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通过观察酸度对模拟转铁蛋白小分子EHPG和HBED紫外差光谱的影响,结合脱铁伴清蛋白与金属离子、阴离子结合的光谱特性,推断脱铁伴清蛋白与金属离子的结合导致金属离子结合位点处酪氨酸酚羟基的去质子化,而与阴离子的结合导致阴离子结合位点处酪氨酸酚羟基的质子化. 相似文献
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The interaction of gallium(Ⅲ) with the ligands containing phenolic group(s), such as salicylic acid, 8-hydroxyquinoline, N,N'-bis(2-hydroxybenzyl)ethylenediamine-N,N'diacetic acid (HBED), N,N'-ethylenebis[2-(o- hydroxyphenyl)glycine (EHPG), and ovotransferrin, was studied, respectively, by means of fluorescence in 0.01 mol/L Hepes at pH 7.4 and room temperature. Fluorescence intensity showed an increase when gallium(Ⅲ) was bound to 8-hydroxyquinoline and HBED. In contrast, it was decreased with the interaction of gallium(Ⅲ) with salicylic acid and EHPG. At pH 7.4, there was N…H-O type intramolecular hydrogen bond in the former, and the latter existed O…H-O type intramolecular hydrogen bond. Fluorescence titration of apoovotransferrin with gallium(Ⅲ) displayed that the fluorescence intensity was decreased at the N-terminal binding site, while enhanced at the C-terminal binding site. It can account for the O…H-O type intramolecular hydrogen bonds for the phenolic groups of Tyr92 and Tyr191 residues at the N-terminal binding site. And there are N…H-O type intramolecular hydrogen bonds for Tyr431 and Tyr524 residues at the C-terminal binding site. In addition, under the same conditions, the conditional binding constant of gallium(Ⅲ) with EHPG or HBED determined by fluorescence method is lg KGa-EHPG=19.18 or lg KGa-HBED= 19.08. 相似文献
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CoV2O6纳米线/微米棒的制备及其在锂离子电池中的应用 总被引:1,自引:0,他引:1
采用水热法制备了纳米线/微米棒结构的CoV2O6电极材料,并探讨了纳米线/微米棒的形成机理.通过XRD、BET、SEM、TEM/HRTEM等测试手段对合成产物的结构、形貌、组成、表面性质进行了表征,结果表明,水热条件例如反应温度、反应时间对于产物的结构和形貌起关键作用.在220℃,水热反应1h可以得到直径为60nm的CoV2O6纳米线,而在220℃,水热反应6h可以得到直径10μm的CoV2O6微米棒.研究了CoV2O6纳米线/微米棒作为锂离子电池负极材料的电化学性能,结果显示,与CoV2O6微米棒相比,CoV2O6纳米线具有高的初始放电容量(1235mAh/g)和较好的循环稳定性,CoV2O6纳米线有希望作为锂离子电池的负极材料. 相似文献
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