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在室温、p H=7.4、10 mmol/L 4-羟乙基哌嗪乙磺酸(Hepes)缓冲溶液条件下,利用荧光光谱研究了卵清蛋白(Ova)与Tb~(3+)的结合性质.利用荧光探针2-对甲苯胺基-6-萘磺酸钠(TNS)检测了Tb~(3+)对Ova疏水区的影响.通过化学变性实验分析了Ca2+和Tb~(3+)对Ova结构稳定性的影响.结果表明,Ova可以与Tb~(3+)形成1∶2的复合物,Tb~(3+)的结合使其疏水区暴露程度增加,TNS的荧光增强.Ova的解折叠曲线呈现三态的变化(N■■I■■U).Ca2+可以增加I■■U过程的稳定性,Tb~(3+)对N■■I和I■■U两个解折叠过程都有影响. 相似文献
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探讨了水蒸气蒸馏法从肉桂皮中提取肉桂油的蒸馏时间、浸泡溶剂对提取效率的影响。得到最佳的提取条件:将肉桂皮粉用乙醇浸泡24h后进行水蒸气蒸馏1h。并利用官能团性质鉴定法和红外光谱法对肉桂油的主要成分进行了鉴定,发现肉桂油的主要成分是肉桂醛。 相似文献
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The probe of 8-(2-hydrazinobenzothiazole)-7-hydroxy-4-methylcoumarin(L) was synthesized, and its recognition of Cu2+ was studied by UV-Vis spectroscopy. The recognition mechanism was investigated by Job plot’s, infrared spectroscopy and mass spectrometry. The probe displayed a distinct color change from colorless to light yellow upon the addition of Cu2+ in dimethyl sulfoxide and water(V∶V=9∶1) solution. The absorbance of probe L had a good linear relationship with Cu2+ concentration in the range of 0.125-5 μmol/L, and the linear equation was A=0.037c+0.052, with the correlation coefficient (R2) of 0.9881, and the detection limit of 0.02 μmol/L. The probe can detect Cu2+ quantitatively in water with a high selectivity and sensitivity. © 2023, Youke Publishing Co.,Ltd. All rights reserved. 相似文献