| In vitro: |
| Z Naturforsch C. 2008 Nov-Dec;63(11-12):801-7. | | Activity-guided isolation of antioxidant principles from Limoniastrum feei (Girard) Batt.[Pubmed: 19227826] |
METHODS AND RESULTS:
Bioguided fractionation of a leaves extract from Limoniastrum feei (Girard) Batt. (Plumbaginaceae) led to the isolation of seven polyphenolic constituents: gallic acid (1), Myrciaphenone A (2), myricetin-3-O-beta-galactopyranoside (3-1), epigallocatechin gallate (3-2), myricetin 3-O-alpha-rhamnopyranoside (4), quercetin (5) and myricetin (6).
CONCLUSIONS:
Gallic acid was the most antioxidant compound in DPPH [(0.94 +/- 0.68) microg/mL] and FRAP [(0.83 +/- 0.15) microM Fe2+/mL] tests, whereas myricetin was a more specific superoxide radical scavenger since it was the most active product in the superoxide nitroblue tetrazolium hypoxanthine/xanthine oxidase test [(1.86 +/- 0.12) microg/mL]. | | Chem Pharm Bull (Tokyo). 1998 Jan;46(1):113-9. | | Antidiabetic principles of natural medicines. II. Aldose reductase and alpha-glucosidase inhibitors from Brazilian natural medicine, the leaves of Myrcia multiflora DC. (Myrtaceae): structures of myrciacitrins I and II and myrciaphenones A and B[Pubmed: 9468642] |
METHODS AND RESULTS:
The methanolic extract and ethyl acetate-soluble portion from a Brazilian natural medicine, the leaves of Myrcia multiflora DC., which has been used as a specific medicine against diabetes, were found to show inhibitory activities on aldose reductase and alpha-glucosidase and on the increase of serum glucose level in sucrose-loaded rats and in alloxan-induced diabetic mice. From the ethyl acetate-soluble portion, new flavanone glucosides, myrciacitrins I and II, and new acetophenone glucosides, Myrciaphenone A and myrciaphenone B, were isolated together with several known compounds such as five flavonol glycosides, myricitrin, mearnsitrin, quercitrin, desmanthin-1, and guaijaverin.
CONCLUSIONS:
The structures of new compounds were determined on the basis of physicochemical and chemical evidence. The principal components of this natural medicine including new glucosides, myrciacitrin I and myrciaphenone B, were found to show potent inhibitory activities on aldose reductase and alpha-glucosidase. |
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