Phase behavior of aqueous two-phase systems of cationic and anionic surfactants and their application to theanine extraction

Junwei Zhang; Yan Wang; Qijun Peng

Korean Journal of Chemical Engineering, Vol.30, No.6, 1284-1288, June, 2013

DOI10.1007/s11814-013-0040-9 Export Citation

Phase behavior of aqueous two-phase systems of cationic and anionic surfactants and their application to theanine extraction

Junwei Zhang^†, Yan Wang, and Qijun Peng^†

The Key Laboratory of Food Colloids and Biotechnology, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, P. R. China

E-mail:,

Phase behavior of aqueous two-phase systems (ATPS) containing cationic (SDS) and anionic (CTAB) surfactants and its application to theanine extraction was studied. Results indicated the ATPS could form under the certain SDS/CTAB molar ratio; there was a reasonable consistency between the conductivity and the formation region of ATPS, and the viscosity was higher in the formation region of ATPS. Additionally, the phase ratio increased with increase of CATB concentration, and the interfacial film between the top phase and the bottom phase was resilient. Moreover, the theanine extraction with ATPS was realized in the waste liquid of tea polyphenol production (WLTPP), and the partition coefficient of theanine decreased with increase of WLTPP concentration, whereas the extraction rate of theanine increased. The partition coefficient decreased with increasing SDS/CTAB molar ratio, and the extraction rate of theanine increased with increase of SDS/CTAB molar ratio.

Keywords:Phase Behavior;Aqueous Two-phase Systems;Surfactant;Extraction;Theanine

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[Referenced By]

[1] Turner A, Xu J, Water Res., 42, 318 (2008)

[2] Li M, Chemosphere., 70, 1796 (2008)

[3] Exerowa D, Platikanov D, Adv. Colloid Interface., 147/148, 74 (2009)

[4] Weschayanwiwat P, Kunanupap O, Scamehorn JF, Chemosphere., 72, 1043 (2008)

[5] Nan YQ, Liu HL, Hu Y, J. Colloid Interface Sci., 293(2), 464 (2006)

[6] Khan F, Siddiqui US, Khan IA, Kabir-ud-Din, Colloid Surf.A., 394, 46 (2012)

[7] Parekh P, Varade D, Parikh J, Bahadur P, Colloid Surf. A., 385, 111 (2011)

[8] Pi X, Zhou Y, Zhou L, Yuan M, Li R, Fu H, Chen H, Chinese J. Catal., 32, 566 (2011)

[9] Liu Y, Wu Z, Dai J, Fluid Phase Equilib., 320, 60 (2012)

[10] Nan Y, Liu H, Hu Y, Colloid Surf. A., 269, 101 (2005)

[11] Fischer I, Franzreb M, Colloid Surf. A., 377, 97 (2011)

[12] Filho PAP, Mohamed RS, Process Biochem., 39, 2075 (2004)

[13] Kresheck GC, Wang Z, J. Chromatogr. B., 1/2, 247 (2007)

[14] Xiao J, Sivars U, Tjerneld F, J. Chromatogr. B., 743, 327 (2000)

[15] Hansson P, J. Colloid Interface Sci., 332(1), 183 (2009)

[16] Boruah B, Saikia PM, Gohain B, Dutta RK, J. Mol. Liq., 151, 81 (2010)

[17] Martinez F, Pena MA, Bustamante P, Fluid Phase Equilib., 308(1-2), 98 (2011)

[18] Browarzik C, Browarzik D, Winkelmann J, Fluid Phase Equilib., 261(1-2), 238 (2007)

[19] Nordstrom FL, Rasmuson AC, Eur. J. Pharm. Sci., 36, 330 (2009)

[20] Keenan EK, Finnie MDA, Jones PS, Rogers PJ, Priestley CM, Food Chem., 588 (2011)

[21] Tsuge H, Sano S, Hayakawa T, Kakuda T, Unno T, B.B.A., 1620, 47 (2003)

[22] Foxe JJ, Morie KP, Laud PJ, Rowson MJ, De Bruin EA, Kelly SP, Neuropharmacology., 1 (2012)

[23] Lam AC, Schechte RS, J. Colloid Interface Sci., 120, 42 (1987)

[24] Zhang L. Teng HN, J. Qingdao Univ. Sci. Technol., 28, 403 (2007)