Chen Yong-Jian, Feng Shang-Yuan, Guo Xiao-Lin, Xi Gang-Qin, Wang Jing, Chen Rong
Key Laboratory of Optoelectronic Science and Technology for Medicine, Ministry of Education, Fujian Normal University, Fuzhou 350007, China.
Guang Pu Xue Yu Guang Pu Fen Xi. 2012 Oct;32(10):2702-5.
In the present paper, taking Tiegunyin tea as an example, surface enhanced Raman 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.
本文以铁观音茶为例，获得了茶叶的表面增强拉曼散射（SERS）光谱，从增强因子、背景噪声、重复性和信噪比（SNR）等方面探讨了不同活性基底的影响，同时还讨论了吸附时间对测量的影响。结果表明，获得茶叶的SERS光谱是可行的，与常规拉曼光谱相比，SERS光谱的拉曼信号得到了极大增强。由硝酸银和柠檬酸三钠还原制备的银胶体活性基底具有较好的增强效果，而不同的吸附时间对SERS测量没有直接影响。本文首次提出的基于SERS的方法可为茶叶的判别分析和质量鉴定提供一种替代方法。
