CONSTITUENTS OF THANAKHA STEM BARK The chemical constituents of stem bark are sitosterol , alkaioid ( 4 - methoxv -1 - methyl - 2 - quinolone), lupeol , limonene ,and counmarins .At least coumarins are xanthyletin ,xanthoxyletin , umbelliferone , geranyl umbelliferone isopimpinellin , marmin , marmesin , 7 - methoxy -counmarin (herniarin),superposing ,exoxy superposing ,dithydrosuberenol ,superevene ,crenulatin (6 - forrmyl , 7 - methoxy coumarin ) |
| USES AND APPLICATION Thanakha plants are medicinal and all parts of this plant are very useful in medicine, indigenous medicine , cosmetics and perfumery . Thanakha is used as a natural make - up . The imporatance of this plant from ths medicinal point of view was advocated by many observers. In Myanmar , the paste from bark is used in making a fragrant paste for cosmetic purpose . |
| NATURAL COUMARINS They absorb a wide range of ultraviolet light and generate intense fluorescence (usually blue) . |
| CLASSIFICATION OF NATURAL COUMARINS Natural coumarins are classified as follows : |
| SIMPLE COUMARINS Coumarins substituted with - OH or - OCH at positions C-6 and C -7 . e.g ., Herniarin |
| PYRANOCOUMARINS A Pyran ring is fused at C -6 and C - 7 of the coumarin ring system. e .g ., Xanthoxyletin |
| FURANOCOUMARINS Furanocoumarins are principally found in species of the two plant families mbelliferae and Rutaceae. Furanocoumarin belong to two types furan ring is fused at C - 6 and C -7 (psoralen - type ) or C - 7 and C - 8 (angelicin - type ) or C - 7 and C - 8 (angelicin - type ) of the coumarin ring system. |
| PHYSIOLOGICAL ACTIVITIES OF COUMARINS Coumarins possess several useful physiological properties, it has the antibacterial , antifungal , anticoagulant , respiratory stimulation activities . Some coumarins have anti - arrhythmic action and some are capable of being used against radiation damage. |
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