纸质食品包装材料中松香酸含量测定 抽提方案的优化

分别采用超声萃取法、微波萃取法、索氏萃取法、NaOH/尿素/硫脲混合碱溶液溶解-超声提取法对纸质食品包装材料中的松香酸进行提取,比较了4种提取方法的提取效果,并对提取产物进行了高效液相色谱法分析,结果表明,经混合碱溶液-超声提取法处理的样品,松香酸含量测定值明显高于其它三种方法。对经4种提取方法提取后的样品进行了电子显微镜分析,结果表明,经超声萃取法、微波萃取法和索氏萃取法处理的样品中均残留有松香酸,而经混合碱溶液-超声提取法处理的样品中未观察到松香酸残留,与高效液相色谱分析的结果一致。

Optimization of extraction method for abietic acid in paper packaging materials intended to come into contact with foodstuffs

Abietic acid in paper packaging materials intended to come into contact with foodstuffs were extracted by ultrasonic extraction technique, microwave-assisted extraction technique, Soxhet extraction technique and sodium hydroxide/urea/thiourea mixed solution-ultrasonic extraction technique, respectively. The extracts were analyzed by high-performance liquid chromatography (HPLC). The extraction effects were compared and the results showed that the detected value of sodium hydroxide/urea/thiourea mixed solution-ultrasonic extraction technique was much higher than the detected values of the other three methods. The extracted samples were all observed by scanning electron microscope (SEM) and the results showed that residual abietic acid was observed in the samples treated by ultrasonic extraction technique, microwave-assisted extraction technique and Soxhet extraction technique but on residual abietic acid was observed in the sample treated by sodium hydroxide/urea/thiourea mixed solution-ultrasonic extraction technique. This result confirmed the results of HPLC analysis.