The Fortification of Common Salt with Ascorbic Acid and Iron

M. H. Sayers, S. R. Lynch, R. W. Charlton, T. H. Bothwell, R. B. Walker, P. Mayet

Research output: Contribution to journalArticlepeer-review

26 Scopus citations


Summary. Common salt fortified with ascorbic acid or iron compounds became discoloured on storage, the reaction being accelerated by heat and humidity. Soluble iron compounds such as FeSO4 caused discoloration more readily than insoluble compounds such as ferric orthophosphate (FePO4). Fortification with both ascorbic acid and iron led to more rapid discoloration than fortification with either alone. Colour developed more rapidly in coarse salt than in refined commercial salt, while chemical NaCk developed a faint discoloration only under very hot and humid conditions. Discoloration was inhibited if starch was mixed with the salt: coarse salt mixed with 2.5% starch, 1.25% ascorbic acid and 0.1% iron as FePOI retained an acceptable appearance during storage under subtropical conditions (Durban) for more than I yr. A double isotope red cell utilization method was employed to assess the absorption of iron from maize porridge and from a standard rice meal cooked with fortified salt. The absorption of both the intrinsic food iron and the iron in the fortified salt was increased threefold if the salt contained 50 mg ascorbic acid as well as FePO4. The amount of iron absorbed was similar whether the salt contained 50 mg ascorbic acid and 4 mg iron as FePO4 or 50 mg ascorbic acid and 4 mg iron as FeSO4. It was concluded that crude common salt could be fortified with 0.1% iron as FePO, and 1.25% ascorbic acid and stored under all but the most extreme tropical conditions, provided that 2.5% starch was added to prevent the development of discoloration, and that such fortification would significantly improve the iron nutrition in countries where the staple food is rice or maize.

Original languageEnglish (US)
Pages (from-to)483-496
Number of pages14
JournalBritish Journal of Haematology
Issue number4
StatePublished - Dec 1974

ASJC Scopus subject areas

  • Hematology


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