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[½»Á÷] The ionization source and polarity in MS analysis

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The ionization source and polarity in MS analysisionization source and polarity

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rain841230

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wypward:лл²ÎÓë 2010-06-22 21:33:01
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likeСľ

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Originally posted by rain841230 at 2010-06-22 21:30:21:
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The ionization source and polarity in MS analysis can also influence metabolite coverage.
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zerohead

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wypward:лл²ÎÓë 2010-06-23 15:20:23
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rain841230

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Originally posted by zerohead at 2010-06-22 18:19:56:
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rain841230

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zehuac:¶àл²ÎÓë 2010-06-23 13:45:26
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Originally posted by likeСľ at 2010-06-22 16:11:01:



The ionization source and polarity in MS analysis can also influence metabolite coverage.
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zehuac:¶àл²ÎÓë 2010-06-23 13:45:09
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polarity¾ÍÊÇ ¼«ÐÔ£¬ÑùÆ·ÔÚµç×Óºä»÷Àë×ÓÔ´£¨electron impact sourse,EI£©ÀïÀë×Ó»¯ºóµÄË鯬Àë×ÓÊǸù¾ÝºÉÖʱȣ¨e/m£¬¶ÔÓ¦ÓÚ¼«ÐÔ£©µÄ´óСÒÀ´Î·É³öÀë×ÓÔ´£¬¾­³ö¿ÚÏÁ·ì½øÈë·ÖÎöÆ÷¡£
1.The columns are listed in order of increasing polarity
2.The eluents are listed in order of increasing polarity
3.elective elution can be carried out by mixing two or more solvents to achieve different degrees of polarity
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zehuac(½ð±Ò+1):лл²ÎÓëÀ² 2010-07-10 08:40:47
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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jingjing1005

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likeСľ(½ð±Ò+2, ·­ÒëEPI+1): 2010-06-23 14:46:31
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