Abstract
This study reports antidiabetic activity of leaf essential oil (EO) of Cinnamomum travancoricum from the Western Ghats, India via in vitro , in vivo and in silico methods. EO was characterized by GC-MS and GC-FID. Essential oil nanoemulsions (EN) were prepared and characterized. Antidiabetic potential was evaluated through in vitro assays namely, α-amylase and α-glucosidase inhibition, glucose uptake and insulin secretion assays. In vivo study was conducted on STZ-induced diabetic Wistar rats. Molecular docking was conducted to find the lead antidiabetic compounds. Of the 42 compounds identified in the EO, α-phellandrene (5.9%), β-phellandrene (12.6%), linalool (23.6%), safrole (6.8%) and shyobunol (5.1%) were major constituents. Of the two ENs formulated, 1:2 ratio (EO to surfactants) was better in zeta size (51.4 nm) and potential (−30.9). In vitro results were impressive. EN lowered elevated blood glucose level to normal (p < 0.01) and improved the insulin secretion (p < 0.01) in diabetic rats. Further, serum AST, ALT, ALP, triglyceride and pancreatic β-cell damage were seen reduced (p < 0.05). Molecular docking studies showed minor constituents of EO, namely, δ-cadinene, elemol, spathulenol and α-copaen-11-ol playing active role in antidiabetic activity through α-amylase, α-glucosidase, insulin receptor, and insulin secretion proteins.
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