Catalytic influence of 16-
            <i>s</i>
            -16 gemini surfactants on the rate constant of histidine and ninhydrin

Kumar, Dileep; Rub, Malik Abdul

doi:10.1098/rsos.191648

Cited by 21 publications

(6 citation statements)

References 61 publications

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“…The study deals with the synthesis and characterization of gemini surfactants and their influence on the kinetic behavior of ninhydrin with zinc-glycylleucine. The reason for choosing this particular study is the mechanism of ninhydrin with amino acids reaction in water, conventional surfactants (CTAB, cetylpyridinium bromide, CPB) and the various solvent medium is well recognized [24][25][26][27][28][29][30]59 . Under the identical reaction condition, it was found that the study was catalyzed and accelerated quite enough in gemini surfactants (below their cmc value) than aqueous medium 73 .…”

Section: Discussionmentioning

confidence: 99%

“…Ninhydrin reactions are one of the most fundamental and biochemical studies. Ninhydrin, a chemical reagent, is used enormously for detection of amine functional group wherein it reacts with an amino group and generates diketohydrindylidene-diketohydridamine (DYDA) [22][23][24][25][26][27][28][29][30] . The color of the product formed between the reaction of ninhydrin and amino acids disappears at room temperature, several efforts were performed towards the stability of products that include the formation of the metal complex with amino acids, change of solvent, presence of conventional monomeric surfactant 28,[31][32][33] .…”

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confidence: 99%

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Kinetic study of the metal-dipeptide complex with ninhydrin facilitated by gemini (m-s-m) surfactant micelles

Azum

Kumar

2020

Sci Rep

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the three Gemini (m-s-m; m (head group) = 16 and s (spacer) = 4, 5, 6) surfactants have been synthesized and their impact on reaction of zinc(ii)-glycylleucine complex ([Zn(ii)-Gly-Leu] +) and ninhydrin were studied at temperature (343 K) and pH (5.0) using spectroscopic method. Influence of several factors, viz., [Zn(II)-Gly-Leu] + , [ninhydrin], temperature and pH were also carried out on title reaction in geminis. Rates of reaction are the first-order path in concentration of [Zn(II)-Gly-Leu] + complex and fractional order path in concentration of ninhydrin. The catalysis of gemini 16-s-16 surfactant micelles was investigated below and above their critical micelle concentration (cmc) value and detailed elaboration were provided in the text. In the present case, rate constants, k ψ , increased on increasing geminis ([gemini] are below their cmc, region I) and stayed nearly constant (region II). The shape of (region I and II) surfactants ([gemini] = 0 to 400 × 10 −5 mol dm −3) are similar to a cetyltrimethylammonium bromide, CTAB (single hydrophilic head group and hydrophobic part). Later, a sharp increment in rate was observed with higher [gemini] (region III, (Fig. 5). The study was catalyzed and accelerated quite enough by geminis (at concentrations below their cmc) compared to aqueous. An appropriate mechanism has been proposed for accounting for the distribution of reactants between aqueous and micellar pseudo phases. Resulting kinetic data were used to determine the binding constants of micelle-substrate (K B) and micelle-ninhydrin (K nin).

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Section: Discussionmentioning

confidence: 99%

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confidence: 99%

Kinetic study of the metal-dipeptide complex with ninhydrin facilitated by gemini (m-s-m) surfactant micelles

Azum

Kumar

2020

Sci Rep

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“…Gemini surfactants can produce aggregates such as micelles, bilayers, vesicles, and other structures with different additives [88]. Several authors have carried out recent studies related to the formation of aggregates from gemini surfactants due to the benefits of these surfactants compared to those with a single hydrophobic chain.…”

Section: Micelles Formationmentioning

confidence: 99%

Gemini and Bicephalous Surfactants: A Review on Their Synthesis, Micelle Formation, and Uses

Guerrero-Hernández¹,

Meléndez‐Ortiz²,

Cortez-Mazatan³

et al. 2022

IJMS

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The use of surfactants in polymerization reactions is particularly important, mainly in emulsion polymerizations. Further, micelles from biocompatible surfactants find use in pharmaceutical dosage forms. This paper reviews recent developments in the synthesis of novel gemini and bicephalous surfactants, micelle formation, and their applications in polymer and nanoparticle synthesis, oil recovery, catalysis, corrosion, protein binding, and biomedical area, particularly in drug delivery.

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“…The rate constant (k ψ ) values were estimated as an average of at least triplicate runs. A detailed procedure in regard of kinetic measurements is available in the literature published previously [57][58][59][60][61][62][63].…”

Section: Kinetic Measurementsmentioning

confidence: 99%

Synthesis and characterization of geminis and implications of their micellar solution on ninhydrin and metal amino acid complex

2020

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In our study, three gemini dicationic surfactants with different methylene group spacer (16-6-16, 16-5-16 and 16-4-16) have been synthesized and characterized in solution by 1 H NMR spectroscopic technique. The implications of gemini micellar solution on ninhydrin and metal amino acid complex ([Cu(II)-Trp] + ) were performed by the means of single-beam UV–visible spectroscopy. The absorbance was noted at regular time intervals and values of rate constant ( k ψ ) were determined by using a computer-based program. Synthesized surfactants proved as an efficient catalyst on the interaction of ninhydrin with metal amino acid complex as compared with conventional surfactant and aqueous systems. The required description regarding the implications of gemini dicationic surfactants are provided in the text in detail. The conductivity technique was applied in order to get critical micelle concentration (cmc) of geminis in the presence and absence of reactants. Catalytic results developed in gemini dicationic surfactant system were explained effectively by pseudo-phase model. Various thermodynamic quantities, viz ., activation energy, E a , activation enthalpy, Δ H # , and activation entropy, Δ S # , were obtained on interaction of ninhydrin with [Cu(II)-Trp] + in gemini systems by applying Eyring equation. A detailed explanation about these evaluated parameters was also made.

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Catalytic influence of 16- s -16 gemini surfactants on the rate constant of histidine and ninhydrin

Cited by 21 publications

References 61 publications

Kinetic study of the metal-dipeptide complex with ninhydrin facilitated by gemini (m-s-m) surfactant micelles

Kinetic study of the metal-dipeptide complex with ninhydrin facilitated by gemini (m-s-m) surfactant micelles

Gemini and Bicephalous Surfactants: A Review on Their Synthesis, Micelle Formation, and Uses

Synthesis and characterization of geminis and implications of their micellar solution on ninhydrin and metal amino acid complex

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