Antibacterial activity against some human pathogenic bacteria and anti-inflammatory activity of five Thai medicinal plant extracts
Keywords:Antibacterial activity, Anti-inflammatory, Human pathogenic bacteria, Thai medicinal plant
Microbial infections often produce pain and inflammation. Inflammation is one common and major cause of sufferings now and every time past. Thai medicinal plants which possess biological activities are potential to develop an alternative agent in pharmaceutical products. This study aims to investigate the antibacterial and anti-inflammatory activities of the aqueous, ethanolic and methanolic extracts from five Thai medicinal plants (Tristaniopsis burmanica, Capparis zeylanica Linn., Markhamia stipulata, Caryota maxima and Amphineurion marginatum). Five Thai medicinal plant extracts were subjected to evaluation of their antibacterial activity against four human pathogenic bacteria, including Vibrio cholerae (clinical), Staphylococcus aureus ATCC25923, Staphylococcus epidermidis ATCC12228 and Escherichia coli ATCC25922 using the agar well diffusion method. The ethanolic and methanolic extracts of five Thai medicinal plants showed capable of inhibiting the growth of one or more tested bacteria. The analysis of the minimum inhibitory concentrations (MICs) which inhibited the four pathogenic bacteria using the broth microdilution assay showed that MICs of the ethanolic and methanolic extracts were ranging from 0.63 mg mL−1 to >10 mg mL−1. Additionally, the anti-inflammatory activity of the extracts was studied using murine macrophage (RAW 264.70) as a model. The results show that the ethanolic and methanolic extracts of Caryota maxima and Amphineurion marginatum showed anti-inflammatory activity by reduced nitric oxide (NO). Also most of the extracts were not toxic to RAW 264.70 cells. The bioactive compounds analysis of the ethanolic and methanolic extract of Amphineurion marginatum was carried out using Gas chromatography-mass spectrometry (GC-MS). The results revealed dominant components were phenol, 3׳-Acetyllycopsamine and lupeol. So, the results of this research directly indicate that the Amphineurion marginatum extracts provide both antibacterial and anti-inflammatory activities, which could be used as a supplementary agent in pharmaceutical products.
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