a-glucosidase Inhibitors From Paraguayan Natural Medicine, Ñangapiry, The Leaves Of Eugenia Uniflora
2000; Taylor & Francis; Volume: 38; Issue: 4 Linguagem: Inglês
10.1076/1388-0209(200009)3841-aft302
ISSN1744-5116
AutoresTae Matsumura, Mie Kasai, Toshimitsu Hayashi, Munehisa Arisawa, Yasunori Momose, Ichiro Arai, Sakae Amagaya, Yasuhiro Komatsu,
Tópico(s)Phytochemistry Medicinal Plant Applications
ResumoThe water-soluble extract from a Paraguayan natural medicine, Nangapiry, the leaves of Eugenia uniflora L. (Myrtaceae), which has been used as an antidiabetic agent, was found to show inhibitory activities on the increase of plasma glucose level in the sucrose tolerance test (STT) conducted with mice. The portion adsorbed on a cation exchange resin was also found to inhibit a-glucosidases. From the active portion, two new active compounds named uniflorines A ( 1 ) and B ( 2 ) and known (+)-(3a, 4a, 5ß)-1-methylpiperidine-3, 4, 5-triol ( 3 ) were isolated. The structures of uniflorines A and B were determined as (-)-(1S, 2R, 6S, 7R, 8R, 8aR)-1,2,6,7,8-pentahydroxyindolizidine and (+)-(1S, 2R, 5R, 7R, 8S, 8aS)-1,2,5,7,8-pentahydroxyindolizidine by spectral means, respectively.
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