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  • Title: Identification of Bioactive Substances Derived from the Probiotic-Induced Bioconversion of Lagerstroemia speciosa Pers. Leaf Extract That Have Beneficial Effects on Diabetes and Obesity.
    Author: An BC, Kwak SH, Ahn JY, Won HY, Kim TH, Ryu Y, Chung MJ.
    Journal: Microorganisms; 2024 Sep 06; 12(9):. PubMed ID: 39338524.
    Abstract:
    Lagerstroemia speciosa L. (Banaba) has been used as a functional food because of its diuretic, decongestant, antipyretic, anti-hyperglycemic, and anti-adipogenic activities. Triterpene acids, including corosolic acid, oleanolic acid, and asiatic acid, are the principal phytochemicals in Banaba and are potentially anti-diabetic substances, owing to their effect on blood glucose concentration. Bioconversion of Banaba leaf extract (BLE) by Lactobacillus plantarum CBT-LP3 improved the glucose uptake, insulin secretion, and fat browning of this functional food. Furthermore, we identified asiatic acid, which was found to be increased by 3.8-fold during the L. plantarum CBT-LP3-mediated bioconversion process using metabolite profiling. Most previous studies have focused on corosolic acid, another triterpene acid that is a known anti-diabetic compound and is used to standardize BLE preparations. However, asiatic acid is the second most common of the triterpene acids and is also well known to have anti-diabetic properties. The present study has provided strong evidence that asiatic acid represents an alternative to corosolic acid as the most important active compound. These results suggest that the probiotic-mediated bioconversion of BLE may improve the anti-diabetic effects of this functional food. This implies that the consumption of a probiotic should be encouraged for people undergoing BLE treatment to improve its anti-diabetic effects.
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