Comparative Effects of Elettaria cardamomum Essential Oil and Its Nanoliposomal State on Mortality of Anopheles stephensi Larvae

Abstract

Background: Malaria has remained the most dreadful vector-borne disease; hence, vector control is the most affordable and achievable approach to mitigate the disease burden. Due to the emergence of resistance and environmental pollu­tion, herbal larvicides are considered an alternative to chemical types. Also, nanotechnology has been proposed as a prom­ising solution to improve the efficiency of plant larvicides. This study aimed to develop an effective herbal larvi­cide.   Methods: The chemical composition of Elettaria cardamomum essential oil (EO) was first investigated. Nanolipo­somes containing the EO were then prepared using the ethanol injection method. After that, the larvicidal efficacy of the EO and its liposomal state were compared against Anopheles stephensi in laboratory conditions. Results: Alpha-terpinyl acetate (77.59%), eucalyptol (4.38%), nerolidol (2.96%), linalool (1.77%), and limonene (1.69%) were the five major compounds of the EO. Nanoliposomes containing the EO with a particle size of 73±5 nm and a zeta potential of -16.3±0.8 mV were prepared. Additionally, the ATR-FTIR analysis verified the successful load­ing of the EO into nanoliposomes. The larvicidal activity of nanoliposomes exhibited remarkable potency, with an LC50 value of 14.35 (10–18) µg/mL, significantly more potent than the non-formulated EO, which had an LC50 value of 33.47 (28–39) µg/mL against Anopheles stephensi larvae. Conclusion: The nanoliposomes containing E. cardamomum EO showed promising efficacy against An. stephensi lar­vae. It could thus be considered for further application against other species of mosquitoes.