Formation of positively charged microcapsules based on chitosan-lecithin interactions

S. Magdassi*, U. Bach, K. Y. Mumcuoglu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

41 Scopus citations


The formation of microcapsules which contain rosemary oil, is herewith described. The process is based on two steps: (a) formation of oil-in-water emulsions, by using lecithin as emulsifier, thus imparting negative charges on the oil droplets; (b) addition of a cationic biopolymer, chitosan, in conditions that favor the formation of an insoluble chitosan-lecithin complex. Zeta potential measurements revealed that addition of very low concentrations of chitosan to lecithin stabilized emulsions, led to reversal of charge. At a suitable pH range the chitosan precipitated around the oil droplets, forming positively charged microcapsules. The chitosan-lecithin insoluble complex is composed of a 1:1 molar ratio of the chitosan monomeric unit and lecithin, as evaluated by elementary analysis and turbidity measurements.

Original languageAmerican English
Pages (from-to)189-195
Number of pages7
JournalJournal of Microencapsulation
Issue number2
StatePublished - 1997


  • Chitosan
  • Emulsion
  • Lecithin
  • Microcapsule
  • Zeta potential


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