Zhang Xi, Zang Xiaohuan, Zhang Guijiang, Wang Chun, Wang Zhi
Department of Chemistry, College of Science, Agricultural University of Hebei, Baoding, China.
J Sep Sci. 2015 Aug;38(16):2880-6. doi: 10.1002/jssc.201500304. Epub 2015 Jul 14.
A mesoporous carbon was fabricated using MCM-41 as a template and sucrose as a carbon source. The carbon material was coated on stainless-steel wires by using the sol-gel technique. The prepared solid-phase microextraction fiber was used for the extraction of five volatile aromatic compounds (chlorobenzene, ethylbenzene, o-xylene, bromobenzene, and 4-chlorotoluene) from tea beverage samples (red tea and green tea) prior to gas chromatography with mass spectrometric detection. The main experimental parameters affecting the extraction of the volatile aromatic compounds by the fiber, including the extraction time, sample volume, extraction temperature, salt addition, and desorption conditions, were investigated. The linearity was observed in the range from 0.1 to 10.0 μg/L with the correlation coefficients (r) ranging from 0.9923 to 0.9982 and the limits of detection were less than 10.0 ng/L. The recoveries of the volatile aromatic compounds by the method from tea beverage samples at spiking levels of 1.0 and 10.0 μg/L ranged from 73.1 to 99.1%.
以MCM - 41为模板、蔗糖为碳源制备了一种介孔碳。采用溶胶 - 凝胶技术将该碳材料涂覆在不锈钢丝上。制备的固相微萃取纤维用于在气相色谱 - 质谱检测之前，从茶饮料样品（红茶和绿茶）中萃取五种挥发性芳香化合物（氯苯、乙苯、邻二甲苯、溴苯和4 - 氯甲苯）。研究了影响纤维萃取挥发性芳香化合物的主要实验参数，包括萃取时间、样品体积、萃取温度、加盐量和解吸条件。在0.1至10.0 μg/L范围内观察到线性关系，相关系数（r）为0.9923至0.9982，检测限小于10.0 ng/L。该方法对茶饮料样品中挥发性芳香化合物在1.0和10.0 μg/L加标水平下的回收率为73.1%至99.1%。
