摘要
建立了气相色谱-质谱法(GC-MS)同时测定鲜水果中对羟基苯甲酸甲酯、对羟基苯甲酸乙酯、乙萘酚、4-苯基苯酚和联苯醚5种保鲜剂的分析方法。鲜水果样品经乙醚超声提取、浓缩后,活性炭柱净化,选择离子模式(SIM)下测定,外标法定量。在优化条件下,5种保鲜剂的线性范围为0.2～4.0 mg/L,相关系数(r2)大于0.991,联苯醚的检出限为0.05 mg/kg,其余4种保鲜剂的检出限均为0.1 mg/kg。5种保鲜剂的加标回收率为80.4%～104.5%,相对标准偏差(RSD)为1.2%～6.4%。该方法简便、快速、试剂价廉易得,且能消除鲜水果样品中色素等杂质的干扰,具有较高的准确度和精密度,适用于鲜水果中上述5种防腐保鲜剂残留量的测定。
A gas chromatography - mass spectrometric （ GC - MS） methate, ethyl naphthol, 4-phenyod was established to simulta neously detect 5 kinds of fruit preservatives including p-methyl hydroxybenzoate, p-ethyl hydroxy benzol phenol and diphenyl ether. The samples were extracted with e ther, concentrated by nitrogen blowing, and purified with activated carbon column. The analysis of target compounds was performed by GC -MS under the selected ion mode（ SIM）, and quantified by the external standard method. Under the optimized conditions, the calibration curves of the 5 pre servatives were linear in the range of 0.2 - 4. 0 mg/L with correlation coefficients （ r^2 ） more than 0. 991. The spiked recoveries ranged from 80. 4% to 104. 5% with relative standard deviations （ RS- Ds） of 1.2% - 6. 4%. The limit of detection of diphenyl ether was 0. 05 mg/kg, and those of the other analytes were all 0. 1 mg/kg. The method was simple, rapid and eheap, and the impurities like pigments in fruit samples could be diminished with activated carbon column. Therefore, the method was suitable for the determination of the 5 preservatives residues in fresh fruits with high sensi- tivity and selectivity.
出处
《分析测试学报》
CAS
CSCD
北大核心
2013年第8期1007-1011,共5页
Journal of Instrumental Analysis
基金
广东省惠州市科技局资助项目(2011g031)
