Showing papers by "Anju Chadha published in 2005"
TL;DR: Important fuel properties of methyl esters of Pongamia oil (Biodiesel) compare well with ASTM and German biodiesel standards.
558 citations
TL;DR: Candida parapsilosis ATCC 7330 was found to be an efficient biocatalyst for the deracemisation of aryl α-hydroxy esters (65–85% yield and 90–99% ee).
46 citations
TL;DR: In this paper, a silicon nitride-based EISCAP was used for the first time to detect triglycerides and urea, and the sensor was able to detect millimolar concentrations of the bioanalytes (tributyrin/urea).
Abstract: We report fabrication of a potentiometric biosensor on silicon for the estimation of tributyrin and urea based on enzymatic reactions. The sensor is an electrolyte–insulator–semiconductor capacitor (EISCAP) that shows a shift in the measured C–V with changes in the pH of the electrolyte. This pH shift can be induced by the enzyme-mediated hydrolysis of tributyrin and urea which results in acidic and basic solutions, respectively and an EISCAP can be effectively used for the detection of these bioanalytes. A silicon nitride based EISCAP was used for the first time to detect triglycerides and urea. The sensor was able to detect millimolar concentrations of the bioanalytes (tributyrin/urea). The most important features of the tributyrin and urea sensor are high sensitivity, long life-time, easily built at a low cost, micro-construction and short response time. Optimization of the conditions for the enzymatic reaction and calibration of the sensor are included.
42 citations
TL;DR: The absolute configuration of ethyl 3-(2,4-dichlorophenyl)-3-hydroxy propanoate and ethyl 5-phenyl-pent-4-enoate as determined by 1 H NMR using MTPA chloride was found to be ‘ S ’.
Abstract: Deracemisation of aryl and substituted aryl β-hydroxy esters using immobilised whole cells of Candida parapsilosis ATCC 7330 yields the corresponding ( S )-enantiomer in >99% enantiomeric excess and good yield (up to 68%). The absolute configuration of ethyl 3-(2,4-dichlorophenyl)-3-hydroxy propanoate and ethyl 3-hydroxy-5-phenyl-pent-4-enoate as determined by 1 H NMR using MTPA chloride was found to be ‘ S ’. The chemical shifts of the methoxy groups of the two diastereomeric MTPA esters were used as diagnostic signals to determine the absolute configuration.
39 citations
TL;DR: In this article, the authors describe how polyols undergo rapid selective transesterification with β-ketoesters upon microwave irradiation in solvent-free and catalyst-free conditions to form monoesters.
Abstract: Polyols undergo rapid selective transesterification with β‐ketoesters upon microwave irradiation in solvent‐free and catalyst‐free conditions to form monoesters.
4 citations
TL;DR: The absolute configuration of enantiomerically pure ethyl 2-hydroxy-4-(p -methylphenyl)but-3-enoate obtained by the reduction of the corresponding keto ester was assigned by 1 H NMR using Mosher's method as mentioned in this paper.
Abstract: Enantioselective bioreduction of alkyl 2-oxo-4-arylbutanoates and 2-oxo-4-arylbut-3-enoates mediated by Candida parapsilosis ATCC 7330 resulted in the formation of the corresponding ( S )-2-hydroxy compounds in high enantiomeric excesses (93–99%) and good isolated yields (58–71%). The absolute configuration of enantiomerically pure ethyl 2-hydroxy-4-( p -methylphenyl)but-3-enoate obtained by the reduction of the corresponding keto ester was assigned by 1 H NMR using Mosher’s method.
4 citations
TL;DR: In this paper, the authors describe how polyols undergo rapid selective transesterification with β-ketoesters upon microwave irradiation in solvent-free and catalyst-free conditions to form monoesters.
3 citations