The synergistic antibacterial effect of gymura procumbens (longevity spinach) and samanea saman (rain tree) aqueous crude leaf extracts on staphylococcus aureus and escherichia coli

Date of Completion


Document Type

Capstone Project

Degree Name

Grade 12


Samanea saman, escherichia coli, staphylococcus aureus, longevity spinach, Gynura procumbens, Aqueous extract, Antibacterial, rain tree


Samanea saman (rain tree) and gynura procumbens (longevity spinach) are herbaceous, perennial medicinal plants which have plenty benefits to one's health. Recent studies proved that both plants have an antibacterial property against gram-positive and gram-negative bacteria at a large concentration. The antibacterial activity of both plants at a smaller concentration level of 2.5mg/mL where 2.5mg is the maximum amount of solute that can be dissolved in 1mL of water and their combined extracts was investigated through Kirby-Bauer disc diffusion method against two bacteria: Staphylococcus aureus and Escherichia coli. Individual plants at their varying comcnetrations of 100%, 50% and 25% and their combined extract showed no inhibition against both organisms. This study concludes that at a small concentration, individual plants and their combined extracts have no antibacterial effect. Thus, the use of larger dose or higher concentration is recommended.

First Advisor

Dennis Yu Perona

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