@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 {603, title = {Chemical Constituents of Cymodocea rotundata Asch. and Schweinf}, journal = {Pharmacognosy Journal}, volume = {10}, year = {2018}, month = {June 2018}, pages = {620-621}, type = {Original Article}, chapter = {620}, abstract = {

Introduction: Cymodocea rotundata Asch. and Schweinf, a widespread seagrass with reported antimicrobial activity, was investigated for its chemical constituents. Methods: The compounds were isolated by silica gel chromatography and identified by NMR spectroscopy. Results: This study has led to the isolation of \β-sitosteryl-3\β-glucopyranoside-6\′-O-fatty acid esters (1), chlorophyll a (2) and a mixture of \β-sitosterol (3a) and stigmasterol (3b) in about 1:1 ratio from the dichloromethane extract of C. rotundata. Conclusion: This is the first report on the isolation of 1-3b from C. rotundata. Compounds 2-3b were reported to exhibit antibacterial activity and may be partly responsible for the reported antimicrobial activity of the C. rotundata extract.

}, keywords = {Chlorophyll, Cymodocea rotundata, Cymodoceaceae, Stigmasterol., β-sitosterol, β-sitosteryl-3β-glucopyranoside-6'-Ofatty acid esters}, doi = {10.5530/pj.2018.4.101}, url = {http://fulltxt.org/article/639}, author = {Judy D. V. Perez and Chien Chang Shen and Consolacion Y. Ragasa} } @article {726, title = {Sterols from Lentinus tigrinus}, journal = {Pharmacognosy Journal}, volume = {10}, year = {2018}, month = {August 2018}, pages = {1079-1081}, type = {Original Article}, chapter = {1079}, abstract = {

Aim: To investigate the chemical constituents of the dichloromethane extract of the fruiting bodies of the mushroom Lentinus tigrinus. Materials and Methods: The chemical constituents of L. tigrinus were isolated by silica gel chromatography, while the chemical structures of the isolated compounds were identified by NMR spectroscopy. Results: The dichloromethane extract of the fruiting bodies of L. tigrinus afforded cerevisterol (1), and a mixture of stellasterol (2) and ergosterol (3) in about 4:5 ratio. Conclusion: To the best of our knowledge, this is the first report on the isolation of 1-3 from the fruiting bodies of L. tigrinus.

}, keywords = {Cerevisterol, Ergosterol, Lentinus tigrinus, Polyporaceae, Stellasterol}, doi = {10.5530/pj.2018.6.182}, author = {Consolacion Y. Ragasa and Maria Carmen S. Tan and Ma. Ellenita De Castro and Mariquit M. De Los Reyes and Glenn G. Oyong and Chien-Chang Shen} } @article {751, title = {A Triterpene and a Depside from Parmotrema austrocetratum Elix and J. Johnst.}, journal = {Pharmacognosy Journal}, volume = {10}, year = {2018}, month = {November 2018}, pages = {s27-s29}, type = {Original Article}, chapter = {s27}, abstract = {

Introduction: Parmotrema austrocetratum Elix and J. Johnst. (syn. Rimelia austrocetrata Elix and J. Johnst.) which belongs to a large genus of lichenized fungi, Parmotrema Massalongo under family Parmeliaceae was investigated for its chemical constituents. Methods: The compounds were isolated by silica gel chromatography and their chemical structures were elucidated by NMR spectroscopy. Results: Chemical investigation of the dichloromethane extract of Parmotrema austrocetratum Elix and J. Johnst. has led to the isolation of zeorin (1) and atranorin (2). Conclusion: P. austrocetratum shares similar chemical characteristic with other Parmotrema species which afforded atranorin. This work highlights the first reported isolation of 1 from P. austrocetratum and the genus Parmotrema.

}, keywords = {Atranorin, Parmeliaceae, Parmotrema austrocetratum, Rimelia austrocetrata, Zeorin}, doi = {10.5530/pj.2018.6s.4}, author = {Consolacion Y. Ragasa and Maria Carmen S. Tan and Virgilio C. Linis and Chien-Chang Shen} } @article {374, title = {Chemical Constituents of Dracontomelon Dao (Blanco) Merr. et Rolfe}, journal = {Pharmacognosy Journal}, volume = {9}, year = {2017}, month = {July 2017}, pages = {654-656}, type = {Original Article}, chapter = {654}, abstract = {

Introduction: The leaves, twigs and flowers of Dracontomelon dao (Blanco) Merr. et Rolfe, an indigenous Philippine tree were investigated for their chemical constituents. Methods: The compounds were isolated by silica gel chromatography and their structures were identified by NMR spectroscopy. Results: Chemical investigation of D. dao led to the isolation of cardol (1), \β-sitosteryl-3\β-glucopyranoside-6, O-fatty acid esters (2), \β-sitosteryl fatty acid esters (3), and a mixture of \β-sitosterol (4a) and stigmasterol (4b) from the petiole; 1, a mixture of 4a and 4b, anacardic acid (5), triacylglycerols (6), monoacylglycerol (7), long-chain fatty acid esters (8), and linoleic acid (9) from the twigs; and a mixture of 4a and 4b, 5, 6, 8, long-chain fatty alcohols (10), and long- chain hydrocatbons (11) from the flowers of D. dao.The structures of 1 and 5 were elucidated by extensive 1D and 2D NMR spectroscopy, while those of 2-4 and 6-11 were identified by NMR spectroscopy. Conclusion: This is the first report on the isolation of 1, 4b and 6-9 from D. dao.

}, keywords = {3-Alkylphenols, Anacardaceae, Anacardic Acid, B-Sitosteryl Fatty Acid Esters, B-Sitosteryl-3β-Glucopyranoside-6{\textquoteright}-O-Fatty Acid Esters, Cardol, Dracontomelon dao (Blanco) merr. Et Rolfe}, doi = {10.5530/pj.2017.5.103}, url = {/files/pj-9-5/10.5530pj.2017.5.103/index.html}, author = {Consolacion Y. Ragasa and Tyson C. Batarra and Julius Leonard A. Vivar and Mariquit M. De Los Reyes and Chien-Chang Shen} } @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} }