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L-quebrachitol is a natural monomethyl ether derivative of inositol, and it is abundant in sea buckthorn leaves. In this study, the potential efficacy on hepatic glucose, lipid metabolism disorder, and damaged pathway in vitro of sea buckthorn leaf L-quebrachitol extract (SQE) and L-quebrachitol standard (QS) was evaluated. The SQE and QS exhibited good inhibitory activity on α-amylase, and the kinetic study revealed that their type of enzyme inhibition was competitive inhibition in each case. Both QS and SQE increased the glucose consumption and decreased the contents of total triglyceride (TG) and non-esterified fatty acid (NEFA) in HepG2 cells displaying insulin resistance (IR). In addition, QS and SQE attenuated the expression levels of G6Pase and enhanced the expression of PPARα. These findings suggested that QS and SQE contributed to the modulation of glucose and lipid metabolism, and they might be a promising functional food additives and pharmaceuticals against Type 2 diabetes mellitus (T2DM).

Sea buckthorn leaf L-quebrachitol extract for improved glucose and lipid metabolism in insulin resistant hepG2 cells