论文部分内容阅读
基于表面增强拉曼光谱(SERS)的指纹图谱的高能量分辨率,以位于~630 cm~(-1)亚硫酸根的特征峰为定性和定量依据,本文开展了食品中滥用和非法添加二氧化硫的直接检测研究:一种检测流程实现了不同食品基质中二氧化硫的高灵敏检测,最低检出浓度达1 mgkg~(-1)的水平.针对实际样本的传统蒸馏法前处理流程的一些不足以及SERS检测的指纹图谱优势,本文进行了三方面显著改进:(1)碳酸钙和沸石取代氮气以提高二氧化硫的挥发提取效率;(2)草酸取代盐酸酸化蒸馏溶液,以有效避免挥发性强酸对操作环境的危害;(3)氢氧化钠溶液代替乙酸铅溶液作为吸收液,以防止二次污染.环境友好、灵敏度高和不受基质干扰等特点使得本方法有望取代经典蒸馏法和比色法,用于食品中非法添加二氧化硫类添加剂的快速高效筛查.
Based on the high energy resolution of the surface enhanced Raman spectroscopy (SERS) fingerprints and based on the qualitative and quantitative evidence of the sulfite peak located at ~ 630 cm -1, this paper carried out the study on the abuse and illegal addition of sulfur dioxide Direct detection study: A detection procedure to achieve a highly sensitive detection of sulfur dioxide in different food matrices, the lowest detectable concentration of 1 mgkg ~ (-1) level for the actual sample of some of the traditional distillation process pre-treatment deficiencies and SERS detection fingerprint of the advantages of this article were significantly improved in three areas: (1) calcium carbonate and zeolite to replace nitrogen to improve the volatile extraction efficiency of sulfur dioxide; (2) oxalic acid instead of hydrochloric acid acidification distillation solution to effectively avoid the volatile acid on the operation Environmental harm; (3) sodium hydroxide solution instead of lead acetate solution as an absorbent to prevent secondary pollution. Environmentally friendly, high sensitivity and free from matrix interference and other characteristics make this method is expected to replace the classic distillation and colorimetry, It is used for rapid and efficient screening of illegally added sulfur dioxide additives in foods.