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Chromatographic fingerprinting and free-radical scavenging activity of ethanol extracts of Muntingia calabura L. leaves and stems

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Asian Pacific Journal of Tropical Biomedicine 2017年第2期7卷 139-143页

作者： william patrick cruiz buhian Raquel Orejudos Rubio Juliana Janet Martin-Puzon Biological Research and Services Laboratory Natural Sciences Research InstituteUniversity of the PhilippinesDilimanQuezon City 1101Philippines Institute of Biology University of the PhilippinesDilimanQuezon City 1101Philippines

Objective: To determine the thin-layer chromatography(TLC) fingerprint profiles and to evaluate the in vitro antioxidant activity of ethanol extracts of Muntingia calabura(M. calabura) leaves and ***: The leaves and stems were extracted using ethanol as solvent. The TLC separation of the phytochemical constituents of the leaf and ethanol extracts was carried out in ethyl acetate: n-hexane and chloroform: ethyl acetate mobile phase *** spots were visualized under visible light, UV 254 nm, UV 366 nm and after spraying with vanillin-sulfuric acid. The 2,2-diphenyl-1-picrylhydrazyl free-radical scavenging assay was used to evaluate the antioxidant activity of the ***: Both the leaf and stem ethanol extracts at 4 mg/mL exhibited 2,2-diphenyl-1-picrylhydrazyl inhibition of more than 90%, relative to gallic acid. The results of TLC showed that the degree of resolution between the constituent spots was comparable between the two mobile phase systems using the different visualization wavelengths. Under the 254 nm visualization, few spots were observed in leaf and stem extracts. Visualization at 366 nm yielded the greatest number of observable spots of various colors in both leaf and stem extracts. More spots were visualized upon post-derivatization with vanillinsulfuric acid in the TLC chromatograms using chloroform: ethyl acetate mobile phase,compared to those in ethyl acetate: n-hexane mobile ***: M. calabura exhibited very high antioxidant activity in its leaves and stems ethanol extracts, both of which are used in traditional medicine. The TLC results demonstrated the presence of diverse secondary metabolites in the leaf and stem ethanol extracts, indicating that the antioxidant activity, including other bioactivities may be attributed to these phytochemical constituents. This paper has reported for the first time the TLC fingerprinting of M. calabura using visible light, UV 254 nm, UV 366 and postderivatization with vani

关键词： Muntingia calabura Antioxidant DPPH Thin-layer chromatography Secondary metabolites

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Bioactive metabolite profiles and antimicrobial activity of ethanolic extracts from Muntingia calabura L. leaves and stems

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Asian Pacific Journal of Tropical Biomedicine 2016年第8期6卷 682-685页

作者： william patrick cruiz buhian Raquel Orejudos Rubio Demetrio Lim Valle Jr. Juliana Janet Martin-Puzon Natural Sciences Research Institute University of the Philippines Institute of Biology University of the Philippines Department of Pathology and Laboratories Makati Medical Center

Objective: To determine the bioactive phytochemicals and antimicrobial activity of leaf and stem ethanolic extracts from Muntingia calabura L.(M. calabura).Methods: Dried leaves and stems of M. calabura were extracted with 95% ethanol. The antibacterial and antifungal activities of the extracts were examined using the disc diffusion assay. The minimum inhibitory concentration(MIC) of each extract showing antimicrobial activity was determined. The dried extracts were subjected to phytochemical screening to determine the presence of bioactive components. Total phenolic and flavonoid contents were also determined by the Folin–Ciocalteu method and the aluminum chloride method, ***: Varying degrees of antimicrobial activity were exhibited by the leaf and stem extracts against Pseudomonas aeruginosa(P. aeruginosa), Salmonella typhimurium,Staphylococcus aureus(S. aureus), Bacillus subtilis, and Candida albicans(C. albicans),with minimal activity against Escherichia coli. Based on the MIC, the extracts showed the highest activity against C. albicans, S. aureus and P. aeruginosa. Phytochemical screening revealed the presence of sterols, flavonoids, alkaloids, saponins, glycosides and tannins in the leaf extract; however, no triterpenes were detected. In the stem extract,triterpenes were detected along with relative amounts of flavonoids, saponins, glycosides and tannins. Alkaloids and sterols were absent in the stem ***: M. calabura leaf and stem ethanol extracts are potential sources of antibacterial agents against P. aeruginosa and S. aureus. This study reports for the first time the high degree of antifungal activity of M. calabura ethanolic extract, especially against C. albicans.

关键词： Antibacterial Antifungal Bioactive metabolites Disc diffusion Minimum inhibitory concentration Muntingia calabura

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