The kinetics of the acylation of alpha-chymotrypsin by a series of substituted phenyl p-nitrobenzoates have been studied by stopped flow and conventional spectrophotometry. Electron withdrawal in the leaving group accelerates the rate of acylation, and the p value obtained for eight esters is +1.96. The pH- and pD-independent acylation rate constants are, respectively, 1.40 X 10(4) M-1S-1 and 1...

The reduction of the Pt(IV) complexes [PtCl4(bipy)], [PtCl4(dach)] and [PtCl4(en)] by glutathione (GSH), L-cysteine (L-Cys) and L-methionine (L-Met) was investigated by stopped-flow spectrophotometry at pH 2.0 (in 0.01 M perchloric acid) and at pH 7.2 (in 25 mM Hepes buffer). Kinetic measurements were performed under pseudo-first order conditions with an excess of the reducing agent. The order ...

The reactions of cyclohexane-1,2-bis(4-methyl-3-thiosemicarbazone) (CHMTSC) with MCl2 (M = Co, Ni, Cu or Zn) and Cd(NO3)2 have been shown to produce complexes in which the thiosemicarbazone has been doubly deprotonated [[M(CHMTSC - 2H+)] (M = Co, Ni or Ni)], analogous to those reported earlier with other Schiff base thiosemicarbazones. However, with ZnCl2 and Cd(NO3)2, the complexes isolated ar...

Iron–copper bimetallic nanoparticles (Fe-Cu BNPs) were prepared via a green synthesis route. Ixora finlaysoniana has been used in this study as capping and stabilizing agent the modification of Fe-Cu BNPs. As-synthesized BNPs characterized using different techniques including UV/Vis spectrophotometry, FTIR, XRD SEM. A particle size analyzer SEM studies indicated to be range 50–200 nm. In additi...