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Comparative analysis of influence of promoters and inhibitors on in vitro available iron using two methods.

Abstract

The investigation was undertaken with the objective of comparing two in vitro techniques, measuring dialyzable iron (method A) and measuring ionizable iron (method B), for iron bioavailability in a model system. The effect of the time of introduction of the additives on the available iron was also determined. FeSO4 solution was used as the reference source of iron, to which a series of enhancers (ascorbic acid, citric acid, maleic acid and tartaric acid) and inhibitors (tannic acid, calcium oxalate, oxalic acid, calcium carbonate and sodium phytate) were added individually at various concentrations, and available iron was estimated. From FeSO4 solution, 0.1% (method A) and 3.9% (method B) of iron was available. The addition of ascorbic acid, citric acid and tartaric acid increased this by 33-50%, 28-57% and 23-90%, respectively, for method A and by 15-89%, 24-78% and 24-93% for method B. Tannic acid, sodium phytate and calcium oxalate exhibited an inhibitory effect irrespective of the concentrations, while oxalic acid and calcium carbonate exhibited a dose-dependent inhibitory pattern. The iron availability analyzed by both methods showed a positive correlation with seven out of nine additives. An inverse relation was seen between the inhibitory effect of calcium carbonate and calcium oxalate and their time of introduction into the system. The overall observations showed that although absolute values varied widely, a positive correlation existed between the methods.

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  • Authors+Show Affiliations

    ,

    Department of Studies in Food Science and Nutrition, Manasagangothri, University of Mysore, Mysore, India.

    ,

    Source

    MeSH

    Ascorbic Acid
    Calcium Carbonate
    Calcium Oxalate
    Citric Acid
    Dialysis
    Dietary Supplements
    Digestion
    Ferrous Compounds
    Humans
    Iron
    Maleates
    Models, Biological
    Oxalic Acid
    Phytic Acid
    Tannins
    Tartrates

    Pub Type(s)

    Comparative Study
    Journal Article
    Research Support, Non-U.S. Gov't

    Language

    eng

    PubMed ID

    17162335

    Citation

    Jyothi Lakshmi, A, et al. "Comparative Analysis of Influence of Promoters and Inhibitors On in Vitro Available Iron Using Two Methods." International Journal of Food Sciences and Nutrition, vol. 57, no. 7-8, 2006, pp. 559-69.
    Jyothi Lakshmi A, Gupta S, Prakash J. Comparative analysis of influence of promoters and inhibitors on in vitro available iron using two methods. Int J Food Sci Nutr. 2006;57(7-8):559-69.
    Jyothi Lakshmi, A., Gupta, S., & Prakash, J. (2006). Comparative analysis of influence of promoters and inhibitors on in vitro available iron using two methods. International Journal of Food Sciences and Nutrition, 57(7-8), pp. 559-69.
    Jyothi Lakshmi A, Gupta S, Prakash J. Comparative Analysis of Influence of Promoters and Inhibitors On in Vitro Available Iron Using Two Methods. Int J Food Sci Nutr. 2006;57(7-8):559-69. PubMed PMID: 17162335.
    * Article titles in AMA citation format should be in sentence-case
    TY - JOUR T1 - Comparative analysis of influence of promoters and inhibitors on in vitro available iron using two methods. AU - Jyothi Lakshmi,A, AU - Gupta,Sheetal, AU - Prakash,Jamuna, PY - 2006/12/13/pubmed PY - 2007/7/24/medline PY - 2006/12/13/entrez SP - 559 EP - 69 JF - International journal of food sciences and nutrition JO - Int J Food Sci Nutr VL - 57 IS - 7-8 N2 - The investigation was undertaken with the objective of comparing two in vitro techniques, measuring dialyzable iron (method A) and measuring ionizable iron (method B), for iron bioavailability in a model system. The effect of the time of introduction of the additives on the available iron was also determined. FeSO4 solution was used as the reference source of iron, to which a series of enhancers (ascorbic acid, citric acid, maleic acid and tartaric acid) and inhibitors (tannic acid, calcium oxalate, oxalic acid, calcium carbonate and sodium phytate) were added individually at various concentrations, and available iron was estimated. From FeSO4 solution, 0.1% (method A) and 3.9% (method B) of iron was available. The addition of ascorbic acid, citric acid and tartaric acid increased this by 33-50%, 28-57% and 23-90%, respectively, for method A and by 15-89%, 24-78% and 24-93% for method B. Tannic acid, sodium phytate and calcium oxalate exhibited an inhibitory effect irrespective of the concentrations, while oxalic acid and calcium carbonate exhibited a dose-dependent inhibitory pattern. The iron availability analyzed by both methods showed a positive correlation with seven out of nine additives. An inverse relation was seen between the inhibitory effect of calcium carbonate and calcium oxalate and their time of introduction into the system. The overall observations showed that although absolute values varied widely, a positive correlation existed between the methods. SN - 0963-7486 UR - https://www.unboundmedicine.com/medline/citation/17162335/Comparative_analysis_of_influence_of_promoters_and_inhibitors_on_in_vitro_available_iron_using_two_methods_ L2 - http://www.tandfonline.com/doi/full/10.1080/09515070601043328 DB - PRIME DP - Unbound Medicine ER -