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Mineral composition of isolated fibre fractions from artichoke and the effect of phosphate buffer on its structure and mineral content |
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| Authors: | G López G Ros F Rincón MJ Periago MC Martínez J Ortuño |
| Affiliation: | a Department of Food Science, Veterinary Faculty, University of Murcia, Campus de Espinardo, 30071-, Murcia, Spain b Department of Food Science and Technology, Edificio C, Campus de Rabanales, University of Córdoba, 14005-, Córdoba, Spain |
| Abstract: | Soluble and insoluble dietary fibre of artichoke heart were extracted in water and phosphate buffer to determine their mineral contents and to evaluate the effect of the extraction medium on fibre structure (studied by scanning electron microscopy) and mineral composition (determined by X-ray microanalysis and atomic absorption spectrophotometry). The undialysed soluble dietary fibre extracted with phosphate buffer showed a different structural organisation from that extracted with water. X-Ray microanalysis of both soluble fractions showed some differences between the Na, K, Ca and P contents, and also between the Na contents of the insoluble fractions. However, when the samples were dialysed, differences in morphology and structure between the soluble fractions were not observed. A study of the mineral composition by atomic absorption showed differences between both soluble fractions and both insoluble fractions as regards Na, Ca, Mg and Fe. |
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