Abstract

The goal of this study was to determine the antibacterial activity and combined effect of a 10% w/v methanol extract of ketepeng cina leaves (Cassia alata) with six selected plant extracts against Staphylococcus epidermidis using the diffusion and paper strip methods. The results revealed that the average antibacterial activity of each extract inhibited the growth of S. epidermidis. The inhibition zones of single extract of C. alata, Excocaria cochinchinensis, Ocinum tenuiflorum, Persea americana, Oroxylum indicum, Impatiens balsamina, and Peronema canescens were 6.28±0.20 mm, 7.90±0.31 mm, 2.30±0.37 mm, 3,53±0.50 mm, 4.35±0.52 mm, and 4.69±0.17 mm, respectively. Furthermore, the combination of ketepeng cina leaves (C. alata) methanol extract with the six selected plants extract in an average diameter of inhibition zone greater than the average diameter of inhibition zone of each extract. However, the combined extract's average diameter of the inhibition zone was not significantly larger than the sum of the diameters of the inhibition zones of each extract. According to the findings of this study, combining the methanol extract of C. alata with six selected plant extracts has an additive/indifferent effect on the growth of S. epidermidis.

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