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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

On the metabolism of amygdalin. 1. The LD50 and biochemical changes in rats.

The mean lethal dose (LD50) of amygdalin in rats was found to be 880 mg/kg body weight (BW) by oral administration. However, when 600 mg/kg BW was administered orally with beta-glucosidase, all the rats died. Total and Mg ATPase activities of the heart decreased with increasing levels of administered amygdalin. When 200 mg/kg BW amygdalin was administered 2.3 mg (11.7% of the dose) was excreted intact over 48 h. Amygdalin, 7.4 mg (18.5% of the dose) was excreted when the dose was 400 mg/kg BW, while 7.5 mg (12.4% of the dose) was excreted as intact amygdalin when the dosage was increased to 600 mg/kg BW. Thiocyanate excreted within the same 48-h period was 7.0, 9.1, and 9.5 mumol representing 18, 11.2, and 7.8% of the 200, 400, and 600 mg/kg BW oral dosage, respectively. With 300 mg/kg BW amygdalin administered intraperitoneally, 4.1 mg amygdalin and 3.9 mumol thiocyanate representing 13.7 and 6.5% of the dose, respectively, was excreted. Excretion of intact amygdalin and thiocyanate was uniform when the dose was low (200 mg), but with higher doses over 70% of the excreted products were detected in the urine during the first 24 h.[1]


  1. On the metabolism of amygdalin. 1. The LD50 and biochemical changes in rats. Adewusi, S.R., Oke, O.L. Can. J. Physiol. Pharmacol. (1985) [Pubmed]
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