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Dr. J.L. Domingo, Laboratory of Toxicology and Biochemistry, School of Medicine, San Lorenzo 21, E-43201 Reus (Spain) AI(OH)3 Dear Sir, Aluminum (Al) hydroxide and several other Al-containing phosphate-binding agents and antacids are the most important sources of Al for renal patients who cannot excrete absorbed Al and are, therefore, at risk for serious sequelae of Al accumulation and toxicity [1]. In recent years, it has been demonstrated that oral citrate as well as other frequent dietary constituents (e.g., ascorbic, glu-conic, lactic, malic acids) enhance the gastrointestinal absorption of Al [2, 3]. In the present study, we evaluated the effects of concurrent ingestion of citric, ascorbic or lactic acid and Al(OH)3 on the gastrointestinal absorption and retention of Al in uremic rats. These organic factors appear to be of highest clinical importance as they are available in the diet at relatively high concentrations. Also, because citric, ascorbic and lactic acids are considered to be safe, these compounds are widely used as food additives. Four groups of partially (5/6 N) nephrec-tomized rats were given 346 mg Al(OH)3/kg/ day for 10 days by gavage. Simultaneously, animals in three groups received by gastric intubation citric (62 mg/kg/day), ascorbic (56.3 mg/kg/day) or lactic (28.8 mg/kg/day) acids. The fourth group was designated as control group. Urinary Al excretion was measured daily during the entire period of treatment. Ascorbic and citric acids significantly enhanced Al excretion starting on day 6 of treatment. Moreover, citric, ascorbic and 300-, 250

Influence of Citric, Ascorbic and Lactic Acids on the Gastrointestinal Absorption of Aluminum in Uremic Rats