Tannin antioxidants from Osbeckia chinensis
| Autor: | Mitsuo Namiki, Jeng-De Su, Shunro Kawakishi, Toshihiko Osawa |
|---|---|
| Rok vydání: | 1988 |
| Předmět: |
chemistry.chemical_classification
Chromatography Antioxidant Thiocyanate Stereochemistry medicine.medical_treatment Plant Science General Medicine Horticulture Biochemistry chemistry.chemical_compound chemistry medicine Microsome Tannin Casuarinin Gallic acid Methyl gallate Molecular Biology Ellagic acid |
| Zdroj: | Phytochemistry. 27:1315-1319 |
| ISSN: | 0031-9422 |
| DOI: | 10.1016/0031-9422(88)80184-5 |
| Popis: | Six hydrolysable tannins, casuarinin ( 1 ), casuariin ( 2 ), punicacortein A ( 3 ), degalloyl-punicacortein A ( 4 ), 2,3-[( S )-4,4′,5,5′,6,6′-hexahydroxydiphenoyl]- d -glucopyranoside ( 5 ), and 4,6-[( S )-4,4′,5,5′,6,6′-hexahydroxydiphenoyl]- d -glucopyranoside ( 6 ), and related compounds, gallic acid, methyl gallate and ellagic acid, were isolated from the methanol extract of Osbeckia chinensis . In order to confirm the structure-activity relationship, the antioxidant activities of these compounds were examined both in the food model and in vitro systems. The antioxidative efficiency, using the thiocyanate and TBA methods, increased in the order of gallic acid 4 ) 3 ) 5 )=( 6 ) 2 ) 1 )=BHA in vitro antioxidant order is α-tocopherol 4 ) 3 )=( 5 )=( 6 )=ellagic acid 2 ) 1 ) in the rabbit erythrocyte membrane ghost system, and ellagic acid 4 ) 3 )=( 5 )=( 6 ) 2 ) 1 ) = α-tocopherol in the rat liver microsome system. |
| Databáze: | OpenAIRE |
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