Abstract

A fast and facile method was employed for the synthesis of magnetic graphene oxide (MGO). The synthesized MGO is characterized by different techniques and used as a solid-phase adsorbent for the extraction of β-sitosterol from rapeseed oil deodorizer distillates (RODD) followed by gas chromatography-mass spectrometry analysis. Several parameters affecting the extraction efficiency, including the amount of adsorbent, extraction time and temperature, desorption solvent and desorption time, were investigated. The procedure exhibited desirable extraction efficiency within 30 min at 35 °C. Recoveries higher than 80% were obtained with acetone as eluent and the method was successfully applied to concentrate the β-sitosterol in RODD CO₂-supercritical extract. Compared to C18-silica and graphitic carbon, the composite showed satisfactory results for the extraction of β-sitosterol from oil samples.

摘要

一种快速简便的方法被用于合成氧化石墨烯（MGO）。合成的MGO具有不同的技术特征，可作为固相吸附剂从菜籽油脱臭剂馏出物中提取β-谷甾醇，然后进行气相色谱-质谱分析。研究了影响萃取效率的几个参数，包括吸附剂的量，萃取时间和温度，脱附溶剂和脱附时间。该程序在35°C下30分钟内显示出所需的提取效率。以丙酮为洗脱液，回收率达到80％以上，该方法成功地用于将β-谷甾醇浓缩在RODD CO _2中-超临界提取物。与C18二氧化硅和石墨碳相比，该复合物从油样中提取β-谷甾醇具有令人满意的结果。