Kinetic Characterization of Swelling of Liquid Crystalline Phases of Glyceryl Monooleate

  • Lee, Jae-Hwi (Department of Industrial and Physical Pharmacy, Purdue University, West Lafayette) ;
  • Choi, Sung-Up (College of Pharmacy, Chung-Ang University) ;
  • Yoon, Mi-Kyeong (College of Pharmacy, Chung-Ang University) ;
  • Choi, Young-Wook (College of Pharmacy, Chung-Ang University)
  • Published : 2003.10.01


Research in this paper focuses on the kinetic evaluation of swelling of the liquid crystalline phases of glyceryl monooleate (GMO). Swelling of the lamellar and cubic liquid crystalline phases of GMO was studied using two in vitro methods, a total immersion method and a Franz cell method. The swelling of the lamellar phase and GMO having 0 %w/w initial water content was temperature dependent. The swelling ratio was greater at $20^{\circ}^C than 37^{\circ}^C$ . The water uptake increased dramatically with decreasing initial water content of the liquid crystalline phases. The swelling rates obtained using the Franz cell method with a moist nylon membrane to mimic buccal drug delivery situation were slower than the total immersion method. The swelling was studied by employing first-order and second-order swelling kinetics. The swelling of the liquid crystalline phases of GMO could be described by second-order swelling kinetics. The initial stage of the swelling (t < 4 h) followed the square root of time relationship, indicating that this model is also suitable for describing the water uptake by the liquid crystalline matrices. These results obtained from the current study demonstrate that the swelling strongly depends on temperature, the initial water content of the liquid crystalline phases and the methodology employed for measuring the swelling of GMO.



  1. Chang, C. -M. and Bodmeier, R., Binding of drugs to monoglyceride-based drug delivery systems. Int. J. Pharm., 147, 135-142 (1997)
  2. Engstrom, S., Drug delivery from cubic and other lipid-water phases. Lipid Technol., 2, 42-45 (1990)
  3. Engstrom, S., Lindahl, L., Wallin, R., and Engblom, J., A study of polar lipid drug carrier systems undergoing a thermoreversible lamellar-to-cubic phase transition. Int. J. Pharm., 86, 137-145 (1992)
  4. Engstrom, S., Ljusberg-Wahren, H., and Gustafsson, A., Bioadhesive properties of the monoolein-water system. Pharm. Tech. Europe, 7, 14-17 (1995)
  5. Higuchi, T., Mechanism of sustained-action medication: theoretical analysis of rate of release of solid drugs dispersed in solid matrices. J. Pharm. Sci., 52, 1145-1149 (1963)
  6. Hyde, S. T., Andersson, S., Ericsson, B., and Larsson, K., A cubic structure consisting of a lipid bilayer forming an infinite periodic minimal surface of the gyroid type in the glycerol monooleate water system. Z. Kristallogr., 168, 213-219 (1984)
  7. Lee, J. and Kellaway, I. W., Buccal permeation of [D-$Ala^2$, DTable $Leu^5$]enkephalin from liquid crystalline phases of glyceryl monooleate. Int. J. Pharm., 195, 35-38 (2000)
  8. Ofner III, C. M. and Schott, H., Swelling studies of Gelatin I: Gelatin without additives. J. Pharm. Sci., 75, 790-796 (1986)
  9. Panchagnula, R. and Patel, J. R., Transdermal delivery of azidothymidine (AZT) through rat skin ex-vivo. Pharm. Sci., 3, 83-87 (1997)
  10. Sadhale, Y. and Shah, J. C., Glyceryl monooleate cubic phase gel as chemical stability enhancer of cefazolin and cefuroxime. Pharm. Dev. Tech., 3, 549-556 (1998)
  11. Schott, H., Kinetics of swelling of polymers and their gels. J. Pharm. Sci., 81, 467-470 (1992)