Separation and gravimetric determination of cerium and lanthanum with N-m-tolyl-m-nitrobenzohydroxamic acid

Kapoor, Himanshu; Agrawal, Y. K.; Verma, Prerna

doi:10.1016/0039-9140(75)80165-2

Cited by 10 publications

(1 citation statement)

References 2 publications

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“…[3,32] The selective modification of glycerol in these positions by lipases is usually performed in anhydrous media, via synthetic routes, with the advantages and drawbacks that this brings forth. [33][34][35][36][37][38] One of the risks of this reaction is acyl migration, [39,40] and this becomes harder to control in aqueous medium. Perhaps this is the reason why few examples may be found in the literature dealing with the regioselective hydrolysis of homo-triglycerides, composed by identical and short carboxylic acids.…”

Section: Introductionmentioning

confidence: 99%

Advantages of Heterofunctional Octyl Supports: Production of 1,2-Dibutyrin by Specific and Selective Hydrolysis of Tributyrin Catalyzed by Immobilized Lipases

et al. 2016

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Different lipases immobilized on octyl agarose or heterofunctional (glyoxyl or divinylsulfone) octyl supports have been compared in the selective and specific production of 1,2‐dibutyrin by hydrolysis of tributyrin. The addition of cosolvents improved the solubility of the substrate thus improving the accumulation of 1,2‐dibutyrin. The form B of the lipase from Candida antarctica (CALB) was selected considering reaction both enzyme activity and reaction yields produced by this biocatalyst. Using this enzyme, the highest dibutyrin yield using 100 mM of tributyrin (over 80 %) was obtained using a medium containing 50 % of cosolvent. However, the use of higher tributyrin concentrations required increasing the concentration of cosolvent in order to increase the soluble fraction of substrate. Under these conditions, the enzyme is released to the medium if it is just physically adsorbed on the support. For this reason, the octyl‐CALB biocatalyst is unsuitable for this reaction. Using octyl‐glyoxyl‐CALB in the presence of 75 % cosolvent to facilitate substrate solubility, a conversion yield of 70 % of dibutyrin could be achieved using 1 M of tributyrin as substrate. Using 500 mM tributyrin, the yield under these conditions increased to 80 %. The biocatalyst could be reused for several cycles without any detrimental effect on its performance.

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Section: Introductionmentioning

confidence: 99%

Advantages of Heterofunctional Octyl Supports: Production of 1,2-Dibutyrin by Specific and Selective Hydrolysis of Tributyrin Catalyzed by Immobilized Lipases

et al. 2016

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Nouvelle détermination de la structure de la P‐chlorobenzaldoxime (Z)

Arte

Declercq

Germain

et al. 1980

Bulletin des Soc Chimique

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Hydroxamic Acids in Gravimetric Analysis

Agrawal

Roshania

1980

Bulletin des Soc Chimique

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The analytical potentialities of hydroxamic acids as reagents for gravimetric determination of aluminium, antimony, barium, beryllium, bismuth, cadmium, cerium, cobalt, copper, dysprosium, erbium, gadolinium, gallium, indium, iron, lanthanum, magnesium, mercury, molybdenum, neodymium, nickel, niobium, praseodymium, samarium, scandium, tantalum, thorium, tin, titanium, tungsten, terbium, uranium, vanadium, yttrium, zinc and zirconium are reviewed.

show abstract

Separation and gravimetric determination of cerium and lanthanum with N-m-tolyl-m-nitrobenzohydroxamic acid

Cited by 10 publications

References 2 publications

Advantages of Heterofunctional Octyl Supports: Production of 1,2-Dibutyrin by Specific and Selective Hydrolysis of Tributyrin Catalyzed by Immobilized Lipases

Advantages of Heterofunctional Octyl Supports: Production of 1,2-Dibutyrin by Specific and Selective Hydrolysis of Tributyrin Catalyzed by Immobilized Lipases

Nouvelle détermination de la structure de la P‐chlorobenzaldoxime (Z)

Hydroxamic Acids in Gravimetric Analysis

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