Department of Pharmaceutical Chemistry, Kulliyyah of Pharmacy, International Islamic University Malaysia, Indera Mahkota, Kuantan 25200, Pahang, Malaysia.
Pharmacognosy Research Group, Kulliyyah of Pharmacy, International Islamic University Malaysia, Indera Mahkota, Kuantan 25200, Pahang, Malaysia.
Biomolecules. 2020 Feb 12;10(2):287. doi: 10.3390/biom10020287.
Stone leaf () is a Southeast Asian medicinal plant that has been traditionally used for the management of diabetes mellitus. The underlying mechanisms of the antidiabetic activity have not been fully explored yet. Hence, this study aimed to evaluate the α-glucosidase inhibitory potential of the hydromethanolic extracts of leaves and to characterize the metabolites responsible for such activity through gas chromatography-mass spectrometry (GC-MS) metabolomics. Crude hydromethanolic extracts of different strengths were prepared and in vitro assayed for α-glucosidase inhibition. GC-MS analysis was further carried out and the mass spectral data were correlated to the corresponding α-glucosidase inhibitory IC values via an orthogonal partial least squares (OPLS) model. The 100%, 80%, 60% and 40% methanol extracts displayed potent α-glucosidase inhibitory potentials. Moreover, the established model identified 16 metabolites to be responsible for the α-glucosidase inhibitory activity of . The putative α-glucosidase inhibitory metabolites showed moderate to high affinities (binding energies of -5.9 to -9.8 kcal/mol) upon docking into the active site of isomaltase. To sum up, an OPLS model was developed as a rapid method to characterize the α-glucosidase inhibitory metabolites existing in the hydromethanolic extracts of leaves based on GC-MS metabolite profiling.
石仙桃 () 是一种东南亚药用植物，传统上用于治疗糖尿病。其降血糖的作用机制尚未完全阐明。因此，本研究旨在评估 的水-甲醇提取物的α-葡萄糖苷酶抑制潜力，并通过气相色谱-质谱联用 (GC-MS) 代谢组学技术来鉴定具有这种活性的代谢产物。制备了不同浓度的粗水-甲醇提取物，并进行体外α-葡萄糖苷酶抑制活性测定。进一步进行 GC-MS 分析，并通过正交偏最小二乘法 (OPLS) 模型将质谱数据与相应的 α-葡萄糖苷酶抑制 IC 值相关联。100%、80%、60%和 40%甲醇提取物均显示出较强的α-葡萄糖苷酶抑制活性。此外，该模型鉴定出 16 种代谢产物可能是 的α-葡萄糖苷酶抑制活性的原因。通过对接进入异麦芽糖酶的活性部位，假定的 α-葡萄糖苷酶抑制代谢产物表现出中等至较强的亲和力（结合能为-5.9 至-9.8 kcal/mol）。总之，建立了一个 OPLS 模型，作为一种基于 GC-MS 代谢组学分析快速鉴定 石仙桃 水-甲醇提取物中α-葡萄糖苷酶抑制代谢产物的方法。
