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3Â¥: Originally posted by lzjessie_wlf at 2012-12-21 23:56:09
The 46 difference from your single-charged compound  normally should come from the formic acid adduct  since formic acid (or TFA) is added for positive mode in ESI.

Only 22 differentiated from the ...

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yxh-5566: ½ð±Ò+1, ¡ï¡ï¡ïºÜÓаïÖú 2012-12-24 12:39:39
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yxh-5566: ½ð±Ò+1, ¡ï¡ï¡ïºÜÓаïÖú 2012-12-24 12:39:57
The 46 difference from your single-charged compound [M+H] normally should come from the formic acid adduct [M+H+HCOOH] since formic acid (or TFA) is added for positive mode in ESI.

Only 22 differentiated from the [M+H] peak if a sodium was added, and 44 differentiated from the [M+H] peak if two sodium were added for single charged peak.
  For double charged peak, the m/z for it should be [M+Na+Na]/2 since two positive charge have been attached.
the difference between isotope pattern should be 0.5 instead of 1 for single charged peak.
3Â¥2012-12-21 23:56:09
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yxh-5566: ½ð±Ò+1, ¡ï¡ï¡ïºÜÓаïÖú 2012-12-24 12:40:14
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