Vinod Kumar Gupta

TL;DR: In this paper, a solvent-and catalyst-free reaction between 5,5-dimethyl-1,3-cyclohexanedione (dimedone), an aryl aldehyde and an isocyanide under microwave irradiation is presented.

TL;DR: In this article , physicochemical characteristics of prepared flavoured yoghurt in comparison with the market yoghur after storage at 5°C for 7 days was studied and morphological and biochemical tests were performed for identification of probiotic Lactobacillus acidophilus and Lactebacillus bulgaricus isolated from curd.

Abstract: PVC based membrane containing dicyclohexano-18-crown-6 (I) as active material along with sodium tetraphenyl borate (NaTPB) as an anion excluder and dibutyl phthalate as solvent mediator in the ratio 20:4:150:150 (w/w) (I–NaTPB–DBP–PVC) exhibits good properties with a Nernstian response of 29.0 1.0 mV per decade of activity and a working concentration range of 2.1 × 10 −5 –1.0×10 − 1 M. The working pH range of the sensor is 1.9–7.0. It exhibits a fast response time as fast as 17 s and has a lifetime of about 6 months. The proposed sensor has good selectivity for cadmium over alkali, alkaline earth, some transition and heavy metal ions. The sensor works satisfactorily in mixtures having 10% (v/v) non-aqueous content without showing any considerable change in working concentration range or slope. It has been successfully used as an indicator electrode for the potentiometric titration of Cd 2 + against EDTA as well as for its determination in wastewaters. © 2002 Published by Elsevier