超高效液相色谱/静电场轨道阱高分辨质谱法同时测定塑料食品接触材料中光稳定剂和抗氧化剂的特定迁移量

建立了超高效液相色谱/静电场轨道阱高分辨质谱同时测定塑料食品接触材料中多种光稳定剂和抗氧化剂特定迁移量的方法。采用30 g/L乙酸、体积分数分别为10%、20%、50%的乙醇和油类模拟物(异辛烷)这5种食品模拟物对塑料食品接触材料进行处理,对处理液进行超高效液相色谱/静电场轨道阱高分辨质谱分析,外标法定量。该方法测定的40种目标化合物在相应的范围内均具有良好的线性关系,相关系数均大于0.998,定量限为0.01~1.00μg/L。考察了上述5种食品模拟物中光稳定剂和抗氧化剂的特定迁移量,平均加标回收率为81.46%~94.53%,相对标准偏差为3.25%~9.99%。应用该方法对市售塑料食品接触材料进行了测定,结果在部分样品中检出了不同含量的光稳定剂和抗氧化剂。该方法灵敏度高,定量限低,满足塑料食品接触材料中光稳定剂和抗氧化剂特定迁移量的检测要求。     

Integrated sample-pretreatment strategy for separation and enrichment of microplastics and primary aromatic amines in the migration of teabag

In this work, an integrated sample-pretreatment strategy for the separation and enrichment of microplastics and primary aromatic amines from the migration of teabag was developed. The migration solution of teabag was passed through a homemade device. The microplastics were firstly captured by a silver membrane, and then the primary aromatic amines were enriched by a solid-phase extraction column. The microplastics migrated from teabag were detected by attenuated total reflection-Fourier transform infrared spectrometer and Raman spectroscopy. The data showed the character, the number of particles, area ratio, and morphology of microplastics migrated from the teabag. Subsequently, after the enrichment procedure, a sensitive analytical method for primary aromatic amines was established followed by ultra-high performance liquid chromatography-tandem mass spectrometry. The method showed wide linear ranges with R² greater than 0.9915, low limits of detection (2–18 ng/L), and low limits of quantification (8–50 ng/L). The developed method was adopted to analyze microplastics and primary aromatic amines migrated from nylon and polyethylene terephthalate teabag under different temperatures and times. The integrated sample-pretreatment strategy displayed promising potentials in the one-step preparation of the microplastics and hazardous molecules in the sample of environment and food security.     

FLAME ATOMIC ABSORPTION DETERMINATION OF COPPER IN CEREALS FOOD SAMPLES WITH THE PRECONCENTRATION OF POTASSIUM TETRATITANATE WHISKER

A simple and reliable method has been developed for separation and preconcentration of trace amounts of copper ions in cereals food for subsequent measurement by flame atomic absorption spectrometry （FAAS）. The Cu^2＋ ions are adsorbed selectively and quantitatively during the passage. The retained copper ions were desorbed from the potassium tetratitanate whisker with 10.0mL of 2mol/L sulphuric acid solutions as eluent and were determined by FAAS. The linear range was 0.05μg/mL-0.20μg/mL in the original solution with a correlation coefficient of 0.9998. The detection limit of the proposed method is 2. lng/mL in the original solution （3σ, n=9）. Determination of copper in standard ions showed that the proposed method has good accuracy （recovery was more than 95%）. The method was successfully applied for recovery and determination of copper in cereals food samples     

动物源性食品中磺胺类药物增效剂残留的高效液相色谱-串联质谱法测定

利用高效液相色谱-电喷雾串联质谱测定了蜂蜜、蜂王浆、鮰鱼、鳗鱼、猪肉、猪肾、猪肝、鸡肉、牛肉和牛奶中的三甲氧苄氨嘧啶、二甲氧苄氨嘧啶和奥美普林3种磺胺类药物增效剂.除蜂王浆基质直接用10%三氯乙酸溶液提取外,其余基质均用10%三氯乙酸-乙腈(体积比7 : 3)混合溶液提取,提取溶液过阳离子交换固相萃取柱进行富集和净化.采用C18色谱柱,流动相为甲醇和0.1%甲酸溶液.选择1个母离子和2个子离子进行反应监测,对3种磺胺类药物增效剂残留进行定性,选择信号最强的子离子进行定量.在2 ～100 μg/L范围内,分析物的线性相关系数r>0.992.通过实际样品添加回收实验,所有基质定量下限为5.0 μg/kg,3个添加水平的回收率为63% ～89%,相对标准偏差为3.2% ～6.9%.     

保健食品中铬及其化合物的应用研究

对铬及其化合物辅助降血糖、降血脂、减肥、延缓衰老、增强免疫力等生理功能、作用机制及其在保健食品中的使用情况进行了阐述,为其在未来的保健食品中得到更好应用提供依据。     

液相色谱在食物和中药中的农药残留分析中的应用

综述了近年来液相色谱分析方法在食物和中药中农药残留分析中的应用,对各种常用的在线和离线样品预浓缩技术、检测器以及液相色谱与质谱等仪器的联用进行了讨论,并对液相色谱在农药残留分析中的应用前景进行了评价。     

脂肪酸的色谱保留时间规律与质谱特征研究及其在食品分析中的应用

用石油醚提取食品中的脂肪,经甲酯化反应后,采用HP-88(100m×0.25mm,0.33μm)弹性石英毛细管柱分离脂肪酸甲酯的同系物及异构体,GC/MS法测定。研究了不同链长脂肪酸的同系物及异构体的气相色谱出峰顺序,得到其保留时间规律;研究了不同脂肪酸的质谱断裂规律,选择3个特征离子来鉴定脂肪酸成分。建立了3个特征离子确定脂肪酸碳数及双键数目,色谱保留时间规律确定脂肪酸顺反异构体及双键位置异构体的方法。本法无需标准品即可快速测定脂肪酸同系物及异构体的含量,适用于脂肪酸组成的研究;及油脂、食品中脂肪酸,特别是反式脂肪酸的测定。     

食品中聚二甲基硅氧烷检测方法研究

建立了裂解气相色谱-质谱(PGC-MS)测定食品中聚二甲基硅氧烷残留量的方法。样品中的聚二甲基硅氧烷以石油醚-乙酸乙酯(5∶1,体积比)提取,通过硅胶小柱净化,经石油醚淋洗除去油脂后,用石油醚-乙酸乙酯(5∶1)洗脱。采用裂解气相色谱-质谱法将聚二甲基硅氧烷热裂解为小分子产物,测定裂解产物的组成,以相对分子质量相差74的系列甲基环硅氧烷作定性成分,以六甲基环三硅氧烷基为定量指标,以m/z207作定量离子,选择离子监测法(SIM)定量。方法的线性范围为10~500 mg/L,相关系数为0.995,加标回收率为91%~103%,相对标准偏差为7.1%~8.3%,定量下限(S/N=10)为5 mg/kg。方法适用于食品中微量聚二甲基硅氧烷的检测。     

超高效液相色谱法同时测定食品接触材料与食品模拟物中6种紫外吸收剂

建立了食品接触材料(聚氯乙烯和聚乙烯塑料)和食品模拟物中6种紫外吸收剂(UV-9、UV-326、UV-327、UV-329、UV-234和UV-1577)的超高效液相色谱测定方法.采用四氢呋喃溶解聚氯乙烯、热甲苯溶解聚乙烯材料以提取样品中的目标化合物;用凝胶渗透色谱法净化食品模拟物橄榄油样品;在ACQUITY UPLC...     

高效液相色谱-串联质谱法测定动物源性食品中20种磺酰脲类除草剂残留

建立了动物源性食品中20种磺酰脲类除草剂多残留的分析方法.样品经乙腈均质提取2次,经Waters Oasis HLB固相萃取小柱净化后,在高效液相色谱-电喷雾串联质谱仪多反应监测模式下测定,采用质谱法定性,外标法定量.除草剂采用Eclipse AAA色谱柱,以甲醇和0.1%乙酸溶液为流动相,在梯度洗脱条件下可以得到很好...