title: Internal charge transfer based ratiometric interaction of anionic surfactant with calf thymus DNA bound cationic surfactant: Study I.
abstract: Cetyl trimethyl ammonium bromide (CTAB) binds calf thymus (ct-) DNA like anionic biopolymers electrostatically and established equilibrium both in the ground as well as in excited state in aqueous medium at pH 7. Anionic sodium dodecyl sulfate (SDS) does not show even hydrophobic interaction with ct-DNA at low concentration. On contrary, SDS can establish well defined equilibrium with DNA bound CTAB in ground state where the same CTAB-DNA isosbestic point reappears. First report of internal charge transfer (ICT) based binding of CTAB with ct-DNA as well as ICT based interaction of anionic SDS with DNA bound CTAB that shows dynamic quenching contribution also. The reappearance of anodic peak and slight increase in cathodic peak current with increasing concentration (at lower range) of anionic SDS, possibly reflect the release of CTAB from DNA bound CTAB by SDS.
authors.affiliation: Department of Chemistry, Dr. Bhupendranath Dutta Smriti Mahavidyalaya, Burdwan 713407, India.
authors.forename: Abhijit
authors.initials: A
authors.lastname: Mukherjee
authors.affiliation: Department of Chemistry, Dr. Bhupendranath Dutta Smriti Mahavidyalaya, Burdwan 713407, India. Electronic address: tanchem_bu@yahoo.co.in.
authors.forename: Tandrima
authors.initials: T
authors.lastname: Chaudhuri
authors.affiliation: Centre for Surface Science, Department of Chemistry, Jadavpur University, Kolkata 700 032, India.
authors.forename: Satya Priya
authors.initials: SP
authors.lastname: Moulik
authors.affiliation: Department of Chemistry, University of Burdwan, Burdwan 713104, WB, India.
authors.forename: Manas
authors.initials: M
authors.lastname: Banerjee
mesh_terms: D000818:Animals; D001665:Binding Sites; D002417:Cattle; D000077286:Cetrimonium; D002593:Cetrimonium Compounds / Q000737:chemistry / Q000378:metabolism*; D004247:DNA / Q000737:chemistry / Q000378:metabolism*; D006863:Hydrogen-Ion Concentration; D057927:Hydrophobic and Hydrophilic Interactions; D007477:Ions / Q000737:chemistry / Q000378:metabolism; D012967:Sodium Dodecyl Sulfate / Q000737:chemistry / Q000378:metabolism*; D055672:Static Electricity; D013501:Surface-Active Agents / Q000737:chemistry / Q000378:metabolism*
chemical_list: D002593:Cetrimonium Compounds; D007477:Ions; D013501:Surface-Active Agents; D012967:Sodium Dodecyl Sulfate; D004247:DNA; C427203:calf thymus DNA; D000077286:Cetrimonium
keywords: CV; DNA–CTAB isosbestic; Dynamic quenching contribution; Isoemissives; SDS–(DNA bound CTAB) interaction