Potentiometric study of cetylpyridinium chloride cooperative binding to anionic azo-dyes

Abstract

A ligação do cloreto de cetilpiridinio (CCP) com alguns corantes azo (X6G, 3-BL, DY-42) tem sido extensivamente estudada em várias concentrações de corantes, usando eletrodo de membrana seletiva a cetilpiridinio. Este método se apresenta rápido e preciso. Gráficos logarítmicos de Klotz foram construídos a partir de medidas de EMF. Estes gráficos indicaram cooperatividade em todas as interações. Isotermas de ligação precisas foram obtidas e analisadas usando-se a equação de Hill. Os valores dos parâmetros da equação de Hill foram estimados e determinados, considerando-se o fato de que o parâmetro de saturação da ligação na equação de Hill (y) pode ser determinado a partir da razão de medidas da força eletromotriz, na presença e ausência do corante. Em todas as interações, os coeficientes de Hill indicam ligação cooperativa nas interações CCP-corante devido à combinação das interações eletrostáticas e hidrofóbicas. As energias de Gibbs intrínsecas aos processos de ligação foram calculadas.The binding of cetylpyridinium chloride (CPC) with some azo dyes (X6G, 3-BL, DY-42) has been extensively studied at various concentration of dyes, using cetylpyridinium-selective membrane electrode as a fast and accurate method. Klotz logarithmic plots have been constructed from EMF measurements. These plots indicated cooperativity in all of interactions. The accurate binding isotherms have been obtained and analyzed using Hill equation. The values of Hill equation parameters have been estimated and determined by considering this fact that saturation parameter of binding in the Hill equation (y) can be determined from the ratio of electromotive force (EMF) measurements in the presence and absence of dye. In all of the interactions Hill coefficients indicate cooperative binding in CPC-dye interactions due to the combination of both electrostatic and hydrophobic interactions. Intrinsic Gibbs energies of binding processes have been also calculated and interpreted on basis of interaction mechanism.

New Insight on Biological Interaction Analysis: New Nanocrystalline Mixed Metal Oxide SPME Fiber for GC-FID Analysis of BTEX and Its Application in Human Hemoglobin-Benzene Interaction Studies

“…So we can calculate the saturation parameter, Y, in the Hill equation using equation 1 and estimation of saturation parameter [29] : …”

Influence of Additives and Temperature on the Interaction of Acid Red 151 Dye with Cetyltrimethylammonium Bromide: A Conductometric Study

“…However, azo dye classes such as sulfur azo dyes (organic compounds containing sulfur or sodium sulfide) and vats (chemically complex, and water-insoluble; among the oldest dyes employed) in fibrous textiles based on cotton and wool, exhibit poor performance, thereby motivating further research and development. Though ample works have been published on azo dyes on the basis of spectroscopic (Bielska et al, 2009;Cegarra and Riva, 1988;Fazeli et al, 2012;Gokturk and Tuncay, 2003;Karukstis et al, 1998;Karukstis et al, 2010;Mahbub et al, 2019e), potentiometric (Ghoreishi et al, 2007;Hosseinzadeh et al, 2007;Sharma et al, 2016;Simončič and Špan, 1998), and tensiometric (Khamis et al, 2005;Sachina et al, 2019) approaches, there is a dearth of conductometric study on the azo dye-surfactant ion pair. The association behavior of anionic azo dye with anionic, cationic, as well as nonionic surfactants in H 2 O has been reported in the literature (Nora, 2012).…”

Spectroscopic and conductometric studies on the interactions of thionine with anionic and nonionic surfactants

“…Although many papers have been dedicated to dye-surfactant interactions over recent years [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20], studies in this area are still of interest from the theoretical viewpoint and are of great importance in dyeing technology, as surfactants can be used as solubilisers for waterinsoluble dyes to break down dye aggregates in order to facilitate adsorption processes on fibres. Interactions between dyes and surfactants have been studied by various techniques, such as spectrophotometry [7][8][9][10][11][12][13][14][15][16], conductometry [17][18][19], and potentiometry [20][21][22]. Among these experimental methods, the most widely used has been spectrophotometry, as surfactants influence the chemical equilibria as well as the spectral and electrochemical responses of substrates as a result of dye-surfactant interactions.…”