Chemical Compositions, and Antimicrobial and Mosquito Larvicidal Activities of Essential Oils from Four Syzygium Species Syzygium formosum (Wall.) Masam., S. syzygioides (Miq.) Merr. & L.M. Perry, S. megacarpum (Craib) Rathakr. & N.C. Nair, and S. chantaranothaianum W.K. Soh & J. Parn

ABSTRACT

Chemical compositions in the leaf essential oils of four Syzygium species were first identified by the GC-FID/MS analysis. Monoterpene hydrocarbons (39.6-51.1%), and sesquiterpene hydrocarbons (27.0-37.8%) were the main chemical classes in S. formosum and S. syzygioides leaf oils, whereas sesquiterpene hydrocarbons (83.0-83.8%) were predominant in S. Megacarpum and S. chantaranothaianum leaf essential oils. Bicyclogermacrene (9.1-37.0%) was the principal compounds in these essential oils. All the tested essential oils with the MIC values of 16-128 µg/mL were comparable to the positive control streptomycin against Gram-positive bacteria Staphylococcus aureus and Bacillus cereus, and Gram-negative bacterium Pseudomonas aeruginosa. The leaf essential oils of S. formosum, S. syzygioides, and S. chantaranothaianum with the MIC values of 16-128 µg/mL were comparable to the positive control cycloheximide against the yeast Candida albicans. Four samples also exhibited good larvicidal activity against the mosquito Aedes aegypti with the 24-h and 28-h LC₅₀ values of 25-40 µg/mL

KEYWORDS:

• Syzygium
• essential oils
• antimicrobial
• mosquito larvicidal

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This research was funded by Ministry of Education and Training, Vietnam, under grant number: B2022-TDV-07.