Background. This study describes antimicrobial, anticancer and antioxidant properties of Sauropus androgynus stem extract. The main objective of the present study was to reveal the potential of S. androgynus strip to be used as a medicinal drug.Materials and methods. The antimicrobial properties of S. androgynus stem extract against Aeromonas hydrophila, Escherichia coli, Edwardsiella tarda, Flavobacterium sp., Klebsiella sp., Salmonella sp., Vibrio alginolyticus, V. parahaemolyticus, V. cholerae and Pseudomonas aeruginosa were revealed by using the broth micro-dilution method, whereas the anticancer effects of the extract was determined with a colorimetric MTT (tetrazolium) assay against human breast adenocarcinoma (MCF-7). The antioxidant activity of the plant extract was characterized also by using a α, α-diphenyl-β-picrylhydrazyl (DPPH) radical scavenging method. Finally, chemical compounds of the plant extract were screened and identified by using gas chromatography -mass spectrometry (GC-MS).Results. The minimum inhibitory concentration (MIC) values ranged from 7.81 to 62.5 mg/l in which the plant extract was found to inhibit the growth of Edwardsiella tar da, Escherichia coli, Flavobacterium sp., Pseudomonas aeruginosa and Vibrio cholerae at 7.81 mg/l, Klebsiella sp., Aeromonas hydrophila and Vibrio alginolyticus at 15.6 mg/l, and it was able to control the growth of Salmonella sp. and Vibrio parahaemolyticus at 62.5 mg/l. The results of the present study has shown S. androgynus stem extract to possess a high antimicrobial activity and a moderate antioxidant activity (inhibition concentration 50%; IC 50 of DPPH is 8 ppt), but no anticancer activity. A total of 34 compounds were identified in the plant extract in which the major compounds were 9, 12, 15-octadecatrienoic acid, methyl ester, (Z, Z, Z)-(14.48%) and phytol (13.08%).Conclusions. S. androgynus stem extract can be used as an antimicrobial and antioxidant agents.

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Abstract:In vitro and in vivo studies of the activity of Phaleria macrocarpa Boerl (Thymelaeaceae) leaves against the therapeutic target for hypercholesterolemia were done using the HDL receptor (SR-BI) and hypercholesterolemia-induced Sprague Dawley rats. The in vitro study showed that the active fraction (CF6) obtained from the ethyl acetate extract (EMD) and its component 2',6',4-trihydroxy-4'-methoxybenzophenone increased the SR-BI expression by 95% and 60%, respectively. The in vivo study has proven the effect of EMD at 0.5 g/kgbw dosage in reducing the total cholesterol level by 224.9% and increasing the HDL cholesterol level by 157% compared to the cholesterol group. In the toxicity study, serum glutamate oxalate transaminase (SGOT) and serum glutamate pyruvate transaminase (SGPT) activity were observed to be at normal levels. The liver histology also proved no toxicity and abnormalities in any of the treatment groups, so it can be categorized as non-toxic to the rat liver. The findings taken together show that P. macrocarpa leaves are safe and suitable as an alternative control and prevention treatment for hypercholesterolemia in Sprague Dawley rats.

This study was carried out to characterize antimicrobial, antioxidant and anticancer activities of Michelia champaca seed and flower extracts. The main objective of the present study was to reveal the medicinal values of M. champaca seed and flower for human uses. Antimicrobial property of M. champaca seed and flower extracts were revealed by using two fold microdilution method whereas antioxidant activity of the extract was determined with DPPH radical scavenging method. The anticancer property of the plant extract was revealed through Colorimetric MTT (tetrazolium) assay. The minimum inhibitory concentration values of M. champaca seed and flower extracts ranged from 15.6 to 125mg/l and 7.8 to 62.5mg/l, respectively in which both of the plant extracts were found can inhibit the growth of all the tested bacterial isolates namely A. hydrophila, E. tarda, E. coli, Flavobacterium sp., Klebsiella sp., P. aeruginosa, Salmonella sp., V. alginolyticus, V. cholerae and V. parahaemolyticus. M. champaca flower extract was able to control the growth of E. tarda, E. coli, Flavobacterium sp., P. aeruginosa and V. cholerae at the concentration of 7.8mg/l whereas A. hydrophila, Klebsiella sp. and V. alginolyticus were failed to grow at the concentration 15.6mg/l. The M. champaca flower extract was also able to control the growth of Salmonella sp. and V. parahaemolyticus at the concentration of 62.5mg/l. At the maximum concentration of M. champaca seed and flower extracts were found can inhibit only 40% of DPPH whereas the IC50 value of M. champaca seed and flower extract against MCF-7 cells was 1.98 ±0.31µg/ml and 1.86 ± 0.21µg/ml, respectively. A total of 9 chemical compounds were successfully identified in M. champaca's flower extract whereas 37 chemical compounds were found in the leaf extract. The findings of the present study indicated that medicinal values of M. champaca seed & flower extracts in terms of antimicrobial and anticancer are promising.

Gracilaria species are red marine macroalgae that are found abundantly in Malaysia. Gracilaria changii from Morib, Selangor, G. manilaensis and Gracilaria sp. from Gelang Patah, Johor were used in this study. Five compounds were successfully isolated and identified as hexadecanoic acid (1), cholest-5-en-3-ol (2), 2-hydroxymyristic acid (3), cholesteryl myristate (4) and 1-(4'-methoxyphenyl)-3-(2”,4”,6”-trihydroxyphenyl)-3-hydroxypropanone (5) based on spectral data analysis (IR, UV, GC-MS, 1H NMR, 13C NMR, HMQC and HMBC). All compounds isolated were tested for cytotoxicity (MTT assay for HL-60 and MCF-7 cell lines), and antibacterial (disc diffusion method), antioxidant (DPPH free radical scavenging assay and xanthine oxidase inhibitory assay) and acetylcholinesterase inhibitory (AChE) activity (TLC bioautographic method). Compounds 1 and 3 exhibited strong cytotoxic activity against HL-60 and MCF-7 cell lines. Compound 5 showed high antioxidant activity in both the DPPH free radical scavenging and xanthine oxidase inhibition assays. Compound 1 showed positive activity for AChE inhibitory with a minimum inhibition dose of 0.625 μg sample. All compounds demonstrated antibacterial activity producing 8 to 14 mm inhibition zones. A positive control was applied to all bioassays and experiments were performed with three replicates. Results demonstrated that three edible red seaweeds are rich sources of bioactive compounds with potential application for pharmaceutical purposes.