral sugar composition of the hemicelluloses consisted of glucose, arabinose, galactose, xylose, and minor quantities of rhamnose and mannose. The infrared spectra showed an absorption band at 900 cm 11 , indicating some amounts of b-linked polysaccharides. Besides ferulic and p-coumaric acids, six other phenolics were also identified in the mixture of alkaline nitrobenzene oxidation of as

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Author

Runcang Sun; Sara Hughes

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0144-8617)

Published

1998

Language

EN

Field

Materials Science (Physical Sciences)