IR@NEIST - North East Institute of Science and Technology (CSIR)
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Carbonylrhodium complexes of pyridine ligands and their catalytic activity towards carbonylation of methanol
Get PDFElyyal oleate synthesis by Porcine pancreatic lypase in organic solvent
Get PDFThe Porcine pancreatic lipase catalysed esterification of oleic acid with ethanol was studied in 10 different solvents with constant
initial water content in the reaction mixture. The initial rates of the esterification reaction were attempted to correlate with such solvent
properties as hydrophobicity (log P), water solubility (Sw), dielectric constant, electron pair acceptance and donation index (expressed as
EN
T
+ DNN), polarisability etc. While significantly good linear correlations with log P and log Sw were obtained, the correlations with the
other properties were found to be inferior. The kinetics of the reactions was found to conform to the so-called Ping-Pong-Bi-Bi model
with ethanol inhibition effect and the estimated model parameters exhibited statistically significant correlation with log P consistent to its
correlation with the initial rate. Assuming that organic solvents do not interfere with the lipase–substrate binding process nor with the
catalytic mechanism, the contribution of substrate–solvent interactions to enzyme kinetics was accounted for by replacing the substrate
concentrations of the intrinsic kinetic equations by thermodynamic activities. The values of the corrected intrinsic parameters (Km, ksp)
and the maximal rate (Vmax) were found to be nearly equal for all the medi
A facile one pot synthesis of pyrazolo[3,4-D] pyrimidines
Get PDFThe reaction of 6-hydrazino uracils 1 with isocyanates 2 gave access to an efficient one-pot synthesis of pyrazolo[3,4-
d]pyrimidines 3 in excellent yield
Novel lipase isolated from a Pseudomonus strain and its application in the synthesis of S(+)-2-O-benzylglycerol- 1-acetate
Get PDFProduction of pseudomonas lipase in N-alkyl substrateand its isolation using an improved aluminium sulphate pricipitation technique
Get PDFAlCl3,6H2O/KI/H2O/CH3CN : a new alternate system for dehydration of oximes and amides in hydrated media
Get PDFDehydration of oximes and amides to nitriles was
carried out using the AlCl3â6H2O/KI/H2O/CH3CN system. It
produced isoquinoline derivatives 8a-c (Bischler Naperialski
reaction) when reacted with amides 7a-c in hydrated
media. Also, the keto oximes produced anilides (Beckmann
rearrangement) with the system under the same reaction
conditions
Catalytic activity of dicarbonylrhodium complexes of aminobenzoic acid ligands on carbonylation of alcohol
Get PDFRhodium(I) complexes of the type, [Rh(CO)2ClL] (1), where L = 2-aminobenzoic acid (a), 3-aminobenzoic acid (b) and
4-aminobenzoic acid (c), have been synthesised. Oxidative addition (OA) of complexes 1 with electrophiles like RI (R = CH3,
C2H5) produce Rh(III) complexes of the type [Rh(CO)(COCH3)IClL] (2) and [Rh(CO)(COC2H5)IClL] (3). The OA reactions
of complexes 1 with RI follow a two stage kinetics and the observed rate constants are in the order 1b > 1c > 1a irrespective
of stages. The complexes 1 show higher catalytic activity for carbonylation of methanol and ethanol than that of the well
known species [Rh(CO)2I2]"12
Ki-Pung YooIsentropic Compressibility of Aqueous and Methanolic Electrolytic Solution
Get PDFWe studied the effect of ion-solvent and ion-ion interactions on the isentropic compressibility of aqueous
and methanolic electrolytic solutions. In aqueous electrolytic solutions a critical concentration is attained and correlated
with the completion of tile primary hydi-ation shell. Such a situation is lacking in methanolic solutions. An expression
has been derived for estimating the hydration numbers of the electrolyte in its solutions by using the isentropic compressibility
data
Optimization of dilution rate for the production of value added product and simultaneous reduction of organic load from pineapple cannery waste
Get PDFCandida utiilis NRRL Y-900 was grown on pineapple cannery waste as the sole carbon
and energy source in a chemostat at dilution rates ranging between 0.05 and 0.65 h–1 to determine
the growth kinetics. The cell yield coefficient varied with dilution rate and a maximum value of
0.662 ± 0.002 gx/gcarb was obtained at a dilution rate of 0.4 h–1. At steady state, the concentrations of
carbohydrate, reducing sugar, and chemical oxygen demand (COD) appeared to follow Monod
kinetics. At maximum specific growth rate ( max) 0.65 h–1, the saturation constants for
carbohydrate, reducing sugar and COD were 0.51 ± 0.02 gcarb/1, 0.046 ± 0.003 grs/1, and 1.036 ±
0.001 gCOD/1, respectively. Maximum biomass productivity (Q x max) 2.8 ± 0.03 gx/1 h was obtained
at a dilution rate of 0.5 h–1. At this dilution rate, only 71.0 ± 0.41% COD was removed whereas at a
dilution rate of 0.1 h–1, 98.2 ± 0.35% reduction in COD was achieved. At a dilution rate of 0.4 h–1,
the optimal yeast productivity and reduction in COD were 2.7 ± 0.13 gp/1 h, and 84.2 ± 0.42%,
respectively.
Biomass - Candida utilis - chemostat - continuous culture - growth kinetics - pineapple cannery
waste - steady stat