电感耦合等离子体发射光谱法测定食品中聚二甲基硅氧烷的含量

Determination of Dimethylpolysiloxanes in Foodstuffs by Inductively Coupled Plasma Atomic Emission Spectrometry

食品样品中的聚二甲基硅氧烷(PDMS)用航空煤油提取,经高速离心净化后,用电感耦合等离子体发射光谱法进行测定,外标法定量。当PDMS在鸡肉、牛肉、猪肉、黄瓜、菠萝样品中添加水平为5.0、10.0mg/kg和100.0mg/kg、在大豆油、花生油、棕榈油样品中添加水平为1.0、2.0mg/kg和10.0mg/kg、在裹粉炸粉样品中添加水平为2.5、5.0mg/kg和10.0mg/kg时,平均回收率为71.2%～122.9%,相对标准偏差小于15.0%,标准曲线在0.1～50.0mg/L之间,r≥0.995,针对动物肌肉和果蔬产品、食用油脂、裹粉的方法检出限分别为5.0、1.0、2.5mg/kg。本方法前处理操作简单,适用基质范围广,能够满足对食品中PDMS的检测要求,适合大量样品的快速、准确定性和定量分析。

An inductively coupled plasma atomic emission spectrometry （ICP-AES） method for the determination of dimethylpolysiloxanes （PDMS） in animal muscle, edible fat and oil, baking powder, and fruits and vegetables was developed. PDMS in samples were extracted with aviation kerosene, and the extract were then centrifuged and directly detected by ICP- AES. The average recovery rates of PDMS at the spiked levels of 5, 10, 100 mg/kg in the muscle of chicken, beef and pork, and in cucumber and pineapple; 1, 2, 10 mg/kg in soybean oil, peanut oil and palm oil, and 2.5, 5, 10 mg/kg in baking powder ranged from 71.2% to 122.9% with relative standard deviations （RSDs） less than 15%. The linearity of the developed method was in the range of 0.1 to 50 mg/L with correlation coefficients （r） of more than 0.995. The limits of detection were approximately 5.0 mg/kg for animal muscle, and fruits and vegetables, 1.0 mg/kg for edible fat and oil, and 2.5 mg/kg for baking powder. This simple, rapid and sensitive method allows for routine qualitative and quantitative analysis of PDMS in selected foodstuffs and can be used for the test of a large number of samples.