Mineral binding capacity of insoluble fiber from extruded cereal brans.

Persistent Link:
http://hdl.handle.net/10150/186397
Title:
Mineral binding capacity of insoluble fiber from extruded cereal brans.
Author:
Gualberto, Daisy Gomes.
Issue Date:
1993
Publisher:
The University of Arizona.
Rights:
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Abstract:
Insoluble fiber fractions from raw and extruded oat, rice, and wheat brans were isolated, and phytate removed. Soluble and insoluble fiber contents were determined, and mineral binding studies conducted, in vitro. The objectives of this study were: (1) to determine if extrusion screw-speeds (50, 70, and 100 rotations per minute) affect the brans' IF content, (2) to determine if extrusion screw-speeds (50, 70, and 100 rotations per minute) affect the IF mineral binding capacity, (3) to determine the total binding capacity of the brans' IF fraction, for Cu²⁺, Ca²⁺, and Zn²⁺, after the removal of phytate, (4) to determine if extrusion processing affects the phytate content of the samples. Raw brans served as controls. A twin-screw extruder, model DNDG-62/20 D was used, where die temperatures, and pressure were: 156 to 169°C/36 to 44 bars, for oat bran; 123 to 130°C/6 bars, for rice bran; and 112 to 122°C/2 bars, for wheat bran. It was found that, extrusion screw-speed did not affect the insoluble fiber content of wheat bran, however, a decrease was observed in rice, and oat bran. High screw-speeds led to an increase in the IF content, of oat and rice bran, whereas wheat bran was not affected. Soluble fiber content increased in all brans, which was attributed to a redistribution of the insoluble fiber. Even after phytate removal, the insoluble fiber, from all brans, bound Cu²⁺, Ca²⁺, and Zn²⁺. Oat bran bound more Cu²⁺ than wheat bran, which, bound more than rice bran. The brans bound equivalent amounts of Ca²⁺ and Zn²⁺. Overall, extrusion processing did not affect the brans' insoluble binding fiber capacity, for Cu²⁺, but it seems to have affected the insoluble fiber binding capacity, from rice and oat bran, for Ca²⁺ and Zn²⁺. Extrusion did not affect the brans' phytate content.
Type:
text; Dissertation-Reproduction (electronic)
Keywords:
Dissertations, Academic.; Nutrition.
Degree Name:
Ph.D.
Degree Level:
doctoral
Degree Program:
Nutritional Sciences; Graduate College
Degree Grantor:
University of Arizona
Committee Chair:
Weber, Charles W.

Full metadata record

DC FieldValue Language
dc.language.isoenen_US
dc.titleMineral binding capacity of insoluble fiber from extruded cereal brans.en_US
dc.creatorGualberto, Daisy Gomes.en_US
dc.contributor.authorGualberto, Daisy Gomes.en_US
dc.date.issued1993en_US
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.description.abstractInsoluble fiber fractions from raw and extruded oat, rice, and wheat brans were isolated, and phytate removed. Soluble and insoluble fiber contents were determined, and mineral binding studies conducted, in vitro. The objectives of this study were: (1) to determine if extrusion screw-speeds (50, 70, and 100 rotations per minute) affect the brans' IF content, (2) to determine if extrusion screw-speeds (50, 70, and 100 rotations per minute) affect the IF mineral binding capacity, (3) to determine the total binding capacity of the brans' IF fraction, for Cu²⁺, Ca²⁺, and Zn²⁺, after the removal of phytate, (4) to determine if extrusion processing affects the phytate content of the samples. Raw brans served as controls. A twin-screw extruder, model DNDG-62/20 D was used, where die temperatures, and pressure were: 156 to 169°C/36 to 44 bars, for oat bran; 123 to 130°C/6 bars, for rice bran; and 112 to 122°C/2 bars, for wheat bran. It was found that, extrusion screw-speed did not affect the insoluble fiber content of wheat bran, however, a decrease was observed in rice, and oat bran. High screw-speeds led to an increase in the IF content, of oat and rice bran, whereas wheat bran was not affected. Soluble fiber content increased in all brans, which was attributed to a redistribution of the insoluble fiber. Even after phytate removal, the insoluble fiber, from all brans, bound Cu²⁺, Ca²⁺, and Zn²⁺. Oat bran bound more Cu²⁺ than wheat bran, which, bound more than rice bran. The brans bound equivalent amounts of Ca²⁺ and Zn²⁺. Overall, extrusion processing did not affect the brans' insoluble binding fiber capacity, for Cu²⁺, but it seems to have affected the insoluble fiber binding capacity, from rice and oat bran, for Ca²⁺ and Zn²⁺. Extrusion did not affect the brans' phytate content.en_US
dc.typetexten_US
dc.typeDissertation-Reproduction (electronic)en_US
dc.subjectDissertations, Academic.en_US
dc.subjectNutrition.en_US
thesis.degree.namePh.D.en_US
thesis.degree.leveldoctoralen_US
thesis.degree.disciplineNutritional Sciencesen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.contributor.chairWeber, Charles W.en_US
dc.contributor.committeememberReid, Bobby L.en_US
dc.contributor.committeememberPrice, Ralph L.en_US
dc.contributor.committeememberTinsley, Ann M.en_US
dc.contributor.committeememberRollins, Franklin D.en_US
dc.identifier.proquest9408473en_US
dc.identifier.oclc720424529en_US
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