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- W2107687670 abstract "1. Incubation of beagle hepatic cytosol, under conditions promoting phenylalanine hydroxylase activity, led to the formation of the sulfoxide derivatives of S-carboxymethyl-L-cysteine, N-acetyl-S-carboxymethyl-L-cysteine, S-methyl-L-cysteine and N-acetyl-S-methyl-L-cysteine. Thiodiglycolic acid was not a substrate. Enzyme kinetic parameters (Km, Vmax) were derived indicating S-carboxymethyl-L-cysteine had the greatest clearance; no enantioselective preference was observed for this S-oxygenation reaction. 2. Following oral administration of S-carboxymethyl-L-cysteine to beagle dogs, the parent substance and its sulfoxide were the only compounds identified in the plasma. Pharmacokinetic data have been obtained indicating that the small amount of sulfoxide formed persisted within the body for longer than the parent material, but that the majority of the ingested dose remained in the administered sulfide form. 3. The sulfide moiety within the muco-regulatory drug, S-carboxymethyl-L-cysteine, is thought to be vital as it acts as a free radical scavenger, resulting in the inactive sulfoxide. Additional extensive enyzme-mediated sulfoxidation would decrease the amount of active sulfide available. In the dog this appears to not be an issue, signalling possible exploitation for therapeutic benefit in treating airway disease." @default.
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- W2107687670 date "2015-06-11" @default.
- W2107687670 modified "2023-09-24" @default.
- W2107687670 title "S-carboxymethyl-l-cysteine and it (R/S)-S-oxides in beagle dog plasma and hepatic cytosol" @default.
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- W2107687670 doi "https://doi.org/10.3109/00498254.2015.1042538" @default.
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