@article {1891, title = {Chemical Profiling and In Vitro α-amylase Antidiabetic Assessment of Carissa Macrocarpa Flower Extract Cultivated in Saudi Arabia}, journal = {Pharmacognosy Journal}, volume = {14}, year = {2022}, month = {December 2022}, pages = {759-765}, type = {Original Article }, chapter = {759}, abstract = {

Carissa macrocarpa is commonly known as Natal plum. Its fruits are palatable and used in manufacture of jams while other parts of the plant are used in traditional medicine to treat various diseases. The main objective of current study was to screen the presence of and isolate the various phytochemicals applying standard procedures and to evaluate the in vitro antidiabetic activity using α-amylase inhibitory assay. The total methanol extract of flower (TMEF) of Carissa macrocarpa was subjected to several chromatographic procedures. Results demonstrated that TMEF of Carissa macrocarpa is characterized by the content of different constituents such as flavonoids, steroids, saponins, tannins and carbohydrates at different levels. Chromatographic isolation led to the isolation of kaempferol-3-O-robinobioside and caffeic acid, which were confirmed via using 1H, 13C, DEPT, COSY, HMQC and HMBC NMR spectroscopic analyses. TMEF exhibited α-amylase inhibitory activity with IC50 value of 65.4 μg/ml when compared to that of the acarbose (standard) (IC50 = 39.6 μg/ml). In conclusion, current investigation endorses the traditional use of Carissa macrocarpa as antidiabetic herb. Hence, the studied TMEF of Carissa macrocarpa may have the potential being nutraceuticals products for pharmaceutical applications as antidiabetic herbal remedy.

}, keywords = {Antidiabetic, Apocynaceae, Caffeic acid., Carissa macrocarpa, α-amylase inhibitory}, doi = {10.5530/pj.2022.14.164}, author = {Duaa Adnan Alghafli and Zeneb Ali Albahrani and Fatemah Hussain Alnasser and Aldanah Ibrahim Alnajdi and Gharam Mohammed Alanazi and Hussein Ali Burshed and Marwan Mohamed Alshawush and Hany Ezzat Khalil} } @article {785, title = {Triterpenes and Sterols from Leaves of Hoya meliflua Merr}, journal = {Pharmacognosy Journal}, volume = {11}, year = {2019}, month = {January 2019}, pages = {48-52}, type = {Original Article}, chapter = {48}, abstract = {

Introduction: Hoya plants are also called wax plants due to the waxy appearance of their leaves and flowers. Most species are cultivated as ornamental plants. In the Philippines, there are at least 109 species of Hoya; 88 of these are endemic to the country. One of the endemic species is Hoya meliflua often confused with H. diversifolia, which can also be found in other countries. This study is part of our research on the chemical constituents of Philippine native Hoyas. Methods: The compounds were isolated by silica gel chromatography and identified by NMR spectroscopy. Results: Chemical investigation of the dichloromethane extract from the leaves of Hoya meliflua afforded squalene and mixtures of β-amyrin (1a), α-amyrin (1b) and lupeol (1c) in about 1:1:0.25 ratio; oleanone (2a), ursenone (2b) and lupenone (2c) in about 1:1:0.3 ratio; β-amyrin cinnamate (3a), α-amyrin cinnamate (3b) and lupenyl cinnamate (3c) in about 0.5:0.3:1 ratio; and β-sitosterol and stigmasterol in about 5:1 ratio. Conclusion: The results of our study indicate that Hoya meliflua shares similar chemical characteristics with other members of the genus Hoya. The triterpenes and sterols obtained from H. meliflua were also identified from other Hoya species. It is interesting to note that although most Hoya plants have no known biological activity and medicinal property, the compounds isolated from H. meliflua possess diverse bioactivities.

}, keywords = {Apocynaceae, Hoya meliflua, Lupenone, Lupenyl Cinnamate, Lupeol, Oleanone, Squalene, Stigmasterol, Ursenone, α-amyrin, α-amyrin Cinnamate, β-amyrin, β-amyrin Cinnamate, β-sitosterol}, doi = {10.5530/pj.2019.1.9}, author = {Vincent Antonio S. Ng and Raymond S. Malabed and Fernando B. Aurigue and Consolacion Y. Ragasa} } @article {218, title = {Cytotoxic Compounds from Kibatalia gitingensis (Elm.) Woodson}, journal = {Pharmacognosy Journal}, volume = {9}, year = {2017}, month = {December 2016}, pages = {8-13}, type = {Original Article}, chapter = {8}, abstract = {

Ursolic acid (1), squalene (2), a mixture of \α-amyrin acetate (3a) and lupeol acetate (3b), and isoscopoletin (4), isolated from the dichloromethane extracts of the leaves and twigs of Kibatalia gitingensis, were evaluated for their cytotoxic activities against three human cancer cell lines, breast (MCF-7) and colon (HT-29 and HCT-116), and a normal cell line, human dermal fibroblast-neonatal (HDFn), using the in vitro PrestoBlue cell viability assay. Compounds 1-4 exhibited strong cytotoxic activities against HT-29 cells with IC50 values ranging from 0.6931 to 1.083 \μg/mL. Furthermore, 1-4 were moderately cytotoxic against HCT-116 cells with IC50 values ranging from 4.065 to 11.09 \μg/mL. These compounds were least cytotoxic against MCF-7 cells with IC50 values ranging from 8.642 to 25.87 \μg/mL. The most cytotoxic against HT-29 cells, HCT-116 cells and MCF-7 cells are 2, 4 and 1, respectively.

}, keywords = {Apocynaceae, Cytotoxicity, HCT-116, HDFn, HT-29, Isoscopoletin, Kibatalia gitingensis, Lupeol acetate, MCF-7, PrestoBlue{\textregistered} cell viability assay., Squalene, Ursolic acid, α-amyrin acetate}, doi = {10.5530/pj.2017.1.2}, author = {Mariquit M. De Los Reyes and Glenn G. Oyong and Vincent Antonio S. Ng and Chien-Chang Shen and Consolacion Y. Ragasa} } @article {196, title = {Triterpenes from Hoya paziae Kloppenb.}, journal = {Pharmacognosy Journal}, volume = {8}, year = {2016}, month = {Oct 2016}, pages = {487-489}, type = {Original Article}, chapter = {487}, abstract = {

Chemical investigation of the dichloromethane extracts of the stems of Hoya paziae Kloppenb. led to the isolation of taraxerol (1), taraxeryl acetate (2), and a mixture \α-amyrin acetate (3), and \β-amyrin acetate (4) in about 2.5:1 ratio. The structures of 1\–4 were identified by comparison of their NMR data with those reported in the literature.

}, keywords = {Apocynaceae, Hoya paziae, taraxerol, taraxeryl acetate, α-amyrin acetate, β-amyrin acetate}, doi = {10.5530/pj.2016.5.13}, author = {Melissa Borlagdan and Fernando B. Aurigue and Ian A. Van Altena and Consolacion Y. Ragasa} }