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The absorption of inorganic sulfate after ingestion was investigated in rats. After oral administration of Na235SO4, 35S radioactivity was measurable in plasma already after 15 min and its plasma concentration reached a peak after about 1.5--2 h. The 35S-radioactivity excreted in urine during 24 h after ingestion of Na235SO4 together with varying amounts of unlabelled Na2SO4 (0.25--5.0 mmol Na2SO4 per rat) indicated an almost complete absorption of inorganic sulfate from the gastrointestinal tract. Determination of the inorganic sulfate concentration in rat serum 2 h after oral administration of 5.0 mmol Na2SO4 revealed a three-fold increase in serum sulfate concentration. The data suggest a rapid and almost complete absorption of inorganic sulfate after oral administration in the rat. Its importance in relation to the sulfate availability for sulfate conjugation of drugs is discussed.
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