Production of a fluorescence probe in ion-beam radiolysis of aqueous coumarin-3-carboxylic acid solution-1: Beam quality and concentration dependences
Production of a fluorescence probe in ion-beam radiolysis of aqueous coumarin-3-carboxylic acid solution-1: Beam quality and concentration dependences
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DOI：
10.1016/j.radphyschem.2010.11.013
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发表时间：
2011-04-01
影响因子：
2.9
通讯作者：
Katsumura, Yosuke
中科院分区：
文献类型：
--
作者：
Maeyama, Takuya;Yamashita, Shinichi;Katsumura, Yosuke
香豆素-3-羧酸（3-CCA）水溶液用七种不同的离子束辐照，LET范围从0.5到2000 eV/nm以上。用荧光高效液相色谱法测定了溶液辐解中羟基化产物70 H-CCA在0.1 ~ 26 mM浓度范围内的G值，发现70 H-CCA的生成率随3-CCA浓度的增加而增加，随离子束LET值的增加而降低。与我们以前报道的G（（OH）-O-center dot）在10（7）s（-1）的清除能力的吸收光谱相比，发现G（7 OH-CCA）约为G（（OH）-O-center dot）的（4.7 +/-0.6）%，这与本研究中使用的所有离子束一致。然而，在高3-CCA浓度区域，特别是通过使用极高的LET离子，7 OH-CCA产率远高于基于上述转换因子和G（OH）值在理论工作中预测的预期值。(C)2010爱思唯尔有限公司版权所有。
Aqueous coumarin-3-carboxylic acid (3-CCA) solutions were irradiated with seven different ion beams covering LET range from 0.5 to above 2000 eV/nm. G-values of 70H-CCA, one of hydroxylated products in radiolysis of the solutions, have been determined by fluorescence-HPLC technique in 3-CCA concentration range from 0.1 to 26 mM. The formation yield of 70H-CCA increased with increase in concentration of 3-CCA while it decreased with increase in LET value of ion beam. Compared with our previous reports on G((OH)-O-center dot) at a scavenging capacity of 10(7) s(-1) with absorption spectroscopy, it was found that G(7OH-CCA) is about (4.7 +/- 0.6)% of G((OH)-O-center dot), which is consistent for all of the ion beams used in the present study. However, 7OH-CCA yields in high 3-CCA concentration region, especially by using extremely high LET ions, were much higher than expected values based on the above conversion factor and G(OH) value predicted in theoretical work. (C) 2010 Elsevier Ltd. All rights reserved.