Design, Synthesis and Evaluation of the Biological Activities of Some New Carbohydrazide and Urea Derivatives

Objectives

Urea and carbohydrazide derivatives are important compounds exhibiting cytotoxic activities. In this study, a series of new urea and carbohydrazide derivatives containing an pyridine ring were synthesized and evaluated for cytotoxic activity.

Materials and Methods

The proposed structures of the synthesized compounds were confirmed using elemental analysis, IR, and ¹H-NMR spectroscopic techniques. The cytotoxic potencies of synthesized compounds were determined using a 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay (MTT) on BRCA mutant-carrying HCC1937 and Capan-1 cell lines, as well as on MCF7, HeLa, and MRC5 cells.

Results

3a, 3b, 3c and 3d showed cytotoxic activity against all cancer cell lines.

Conclusion

Our data indicate that compounds 3a-d are more selective to cancer cells compared with nontumoral fibroblasts; however, these compounds are not more potent on HR defective cells with BRCA mutants.

An high performance liquid chromatographic method for the quantification of cotinine in the urine of preschool children

Tobacco smoke exposure is an important and preventable cause of morbidity among children. Enviromental tobacco smoke (ETS) increases respiratory symptoms and disease and also decreases lung function in children who live in a household with at least one smoker. We have developed a simple and reliable HPLC method with diode array dedection to determine the urine concentrations of cotinine in children aged 3 to 6 years, exposed to ETS. The assay involved a liquid-liquid extraction with chloroform. The HPLC method utilized a Chromasil C18 column (150 mm x 4.6 mm i.d.) and an isocratic mobile phase of phosphate buffer: acetonitrile (83:17 v/v, 0.02 M containing 0.1% triethylamine, adjusted to pH 6.72 with orthophosphoric acid), at a flow rate of 0.7 ml min(-1). The detection was performed at 260 nm and the total analysis time of analysis was less than 15 min. Linearity ranged from 0 to 80 microg L(-1); correlation coefficients (r2) for calibration curves were greater than 0.99. With 2 mL of urine for extraction, the limit of detection was 0.1 microg L(-1). The mean extraction ratio of cotinine was 88.78%. This analytical method is suitable for the determination of cotinine levels in a large number of urine samples.