ABSTRACT
@#The persistence of human diseases challenges the current state of the discovery and production of synthetic drugs. Plants are recognized as a great resource to discover chemical compounds that can be used for drug development. In the Philippines, Ehretia microphylla (tsaang gubat) is recognized by the Department of Health as one of the ten recommended medicinal plants. This article aims to provide a comprehensive review of the traditional use, phytochemical constituents, pharmacologic activities as well as the non-clinical and clinical studies leading to the NIRPROMP formulation of the tsaang gubat tablet indicated for biliary and gastrointestinal pain. Among the phytochemical constituents observed were flavonoids, phenolics, triterpenes, and alkaloids. Evidence for other pharmacologic properties such as antibacterial, anti-angiogenesis, anti-oxidant, anti-inflammatory, anti-allergy, folliculogenesis, wound healing and anti-cancer activities are presented. Currently, tsaang gubat tablet has been granted a full patent for its invention as a tablet for relieving symptoms of biliary and gastrointestinal colic and is registered with the Philippine Food and Drug Administration for these indications. The tsaang gubat tablet is listed in the Philippine National Formulary after the conduct of in vitro, in vivo and Phase I-III clinical trials. Future platforms for research include the reformulation of the existing tsaang gubat drug for other indications, determination of the molecular mechanism of action and plans for plant conservation.
Subject(s)
Phytochemicals , ColicABSTRACT
Background@#Amoebiasis is a global health problem affecting poor regions in the world. Few drugs such as metronidazole are available to treat this disease; unfortunately, it is associated with several serious side effects. Tsaang gubat and ampalaya have been used by traditional healers from different cultures to treat dysentery.@*Objective@#The aim of this research was to provide evidence to validate the use of tsaang gubat and ampalaya leaf extracts for dysentery by determining their anti-amoebic activity.@*Methods@#The tsaang gubat and ampalaya leaves were sourced from the University of the Philippines at Los Baños and processed into a lyophilized aqueous extract. Anti-amoebic activity was determined in an in vitro assay using Entamoeba histolytica HK-9 strain against 10 dose levels (18-10,000 μg/mL). The amoeba and leaf extracts were incubated for 24, 48, and 72 hours. The trophozoites were stained with Trypan blue and dispensed into chambers of a Neubauer hemocytometer. The live trophozoites (unstained) were counted under a binocular microscope. The MIC and IC50 were determined. Metronidazole and DMSO served as positive and negative controls, respectively.@*Results@#Tsaang gubat and ampalaya leaves failed to show anti-amoebic activity and even had increased growth of amoeba at all dose levels. The IC50 of tsaang gubat and ampalaya leaf extracts were >500 μg/mL at 24, 48, and 72 hours. Metronidazole was able to eradicate the amoeba parasite at 24 and 72 hours, while exposure to DMSO did not result in inhibition nor death of the parasite.@*Conclusion@#Tsaang gubat and ampalaya aqueous leaf extracts did not exhibit any anti-amoeba activity.
Subject(s)
Momordica charantia , Antiparasitic AgentsABSTRACT
Background@#Using plants as antimicrobials has long been a practice of traditional healers and validating these customs may lead to the discovery and development of useful herbal medicines.@*Objective@#This study aimed to determine the antibacterial activity of guyabano, tsaang gubat, sambong, and ulasimang bato against common pathogens.@*Methods@#Aqueous or alcoholic leaf extracts of the different medicinal plants were prepared. The solid agar dilution method was used to determine the MIC of guyabano, tsaang gubat, sambong, and ulasimang bato against common pathogens including Staphylococcus aureus, Echerichia coli, Streptococcus pneumoniae, Hemophilus influenzae, Pseudomonas aeruginosa, Salmonella typhi, and Shigella flexneri.@*Results@#The alcoholic leaf extract of guyabano showed moderate activity against oxacillin-sensitive S. aureus with an MIC of 5-6.3 mg/mL. However, tsaang gubat did not exhibit any antibacterial activity for drug-resistant enteric organisms (S. typhi, S. flexneri, and E. coli) and S. aureus at a concentration of 25 mg/mL. Even at a concentration of 100mg/mL, ulasimang bato failed to show any antibacterial activity against drug-resistant S. aureus, S. pneumonia, H. influenzae, E. coli, and P. aeruginosa. Sambong alcoholic extract had some antibacterial activity against penicillin-resistant S. pneumoniae with an MIC of 12.5 mg/mL. @*Conclusions@#Guyabano alcoholic leaf extract showed moderate antibacterial activity against oxacillin-sensitive S. aureus. Sambong alcoholic extract likewise exhibited inhibitory activity against S. pneumoniae. However, tsaang gubat and ulasimang bato aqueous extracts failed to show significant antibacterial activity for the pathogens tested.