@article {945, title = {Glucosinolates, Degradation Products and Myrosinase Activity in Raphanus sativus Linn.}, journal = {Pharmacognosy Journal}, volume = {11}, year = {2019}, month = {September 2019}, pages = {866-872}, type = {Original Article}, chapter = {866}, abstract = {

This research was conducted to assess the gluocosinolate (GSL), isothiocyanate (ITC) and myrosinase content in two cultivars of Raphanus sativus Linn. (white and red) roots. LC-ESIMS investigation was done on desulfated GSLs since this methodology has been previously established for efficient GSL analyses. The major GSLs: sinigrin (1) 1,2-dihydroxy-2-phenylethyl glucosinolate (2), 4-hydroxyglucobrassicin (3), glucoraphasatin (4) and 4-methoxyglucobrassicin (5) were found in red radishes; whereas, only 1 and 4 were obtained in white radishes. Myrosinase was analyzed in the tubers due to its ability to catalyze and hydrolyze GSLs into ITCs. This β-thioglucosidase enzyme was found to be over 10 times more active in red tubers (2.05E-02 units) than in white radishes (1.55E-03 units) and the results were linked to the presence/absence of the outer covering of the tubers. Due to the promising medicinal properties of the aglucone derivative of compound 4, 4-methylthio-3-butenyl isothiocyanate (6), the ITC analog was monitored using gas chromatographic mass spectral analyses after myrosinase-mediated hydrolysis. From the results, it can be construed that the occurrence of GSLs 1-5 and the bioactive agent 6 were inherent in the R. sativus cultivars evaluated.

}, keywords = {GC-FID, GC-MS, Glucosinolates, Isothiocyanates, LC-ESI-MS, Myrosinase}, doi = {10.5530/pj.2019.11.139}, author = {Maria Carmen S. Tan and Marissa G. Noel} } @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} }