Kinetic study of an enzymatic liquid-liquid reaction: The hydrolysis of tributyrin by Candida cylindracea lipase

2007 ◽  
Vol 53 (4) ◽  
pp. 373-378 ◽  
Author(s):  
Oswaldo Martinez ◽  
Anne-Marie Wilhelm ◽  
Jean-Pierre Riba
Keyword(s):  
Kinetic Study ◽  
Candida Cylindracea ◽  
Candida Cylindracea Lipase ◽  
Liquid Reaction ◽  
Hydrolysis Of

Hydrolysis of Jatropha curcas oil for biodiesel synthesis using immobilized Candida cylindracea lipase

2015 ◽  
Vol 116 ◽  
pp. 95-100 ◽  
Author(s):  
Nassereldeen Ahmed Kabbashi ◽  
Nurudeen Ishola Mohammed ◽  
Md Zahangir Alam ◽  
Mohamed Elwathig Saeed Mirghani
Keyword(s):  
Jatropha Curcas ◽  
Candida Cylindracea ◽  
Candida Cylindracea Lipase ◽  
Jatropha Curcas Oil ◽  
Biodiesel Synthesis ◽  
Hydrolysis Of

ChemInform Abstract: Candida cylindracea Lipase-Catalyzed Hydrolysis of Methyl Aziridine-2- carboxylates and -2,3-dicarboxylates.

ChemInform ◽  
2010 ◽  
Vol 25 (11) ◽  
pp. no-no
Author(s):  
M. BUCCIARELLI ◽  
A. FORNI ◽  
I. MORETTI ◽  
F. PRATI ◽  
G. TORRE
Keyword(s):  
Candida Cylindracea ◽  
Candida Cylindracea Lipase ◽  
Hydrolysis Of

Candida cylindracea Lipase-Catalyzed Hydrolysis of Methyl Palmitate in Detergentless Microemulsion and Paraffin/Water Biphasic Media

1991 ◽  
Vol 44 (1) ◽  
pp. 53 ◽  
Author(s):  
J Oconnor ◽  
A Aggett ◽  
DR Williams ◽  
RA Stanley
Keyword(s):  
Methyl Palmitate ◽  
Mixed Solvent ◽  
Cost Effective ◽  
Aqueous System ◽  
Candida Cylindracea ◽  
Experimental Conditions ◽  
Candida Cylindracea Lipase ◽  
Rate Of Reaction ◽  
Solvent Systems ◽  
Hydrolysis Of

The activity of lipase from Candida cylindracea has been investigated in the detergentless microemulsion media of n-hexane/propan-2-ol/water and in paraffin/water biphasic mixtures. Analysis of the product of hydrolysis, palmitic acid, was by a titrimetric method developed for non-specific assay of free fatty acids in these mixed-solvent media. The enzyme-catalysed hydrolysis of methyl palmitate was very slow in a complete non-aqueous system, but addition of small amounts of water led to an increased rate of reaction at atmospheric pressure and 37°C. The ability of the enzyme to work in these mixed-solvent systems under very favourable experimental conditions makes it particularly amenable to practical and cost-effective transformations.

Benzyl ethers of methyl α-D-glucopyranoside

1980 ◽  
Vol 45 (7) ◽  
pp. 1959-1963 ◽  
Author(s):  
Dušan Joniak ◽  
Božena Košíková ◽  
Ludmila Kosáková
Keyword(s):  
Kinetic Study ◽  
Spectrophotometric Determination ◽  
Reductive Cleavage ◽  
Ether Bond ◽  
Benzyl Ethers ◽  
Acid Catalyzed ◽  
Model Substances ◽  
Hydrolysis Of

Methyl 4-O-(3-methoxy-4-hydroxybenzyl) and methyl 4-O-(3,5-dimethoxy-4-hydroxybenzyl)-α-D-glucopyranoside and their 6-O-isomers were prepared as model substances for the ether lignin-saccharide bond by reductive cleavage of corresponding 4,6-O-benzylidene derivatives. Kinetic study of acid-catalyzed hydrolysis of the compounds prepared was carried out by spectrophotometric determination of the benzyl alcoholic groups set free, after their reaction with quinonemonochloroimide, and it showed the low stability of the p-hydroxybenzyl ether bond.

Kinetic Study of Hydrolysis of Benzoates. Part XXVI. Variation of the Substituent Effect with Solvent in Alkaline Hydrolysis of Substituted Alkyl Benzoates

2006 ◽  
Vol 71 (11-12) ◽  
pp. 1557-1570 ◽  
Author(s):  
Vilve Nummert ◽  
Mare Piirsalu ◽  
Ilmar A. Koppel
Keyword(s):  
Kinetic Study ◽  
Alkaline Hydrolysis ◽  
Rate Constants ◽  
Substituent Effect ◽  
Substituent Effects ◽  
Alkyl Substituent ◽  
Solvent Parameters ◽  
Substituent Constants ◽  
Hydrolysis Of ◽  
Main Factor

The second-order rate constants k2 (dm3 mol-1 s-1) for the alkaline hydrolysis of substituted alkyl benzoates C6H5CO2R have been measured spectrophotometrically in aqueous 0.5 M Bu4NBr at 50 and 25 °C (R = CH3, CH2Cl, CH2CN, CH2C≡CH, CH2C6H5, CH2CH2Cl, CH2CH2OCH3, CH2CH3) and in aqueous 5.3 M NaClO4 at 25 °C (R = CH3, CH2Cl, CH2CN, CH2C≡CH). The dependence of the alkyl substituent effects on different solvent parameters was studied using the following equations:      ∆ log k = c0 + c1σI + c2EsB + c3∆E + c4∆Y + c5∆P + c6∆EσI + c7∆YσI + c8∆PσI     ∆ log k = c0 + c1σ* + c2EsB + c3∆E + c4∆Y + c5∆P + c6∆Eσ* + c7∆Yσ* + c8∆Pσ* .  ∆ log k = log kR - log kCH3. σI and σ* are the Taft inductive and polar substituent constants. E, Y and P are the solvent electrophilicity, polarity and polarizability parameters, respectively. In the data treatment ∆E = ES - EH2O , ∆Y = YS - YH2O , ∆P = PS - PH2O were used. The solvent electrophilicity, E, was found to be the main factor responsible for changes in alkyl substituent effects with medium. When σI constants were used, variation of the polar term of alkyl substituents with the solvent electrophilicity E was found to be similar to that observed earlier for meta and para substituents, but twice less when σ* constants were used. The steric term for alkyl substituents was approximately independent of the solvent parameters.

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