Study of copper(II)–glycylphenylalanine complex with ninhydrin in aqueous and cationic CTAB micellar media: A kinetic and mechanistic approach

Kumar, Dileep; Neo, Kian-Eang; Rub, Malik Abdul; Tan, Ze; Beh, Woan Lin; Wong, Hann Ling

doi:10.1016/j.molliq.2014.10.041

Cited by 14 publications

(2 citation statements)

References 21 publications

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“…Our results show the viscosity of heavy crude oil (API = 19) significantly decreased (from 2350 to 900 mPaÁs). This result is comparable with the results of other surfactants such as Triton TM X100 and fatty acid [41][42][43]. Extracted saponin significantly increased the API of heavy crude oil which is very important in upgrading of heavy crude oil.…”

Section: Resultssupporting

confidence: 82%

Production of Saponin Biosurfactant from Glycyrrhiza glabra as an Agent for Upgrading Heavy Crude Oil

Hajimohammadi

Hosseini

Amani

et al. 2016

J Surfact & Detergents

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Saponins are the main group of phytogenic biosurfactants extracted from plants. One of the significant applications of these compounds is upgrading and viscosity reduction of heavy crude oil water in oil (W/O) emulsions. In this research, use of saponin extracted from Glycyrrhiza glabra was investigated for viscosity reduction of heavy crude oil and upgrading its API properties. The extracted saponin was characterized using Fourier transform infrared (FTIR) and nuclear magnetic resonance (NMR) spectroscopy. Phase behavior analysis demonstrated a reduction in initial viscosity and improved API gravity of the heavy oil from 2350 mPa·s and 19 to 900 mPa·s and 27, respectively. In addition, the emulsification index (E24) was found to be 98 % at a saponin concentration of 8 % w/v. It was observed that the emulsions were stable in the pH range of 5.5–13, temperature from 30 to 80 °C and salinity up to 6 % w/v of NaCl solution. Average diameter of W/O droplets evaluated by dynamic light scattering (DLS) were in the range of 10–15 µm. The results obtained from the present research revealed that the extracted saponin improved the physical characteristics of heavy crude oil. We propose the use of saponin as a potential alternative to conventional emulsifiers for upgrading heavy crude oil in petroleum industry.

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Section: Resultssupporting

confidence: 82%

Production of Saponin Biosurfactant from Glycyrrhiza glabra as an Agent for Upgrading Heavy Crude Oil

Hajimohammadi

Hosseini

Amani

et al. 2016

J Surfact & Detergents

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“…All three double-chained quaternary ammonium geminis have shown the same behavior and the rate follows the order at several concentrations as 16–4–16 > 16–5–16 > 16–6–16. Such occurred behavior can only be justified once a substrate is entirely micellar bound with the structure of micelles becoming static. , Activities of [gemini] on k ψ obtained in parts I and II are just the same to those reported in conventional surfactants, previously. − Undoubtedly, an excellent catalyzing strength and better results compared to conventional surfactants confirm the better selection of quaternary ammonium geminis in the current work.…”

Section: Results and Discussionsupporting

confidence: 78%

Effect of Quaternary Ammonium Gemini Surfactant Solution on the Rate Constant of the Ninhydrin–Lysine Reaction

Kumar,

Khan,

Posa

et al. 2023

Ind. Eng. Chem. Res.

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The effect of solutions of double-chained quaternary ammonium gemini surfactants (16-s-16, s = 4−6) was characterized on the rate constant of the ninhydrin (nin) and lysine (Lys) reaction using a ultraviolet−visible (UV−vis) spectrophotometer. Rate constant (k ψ ) values were obtained at different geminis. However, k ψ values obtained at several geminis were displayed in the form of the k ψ −[gemini] rate profile, and the quantitative estimation of these results was elucidated employing a model of micellar catalysis referred to as pseudophase. The role of other experimental ingredients such as nin, Lys, pH, and temperature (T) was examined in geminis, and k ψ values as a function of these parameters were determined. Data treatment confirms a fractional order in [nin] and a unity order in [Lys]. Using conductometric evaluation, the critical micellar concentration (cmc) of pure double-chained gemini surfactants (16−6−16, 16−5−16, and 16−4−16) and presence of nin and Lys were recorded. Results of the present experimental value were used to determine micellar binding constants (K A for Lys and K B for nin). The binding constants and second-order rate (k m ) affect the solvent properties at the micellar surface and hence are taken into consideration and discussed.

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Catalytic role of 16‐s‐16 micelles on condensation reaction of ninhydrin and metal‐dipeptide complex

Kumar

Rub

2018

J of Physical Organic Chem

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Catalytic role of 16-s-16 (s = spacer) micelles on condensation reaction of ninhydrin and metal-dipeptide ([Cu (II)-Gly-Leu] + ) complex have been studied by varying reactants concentration at various temperatures ranges from 333 K to 353 K. The reaction was monitored at definite time interval with the help of UV-vis spectrophotometer. For evaluation of critical micelle concentration (cmc) of 16-s-16 surfactants with and without reactants (ninhydrin and metal-dipeptide complex), conductometic technique was used throughout the study. During kinetic runs, study confirms the first-order path in complex and fractional-order path in ninhydrin. Rate constant (k ψ ) increased with rise in [16-s-16] below cmc value, then became almost constant with further increase in concentration (like conventional surfactants). Great enhancement in rate value was noted at higher surfactant concentrations. The rate enhancement below and above cmc values of 16-s-16 surfactants has been accounted in the light of pseudo-phase model. Kinetic data were used to calculate several factors including micelle-substrate binding constants and thermodynamic parameters.

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Study of copper(II)–glycylphenylalanine complex with ninhydrin in aqueous and cationic CTAB micellar media: A kinetic and mechanistic approach

Cited by 14 publications

References 21 publications

Production of Saponin Biosurfactant from Glycyrrhiza glabra as an Agent for Upgrading Heavy Crude Oil

Production of Saponin Biosurfactant from Glycyrrhiza glabra as an Agent for Upgrading Heavy Crude Oil

Effect of Quaternary Ammonium Gemini Surfactant Solution on the Rate Constant of the Ninhydrin–Lysine Reaction

Catalytic role of 16‐s‐16 micelles on condensation reaction of ninhydrin and metal‐dipeptide complex

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