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  • Title: Influence of milk and food on fluoride bioavailability from NaF and Na2FPO3 in man.
    Author: Trautner K, Einwag J.
    Journal: J Dent Res; 1989 Jan; 68(1):72-7. PubMed ID: 2910959.
    Abstract:
    Aqueous solutions of NaF and sodium monofluorophosphate (MFP) were given to fasting young adults in an intra-individual cross-over study. Plasma fluoride (F) levels were measured by use of a F-ion-sensitive electrode, and eight-hour profiles of F concentrations in plasma were determined. F availability and pharmacokinetic data were identical for both substances. Furthermore, the same subjects were given tablets containing 2 mg F, either as NaF or as MFP, under different experimental regimens: (a) on a fasting stomach, (b) together with milk, or (c) together with breakfast and milk. Equal F availabilities were observed for both substances. Plasma peak levels were reduced when the tablets were taken together with food. Intake of milk reduced F availability by 30% compared with the fasting stomach experiment; this effect was abolished when milk was taken as part of the breakfast. It is suggested that formation of Ca salts and entrapment of F in coagulation products of milk are important factors causing reduction of F availability, and that prolonged stay of the chyme after concomitant ingestion of food allows F to become liberated from bound forms and coagulation products by digestion processes.
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