茶叶表面增强拉曼光谱的初步研究  

Preliminary Study on the Surface Enhanced Raman Spectrum of Tea

作　　者：陈永坚[1] 冯尚源[1] 郭小林[1] 席刚琴[1] 王静[1] 陈荣[1] 

机构地区：[1]福建师范大学,医学光电科学与技术教育部重点实验室,福建福州350007

出　　处：《光谱学与光谱分析》2012年第10期2702-2705,共4页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目(60778046,61178090,11104030,81101110);福建省科技厅项目(2005I0009,2012J05004);福建省教育厅项目(JA11055)资助

摘　　要：以铁观音为例,测试其表面增强拉曼(SERS)光谱,并从增强能力、背景噪声、光谱重复性和信噪比等方面,研究探讨铁观音茶叶SERS光谱测试时活性基底选择;不同吸附时间对光谱测试的影响。结果表明:以柠檬酸三钠还原硝酸银制得的银溶胶为活性基底的增强效果更好,吸附时间对于铁观音茶叶SERS光谱的测试没有直观的影响。SERS光谱的茶叶研究方法有可能为茶叶的判别和质量鉴定提供一种新的方法。In the present paper, taking Tiegunyin tea as an example, surface enhanced Ram.an scattering （SERS） spectrum of tea was obtained, the effects of different active substrates were explored from the aspects of enhanced factor, background noise, repeatability, and signal to noise ratio （SNR）, while the impact of adsorption time on the measurement was also discussed. The results show that it is feasible to obtain the SERS spectrum of tea, and Raman signal of SERS spectrum was greatly enhanced compared with that of regular Raman spectrum. The active substrate of silver colloid prepared by the reduction of silver nitrate and trisodium citrate has a better enhanced effect, while different adsorption times have no direct influences on the SERS measurement. The method based on SERS firstly proposed in this paper may provide an alternative method for the discriminant analysis and quality identification of tea.

关 键 词：表面增强拉曼光谱 茶叶 活性基底 吸附时间 

分 类 号：O657.3[理学—分析化学] S571.1[理学—化学]