一种便携式快速等离激元增强拉曼光谱检测前处理仪的研制与在食品安全中的应用

发布时间：2018-05-05 17:58

本文选题：样品前处理 + 等离激元增强拉曼光谱　；参考：《光谱学与光谱分析》2015年04期

【摘要】：便携式拉曼光谱仪在现场快速分析中往往由于现场样品比较复杂,需要处理后才能采用光谱仪进行测定,因此一定程度上限制它的使用。常规实验室前处理虽然行之有效,但是过程繁琐费时,不适合现场使用。本课题组开发了一种便携式快速PERS前处理仪器,具有便携、功耗低、操作简便,提取时间短以及重复性好等特点,能满足现场快速检测的前处理需求。该仪器由超声波提取单元、加热抽气挥发单元、尾气净化与吸收单元以及控制系统四个功能模块组成,并且设有LED控制面板和报警装置。整个工作流程主要包括超声提取、液液萃取和溶剂加热抽气挥发三个环节。以三种实际样品(辣椒粉、辣椒油、豆瓣酱)中的违禁添加剂罗丹明B检测为例,结果表明:与常规实验室前处理方法相比,两种前处理方法对于PERS谱图影响不大,但是检测时间缩短一半。另外,重复性实验检测结果的相对标准偏差(relative standard deviation,RSD)小于±5%。
[Abstract]:In the field rapid analysis, the portable Raman spectrometer is limited to a certain extent because of the complexity of the field samples and the need to be processed before the spectrometer can be used for the determination. Although the routine laboratory pretreatment is effective, the process is cumbersome and time consuming, so it is not suitable for field use. A portable and fast PERS pre-processing instrument has been developed, which has the advantages of portable, low power consumption, simple operation, short extraction time and good repeatability. The instrument is composed of four functional modules: ultrasonic extraction unit, heating and pumping unit, tail gas purification and absorption unit and control system, and is equipped with LED control panel and alarm device. The whole work flow mainly includes ultrasonic extraction, liquid-liquid extraction and solvent-heated extraction. The detection of the prohibited additive Rhodamine B in three real samples (chili powder, chili oil, bean paste) was taken as an example. The results showed that the two pretreatment methods had little effect on the PERS spectra compared with the conventional laboratory pretreatment methods. But the test time was halved. In addition, the relative standard deviation (RSD) of reproducible test results was less than 卤5%.
【作者单位】：厦门大学物理与机电工程学院;厦门大学化学化工学院;
【基金】：国家重大科学仪器设备开发专项项目(2011YQ03012417)资助
【分类号】：TH744.1;TS201.6

【参考文献】