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The effects of various deacetylation procedures on the nylon bag digestibility of barley straw and of grass cell walls recovered from sheep faeces

Published online by Cambridge University Press:  27 March 2009

J. S. D. Bacon  and
A. H. Gordon
J. S. D. Bacon
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen AB2 9SB
A. H. Gordon
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen AB2 9SB
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Summary

Two poorly digested materials, barley straw and grass cell wall residues recovered from sheep faeces, were treated with sodium ethoxide, methoxide or hydroxide under various conditions and the effects on their digestibilities studied by the nylon bag technique in the sheep rumen.

Acetyl groups were removed during these treatments and the degree of deacetylation could be controlled by adjusting the amounts of reagents used, about 25 m-mole of base/g being required to produce the maximum effect. Sodium ethoxide in ethanol was the least effective of the reagents used: it did not remove acetyl groups from barley straw and left a larger proportion untouched in faeces cell walls than did sodium methoxide in methanol.

Irrespective of the reagent employed digestibility increased with the progress of deacetylation and the two processes reached a maximum together, but there was not a linear relation between acetyl content and digestibility. In the case of straw treated with sodium hydroxide there appeared to be a linear relationship between digestibility and the amount of reagent applied, up to 20 m-moles/g straw.

Phenolic ester groups were less susceptible to the reagents tested than acetyl groups. It is concluded that the action of the basic reagents is probably upon polysaccharides other than cellulose, that access to some regions of the cell walls may be limited by the solvent present, and that the linkages that restrict digestibility have a sensitivity to basic reagents similar to that of the acetyl ester groups present.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 94 , Issue 2 , April 1980 , pp. 361 - 367
Copyright
Copyright © Cambridge University Press 1980

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References

Bacon, J. S. D. (1979). What is straw decay? Some retrospective comments. In Straw Decay and its Effect on Disposal and Utilization (ed. Grossbard, E.), pp. 227–236. London: John Wiley.Google Scholar
Bacon, J. S. D. & Gordon, A. H. (1975). Comparisons of walls derived from different cell types in grasses. Journal of the Science of Food and Agriculture 26, 1434.Google Scholar
Bethge, P. O. & Lindstrom, K. (1973). Determination of O-acetyl groups in wood. Svensk Papperstidning 76, 645–649.Google Scholar
Block, B. J. & Bolling, D. (1951). The amino acid composition of proteins and foods, 2nd edn, p.54. Springfield, Illinois: C. C. Thomas.Google Scholar
Gordon, A. H., Hay, A. J., Dinsdale, D. & Bacon, J. S. D. (1977). Polysaccharides and associated components of mesophyll cell walls prepared from grasses. Carbohydrate Research 57, 235–248.CrossRefGoogle Scholar
Hartley, R. D. & Jones, E. C. (1978). Effect of aqueous ammonia and other alkalis on the in-vitro digestibility of barley straw. Journal of the Science of Food and Agriculture 29, 92–98.CrossRefGoogle Scholar
Jackson, M. G. (1977). The alkali treatment of straws. Animal Feed Science and Technology 2, 105–130.CrossRefGoogle Scholar
Jackson, M. G. (1978). Treating straw for animal feeding: an assessment of its technical and economic feasibility. FAO Animal Production and Health Paper 10. Rome: Food and Agriculture Organisation of the United Nations.Google Scholar
Jarvis, M. C, Threlfall, D. R. & Friend, J. (1978). Alkali-labile bonds in the potato cell wall. Biochemical Society Transactions 6, 391–392.CrossRefGoogle ScholarPubMed
Monro, J. A., Penny, D. & Bailey, R. W. (1976). The organisation and growth of primary cell walls of lupin hypocotyl. Phytochemistry 15, 1193–1198.CrossRefGoogle Scholar
Morris, E. J. & Bacon, J. S. D. (1977). The fate of acetyl groups and sugar components during the digestion of grass cell walls in sheep. Journal of Agricultural Science, Cambridge 89, 327–340.CrossRefGoogle Scholar
Warwicker, J. O., Jeffries, R., Colbran, R. L. & Robinson, R. N. (1966). A review of the literature on the effect of caustic soda and other swelling agents on the fine structure of cotton. Shirley Institute Pamphlet no. 93. Manchester: The Cotton Silk and Man-made Fibres Research Association.Google Scholar