[Thin-layer chromatographic technic for the semiquantitative determination of hydroxyzine residues in animal material]. / Dünnschichtchromatographisches Verfahren zur semiquantitativen Bestimmung von Hydroxyzinrückständen in tierischem Material.

The solution behaviour of hydroxyzine in water and chloroform (in the strongly alkaline and the strongly acidic range) is utilized to extract it from animal material and to purify the extract. A concentration of 0.01 p.p.m. is detectable in liver, kidneys and muscular substance. 0.05 p.p.m. may be determined semiquantitatively by visual spot comparison. In milk, the detectable amount is 0.1 p.p.m. and 0.5 p.p.m. can be determined semiquantitatively. The recoveries of low concentrations of hydroxyzine are likely to be lower in milk samples than in organ samples.

[In-vitro studies on the break-down of chlormequat (chlorcholinchloride) in the rumen]. / In-vitro-Untersuchungen zum Abbau von Chlormequat (Chlorcholinchlorid) im Pansen

Under anaerobic conditions chlormequat did not undergo microbial breakdown in samples of rumen contents or rumen juice. Comparison with other forms of microbial breakdown of chlormequat, such as in soil, showed that oxidative processes were responsible.