Bioassay Techniques for Drug Development by Atta-ur-Rahman, M. Iqbal Choudhary, William J. Thomsen

By Atta-ur-Rahman, M. Iqbal Choudhary, William J. Thomsen

The target of an activity-directed isolation strategy is to isolate bioactive compounds which can offer structural leads of healing significance. the normal technique of drug improvement is lengthy and dear, yet basic and fast bioassays can function the start line for drug discovery. This publication provides more than a few "bench most sensible" bioassay thoughts precious for normal product and pharmaceutical chemists excited by drug discovery and pharmacognosy. nearly all of those bioassays are offered in a step by step structure, in order that they might also be carried out by way of technical group of workers with little history in microbiology, biochemistry or pharmacology.

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SOS chromtest using Escherichia coli K-12 is therefore also a colorimetric assay for detecting genotoxicity of chemicals. This is a modification of the original liquid suspension assay and involves a simple, convenient agar spot test. Since genotoxic agents also induce the production of galactosidase in strain PQ37, it can be detected colorimetrically. , 1986). Materials 1. ) 2. LB Broth 3. 5ml Autoclave * In qualitative tests, a single relatively large (1–10 mg/ ml) concentration of the test sample is used, while in semi-quantitative tests multiple concentrations (100, 30, 10, 3, 1 mg/ml) are employed.

Propidium iodide (PI) assay Thionin, Azure A, and Toluidine Blue O are biomass stains that approach the protein stains in sensitivity. Propidium iodide is a general biomass stain that binds to RNA, DNA, proteins and glycosaminoglycans. Materials 1. Human tumor cell lines H157 and H1299 lung carcinoma, HT-144 malignant melanoma, Zr-75-1 and MCF7 breast carcinoma, SK-CO-1 and SW403 colon carcinoma, SK-OV-3 ovarian carcinoma and HT 1376 bladder carcinoma 2. Tissue culture flasks 25 cm2 3. 96 well microtiter plates 4.

Killie-flsh (Oryzias latipes)+ 2. ) 3. Air pump 4. Pipettes 5. Beakers (200 ml) 6. Incubator 7. Water tank 8. Fish food 9. Test sample (crude extract, pure natural product or synthetic compound) The piscicidal activity assay involves the following steps: 1. 5 cm in length are reared in a water tank and not fed for two days, prior to the test. 2. Various concentrations of test sample in organic solvents such as methanol (5000, 2500, 1000, 500 ppm) are prepared. 3. These solutions are then added to beakers containing 150 ml water and aerated for two days with an air pump before the test.

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