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The ionization source and polarity in MS analysis
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对质谱不懂 谁看一下啊 The ionization source and polarity in MS analysisionization source and polarity |
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slowstar
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zehuac(金币+1):谢谢参与啦 2010-07-10 08:40:47
zehuac(金币+1):谢谢参与啦 2010-07-10 08:40:47
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Specific analyte-solvent interactions, e.g., solubility effects, are most important in reversed-phase LC, because the interaction of the analyte with the bonded-phase material is a relatively weak, nonspecific Van der Waals interactions. The retention decreases with increasing polarity of the analyte. Mixtures of water or aqueous buffers and an organic modifier (methanol, acetonitrile, or tetrahydrofuran (THF)) are used as eluent. The percentage and type of organic modifier is the most important parameter in adjusting the retention of nonionic analytes. THF is generally not recommended for LC-MS applications, because of the possible formation of highly-reactive peroxide free radicals in the ion source. Because of the higher solvent strength and the lower viscosity in mixtures with water, acetonitrile is often preferred over methanol. |
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