Degradation of Phytate by Wheat Phytase

K.D. BOS

Degradation of Phytate by Wheat Phytase

In: Recent advances of research in antinutritional factors in legume seeds

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K.D. BOS

K.D. BOS TNO-CIVO Institutes, Zeist, Netherlands

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Type:: Chapter

Pages:: 371–373

DOI:: https://doi.org/10.1163/9789004684690_068

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Summary

Rats fed diets containing a highly purified preparation of Glycoprotein II (phaseolin, Gil), the highly antigenic main storage glycoprotein of Phaseolus vulgaris seeds, rapidly lost weight. Total faecal N was elevated and, after correction for normal metabolic N loss, the true N digestibility was only 37%.

In contrast, the true extent of GII breadkown in the small intestine, excised one hour after the rats had been given a single dose of glycoprotein by gastric intubation, was estimated to be 57% by using immunological techniques. The overall digestibility of immunoreactive GII in the gastrointestinal tract, as established from faecal samples, was even higher and amounted to 74%.

The bulk of the N recovered from the small intestine and faeces was not related to GII. Thus, native GII and/or its fragments appeared to stimulate the secretion of endogenous N-containing materials, possibly mucins. Accordingly, based on conventional Kjeldahl N assays alone, in vivo N digestibility estimations in rats fed on diets containing legume seed storage proteins, such as GII, might give erroneously low values. Keywords: Glycoprotein II (phaseolin), gut, digestibility, endogenous N, secretion.

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Recent advances of research in antinutritional factors in legume seeds

Proceedings of the first international workshop on ANF in legume seeds, Wageningen 23-25 nov. '88

E-Book ISBN:: 9789004684690

Publisher:: Wageningen Academic

Print Publication Date:: 01 Jan 1989

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- Life Sciences

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Degradation of Phytate by Wheat Phytase

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Recent advances of research in antinutritional factors in legume seeds

Proceedings of the first international workshop on ANF in legume seeds, Wageningen 23-25 nov. '88

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