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ISSN: 2375-4338

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Research Article

Purple Rice Extract Exhibits Preventive Activities on Experimental Diabetes Models and Human Subjects

Hiroshi Shimoda*, Michio Aitani, Junji Tanaka and Shoketsu Hitoe
Oryza Oil & Fat Chemical Co. Ltd., 1 Numata, Kitagata-cho, Ichinomiya, Aichi 493-8001, Japan
Corresponding Author :

Hiroshi Shimoda
Research and Development Division
Oryza Oil & Fat Chemical Co., Ltd.
1 Numata, Kitagata-cho
Ichinomiya, Aichi 493-8001, Japan
Tel: +81-586-86-5141
Fax: +81-586-86-6191

E-mail: [email protected]

Received January 06, 2015; Accepted January 27, 2015; Published February 01, 2015
Citation: Shimoda H, Aitani M, Tanaka J, Hitoe S (2015) Purple Rice Extract Exhibits Preventive Activities on Experimental Diabetes Models and Human Subjects. J Rice Res 3:137. doi: 10.4172/2375-4338.1000137
Copyright: © 2015 Shimoda H, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
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Abstract

Purple rice is colored rice containing anthocyanins and has mainly been consumed in Southeast Asian countries.
Consumption of a large amount of rice would cause undesirable effects in patients with diabetes or high blood
glucose. However, if the colored ingredients have antidiabetic effects, purple rice consumption may be an effective
alternative dietary approach to prevent diabetes, instead of white rice. Thus, we evaluated the effect of Purple Rice
Extract (PRE) on various diabetes models. PRE inhibited α-glucosidase, α-amylase and aldose reductase activities
with IC50 values of 409, 135 and 26 μg/mL, respectively. In a diabetic retinopathy model using retinal microvascular
endothelial cells, PRE (30 μg/mL) significantly suppressed cell damage induced by a high concentration of glucose.
On the other hand, PRE significantly delayed starch and sucrose absorption at 3 and 1 g/kg, respectively, in rats.
Moreover, single oral dosing of PRE (25 mg) to human subjects significantly suppressed postprandial blood sugar
elevation after the ingestion of rice (200 g). These results suggest that PRE is effective for the control of blood sugar
to prevent the progression of diabetic symptoms.

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