纱布吸附-紫外灯照射法测定食品接触纸及其制品中荧光增白剂

目的建立食品接触纸中荧光增白剂国家标准检测方法。方法当样品有不太明显的蓝色或紫色荧光时,样品中的荧光增白剂用碱性提取溶剂提取,调节提取液为酸性,纱布吸附,在波长365 nm紫外灯照射下测定纱布的荧光强度。结果紫外灯照射法能定性判定样品中高含量的荧光增白剂。纱布吸附结合紫外灯照射法能定性判定样品中低含量的荧光增白剂,排除样品荧光本底或者其他荧光污染物的干扰,荧光增白剂的检出限为10 mg/kg。结论该法适合定性测定食品接触纸中荧光增白剂,操作简单,结果可靠。

Determination of fluorescent whitening agents in food contact paper by UV irradiation method combined with gauze absorption

To develop a national standard method for rapid determination of fluorescent whitening agents (FWAs) in food contact papers.Methods When the sample didn''t obvious blue or purple fluorescence, FWAs in the sample were extracted by an alkaline solution, the extract was adjusted to acidic and absorbed by gauze,and the fluorescent intensity of the gauze was tested by UV light with the wavelength at 365 nm. Results UV irradiation method could qualitatively determination the high level of FWAs in the sample. UV irradiation method combined with gauze absorption could qualitatively determination the low level of FWAs in the sample and exclude the interference from the natural fluorescent background and other fluorescent pollutants, the limit of detection of FWAs was 10 mg/kg.Conclusion This method was simple, reliable, and suitable for the qualitative determination of FWAs in food contact papers.