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Publication Type
Conference Proceedings
Author, Analytic
Dilworth, Lowell L.; Omoruyi, Felix O.; Morrison, Errol Y.; Wheatley, Andrew O.; Asemota, Helen N.
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Paper/Section Title
Blood glucose and some faecal minerals in rats fed phytic acid extract from sweet potato (ipomea batatas)
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Proceedings Title
Annual National Conference on Science and Technology: Science and Technology for Economic Growth and Development: Proceedings of the Seventeenth Annual National Conference on Science and Technology
Date of Meeting
November 19-22, 2003
Place of Meeting
Kingston, Jamaica
Place of Publication
Kingston, Jamaica
Publisher Name
The Scientific Research Council
Date of Publication
2003
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Abstract
To determine the effects of consumption of phytic acid extract from sweet potato (Ipomea batatas) on rats blood glucose levels and the output of some faecal minerals. In this study the effect of cooking on phytic acid levels and the phytic acid to zinc molar ratio, were assessed in three commonly eaten Caribbean tuber crops namely, Yellow yam (Dioscorea cayenensis), Cocoyam (Xanthosoma sp.) and Sweet Potato (Ipomea batatas). Phytic acid was then extracted from Sweet Potato and fed to Wistar rats for three weeks. At the end of this period the animals were sacrificed and blood glucose was determined. Faecal minerals such as zinc, calcium, magnesium and iron were assessed weekly. Faecal magnesium levels increased significantly in the groups fed phytic acid extract for weeks 1 and 2. In week 3, the output of magnesium was significantly higher in the group fed phytic acid extract without zinc supplement. Faecal zinc was significantly higher in the groups fed phytic acid extract compared to the controls in weeks 1 and 2. Supplementation of the diets with both phytic acid extract as well as commercial phytic acid resulted in an increase in the faecal output of iron except for the group which was fed commercial phytic acid plus zinc. There was no significant difference in faecal calcium output throughout the feeding period. All the groups fed phytic acid, or commercial phytic acid, displayed low blood glucose levels compared to their controls. A further lowering of blood glucose was seen in the groups which also had zinc added to their diets. Supplementation of the rat diets with phytic acid extract resulted in a general increase in the output of faecal minerals. In this short-term study, a lowering of blood glucose was observed in all test groups compared to their controls. However the lowering of blood glucose was more pronounced in the groups fed phytic acid extract or commercial phytic acid plus zinc supplement. Phytic acid and zinc supplementation may play a vital role in the control of blood glucose in rats.....
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