Characterization of core-shell structures formed by zein

Yi Wang, Chin Ping Su, Matthew Schulmerich, Graciela W. Padua

Research output: Journal article publicationJournal articleAcademic researchpeer-review

45 Citations (Scopus)


Core-shell structures are of interest for encapsulation purposes in the food, pharmaceutical, and cosmetics industries. A number of wall materials are in use including carbohydrates, lipids, and proteins. Zein, the prolamin of corn, is capable of self-assembly into microspheres, potentially useful in encapsulation and delivery systems. In previous work, zein was observed to form core-shell structures with citral and lime by evaporation induced self-assembly of zein in ethanol-water. The objectives of this work were to investigate the effect of mass ratio of core to shell materials and ethanol content of the solvent on encapsulation microstructure. Scanning electron microscopy (SEM), focused ion beam (FIB), and transmission electron microscopy (TEM) were used for structure characterization. Raman spectroscopy and FTIR were used to detect citral or lime in the core. Microstructure images suggested that core-shell structures of zein loaded with lime flavor were formed only in a narrow range of core to shell mass ratio. Ethanol content also affected structure formation.
Original languageEnglish
Pages (from-to)487-494
Number of pages8
JournalFood Hydrocolloids
Issue number2
Publication statusPublished - 1 Mar 2013


  • Citral
  • Core-shell
  • EISA
  • Encapsulation
  • FTIR
  • Lime flavor
  • Raman spectroscopy
  • SEM
  • TEM
  • Zein

ASJC Scopus subject areas

  • Food Science
  • General Chemical Engineering
  • General Chemistry


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