Direct determination of propoxur in plant tissues by gas chromatography with an alkali flame-ionization detector

Chemicals/CAS: propoxur, 114-26-1.

Pitfalls in determination of acetylcholine from brain by pyrolysis gas chromatography/mass spectrometry

Demethylation by sodium benzenethiolate has been used to analyse mixtures of isotopic variants of acetylcholine (ACh) by gas chromatography/mass spectrometry (GC/MS). The present experiments show that demethylation by pyrolysis is also suitable for the simultaneous determination of deuterium labelled variants of ACh by means of GC/MS. However,...

Characterization of the components of technically polychlorinated biphenyl mixtures-II

The influence of several sterols on the conversion of β-sitosterol into cholesterol in the cockroach

Chemicals/CAS: carbon, 7440-44-0; cholesterol, 57-88-5; Carbon Isotopes; Cholesterol, 57-88-5; Sterols

Identification and toxicological evaluation of chlorinated dibenzofuran and chlorinated naphthalene in two commercial polychlorinated biphenyls

In a previous study (Vos & Koeman, Toxic. appl. Pharmac. 1970. In press) a significant difference in toxicity was found between three commercial polychlorinated biphenyl (PCB) preparations, high mortality, liver necrosis and chick oedema-like lesions being associated with only two of the compounds tested. In the present study, column and gas...

Chlorinated biphenyls in fish, mussels and birds from the river rhine and the netherlands coastal area

Polychlorinated biphenyls are widely used in industry, and they are now making an appearance in the world's wildlife. Besides being a hazard in their own right, they interfere with the detection of organochlorine insecticides such as DDT. © 1969 Nature Publishing Group. Chemicals/CAS: liver extract, 72980-85-9; tissue extract, 1390-94-9, 8001-49...