中国医学科学院生物医学工程研究所激光医学实验室，天津 300192
细菌是人类最常见的致病源之一，不仅严重危害人类健康和公共卫生安全，还带来了巨额的医疗支出。快速而准确的细菌检测对细菌感染的治疗具有重要的意义。光谱检测方法不但可以快速实时地获得细菌的分类、含量以及功能状态等信息，而且具有操作简单、非侵入性的优势，在细菌检测领域具有巨大的潜力。本文介绍了拉曼光谱、太赫兹光谱、可见光和近红外光光谱、荧光光谱在细菌检测方面的研究与应用，并对可见光和近红外光光谱的分子机制——光靶点，包括含有视网膜发色团的细菌视紫红质（ CBCRs）、带有四吡咯发色团的拟菌植物色素、带有对香豆酸发色团的光活性黄蛋白（ PYP）、带有黄素单核苷酸（ FMN）的光氧压力（ LOV）结构域、带有黄素腺嘌呤二核苷酸（ FAD）发色团的隐色剂和含有 FAD的蓝光感应域等进行了阐述。最后，针对现有细菌光谱检测技术的优缺点提出了细菌检测技术的优化策略，希望对细菌的光谱检测研究提供帮助。
细菌感染 光谱检测 拉曼光谱 可见光和近红外光谱 光靶点 bacterial infection spectral detection Raman spectroscopy visible light and near-infrared spectroscopy optical target
Author Affiliations
Abstract
1 Institute of Biophotonics, National Yang-Ming University, 155, Linong St., Sec. 2, Taipei 112, China
2 Institute of Microbiology and Immunology, National Yang-Ming University, 155, Linong St., Sec. 2, Taipei 112, China
3 Department of Photonics, National Sun Yat-Sen University, 70 Lien Hai Road, Kaohsiung 804, China
Fluorescence lifetime imaging microscopy (FLIM) has gained popularity as a sensitive technique to monitor the functional/conformational states of reduced nicotinamide adenine dinucleotide (NADH), one of the main compounds of oxidative phosphorylation. In this letter, we apply the technique to characterize the metabolic changes in mouse embryonic fibroblast 3T3 cells upon bacterial infection. A gradual shortening of the decaying time constants in both the short and the long lifetime components of NADH’s autofluorescence is detected. The ratio of the short and the long lifetime components’ relative contributions, however, shows a rapid increase, indicating the rise of cellular metabolic activity over the course of infection.
细菌感染 NADH 荧光寿命成像 000.1430 Biology and medicine 000.4920 Other life sciences 110.1080 Active or adoptive optics 180.2520 Fluorescence microscopy 180.4315 Nonlinear microscopy 300.2530 Fluorescence, laser-induced Chinese Optics Letters
2010, 8(10): 931
