| 光谱学与光谱分析 |
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| Probing the Machanism and Ca-DPA Concentration of Individual Bacillus Spores Using Trapping and Raman Spectroscopy |
| HUANG Xi1,2, HUANG Rong-shao1, LAI Jun-zhuo2,3, XU Lan-lan2,4, LI Yong-qing5, LI Zhen-chong2, HUANG Shu-shi2,4* |
1. College of Agronomy, Guangxi University, Nanning 530003, China
2. Lab of Biophysics, Guangxi Academy of Sciences, Nanning 530003, China
3. College of Life Science and Technology, Guangxi University, Nanning 530003, China
4. Biotechnology Research Center, Kunming University of Science and Technology, Kunming 650224, China
5. Department of Physics, East Carolina University, Greenville, NC 27858-4353, USA |
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Abstract Measuring the levels of 2,6-pyridine dicarboxylic acid (DPA) in bacteria spores could provide the information about the DPA function, resistance mechanism and the mechanism of spore germination. The authors have measured levels of Ca-DPA of individual spores of different 19 kinds of Bacillus which from different sources, species, and strains by using laser tweezers Raman spectroscopy (LTRS). Also we have verified the reproducibility of the system simultaneously. To investigate the biochemical components and structure in single spore, a Raman tweezers setup was used to record the Raman spectrum of single spore. A NIR laser beam (30 mW, 785 nm) was introduced into an inverted microscope to form a tweezers for trapping the spore suspended in water, and the Raman scatter was excited by the same beam. Raman spectra of 30 spores of 19 bacilus strains which collected from different area in China were recorded, and 100 spores of B. subtilis ACCC10243 were measured. A spore of the same strain was probed 100 times for verifying the reproducibility of the LTRS system. A Matlab 7.0 edited program and Origin 8.0 were used to process the spectral data. Because Ca-DPA is the chelate of DPA and the calcium ion, and the strongest Raman bands at 1 017 cm-1 was from Ca-DPA component of the spore, its intensity was linearly with the Ca-DPA concentration. Therefore, the 1 017 cm-1 bands of Ca-DPA could be used as the quantitative standard peak, and then calculated the concentration of Ca-DPA could be calculated according the intensity of 1 017 cm-1 peak. The results showed that Raman spectra of single spore can reflect the characteristics information of it. The diversity of Ca-DPA levels not only happened between different species and strains of bacillus, but also happened between different individual spores in the same strains of bacillus. Conclusion from these measurements is that there is heterogeneity in different individual spores. It is convenient to trapping and collecting its Raman spectrum in water directly, and then get the information of the level of DPA, without the complex preparation of separating, purifying spores and abstracting DPA, so we predict LTRS as a high sensitivity, high accuracy, rapid and effective method in the research of individual spores.
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Received: 2009-09-26
Accepted: 2009-12-28
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Corresponding Authors:
HUANG Shu-shi
E-mail: hshushi@gxas.cn;hshushi@yahoo.com.cn
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