Zinc Dipeptide Complex ([zn(ii)-gly-tyr])–ninhydrin Reaction in Presence of Gemini Surfactants: a Kinetic Study
نویسندگان
چکیده
Kinetics of the title reaction has been carried out by studying the reaction spectrophotometrically at 80 oC and pH 5.0 in presence of cationic gemini (alkanediyl-α, ωbis(dimethylhexadecylammonium bromide)) surfactants. The reaction followed first-order kinetics in [Zn(II)-Gly-Tyr]T complex and fractional-order kinetics in [ninhydrin]T. Typical rate constant (kΨ) increase and leveling-off regions (like conventional monomeric surfactants, e.g., CTAB) are found with gemini surfactants. Additionally, the gemini surfactants also produced a third region of increasing kΨ at higher concentrations. The data are interpreted in terms of pseudo-phase model (assuming the association/incorporation of both the reactants at the micellar surface).
منابع مشابه
Interaction of Nickel-Dipeptide complex with Ninhydrin in Aqueous and Micellar Media
Ninhydrin reactions using manual and automated techniques as well as ninhydrin spray reagents are widely used to analyze and characterize amino acids, peptides, and proteins as well as numerous other ninhydrin positive compounds in biomedical, clinical, food, forensic, histochemical, microbiological, and nutritional and plant studies. Ninhydrin in aqueous solution reacts with α-amino acids to g...
متن کاملSynthesis of Zinc Dimethyldithiocarbamate by Reductive Disulfide Bond Cleavage of Tetramethylthiuram Disulfide in Presence of Zn2+
The zinc(II) complex [Zn2(dmdtc)2(μ-dmdtc)2] has been synthesized directly from thiram ligand, containing a disulfide bond {dmdtc = N,N-dimethyldithiocarbamate; thiram = N,N-tetramethylthiuram disulfide}, and characterized by elemental analysis and spectroscopic methods. Surprisingly thiram, undergoes a reductive disulfide bond scission upon reaction with Zn2+ in methanolic media to give the [Z...
متن کاملKinetic evidence for the formation of a Michaelis-Menten-like complex between horseradish peroxidase compound II and di-(N-acetyl-L-tyrosine).
The formation of a reversible adsorption complex between a dimer of N-acetyl-L-tyrosine [di-(N-acetyl-L-tyrosine), (NAT)2] and horseradish peroxidase (HRP) compound II (CII) was demonstrated using a kinetic approach. A specific KIIm value (0.58 mM) was deduced for this step from stopped-flow measurements. The dimerization of the dipeptide Gly-Tyr was analysed at the steady state and compared wi...
متن کاملSynthesis and crystal structure of Zinc (II) Complex [Zn(25-MBTSC)2I2]
Zinc (II) complex, [Zn(25-MBTSC)2I2] (1), where (25-MBTSC = (E)-2-(2,5-dimethoxybenzaldehyde) thiosemicarbazone, has been synthesized from the reaction of ZnI2 with 25-MBTSC in methanol as solvent at 25 ºC. It was characterized by elemental analysis (CHN) and is confirmed by single-crystal X-ray diffraction analysis. The complex 1 crystallizes in a triclinic system, with space group P-ī, having...
متن کاملSequence recognition and self-sorting of a dipeptide by cucurbit[6]uril and cucurbit[7]uril.
Cucurbit[7]uril forms very strong complex with zwitterionic dipeptide Phe-Gly with affinity exceeding 10(7) M(-1) and effectively recognizes peptide sequence of Phe-Gly over Gly-Phe as well as Tyr-Gly over Gly-Tyr and Trp-Gly over Gly-Trp with relative affinities of 23 000, 18 000 and 2000, respectively.
متن کامل