Abstract :
Eucalyptus leaves (Melaleuca leucadendra L.) are a type of plant that
has antibacterial properties for Klebsiella pneumoniae, which is a bacteria that
causes respiratory tract infections (ISPA). Eucalyptus leaves have active
compounds thought to have Klebsiella pneumoniae antibacterial activity, namely
flavonoids and phenolic, in the ethanol extract of eucalyptus leaves with a
concentration of 20%. The gel preparations have the advantage of being easy to
dry out, forming a film layer that is easy to wash and gives a cool feeling to the
skin. This study aims to make an optimal eucalyptus leaf ethanol extract gel
formula with variations of carbopol and Na-CMC optimally using the Simplex
Lattice Design (SLD) method. Eucalyptus leaf extraction used the maceration
method with 70% ethanol solvent. Determination of the optimal formula using the
Simplex Lattice Design (SLD) method using Design Expert 10 software with test
parameters for pH, viscosity, adhesion and dispersion power. Verification of the
optimal formula used the One sample t-test, and the stability test was carried out
using the freeze-thaw method. This study provides optimal formula results with a
ratio of 38% carbopol gel base and 62% Na-CMC. The results of the verification
test show that the prediction results with the test results are not significantly
different, indicated by a p value> 0.05, this shows that the formula for the results
of the Simplex Lattice Design (SLD) method is valid as expected including
organoleptic, homogeneity, pH, viscosity, adhesion, and power. spread.