New Phenolics from Linum mucronatum subsp. orientale

Introduction: Lignans and flavonoids are widely distributed phenolics in the plant kingdom. Aryltetralin type lignans (podophyllotoxin derivatives) as the major secondary metabolites of Linum species play an important role in the production of chemotherapy drugs. In the present study, lignans and flavonoid glycosides from aerial parts of Linum mucronatum subsp. orientale were isolated and identified. Methods: The phytochemical investigation has been carried out on Hexane, DCM and MeOH extracts of the plant. Separation of chemical constituents was done using different chromatography (CC, prep-TLC, GC/ MS and HPLC) methods. The major compounds of dichloromethane (DCM) and methanol extracts were isolated and their structures were elucidated using cochromatography in the presence of known lignans, HPLC and NMR techniques. Results: Our results showed that podophyllotoxin and 6-MeO-alpha-peltatin, as new compound, are the major lignans of the DCM extract of L. mucronatum subsp. orientale. Two new flavonoid glycosides were also elucidated in the methanolic extract. Conclusion: The DCM and methanol extracts of L. mucronatum were found to contain aryltetralin-type lignans and flavonoids. The occurrence of 6-MeO-alpha-peltatin and flavonoids in L. mucronatum has been reported for the first time.