便携式激光拉曼光谱法快速鉴别橄榄油掺假

Rapid detection of adulterated olive oil by portable laser Raman spectroscopy

中文关键词:  激光拉曼光谱法  橄榄油  掺假鉴别  无损分析

英文关键词:portable laser Raman spectrometry  olive oil  adulteration determination  nondestructive analysis

中文摘要:

      目的 采用便携式激光拉曼光谱仪, 建立激光拉曼光谱对橄榄油进行快速鉴别的方法。方法 对橄榄油样品进行光谱扫描及基线校正后, 以1440 cm-1作为参考波数, 对拉曼光谱数据进行归一化处理。结果 对80余份橄榄油样品进行统计分析, 发现75%的样品在1265 cm-1的拉曼光谱强度值低于540。特级初榨橄榄油中掺加果渣油, 会使1265 cm-1和1650 cm-1的特征峰增强, 1525 cm-1处的精细结构变小直至消失。结论 拉曼光谱具有便捷、快速、无损分析的特点, 可作为橄榄油真伪鉴别在线初步筛查的工具。

英文摘要:

      Objective To establish a rapid method for the determination of adulterated olive oil by Raman spectroscopy using portable laser Raman spectrometry. Methods The Raman spectrum of olive oil samples were obtained after baseline subtracting. The peak at 1440 cm-1 was exploited as an internal standard band, and the spectrum was normalized. Results By the statistical analysis of more than 80 olive oil samples, 75% of the samples were lower than 540 at 1265 cm-1. When the olive-pomace oil was added to virgin olive oil, the intensity of peaks at 1265 cm-1 and 1650 cm-1 increased, meanwhile the peak at 1525 cm-1 disappeared. Conclusion The Raman spectrometry is portable, rapid, and nondestructive, which can be used as an on-site detection tool for olive oil adulteration determination.