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. Author manuscript; available in PMC: 2012 Dec 1.
Published in final edited form as: Int J Mass Spectrom. 2011 Aug 10;308(2-3):357–361. doi: 10.1016/j.ijms.2011.08.006

Table 1.

The accurate atomic masses and corresponding mass defects for five elements found in amino acids [34]. Note the large negative mass defect for 31P.

Elements Accurate Mass (Da) Mass Defect (Da)
1H 1.007825032 + 0.007825032
12C 12.000000000 + 0.000000000
14N 14.003074005 + 0.003074005
16O 15.994914622 − 0.005085378
31P 30.973761487 − 0.026238513
32S 31.972070690 − 0.027929310