عنوان المقالة: Influence of Cationic Surfactant (TTAB) on the Rate of Dipeptide (Gly-D-Asp) Ninhydrin Reaction in Absence and Presence of Organic Solvents
Surfactants are widely used in our daily life either directly in household and personal care products or indirectly in
the industrial processes. The kinetics of the interaction of glycyl-DL-aspartic acid (Gly-DL-Asp) with ninhydrin has been
investigated spectrophotometrically in aqueous and organic-solvent media in the absence and presence of cationic surfactant of
tetradecyltrimethylammonium bromide (TTAB). The study was carried out under different experimental conditions. The first
and fractional order-rate were observed for [Gly-DL-Asp] and [ninhydrin], respectively. The reaction was enhanced about fourfold by TTAB micelles. The effect of organic solvents was studied at a constant concentration of TTAB and showed an increase
in the absorbance as well as the rate constant for the formation of product (Ruhemann's purple). The results obtained in
micellar media are treated quantitatively in terms of pseudo-phase and Piszkiewicz cooperativity models. The Arrhenius and
Eyring equations are valid for the reaction over the range of temperatures used and different activation parameters (Ea, ∆H#,
∆S#, and ∆G#) have been evaluated.
ICCIS 2015 : International Conference on Chemical Industry and Science
تاريخ النشر
27/01/2015
الناشر
World Academy of Science, Engineering and Technology
د. عادل أحمد محمد سعيد | Dr. Adel Ahmed Mohammed Seaad | 13627