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Keywords:

  • Alginate;
  • electrospray system;
  • encapsulation;
  • pectin;
  • peppermint oil

Summary

This study investigated the microencapsulation of peppermint oil in alginate (A)–pectin (P) matrix using an electrospray system where the microcapsules were characterised by determining their compositions and properties. The minimum size (1.58 μm) was obtained with A80P20, while the maximum (3.24 μm) was obtained with A0P100. The zeta potential ranged from −53.1 to −21.7 mV with all combinations. The polydispersity index (PDI) tended to increase with the pectin content. There was a gradual increase in microparticles in terms of the loss modulus (G′) and the storage modulus (G″) with increasing frequency. The δ value (loss tangent) increased with the pectin content, indicating more unstable. The encapsulation efficiency increased relative to the alginate content. The maximum encapsulation efficiency (85.15%) was obtained with A80P20. This study showed that an electrospray system can be used to make an alginate–pectin microcapsule containing peppermint oil, which has an adequate composition in terms of rheological properties and encapsulation efficiency.