Antibacterial and antioxidant lemongrass essential oil Pickering emulsion stabilized by cellulose nanocrystals

  • Hai Yen Nguyen Thi Faculty of Chemical Engineering, Ho Chi Minh City University of Technology (HCMUT)
  • Ly Boi Tuyen Faculty of Chemical Engineering, Ho Chi Minh City University of Technology (HCMUT)
  • Bui Thi Anh Bup Faculty of Chemical Engineering, Ho Chi Minh City University of Technology (HCMUT)
  • Le Anh Kien Institute for Tropical Technology and Environmental Protection, Academy of Military Science and Technology
  • Le Thi Kim Phung Faculty of Chemical Engineering, Ho Chi Minh City University of Technology (HCMUT)
Keywords: Lemongrass essential oil; Cellulose nanocrystals; Pickering emulsion; Antimicrobial; Antioxidant.

Abstract

An effective antibacterial system was developed by using cellulose nanocrystals (CNC) to stabilize lemongrass essential oil Pickering emulsion (PE-LEO) through ultrasonication technology. The factors affecting the formation and stability of PE-LEO were studied, such as ultrasonication times, CNC concentrations, lemongrass essential oil (LEO) concentrations. By size and zeta index, the most suitable sample was 8 ultrasonication times, 0.8% CNC, 15% LEO. The antibacterial and anti-fungal performance of PE-LEO was investigated by determining the minimal inhibitory concentrations (MIC). The results showed that for gram-positive bacteria (E.faecalis, S.aureus, MRSA), the MIC of PE-LEO was much higher than LEO, the opposite was true for gram-negative bacteria (E. coli) and fungi. Based on the concentrations of LEO, with IC50 of PE-LEO is 0.30% vLEO/v, which is significantly lower than that of LEO (0.99%). The CNC-stabilized PE-LEO exhibited higher antioxidation activity at equivalent LEO concentrations. The fabricated CNC based Pickering emulsions provide a promising alternative for the delivery of antimicrobial essential oils in the food industries.

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Published
2023-08-25
Issue
Vol. 89 (2023)
Section
Overview