PubMed · 17180953
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Anke Schaefer. 2006-12-01. Barbiturates' environmental legacy.. https://pubmed.ncbi.nlm.nih.gov/17180953/
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Barbiturates have been widely used as sedative hypnotics in the mid-1960s and since then mainly as veterinary drugs. To monitor their presence and fate in the aquatic environment, a method based on gas chromatography-mass spectrometry (GC-MS) has been developed to quantify butalbital, secobarbital, hexobarbital, aprobarbital, phenobarbital, and pentobarbital, all with a limit of detection (LOD) down to 1 ng/L. From the various investigated waste and surface water samples, barbiturates were only, but regularly detected in the Mulde, a tributary of the river Elbe in Germany at relevant concentrations up to several microg/L. Investigations of groundwater being affected with wastewater infiltration several decades ago also revealed a barbiturate pattern, indicating a strong recalcitrance of these drugs. To confirm this hypothesis, studies were carried out on biotic and abiotic degradation. Both, the biodegradability under aerobic conditions and hydrolysis did not show any degradation, implementing, that the investigated barbiturates, once released into the aquatic environment, show high stability over a long period of time.
A set of racemic N-alkylated barbiturates were investigated for their direct enantioselective HPLC separation on a new chiral stationary phase (CSP) containing cellulose tris(3,5-dimethylphenylcarabamate) immobilized onto silica gel (Chiralpak IB) and its coated version (Chiralcel OD). They were online detected by UV and optical rotation detectors to trace the elution order of their enantiomers. Surprisingly, examples of false and true reversal of the elution order of enantiomers of barbiturates were observed and reported.
OBJECTIVE: To provide insight into the relationship between the drugs used for euthanasia and its notification. DESIGN: Retrospective and descriptive. METHODS: By comparing the drugs used for euthanasia according to different components of studies carried out in 1990, 1995 and 2000, insight was obtained into the drugs used in all cases of euthanasia satisfying the definition thereof (death-certificate studies), those cases of euthanasia that, in addition, were defined as such by the physician (physician interviews), and the cases of euthanasia that, in addition, had been reported (reported case studies). RESULTS: In 2001, standard drugs for euthanasia were used in 76% of cases and opioids in 23%. Euthanasia with standard drugs was reported in 73% of cases in 1995, and in 71% of cases in 2000, while euthanasia with opioids was reported in 2% and 1% of cases, respectively. The total percentage of euthanasia reported was higher in 2001 than in 1995 (54% versus 44%), since in 2001 euthanasia was apparently performed more often with standard drugs and less with opioids. CONCLUSION: An increasing proportion of cases of euthanasia is being carried out with the drugs recommended for this purpose. Euthanasia with opioids was rarely reported. Possibly, physicians did not always consider these cases to be euthanasia.