Comparison of Antibacterial Activity of White and Black Kencur Rhizome Juices Against Shigella sp

Kaempferia galanga L. (commonly known as white kencur) is a medicinal plant from the Zingiberaceae family, widely distributed in tropical and subtropical regions. In developing countries such as Indonesia, the use of herbal remedies has gained popularity due to their affordability and abundance. Kencur rhizomes are known to contain various bioactive compounds, including essential oils, saponins, flavonoids, and polyphenols, which are reported to have antibacterial properties. This study aimed to evaluate and compare the antibacterial activity of white kencur (Kaempferia galanga) and black kencur (Kaempferia parviflora) rhizome juices against Shigella sp. using the diffusion method. A quasi-experimental research design was employed. The study population consisted of white and black kencur rhizomes, which were processed into 60% concentration juices. A total of 32 samples were prepared, comprising 16 replicates for each kencur type. The antibacterial activity was assessed by measuring the inhibition zones formed around the samples using the agar diffusion method. The results demonstrated that white kencur juice exhibited antibacterial activity, with an average inhibition zone diameter of 7.5 mm. In contrast, black kencur juice showed no inhibition zone, indicating a lack of antibacterial effect against Shigella sp.