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. 2009 Dec 28;1(3):204–214. doi: 10.1021/cn900028s

Figure 2.

Figure 2

MALDI-TOF/TOF mass spectrum of isotopic formaldehyde labeled mixture of brain extracts. Two aliquots of C18 ziptip processed brain extract of the same volume are labeled with formaldehyde or deuterium formaldehyde in the same way and mixed in a ratio of 1:1. The D2-formaldehyde (FD2) labeled peaks are indicated with open circles, and the H2-formaldehyde (FH2) labeled peaks are indicated with closed circles. There are 4 Da mass differences for each incorporated label.