Background: Curcumin is a well-documented bioactive compound present in Curcuma
sp., a tropical, medicinal plant. This substance exhibits broad-spectrum biological activities, including
antivirus. Despite the lack of pharmaceutical properties of curcumin limits its clinical use.
Objective: This study aims to produce curcumin nanoemulsion with different surface charge (curcumin
(+) nanoemulsion and curcumin (-) nanoemulsion) and to evaluate its physical characteristics,
in vitro cell cytotoxicity, and antiviral activity against dengue virus (DENV) 1 and 2.
Methods: Two forms of nanoemulsion were prepared, which were differed from their surface
charge through spontaneous procedure resulting in similar characteristics except for the zeta potential
value. Cytotoxicity was determined using the RT-PCR method in the A549 cell line, and anti-
DENV properties were determined by calculation of inhibitory concentration 50 (IC50) value.
Results: The positive charge of curcumin-loaded nanoemulsion showed a better effect in reducing
the viral replication represented by a lower IC50 value. In addition, DENV-1 was more sensitive
and responsive to curcumin as compared to DENV-2.
Conclusion: Positive surface charge of curcumin-loaded nanoemulsion improves the antiviral effect
of the curcumin, suggesting a promising approach for alternative treatment for dengue virus infection.