Sphinx (Afterlife)
Ex-Bluelighter
Can anyone tell me anything about this stuff??
N&PD Moderators: Skorpio | someguyontheinternet
Chloral Hydrate, Chlorobutanol and Alpha-Chloralose are almost the same thing.
Chlorobutanol and Alpha-Chloralose are metabolites of Chloral Hydrate. (or Cholral Hydrate is the metabolite of Chlorobutanol and A-Chloralose)
http://www.rxlist.com/cgi/generic3/chloralhyd_cp.htmChloral hydrate is readily absorbed from the gastrointestinal tract following oral administration; however, significant amounts of chloral hydrate have not been detected in the blood after oral administration. It is generally believed that the central depressant effects are due to the principal pharmacologically active metabolite trichloroethanol, which has a plasma half- life of 8 to 10 hours. A portion of the drug is oxidized to trichloroacetic acid (TCA) in the liver and kidneys; TCA is excreted in the urine and bile along with trichloroethanol in free or conjugated form.
http://www.ncbi.nlm.nih.gov/entrez/...d&dopt=Abstract&list_uids=9522024&query_hl=19The relative bioavailability and pharmacokinetics of chloral hydrate and its metabolites
Two open, randomized cross-over trials were performed in 18 healthy volunteers each to evaluate the relative bioavailability and the pharmacokinetics of chloral hydrate (CAS 302-17-0), the active ingredient of Chloraldurat 500 (immediate release capsules, CH), Chloraldurat rot (immediate release capsules, CR) and Chloraldurat blau (enteric-coated modified release capsules, CB). In the first study the male subjects, aged 21 to 31 years, were randomly given one capsule of CH or 500 mg of chloral hydrate as drinking solution. In the second study the volunteers, aged 20 to 28 years, received either one capsule of CR or one capsule of CB or 250 mg of chloral hydrate as drinking solution. The time of administration was between 6:30 and 7:30 a.m. and the capsules had to be swallowed with 150 ml water. The reference medication consisted of 150 ml drinking solution. The wash out time in both studies was 4 weeks. Prior to the administration and (2, 4, 6, only for CH) 8, 10, 15, 20, 40, 60 min and 1.5, 2, 4, 6, 8, 12, 24, 36, 48, 72, 96, 144, 192, 240 (and 408 only for CR/CB) h afterwards blood samples of 4.5 ml were taken from the antecubital vein. Additional 4.5 ml were drawn before and 10, 20, 40 and 60 min after administration to detect unchanged chloral hydrate. In the second study times of blood sampling were modified up to 4 h after administration due to the estimated later onset of release from CB in comparison to CR. Blood samples were centrifuged within 20 min, the plasma was separated and immediately frozen at -20 degrees C. Due to the extremely short terminal half-life of chloral hydrate its active metabolite trichloroethanol is regarded as the pharmacokinetically relevant parameter for the assessment of the bioavailability of the parent substance. Compared to the reference formulation (drinking solution) the bioavailability of trichloroethanol was 94.8% (CH), 100.7% (CR) and 101.6 (CB), respectively. The maximum plasma concentrations (Cmax) of trichloroethanol were 5176 ng/ml after intake of CH (reference 6131 ng/ml), after intake of CR 3241 ng/ml and CB 3279 ng/ml (reference 2993 ng/ml). Maximum plasma concentrations (tmax) of trichloroethanol were reached after 0.67 h (reference) and after 0.98 (CH), 0.76 (CR) and 2.38 h (CB), respectively. The terminal half-life for trichloroethanol was calculated to be 9.3 to 10.2 h, for the inactive metabolite trichloracetic acid the half-life ranged from 89 to 94 h. Chloral hydrate itself could be detected only 8 to 60 min after application at very low concentrations in some of the plasma samples. It is justified to characterize its bioavailability by the active metabolite trichloroethanol due to the extremely short terminal half-life and high variability of the parent substance.
http://www.ncbi.nlm.nih.gov/entrez/...ed&dopt=Abstract&list_uids=1388448&query_hl=9it led to efforts to establish how chloral hydrate brings about its action. This seems to be through its reduced metabolite, trichloroethanol.
http://www.ncbi.nlm.nih.gov/entrez/...d&dopt=Abstract&list_uids=11834892&query_hl=9Binding of the active metabolite of chloral hydrate, 2,2,2-trichloroethanol, to serum albumin demonstrated using tryptophan fluorescence quenching.
http://www.ncbi.nlm.nih.gov/entrez/...ed&dopt=Abstract&list_uids=1340434&query_hl=3Sedative/hypnotic effects of chloral hydrate in the neonate: trichloroethanol or parent drug?
Although the metabolism and pharmacokinetics of chloral hydrate (CH) have been reported, there have been no attempts to correlate CH or its metabolite, trichloroethanol (TCE) with the sedative or hypnotic effects. In order to determine whether plasma concentrations of CH or TCE reflect the sedative/hypnotic effects, a sedation/agitation scale was developed. Based on the results of the present study, the sedative/hypnotic effects of TCE cannot be ruled out completely. However, in the neonate, the parent drug CH seems to have a more important role than has been previously suggested from human research.
http://www.ncbi.nlm.nih.gov/entrez/...d&dopt=Abstract&list_uids=8652423&query_hl=12Trichloroethanol is not a metabolite of alpha chloralose.
Head space capillary gas chromatography was used to detect alpha chloralose and its potent metabolite, trichloroethanol in clinical and forensic cases. Although alpha chloralose was identified in blood and urine in all cases, trichloroethanol was never detected. In a fatal case the alpha chloralose concentration in blood was 151.3 mg/l. It was concluded that trichloroethanol is not a metabolite of alpha chloralose.
http://www.ncbi.nlm.nih.gov/entrez/...d&dopt=Abstract&list_uids=12091779&query_hl=9Chloral hydrate: a hypnotic best forgotten?
Synthesised by Justin Liebig in 1832 chloral hydrate is one of the oldest synthetic agents. Since 1869 it has been in use for hypnotic or sedative purposes. Chloral hydrate was used a lot from the end of the 19th century to the middle of the 20th century. Since then chloral hydrate has been less frequently in use as a hypnotic. In the 1990's, the principal use of chloral hydrate in pediatrics was the sedation of children for minor surgery during dental or diagnostic procedures. In general practice, it is an analgesia found in topical preparations. It was known as safe and easy to use. Now it is shown to be potentially dangerous (risk of death in case of intoxication) and there is doubt about genotoxicity and carcinogenecity. The pharmacological property was known in 1948 when Butler discovered the principal active metabolite, trichloroethanol. The gastro-intestinal tract rapidly absorbs chloral hydrate after oral or rectal use. The sedative and hypnotic effects appear in 20 to 60 minutes. The main metabolites [trichloroethanol (TCE) and trichloroacetic acid (TCA)] are formed by hepatocytes and erythrocytes. The half-life of chloral hydrate is short (a few minutes), the half lives of the metabolics are longer, 8 to 12 hours for TCE and 67 hours for TCA. The affinity for lipids is high. It is eliminated principally by the kidneys. Its mechanism of action is unknown. It is a depressor of the SNC, and the sedation is attributed to chloral hydrate and the hypnotic effect to TCE. The interactions appear with: alcohol, anticoagulants, amitriptyline and furosemide. The use of flumazenil (a gaba antagonist), in case of intoxication, indicates a possible action of GABA. The posology is usually between 0.5 to 2 g per day. Chloral hydrate is taken during meals to prevent gastric irritation. The main side effects are digestive, cardiologic (risk of rhythm disorder), dermatologic, neuropsychiatric (withdrawn, delusions, hallucination, dependence) and ophthalmologic. Death occurs after absorption of doses of around 10 g of hydrate chloral, some cases were reported with 5 g. The use of hydrate chloral is contra-indicated in cases of gastric ulcers, hepatic insufficiency, porphyry, respiratory insufficiency, association with anticoagulants and hyper sensibility. Nowadays should we be using chloral hydrate in cases of insomnia in adult and older people? A recent preclinical working group of the French Agency for evaluation of medicinal products reassessed the benefit/risk ratio of chloral hydrate. Many references are found about genotoxicity and carcinogenicity in recent literature. In France, since the end of 2000, chloral hydrate has been withdrawn from many medications for external use in dermatology and in stomatology. Chloral hydrate can be used as a pediatric sedative only once in a lifetime. The psychiatric indication for insomnia is no longer justified and especially in older people.
Chloral Hydrate, Chloretone (aka chlorobutanol), and Alpha-Chloralose all metabolise into a common substance: 2,2,2-trichloroethanol which is responsible for the majority (but not all) of the pharmacological action of the parent drugs.
I think 2,2,2-trichloroethane is also metabolised to 2,2,2-trichloroethanol.
fastandbulbous said:If you want to separate out the ferric carbonate, dissolve it in water then filter; ferric carbonate is insoluble (ferric oxide is better known as rust) so the filtrate should be uncoloured & contain only alphachloralose.
http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=7159691&dopt=AbstractThe pharmacokinetics of chlorbutol were studied after oral administration in 4 healthy subjects on two occasions. Following the rapid attainment of peak concentrations, plasma concentrations fell by approximately 50 per cent in 24 h. After the first dose of chlorbutol, the terminal elimination half-life was 10.3 +/-1.3 days (mean +/- S.E.M), the volume of distribution was 233 +/- 141 and the plasma clearance was 11.6 +/- 1.0 ml min-1. The binding to plasma proteins was 57 +/- 3 per cent. In 3 of the 4 subjects, there was a small but significant decrease in the terminal half-life of chlorbutol after the second dose. The mean urinary recovery over 17 days in two of the subjects accounted for only 9.6 per cent of the dose, 7.4 per cent of the total as the glucuronide and sulphate conjugates and 2.2 per cent as unchanged chlorbutol. A significant factor in the elimination of chlorbutol may be its instability under physiological conditions. Its half-life in vitro is 37 days at pH 7.4. The long terminal half-life of chlorbutol makes it unsuitable as a sedative drug because of the considerable accumulation which will occur when the drug is taken in multiple doses.
In addition, alpha-chloralose directly activates GABAA receptors with high potency and efficacy, something not seen with the ether, alkane, and alcohol general anaesthetics analysed in this study. The total pattern of alpha-chloralose activity more closely resembles that of the barbiturates and steroidal anaesthetics