不同颜色红薯和马铃薯的FTIR  

Investigation Different Colors of Sweet Potatoes and Potatoes by Fourier Transform Infrared Spectroscopy

作　　者：任静[1] 刘刚[1] 赵帅群 赵兴祥[1] 李伟星[1] 徐娟[1] 胡见飞 

机构地区：[1]云南师范大学物理与电子信息学院,昆明市呈贡区雨花片区1号650500

出　　处：《光谱实验室》2014年第5期569-573,共5页Chinese Journal of Spectroscopy Laboratory

基　　金：国家自然科学基金项目（10960179）资助.

摘　　要：利用傅里叶变换红外光谱研究了不同颜色红薯和马铃薯的红外光谱，结果显示，不同颜色红薯和马、铃薯的红外光谱整体相似，光谱主要由碳水化合物的振动吸收带组成。应用OMNIC8．0软件，做红薯、马铃薯淀粉与不同颜色红薯、马铃薯的红外光谱图相似性检索，检索结果表明红皮白心红薯、紫皮紫马铃薯中含有较多的淀粉．对红薯与马铃薯红外光谱进行二阶导数处理，发现其二阶导数光谱在1800—700cm^-1范围内差异明显，选取该区域的光谱进行相关分析，相关分析结果表明不同颜色红薯之间的相关系数大于0．875，不同颜色马铃薯之间的相关系数大于0．784。结果显示傅里叶变换红外光谱技术能够正确的鉴别区分不同颜色的红薯和马铃薯。Different colors of sweet potatoes and potatoes were studied by Fourier transform infrared （FTIR） spectroscopy, the results showed that the infrared spectra of different colors of sweet potatoes and potatoes were similar, and mainly made up of the absorption bands of the carbohydrates. The similarities of the samples were compared with sweet potato starches and potato starches, the results showed that the red skin white flesh sweet potatoes and red skin potatoes contained more starches. For the purpose of enhancing the spectra resolutions and amplifying the differences, the second-derivative spectra were selected for evaluation, the obvious differences of the evaluation were observed in the regions of 1800700cm^-1, which indicated that the varieties and compositions of chemical structure among the samples were different. Correlation analysis were performed on the second derivative infrared spectra in the range of 1800—700cm^-1, found that the correlation coefficient between different colors of sweet potatoes is greater than 0.875, and the correlation coefficient between different colors of potatoes is greater than 0.784. The results showed that the FTIR combined with correlation analysis can correctly distinguish different colors of sweet potatoes and potatoes.

关 键 词：红薯 马铃薯 傅里叶变换红外光谱 相关分析 

分 类 号：O657.33[理学—分析化学]