Simultaneous electrochemical determination of three sunscreens using cetyltrimethylammonium bromide

Voltammetric determination of the phytoestrogen genistein in soy flours and soy based supplements using cationic surfactant cetyltrimetylammonium bromide

“…In addition, these qualities can be confirmed by experience in our research group, since various analytical methods based on the reduction of organic compounds in micellar media have been successfully developed [33][34][35]. Thus, the present study reports on the development of an electroanalytical method to analyze genistein in soy flours and soy based supplements, through on its reduction in the presence of the cationic surfactant CTAB.…”

“…It is well known that adsorbed surfactants on electrode surfaces may alter the electrode overvoltage and influence the electron transfer rate. The possible adsorption of the cationic surfactant CTAB onto the electrode surface may form a positively charged hydrophilic film in which the headgroup of the surfactant is directed toward the solution [35,40,41]. This hydrophilic layer contributes to genistein reduction through interaction between surfactant and compound [42], as will be further in Section 3.2.1.…”

Voltammetric analysis of sun-block preparations containing octocrylene and its association with 2-Hydroxy-4-methoxybenzophenone and octyl methoxycinnamate

“…Our research group has demonstrated that electroanalytical techniques can be effectively used to develop alternative methods, by using these techniques it was possible to quantify several active sunblocking agents after analyzing different cosmetic samples [14][15][16][17][18]. Accordingly, in one of our developed methods [14], differential-pulse polarography and a mercury-dropping electrode were used to determine 2-ethylhexyl-4-methoxycinnamate (EHMC), individually and in the presence of 2-hydroxy-4-methoxybenzophenone (BENZO-3) or 4-methylbenzylidene camphor (4-MBC).…”

“…Square wave voltammetry and a mercury electrode [15,16] were used to detect and quantify 4-MBC in a mixture containing BENZO-3 and octyl methoxycinnamate (OMC). The cationic surfactant CTAB was also effectively used to avoid electrode fouling and to improve the selective detection of combined sunscreen agents [15].…”

Analytical Determination of Benzophenone-3 in Sunscreen Preparations Using Boron-Doped Diamond Electrodes

“…In a study performed by Cardoso, et al [12], was proposed a methodology based on electrochemical reduction for the simultaneous determination of three sunscreen agents, namely 4-methylbenzylidene camphor (MBC), BENZO and 2-ethylhexyl-4-methoxycinnamate (EHMC) by differential-pulse polarography (DPP). The highest peak currents and optimal separation of reduction peaks were obtained by using a supporting electrolyte consisted of Britton-Robinson buffer-methanol (8:2) solution at pH 4.0 and cationic surfactant 3.0 × 10…”