Chemical Constituents from Mentha haplocalyx Briq.(Mentha canadensis L.)and Theirα‑Glucosidase Inhibitory Activities

Mentha haplocalyx(Mentha canadensis)is widely used as a medicinal plant in traditional Chinese medicine,and the extracts of its aerial parts are found to signifcantly inhibit the activity ofα-glucosidase with an IC_(50) value of 21.0μg/mL.Bioactivity-guided isolation of the extracts aforded two new compounds(1 and 2),together with 23 known ones(3-25).Their structures were established by extensive spectroscopic analyses(1D and 2D NMR,MS,IR and UV).Compounds 1-17 and 21-25 were evaluated for theirα-glucosidase inhibitory activities.Compound 11 was the most active ones with an IC_(50) values of 83.4μM.These results verify theα-glucosidase inhibitory activity of M.haplocalyx(M.canadensis)and specify its active compounds for the frst time.

安徽产薄荷挥发油提取工艺优化研究

以安徽黄山产阴干薄荷(Mentha canadensis Linnaeus)叶为原料,利用水蒸气蒸馏法对薄荷挥发油的提取工艺进行优化,对料液比、提取时间、浸泡时间、超声时间4个影响因素进行研究。结果表明,在料液比1∶11(g∶mL)、提取3.0 h、浸泡时间2.0 h、超声30 min为最佳提取工艺。在此最佳提取工艺下,挥发油的平均提取率为2.3%。验证试验也表明,该薄荷挥发油提取工艺稳定、可靠。