In vitro availability of calcium from sources of cellulose,methylcellulose, and psyllium |
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| Affiliation: | 1. Water Resources and Environmental Engineering, University of Oulu, P.O. BOX 4300, FI 90014, Finland;2. Finnish Environment Institute (SYKE), Paavo Havaksentie 3, FI-90570 Oulu, Finland;1. Department of Obstetrics and Gynecology, Rambam Medical Center, Haifa, Israel;2. Department of Obstetrics and Gynecology, Hillel Yaffe Medical Center, Hadera, Israel;3. Department of Obstetrics and Gynecology, Harbor–University of California, Los Angeles Medical Center, Torrance, CA;1. Department of Obstetrics and Gynecology, Rambam Medical Center, Haifa, Israel;2. Department of Obstetrics and Gynecology, Sheba Medical Center, Tel Hashomer, Israel;3. Department of Obstetrics and Gynecology, Harbor-UCLA Medical Center and Los Angeles Biomedical Institute, Torrance, CA, United States;1. CIMJECT Laboratory, Department of Mechanical Engineering, Federal University of Santa Catarina, 88040-900 Florianópolis, SC, Brazil;2. Biomechanics Engineering Laboratory, University Hospital (HU), Federal University of Santa Catarina, 88040-900 Florianópolis, SC, Brazil;3. Dipartimento di Chimica, Materiali ed Ingegneria Chimica “G. Natta”, Politecnico di Milano, Edificio 6, Piazza L. da Vinci 32, 20133 Milano, Italy;1. Department of Preventive Dentistry, Osaka University Graduate School of Dentistry, Japan;2. Institute of Health Sciences, Ezaki Glico Co., Ltd., Japan;3. Japan Synchrotron Radiation Research Institute, Japan |
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| Abstract: | Certain types of dietary fibres may decrease the amount of dietary calcium available for absorption. The objective of this study was to determine the in vitro calcium availability from sources of cellulose, methylcellulose, and psyllium, such as cereals, fibre supplements, and purified fibres. Total dietary fibre, soluble and insoluble dietary fibre, acid detergent fibre, neutral detergent fibre, cellulose, hemicellulose, lignin, protein, uronic acid, phytate, water holding capacity, and total endogenous calcium content were determined. Results from the chemical analyses of the fibre sources varied significantly. Free endogenous calcium, at pH 3–8, was determined via gel filtration. Calcium was added to each fibre source and free exogenous calcium was determined via gel filtration at pH 1 and pH 8. The analysis of variance procedure was used to determine differences in binding capacities of the fibres. There was virtually no binding of exogenous calcium by sources of cellulose, methylcellulose, or psyllium. |
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