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yxh-5566銅蟲 (初入文壇)
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[求助]
液質(zhì)正模式分析一個(gè)化合物,分子量增加46 會是加了2個(gè)鈉嗎
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| 如題,一個(gè)分子上能加兩個(gè)鈉嗎 |
木蟲 (正式寫手)
金蟲 (小有名氣)
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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. |
鐵桿木蟲 (正式寫手)
銅蟲 (初入文壇)
銅蟲 (初入文壇)
銅蟲 (初入文壇)
金蟲 (正式寫手)
新蟲 (小有名氣)
新蟲 (小有名氣)
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