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Biomedical subjects

Y Kumar

Publications and source records attributed to Y Kumar.

47 records · Page 3Linked to original sources
PubMed1985

Potential neuroleptic agents. 3. Chemistry and antidopaminergic properties of substituted 6-methoxysalicylamides.

A series of substituted 6-methoxysalicylamides were synthesized from their corresponding 2,6-dimethoxybenzamides by demethylation of one methoxy group with boron tribromide. Substituted 6-methoxysalicylamides having a lipophilic aromatic substituent in the 3-position para with respect to the methoxy group, e.g. a bromo or an iodo atom or an ethyl or a propyl group, and having an (S)-N-(1-alkyl-2-pyrrolidinyl)methyl moiety as the side chain were found to be potent blockers of [3H]spiperone binding in vitro and potent inhibitors of the apomorphine syndrome in the rat. Similar to remoxipride but in contrast to haloperidol, some of the substituted salicylamides show a 10-20-fold separation between the dose that inhibits hyperactivity and that which inhibits stereotypy. It was concluded that, besides the requirement of a lipophilic substituent in the position para to the methoxy group for antidopamine activity in vivo, the formation of a coplanar six-membered pseudoring involving the amide moiety and the methoxy group is a structural requirement for activity in vitro.

Animals↗
PubMed1983

Reverse phase high performance liquid chromatographic determination of Baygon in water.

A simple analytical procedure for determination of Baygon in water is described. The Baygon residues are extracted on a C18 SEP-PAK cartridge and subsequently analyzed by reverse phase high performance liquid chromatography using ultraviolet detection at 272 nm. Water samples spiked with Baygon are found to give greater than 90 percent recoveries. Concentration levels as low as 20 ppb can be easily detected by this method.

Chromatography, High Pressure Liquid↗
PubMed1979

Phototoxicity of chlorpromazine.

The constitution of chlorpromazine has been studied in the context of its phototoxicity. Electron transfer from the side chain to the aromatic nucleus of the drug contributes to its instability to light. Even without the side chain, however, chlorophenothiazines appear to be very photolabile, so that it is unlikely that nonphototoxic analogues of chlorpromazine can be prepared merely by altering the constitution of the side chain.

Chlorpromazine↗
PubMedDate not supplied

Microencapsulation of soluble pharmaceuticals.

A method to microencapsulate water-soluble and liquid-paraffin insoluble drugs into spherical, discrete and free-flowing particles of approximately 175 microns size with excellent yield has been described taking diethylcarbamazine citrate as a model drug. In this method a gelatin-drug dispersion at 50 degrees C is sprayed, using a simple apparatus designed in our laboratory, into chilled, dry liquid paraffin present in a china dish previously coated with a layer of hard paraffin and maintained at 5 degrees C. After allowing the droplets to gel at 5 degrees C for an hour, water was removed by freeze drying. Later liquid paraffin adhering to freeze-dried microcapsules was removed by washing with chilled, dry acetone. Various factors affecting the yield, size, shape and size distribution of microcapsules were optimized.

Diethylcarbamazine↗