Water Chestnut (Trapa japonica Flerov.) Exerts Inhibitory Effect on Postprandial Glycemic Response in Rats and Free Radical Scavenging Activity in vitro
- Authors
- Kang, Ming-Jung; Lee, Soo-Kyung; Song, Ji-Hyun; Kim, Mi-Eun; Kim, Myo-Jeong; Jang, Joung-Soon; Lee, Jai-Hyun; Kim, Jung-In
- Issue Date
- Jun-2009
- Publisher
- KOREAN SOCIETY FOOD SCIENCE & TECHNOLOGY-KOSFOST
- Keywords
- alpha-glucosidase; antioxidant effect; postprandial hyperglycemia; Trapa japonica Flerov.
- Citation
- FOOD SCIENCE AND BIOTECHNOLOGY, v.18, no.3, pp 808 - 812
- Pages
- 5
- Journal Title
- FOOD SCIENCE AND BIOTECHNOLOGY
- Volume
- 18
- Number
- 3
- Start Page
- 808
- End Page
- 812
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/23164
- ISSN
- 1226-7708
2092-6456
- Abstract
- The alpha-glucosidase inhibitory and antioxidant effects of water chestnut (Trapa japonica Flerov.) were assessed to explore its possible use as an anti-diabetic agent. Methanol extracts of the fruit shell and meat of water chestnut were assayed for inhibitory activity against yeast a-glucosidase and 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical. scavenging activity. Effect of fruit shell extract on postprandial glucose response was assessed. Compared with fruit meat, shell extract showed stronger inhibition against alpha-glucosidase with an IC50 of 273 mu g/mL. Oral administration of fruit shell extract (500 mg/kg) significantly lowered the postprandial area under the glucose response curve to starch (1 g/kg) in streptozotocin (STZ)-induced diabetic rats (p<0.01). Compared with fruit meat, shell extract showed stronger scavenging activity against DPPH, with an IC50 of 27.1 mu g/mL. The results indicate that the fruit shell of water chestnut was effective in controlling postprandial hyperglycemia and exerted an antioxidant effect. Therefore, water chestnut may be useful in treating diabetes.
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