Didesmethylchlorpromazine sulfone [gamma-(2-chlorophenothiazinyl-10)-propylamine sulfone] has been isolated from the urine of a patient under continuous chlorpromazine therapy and identified by mass spectrometry. The same compound was present in organs of rats after injection of the corresponding sulfide. The Cl-free analogue, gamma-(phenothiazinyl-10)-propylamine sulfone, was excreted by patients receiving perazine and by a volunteer after ingestion of the primary amine sulfoxide.

Adult↗

PubMedDate not supplied

Phenolic metabolites of chlorprothixene in man and dog.

From urine and feces of dogs and urine of patients given chlorprothixene (CPT) per os, metabolites were extracted without or with enzymatic deconjugation and separated by repeated TLC. Purified compounds were characterized by UV, NMR, and mass spectrometry, by color reactions, and by chemical interconversions. Both species excreted 6- and 7-hydroxy-CPT besides the sulfoxide and demethylated analogues. In urine, the phenols were largely present as conjugates. The major metabolites in dog feces were 5-hydroxy-CPT and its demethylated derivative, whereas 5-hydroxylation was not detected in man. Dog excrete also contained 6-hydroxy-7-methoxy (or 7-hydroxy-6-methoxy)-CPT; further, a 5-hydroxy compound was detected in which the exocyclic double bond was hydrated. In the other metabolites, the Z-configuration of CPT had been retained, but small quantities of E-isomers were formed during isolation. According to preliminary quantitative data, phenols accounted for a small part of extractable metabolites in human urine, whereas they predominated in dog feces.

Animals↗

PubMedDate not supplied

Phenolic metabolites of amitriptyline and nortriptyline in rat bile.

Anesthetized bile fistula rats received amitriptyline (AT), its N-oxide (AT-NO), or nortriptyline (NT) at doses of 72 mumol/kg ip, and bile was collected for 6-9 hr. Isolation of metabolites was achieved by enzymic deconjugation and repeated TLC of extracted aglycones. Purified compounds were characterized by UV, NMR, and mass spectrometry, by color reactions, and by chemical interconversions. Besides the alcohols E-10-hydroxy-AT and 10,11-dihydroxy-AT, the phenol E-2-hydroxy-AT occurred as a major AT metabolite, while 2,10- and 2,11-dihydroxy-AT, 2,10,11-trihydroxy-AT, and 2-hydroxy-3-methoxy (or 3-hydroxy-2-methoxy)-AT were present in smaller quantities. Further minor metabolites were 2-hydroxy-11-oxo-AT, 3-hydroxy-AT, 3,11-dihydroxy-AT, and its dehydration product 3-hydroxy-10,11-dehydro-AT. The exact position of the functional groups was elucidated by the nuclear Overhauser effect (NOE) in NMR spectroscopy and by analyzing metabolite patterns in the bile of rats given E- or Z-10-hydroxy-AT. Administration of AT-NO led to a larger proportion of methylated catechols and a smaller one of 10-hydroxy metabolites. Besides the tertiary amines, rats given AT or AT-NO excreted the demethylated analogues of some of the hydroxylation products. The latter also occurred as metabolites of NT, the ratio of aromatic and aliphatic hydroxylation being lower than with AT or AT-NO. Urine of rabbits treated orally with AT contained mono- and dihydroxylated metabolites resulting from attack at positions 2, 3, 10, and/or 11 and the same methylated catechols as rat bile.

Amitriptyline↗

PubMedDate not supplied

Amitriptyline metabolites in human urine. Identification of phenols, dihydrodiols, glycols, and ketones.

From the urine patients being treated with amitriptyline, drug metabolites were extracted by adsorption to polystyrene. Nonconjugated compounds and aglycones liberated by enzymic hydrolysis were purified separately by repeated TLC and characterized by physicochemical and chemical methods. Besides the known E- and Z-10-hydroxy derivatives of amitriptyline (AT), nortriptyline (NT), and their primary amine analogue, two isomeric 10,11-dihydroxy compounds could be identified in each series. Metabolites with an oxo function in position 10 occurred in minor quantities. The phenols 2-hydroxy-NT and 2,11-dihydroxy-NT, as well as the 1,2-dihydrodiol derived from NT, were regularly present, while the corresponding tertiary amines as well as 3-hydroxy-AT and -NT were detected occasionally in very small amounts.

Amitriptyline↗

PubMedDate not supplied

Glucuronides of hydroxylated metabolites of amitriptyline and nortriptyline isolated from rat bile.

Polar conjugates were isolated from the bile of rats given amitriptyline (AT, unlabeled or labeled with 14C), nortriptyline (NT), or 10-hydroxy (10-OH) derivatives of the drugs. The procedure involved extraction on a column of polystyrene resin, elution with methanol, and separation by preparative TLC followed by reversed phase HPLC. Individual metabolites were characterized by NMR spectroscopy and fast atom bombardment mass spectrometry and by enzymatic or acid deconjugation with subsequent identification of aglycones and glucuronic acid. Conversely, they were compared with conjugates obtained from hydroxy compounds by incubation with rat liver microsomes and UDP-glucuronic acid. Glucuronides isolated from the bile of rats given AT were derived from 2-OH-AT, (E)- and (Z)-10-OH-AT, 2-hydroxy-3-methoxy- (or 3-hydroxy-2-methoxy) AT, 10, 11-(OH)2-AT, and some of the N-demethylated analogues of these compounds. In most cases, 10-OH compounds form two diastereoisomeric glucuronides produced from the enantiomeric alcohols; 10, 11-(OH)2 metabolites occur as cis- and trans-isomers that are conjugated with glucuronic acid. Administration of synthetic (E)- and (Z)-10-OH-AT and -NT leads to the excretion of their glucuronides along with conjugates formed after demethylation and/or introduction of a second OH group. NT gives rise to 2-OH-NT glucuronide besides those conjugates derived from (E)-10-OH-NT. No glutathione conjugates could be detected.

Amitriptyline↗