Study of phase behavior of fatty acid in oil/water system by HPLC

COLL 183

Bélgica Bravo, belgicabravo@yahoo.es1, Jhoana Sánchez, jhoanasanchez2003@yahoo.com1, Gerson Chávez, genrich2000@hotmail.com1, Ana Beatriz Caceres, caceresana7@cantv.net1, Nelson Márquez, nelsonm@reacciun.ve1, Fredy Ysambertt, ysambertt@yahoo.com1, M Briceño, mbriceño@ula.ve2, and Jean L. Salager, firp@ing.ula.ve3. (1) Lab. Petroquímica y Surfactantes, Departamento de Química-Facultad de Ciencias, Universidad del Zulia, Maracaibo, 526, Venezuela, (2) Lab. FIRP-Facultad de Ingenieria-ULA, Universidad de los Andes, Mérida, Venezuela, (3) Lab. FIRP-Facultad de Ingenieria-ULA, Universidad de los Andes, Avenida 5-Merida, Merida, Venezuela
The phase behavior of Surfactant/oil/water systems depends upon the hydrophilic-lipophilic interaction at interface. In pH-dependent systems, the surface active substance is a mixture of fatty acids (FA) and its sodium salt (soap), which exhibit emulsion property maps that are consistent with the phase behavior and the general emulsion phenomenology. These FA are likely to selectively partition or fractionate between water and oil phases. The FA partition in oil/water systems was determined using a method reported in a previous work to quantify the total acid fraction in each phase. On the other hand, the partition isotherm is obtained by plotted the logarithm decimal of the acid concentration in the oil and water phase determined using the proposed method. It was observed that the interception point in this graph is related with the concentration micellar critique (cmc) of each fatty acid, and the cmc value decrease with the length chain FA
 

Fundamental Research in Colloid and Surface Chemistry
6:00 PM-8:00 PM, Monday, August 20, 2007 BCEC -- East Registration, Poster

Division of Colloid & Surface Chemistry

The 234th ACS National Meeting, Boston, MA, August 19-23, 2007