光谱学与光谱分析 |
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Raman Spectra and Structure Analysis of 2,6-Pyridine Dicarboxylic Acid in Different States and Single Bacillus Spore |
HUANG Rong-shao1, HUANG Xi1, 2, XU Lan-lan2, 3, LI Yong-qing4, HUANG Shu-shi2, 3* |
1. College of Agronomy, Guangxi University, Nanning 530004, China 2. Lab of Biophysics, Guangxi Academy of Sciences, Nanning 530003, China 3. Biotechnology Research Center, Kunming University of Science and Technology, Kunming 650224, China 4. Department of Physics, East Carolina University, Greenville, NC 27858-4353, USA |
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Abstract The Raman spectra of 2,6-pyridine dicarboxylic acid (DPA) and their calcium salts(Ca-DPA) in different states and the Ca-DPA in a single bacterial spore have been recorded by Laser Tweezers Raman system (LTRS) and the spectra have been assigned. Raman spectra of different states of DPA and Ca-DPA are different evidently. Analysis leading to differences in the structure of spectrum may be due to that the Raman spectra of DPA crystalline reflected more precise characteristics information compared to DPA powder, in which the laser can penetrate through DPA crystalline and the Raman scatter from the crystalline interior is greater than that from DPA powder. The second reason is that DPA powder and Ca-DPA crystalline contain water molecules, and the intermolecular hydrogen bonding in the crystals of these molecules is extensive. The presence of calcium ions would affect the pyridine ring so that both sides of the carboxyl pyridine ring have a certain geometric deformation and the hydroxy carboxylic was damaged. The DPA2-anion is principal in Ca-DPA and the DPA solution. The calcium ion affects the stability of the pyridine ring structure in the Ca-DPA solution. The result from the spectra also showed that the DPA in single spores present Ca-DPA crystal state.
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Received: 2010-05-10
Accepted: 2010-08-20
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Corresponding Authors:
HUANG Shu-shi
E-mail: hshushi@gxas.cn, hshushi@yahoo.com.cn
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