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首页> 外文期刊>European journal of mass spectrometry >Determination of dissociation constants of cyclodextrin-ligand inclusion complexes by electrospray ionization mass spectrometry
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Determination of dissociation constants of cyclodextrin-ligand inclusion complexes by electrospray ionization mass spectrometry

机译：电喷雾电离质谱法测定环糊精-配体包合物的解离常数

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摘要

The inclusion complexes of four ligands binding to cyclodextrins (CDs) were studied by electrospray ionization mass spectrometry (ESI-MS) and the dissociation constants of the complexes were obtained. The 1 : 1 stoichiometric inclusion complex was found in the system of CD and fenbufen or aspirin. The obtained KD values of the inclusion complexes of fenbufen binding to α-CD and to β-CD are 4.38 × 10–4 mol L–1 and 2.12 × 10–4 mol L–1, respectively. The KD values of the inclusion complexes of α-CD-aspirin and β-CD-aspirin are 3.33 × 10–4 mol L–1 and 1.83 × 10–4 mol L–1, respectively. A non-linear least squares regression method was applied to validate the results which were consistent with each other. For the system of tetracycline hydrochloride and CD, the 1 : 1 and 1 : 2 stoichiometric inclusion complexes were found in the mass spectra. The KD,1 and KD,2 values of the 1 : 1 and 1 : 2 stoichiometric inclusion complexes of α-CD and tetracycline hydrochloride are 4.47 × 10–4 mol L–1 and 6.51 × 10–4 mol L–1, respectively, and those of β-CD and tetracycline hydrochloride are 2.26 × 10–4 mol L–1 and 8.57 × 10–4 mol L–1, respectively. For the system of norfloxacin and CD, besides the 1 : 1 and 1 : 2 inclusion complexes, the 1 : 3 stoichiometric inclusion complex was also found. The KD,1, KD,2 and KD,3 of α-CD and norfloxacin inclusion complexes are 4.61 × 10–4 mol L–1, 6.05 × 10–4 mol L–1 and 1.45 × 10–3 mol L–1, respectively. The three KD values of β-CD and norfloxacin are 1.96 × 10–4 mol L–1, 4.93 × 10–4 mol L–1 and 1.15 × 10–3 mol L–1, respectively
机译：通过电喷雾电离质谱（ESI-MS）研究了四种与环糊精（CDs）结合的配体的包合物，并求得了该化合物的解离常数。在CD和芬布芬或阿司匹林的系统中发现了化学计量的1：1包合物。获得的芬布芬与α-CD和β-CD结合的包合物的KD值分别为4.38×10-4 mol L-1和2.12×10-4 mol L-1。 α-CD-阿司匹林和β-CD-阿司匹林的包合物的KD值分别为3.33×10–4 mol L-1和1.83×10–4 mol L-1。应用非线性最小二乘回归法验证了彼此一致的结果。对于四环素盐酸盐和CD的系统，在质谱图中发现了1：1和1：2化学计量的包合物。 α-CD和四环素盐酸盐的1：1和1：2化学计量夹杂物的KD，1和KD，2值分别为4.47×10–4 mol L–1和6.51×10–4 mol L–1 ，β-CD和四环素盐酸盐的分别为2.26×10–4 mol L-1和8.57×10–4 mol L-1。对于诺氟沙星和CD的系统，除了1：1和1：2的包合物外，还发现了1：3的化学计量包合物。 α-CD和诺氟沙星包合物的KD，1，KD，2和KD，3为4.61×10–4 mol L–1、6.05×10–4 mol L–1和1.45×10–3 mol L–1 ， 分别。 β-CD和诺氟沙星的三个KD值分别为1.96×10–4 mol L-1、4.93×10–4 mol L-1和1.15×10–3 mol L-1。

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