Determination of some insect repellents in cosmetic products by high-performance thin-layer chromatography.

A simple and reliable thin-layer chromatographic method for the determination of N,N-diethyl-m-toluamide (DEET) and dimethyl phthalate (DMP) in raw material and cosmetic products was developed and validated. A benzene-diethyl ether-cyclohexane (5:3:2, v/v/v) solvent system was used for quantitative evaluation of chromatograms. The chromatographic zones corresponding to the spots of DEET and DMP on the silica gel plates were scanned in the reflectance/absorbance mode at 230 nm.

Detection of acute myocardial infarction in spontaneously hypertensive rats by 99mTc-pyrrolidino methyl tetracycline.

The myocardial infarct induced by isoproterenol in spontaneously hypertensive rats accumulates higher activities of 99mTc-PM tetracycline compared with the cardiac infarct in normotensive rats caused by the same method. The isoproterenol model of the myocardial necrosis was induced in intact rats without opening the thorax and is a convenient method for experimental radioisotope studies.