Wm. Craig Byrdwell, phd

Taking Lipid Analysis into the 21st Century

For a conveniently printable two-page .pdf version of this mass list, click HERE

c = cis double bond, t = trans d.b., n– refers to the first double bond position, from the end of the fatty acid chain.

The above list includes the most common fatty acids and miscellaneous others.

· A more complete list of fatty acids, according to their trivial names, may be found at :

· https://www.aocs.org/Documents/Membership/Divisions/Comman_Names_FattyAcids.pdf

· Also see a full list of saturated fatty acid names on Wikipedia:

http://en.wikipedia.org/wiki/List_of_saturated_fatty_acids

Calculated monoisotopic masses of Fatty Acids and Triacylglycerols and their adducts and fragments are based on the following atomic isotope masses:

 

1H = 1.0078250321

12C = 12.000000

14N = 14.0030740052

16O = 15.9949146221

23Na = 22.98976967

31P = 30.97376151

 

These masses are the most recent suggested isotopic masses from the National Institute of Standards and Technology (NIST) at:

 

Physics.NIST.gov/

PhysRefData/Compositions/

© 2005-2018

The figures and tables on this website are copyrighted in 2005-2018 by William Craig Byrdwell and Byrdwell.com.  Please reference

 

Triacylglycerols.com

© 2005-2018

The figures and tables on this website are copyrighted in 2005-2018 by William Craig Byrdwell and Byrdwell.com.  Please reference

 

Triacylglycerols.com

Fatty Acids and Related Masses

For HRAM MS, Masses of ions now include loss or gain of a mole of electrons per mole of ions for  = -/+ 0.00054486 g/mol

 

Fatty Acid

 

 

 

 

 

Pure

Pure

Pure

Pure

Systematic Fatty Acid Name

Common Fatty Acid Name

Abbrev.

 

Fatty Acid Mass

 Methyl Ester

[RCOO+58]+

[RCOO+58-H2O]+

[RCO]+

[RCO-H2O]+

[RCOO]

Triglyceride

Triglyceride

Diglyceride

Diglyceride

 

 

 

C

 

U

ECN

 

 

=[RCO+74]+

=[RCO+74-H2O]+

 

 

(– mode)

 

Nominal

 

Nominal

Butanoic acid

Butyric acid

Bu

4

:

0

4

88.0524

102.0681

145.0859

127.0748

71.0491

53.0380

87.0452

302.1729

302

215.1283

215

Pentanoic acid

Valeric acid

V

5

:

0

5

102.0681

116.0837

159.1021

141.0916

85.0653

67.0548

101.0603

344.2199

344

243.1596

243

Hexanoic acid

Caproic acid

Co

6

:

0

6

116.0837

130.0994

173.1178

155.1072

99.0810

81.0704

115.0759

386.2668

386

271.1909

271

Heptanoic acid

Enanthic acid

En

7

:

0

7

130.0994

144.1150

187.1334

169.1229

113.0966

95.0861

129.0916

428.3138

428

299.2222

299

Octanoic acid

Caprylic acid

Cy

8

:

0

8

144.1150

158.1307

201.1491

183.1385

127.1123

109.1017

143.1072

470.3607

470

327.2535

327

Nonanoic acid

Pelargonic acid

 

9

:

0

9

158.1307

172.1463

215.1647

197.1542

141.1279

123.1174

157.1229

512.4077

512

355.2848

355

Decanoic acid

Capric acid

Ca

10

:

0

10

172.1463

186.1620

229.1804

211.1698

155.1436

137.1330

171.1385

554.4546

554

383.3161

383

Hendecanoic acid

Undecylic acid

 

11

:

0

11

186.1620

200.1776

243.1960

225.1855

169.1592

151.1487

185.1542

596.5016

596

411.3474

411

Dodecanoic acid

Lauric acid

La

12

:

0

12

200.1776

214.1933

257.2117

239.2011

183.1749

165.1643

199.1698

638.5485

638

439.3787

439

Tridecanoic acid

Tridecylic acid

 

13

:

0

13

214.1933

228.2089

271.2273

253.2168

197.1905

179.1800

213.1855

680.5955

680

467.4100

467

Tetradecanoic acid

Myristic acid

M

14

:

0

14

228.2089

242.2246

285.2430

267.2324

211.2062

193.1956

227.2011

722.6424

722

495.4413

495

Pentadecanoic acid

Pentadecylic acid

 

15

:

0

15

242.2246

256.2402

299.2586

281.2481

225.2218

207.2113

241.2168

764.6894

764

523.4726

523

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Hexadecanoic acid

Palmitic acid

P

16

:

0

16

256.2402

270.2559

313.2743

295.2637

239.2375

221.2269

255.2324

806.7363

806

551.5039

551

c-9-Hexadecenoic acid

Palmitoleic acid (n-7)

Po

16

:

1

14

254.2246

268.2402

311.2586

293.2481

237.2218

219.2113

253.2168

800.6894

800

547.4726

547

t-9-Hexadecenoic acid

Palmitelaidic acid (n-7)

Pe

16

:

1

14

254.2246

268.2402

311.2586

293.2481

237.2218

219.2113

253.2168

800.6894

800

547.4726

547

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Heptadecanoic acid

Margaric acid

 

17

:

0

17

270.2559

284.2715

327.2899

309.2794

253.2531

235.2426

269.2481

848.7833

848

579.5352

579

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Octadecanoic acid

Stearic acid

S

18

:

0

18

284.2715

298.2872

341.3056

323.2950

267.2688

249.2582

283.2637

890.8302

890

607.5665

607

c-9-Octadecenoic acid

Oleic acid (n-9)

O

18

:

1

16

282.2559

296.2715

339.2899

321.2794

265.2531

247.2426

281.2481

884.7833

884

603.5352

603

t-9-Octadecenoic acid

Elaidic acid (n-9)

El

18

:

1

16

282.2559

296.2715

339.2899

321.2794

265.2531

247.2426

281.2481

884.7833

884

603.5352

603

c-9,12-Octadecadienoic acid

Linoleic acid (w-6)

L

18

:

2

14

280.2402

294.2559

337.2743

319.2637

263.2375

245.2269

279.2324

878.7363

878

599.5039

599

c-9,12,15-Octadecatrienoic acid

a-Linolenic acid (w-3)

Ln

18

:

3

12

278.2246

292.2402

335.2586

317.2481

261.2218

243.2113

277.2168

872.6894

872

595.4726

595

c-6,9,12-Octadecatrienoic acid

g-Linolenic acid (w-6)  =  GLA

g-Ln

18

:

3

12

278.2246

292.2402

335.2586

317.2481

261.2218

243.2113

277.2168

872.6894

872

595.4726

595

9c,11t,13t-Octadecatrienoic  acid

a-Eleostearic acid

Eo

18

:

3

12

278.2246

292.2402

335.2586

317.2481

261.2218

243.2113

277.2168

872.6894

872

595.4726

595

9t,11t,13t-Octadecatrienoic  acid

b-Eleostearic acid

 

18

:

3

12

278.2246

292.2402

335.2586

317.2481

261.2218

243.2113

277.2168

872.6894

872

595.4726

595

8c,10t,12c-Octadecatrienoic  acid

Jacaric acid

Ja

18

:

3

12

278.2246

292.2402

335.2586

317.2481

261.2218

243.2113

277.2168

872.6894

872

595.4726

595

9t,11t,13c-Octadecatrienoic  acid

Catalpic acid

Ct

18

:

3

12

278.2246

292.2402

335.2586

317.2481

261.2218

243.2113

277.2168

872.6894

872

595.4726

595

c-6,9,12,15-Octadecatetraenoic acid

Stearidonic acid (w-3)

St

18

:

4

10

276.2089

290.2246

333.2430

315.2324

259.2062

241.1956

275.2011

866.6424

866

591.4413

591

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Nonadecanoic acid

Nonadecylic acid

 

19

:

0

19

298.2872

312.3028

355.3212

337.3107

281.2844

263.2739

297.2794

932.8772

932

635.5978

635

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Eicosanoic acid

Arachidic acid

A

20

:

0

20

312.3028

326.3185

369.3369

351.3263

295.3001

277.2895

311.2950

974.9241

974

663.6291

663

c-9-Eicosenoic acid

Gadoleic acid (n-11)

G

20

:

1

18

310.2872

324.3028

367.3212

349.3107

293.2844

275.2739

309.2794

968.8772

968

659.5978

659

c-11-Eicosenoic acid

Gondoic acid (n-9)

Go

20

:

1

18

310.2872

324.3028

367.3212

349.3107

293.2844

275.2739

309.2794

968.8772

968

659.5978

659

c-11,14-Eicosadienoic acid

DihomoLinoleic acid (w-6)

C20:2

20

:

2

16

308.2715

322.2872

365.3056

347.2950

291.2688

273.2582

307.2637

962.8302

962

655.5665

655

c-11,14,17-Eicosatrienoic acid

Bis-homo-a-Linolenic acid (w-3), ETA

C20:3

20

:

3

14

306.2559

320.2715

363.2899

345.2794

289.2531

271.2426

305.2481

956.7833

956

651.5352

651

c-8,11,14-Eicosatrienoic acid

Bis-homo-g-Linolenic acid (w-6)

C20:3

20

:

3

14

306.2559

320.2715

363.2899

345.2794

289.2531

271.2426

305.2481

956.7833

956

651.5352

651

c-5,8,11-Eicosatrienoic acid

Mead Acid

C20:3

20

:

3

14

306.2559

320.2715

363.2899

345.2794

289.2531

271.2426

305.2481

956.7833

956

651.5352

651

c-5,8,11,14-Eicosatetraenoic acid

Arachidonic acid (w-6)

Ao

20

:

4

12

304.2402

318.2559

361.2743

343.2637

287.2375

269.2269

303.2324

950.7363

950

647.5039

647

c-8,11,14,17-Eicosatetraenoic acid

Eicosatetraenoic acid (w-3)

C20:4

20

:

4

12

304.2402

318.2559

361.2743

343.2637

287.2375

269.2269

303.2324

950.7363

950

647.5039

647

c-5,8,11,14,17-EicosaPentaenoic acid

EPA  (w-3)

Ep

20

:

5

10

302.2246

316.2402

359.2586

341.2481

285.2218

267.2113

301.2168

944.6894

944

643.4726

643

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Heneicosanoic acid

Heneicosylic acid

 

21

:

0

21

326.3185

340.3341

383.3525

365.3420

309.3157

291.3052

325.3107

1016.9711

1016

691.6604

691

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Docosanoic acid

Behenic acid

B

22

:

0

22

340.3341

354.3498

397.3682

379.3576

323.3314

305.3208

339.3263

1059.0180

1058

719.6917

719

c-13-Docosenoic acid

Erucic acid (n-9)

E

22

:

1

20

338.3185

352.3341

395.3525

377.3420

321.3157

303.3052

337.3107

1052.9711

1052

715.6604

715

c-13,16-Docosadienoic acid

Docosadienoic acid (w-6)

C22:2

22

:

2

18

336.3028

350.3185

393.3369

375.3263

319.3001

301.2895

335.2950

1046.9241

1046

711.6291

711

c-5,13,16-Docosatrienoic acid

Eranthic acid (w-6)

C22:3

22

:

3

16

334.2872

348.3028

391.3212

373.3107

317.2844

299.2739

333.2794

1040.8772

1040

707.5978

707

c-7,10,13,16-Docosatetraenoic acid

Adrenic acid (w-6)

C22:4

22

:

4

14

332.2715

346.2872

389.3056

371.2950

315.2688

297.2582

331.2637

1034.8302

1034

703.5665

703

c-7,10,13,16,19-DocosaPentaenoic acid

DPA (w-3)

Dp

22

:

5

12

330.2559

344.2715

387.2899

369.2794

313.2531

295.2426

329.2481

1028.7833

1028

699.5352

699

c-4,7,10,13,16,19-DocosaHexaenoic acid

DHA (w-3)

Dh

22

:

6

10

328.2402

342.2559

385.2743

367.2637

311.2375

293.2269

327.2324

1022.7363

1022

695.5039

695

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Tricosanoic acid

Tricosylic acid

C23:0

23

:

0

23

354.3498

368.3654

411.3838

393.3733

337.3470

319.3365

353.3420

1101.0650

1101

747.7230

747

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Tetracosanoic acid

Lignoceric acid

Lg

24

:

0

24

368.3654

382.3811

425.3995

407.3889

351.3627

333.3521

367.3576

1143.1119

1143

775.7543

775

c-15-Tetracosenoic acid

Nervonic acid (n-9)

N

24

:

1

22

366.3498

380.3654

423.3838

405.3733

349.3470

331.3365

365.3420

1137.0650

1136

771.7230

771

c-15,18-Tetracosadienoic acid

Tetracosadienoic acid (w-6)

C24:2

24

:

2

20

364.3341

378.3498

421.3682

403.3576

347.3314

329.3208

363.3263

1131.0180

1130

767.6917

767

c-12,15,18-Tetracosatrienoic acid

Tetracosatrienylic acid

C24:3

24

:

3

18

362.3185

376.3341

419.3525

401.3420

345.3157

327.3052

361.3107

1124.9711

1124

763.6604

763

c-9,12,15,18-Tetracosatetraenoic acid

Tetracosatetraenylic acid

C24:4

24

:

4

16

360.3028

374.3185

417.3369

399.3263

343.3001

325.2895

359.2950

1118.9241

1118

759.6291

759

c-6,9,12,15,18-Tetracosapentaenoic acid (or 21)

Tetracosapentaenylic acid

C24:5

24

:

5

14

358.2872

372.3028

415.3212

397.3107

341.2844

323.2739

357.2794

1112.8772

1112

755.5978

755

c-6,9,12,15,18,21-Tetracosahexaenoic acid

Tetracosahexaenylic acid (w-3)

C24:6

24

:

6

12

356.2715

370.2872

413.3056

395.2950

339.2688

321.2582

355.2637

1106.8302

1106

751.5665

751

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Pentacosanoic acid

Hyenic acid

C25:0

25

:

0

25

382.3811

396.3967

439.4151

421.4046

365.3783

347.3678

381.3733

1185.1589

1185

803.7856

803

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Hexacosanoic acid

Cerotic acid

Ce

26

:

0

26

396.3967

410.4124

453.4308

435.4202

379.3940

361.3834

395.3889

1227.2058

1227

831.8169

831

c-17-Hexacosenoic acid

Ximenic acid

Xi

26

:

1

24

394.3811

408.3967

451.4151

433.4046

377.3783

359.3678

393.3733

1221.1589

1221

827.7856

827

Hexacosadienoic acid

Hexacosadienylic acid

C26:2

26

:

2

22

392.3654

406.3811

449.3995

431.3889

375.3627

357.3521

391.3576

1215.1119

1215

823.7543

823

Hexacosatrienoic acid

Hexacosatrienylic acid

C26:3

26

:

3

20

390.3498

404.3654

447.3838

429.3733

373.3470

355.3365

389.3420

1209.0650

1208

819.7230

819

Hexacosatetraenoic acid

Hexacosatetraenylic acid

C26:4

26

:

4

18

388.3341

402.3498

445.3682

427.3576

371.3314

353.3208

387.3263

1203.0180

1202

815.6917

815

Hexacosapentaenoic acid

Hexacosapentaenylic acid

C26:5

26

:

5

16

386.3185

400.3341

443.3525

425.3420

369.3157

351.3052

385.3107

1196.9711

1196

811.6604

811

Hexacosahexaenoic acid

Hexacosahexaenylic acid

C26:6

26

:

6

14

384.3028

398.3185

441.3369

423.3263

367.3001

349.2895

383.2950

1190.9241

1190

807.6291

807

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Heptacosanoic acid

Carboceric acid

C27:0

27

:

0

27

410.4124

424.4280

467.4464

449.4359

393.4096

375.3991

409.4046

1269.2528

1269

859.8482

859

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Octacosanoic acid

Montanic acid

Mo

28

:

0

28

424.4280

438.4437

481.4621

463.4515

407.4253

389.4147

423.4202

1311.2997

1311

887.8795

887

Octacosenoic acid

Octacosenylic acid

C28:1

28

:

1

26

422.4124

436.4280

479.4464

461.4359

405.4096

387.3991

421.4046

1305.2528

1305

883.8482

883

Octacosadienoic acid

--

C28:2

28

:

2

24

420.3967

434.4124

477.4308

459.4202

403.3940

385.3834

419.3889

1299.2058

1299

879.8169

879

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Nonacosanoic acid

Nonacosylic acid

C29:0

29

:

0

29

438.4437

452.4593

495.4777

477.4672

421.4409

403.4304

437.4359

1353.3467

1353

915.9108

915

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Triacontanoic acid

Melissic acid

C30:0

30

:

0

30

452.4593

466.4750

509.4934

491.4828

435.4566

417.4460

451.4515

1395.3936

1395

943.9421

943

c-21-Triacontenoic acid

Lumequeic acid

C30:1

30

:

1

28

450.4437

464.4593

507.4777

489.4672

433.4409

415.4304

449.4359

1389.3467

1389

939.9108

939

 

 

C30:2

30

:

2

26

448.4280

462.4437

505.4621

487.4515

431.4253

413.4147

447.4202

1383.2997

1383

935.8795

935

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Henatriacontanoic acid

Henatriacontylic acid

C31:0

31

:

0

31

466.4750

480.4906

523.5090

505.4985

449.4722

431.4617

465.4672

1437.4406

1437

971.9734

971

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Dotriacontanoic acid

Lacceroic acid

C32:0

32

:

0

32

480.4906

494.5063

537.5247

519.5141

463.4879

445.4773

479.4828

1479.4875

1479

1000.0047

1000

Dotriacontenoic acid

Dotriacontenylic acid

C32:1

32

:

1

30

478.4750

492.4906

535.5090

517.4985

461.4722

443.4617

477.4672

1473.4406

1473

995.9734

995

Dotriacontadienoic acid

--

C32:2

32

:

2

28

476.4593

490.4750

533.4934

515.4828

459.4566

441.4460

475.4515

1467.3936

1467

991.9421

991

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Triatriacontanoic acid

Psyllic acid

C33:0

33

:

0

33

494.5063

508.5219

551.5403

533.5298

477.5035

459.4930

493.4985

1521.5345

1521

1028.0360

1028

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Tetratriacontanoic acid

Gheddic acid

C34:0

34

:

0

34

508.5219

522.5376

565.5560

547.5454

491.5192

473.5086

507.5141

1563.5814

1563

1056.0673

1056

Tetratriacontenoic acid

Tetratriacontenylic acid

C34:1

34

:

1

32

506.5063

520.5219

563.5403

545.5298

489.5035

471.4930

505.4985

1557.5345

1557

1052.0360

1052

Tetratriacontadienoic acid

--

C34:2

34

:

2

30

504.4906

518.5063

561.5247

543.5141

487.4879

469.4773

503.4828

1551.4875

1551

1048.0047

1047

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Pentatriacontanoic acid

Ceroplastic acid

C35:0

35

:

0

35

522.5376

536.5532

579.5716

561.5611

505.5348

487.5243

521.5298

1605.6284

1605

1084.0986

1084

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Hexatriacontanoic acid

Hexatriacontylic acid

C36:0

36

:

0

36

536.5532

550.5689

593.5873

575.5767

519.5505

501.5399

535.5454

1647.6753

1647

1112.1299

1112

Hexatriacontenoic acid

Hexatriacontenylic acid

C36:1

36

:

1

34

534.5376

548.5532

591.5716

573.5611

517.5348

499.5243

533.5298

1641.6284

1641

1108.0986

1108

Hexatriacontadienoic acid

--

C36:2

36

:

2

32

532.5219

546.5376

589.5560

571.5454

515.5192

497.5086

531.5141

1635.5814

1635

1104.0673

1104