Preparation of the microcapsules of Atractylodes chinensis volatile oil and its effect on gastric smooth muscle cell contraction

Atractylodes chinensis volatile oil (ACVO) microcapsules were prepared with chitosan as parietal material. The optimal conditions for encapsulation were investigated by the Response Surface Method (RSM). ACVO microcapsules were characterized by scanning electron microscopy (SEM), particle size analyzer and Fourier Transform infrared spectroscopy (FTIR), respectively. In vitro release properties of ACVO microcapsules were investigated at pH 1.5 and 7.4, respectively. The effects of ACVO microcapsules on the length of rat gastric smooth muscle cells (GSMC), mRNA and protein expression of calmodulin (CaM) and myosin light chain kinase (MLCK) were investigated. Results showed that under optimal conditions, encapsulation efficiency (EE) was 82.19 %. ACVO microcapsules were spherical with a particle size of 1100 nm. ACVO microcapsules had a good release profile at pH 1.5, and the cumulative release within 72 h reached 85.32 %. Cell experiments showed that ACVO microcapsules (0.02, 0.04 μg/mL) had no effect on cell activity, while induced GSMC to contract, and improved the mRNA, protein expressions of CaM and MLCK in GSMC.