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. Author manuscript; available in PMC: 2019 May 1.
Published in final edited form as: Anal Bioanal Chem. 2018 Mar 19;410(12):2879–2887. doi: 10.1007/s00216-018-0982-1

Table 3.

Average Molecular Masses of Bases and Base Pairs a,b

Base d Formula Nucleotide Monomer
Polynucleotide Polymer c
Acid e Base−2 f Acid e Base−1 f Na+ Salt
A C10H14O6N5P 331.222(1) 329.206(1) 313.207(1) 312.199(1) 334.181(1)
T C10H15O8N2P 322.208(1) 320.192(1) 304.193(1) 303.185(1) 325.167(1)
G C10H14O7N5P 347.221(1) 345.206(1) 329.206(1) 328.198(1) 350.180(1)
C C9H14O7N3P 307.197(1) 305.181(1) 289.182(1) 288.174(1) 310.156(1)
Mean 326.962(2) 324.946(2) 308.947(2) 307.939(2) 329.921(2)
30:30:20:20 Mean h 326.913(2) 324.897(2) 308.898(2) 307.890(2) 329.872(2)
AT g C20H29O14N7P2 653.430(2) 649.398(2) 617.400(2) 615.384(2) 659.347(2)
GC g C19H28O14N8P2 654.419(2) 650.387(2) 618.388(2) 616.372(2) 660.336(2)
Mean 653.925(3) 649.893(3) 617.894(3) 615.878(3) 659.842(3)
60:40 Mean i 653.826(3) 649.794(3) 617.795(3) 615.779(3) 659.743(3)
a

Ignoring end-groups and methylation

b

Molar masses are calculated from the atomic masses, uncertainties, and ranges listed in (Meija et al., 2016) [27]. Standard uncertainties, estimated following (Possolo et al., 2017) [28], are enclosed by parentheses

c

Condensation polymer; n-1 waters are lost for every n condensed monomers

d

A: deoxyadenosine monophosphate, T: deoxythymidine monophosphate, G: deoxyguanosine monophosphate, C: deoxycytidine monophosphate

e

Conjugate acid, phosphate oxygens fully protonated

f

Conjugate base, phosphate oxygens fully deprotonated

g

Base pairs (bp) associated via hydrogen bonding

h

Calculated as (30A + 30 T + 20G + 20C)/100

i

Calculated as (60AT + 40GC)/100