关键词: 植物甾醇, 羟丙基-β-环糊精, 包合, 溶解度

Abstract: In this study, phytosterol (PS) was included with hydroxypropyl-β-cyclodextrin (HP-β-CD) to improve its solubility and thereby broaden the range of its application in the food industry. The inclusion complex was tested by differential scanning calorimetry (DSC), Fourier transform infrared (FT-IR) spectroscopy and X-ray diffraction. The inclusion process was optimized using response surface methodology. The optimum conditions obtained were as follows: molar ratio between PS and HP-β-CD, 4.27:1; temperature, 47 ℃; and inclusion time, 11.93 h, yielding an inclusion rate of 96.57%. However, to improve operating convenience, these parameters were modified as 4.30:1, 47 ℃, and 12 h, respectively. Triplicate experiments carried out under these conditions gave an average inclusion rate of up to 97.25%. At 37 ℃, the water solubility of HP-β-CD/PS clathrate reached an average of 8.31 mg/mL, which was 307.90 times of its original solubility (0.027 mg/mL).

Key words: phytosterol, hydroxypropyl-β-cyclodextrin, inclusion, solubility