





 
| Wm. Craig Byrdwell, phd | 
| Resources for Lipid Analysis in the 21st Century | 
| For a conveniently printable .pdf version of this mass list, click HERE | 

 
| For Fatty Acid Abbreviations, see ‘Fatty Acids’ page. | 
| For Fragment Identities, see ‘PI Fragments I & II’ pages. | 
| © 2005-2011 The figures and tables on this website are copyrighted in 2005-2011 by William Craig Byrdwell and Byrdwell.com. Please reference 
 | 
 
| Disclaimer: Not all fragments or adducts listed here are observed from every class of phospholipid. Every possible adduct and most fragments have been listed here for the sake of thoroughness, whether they are actually observed or not. The page for each phospholipid class will be tailored as time permits. | 
 
| Adducts of PhosphatidylInositols in COLOR are not usually observed to an appreciable extent. | 
 
| Calculated monoisotopic masses of Phosphatidyl– Inositols 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: 
 | 
 
| © 2005-2011 The figures and tables on this website are copyrighted in 2005-2011 by William Craig Byrdwell and Byrdwell.com. Please reference 
 | 



 
| Di-AoPI | 907.55 | 907 | 913.56 | 924.58 | 929.53 | 945.51 | 905.54 | 951.54 | 965.56 | 
| AohLPI | 909.57 | 909 | 915.58 | 926.59 | 931.55 | 947.52 | 907.55 | 953.56 | 967.57 | 
| DhLPI | 911.58 | 911 | 917.59 | 928.61 | 933.56 | 949.54 | 909.57 | 955.57 | 969.59 | 
| GAoPI | 913.60 | 913 | 919.61 | 930.62 | 935.58 | 951.55 | 911.58 | 957.59 | 971.60 | 
| ELnPI | 915.61 | 915 | 921.62 | 932.64 | 937.60 | 953.57 | 913.60 | 959.60 | 973.62 | 
| GhLPI | 915.61 | 915 | 921.62 | 932.64 | 937.60 | 953.57 | 913.60 | 959.60 | 973.62 | 
| AAoPI | 915.61 | 915 | 921.62 | 932.64 | 937.60 | 953.57 | 913.60 | 959.60 | 973.62 | 
| AhLPI | 917.63 | 917 | 923.64 | 934.66 | 939.61 | 955.59 | 915.61 | 961.62 | 975.63 | 
| BLnPI | 917.63 | 917 | 923.64 | 934.66 | 939.61 | 955.59 | 915.61 | 961.62 | 975.63 | 
| ELPI | 917.63 | 917 | 923.64 | 934.66 | 939.61 | 955.59 | 915.61 | 961.62 | 975.63 | 
| BLPI | 919.65 | 919 | 925.65 | 936.67 | 941.63 | 957.60 | 917.63 | 963.63 | 977.65 | 
| Di-GPI | 919.65 | 919 | 925.65 | 936.67 | 941.63 | 957.60 | 917.63 | 963.63 | 977.65 | 
| EOPI | 919.65 | 919 | 925.65 | 936.67 | 941.63 | 957.60 | 917.63 | 963.63 | 977.65 | 
| NPoPI | 919.65 | 919 | 925.65 | 936.67 | 941.63 | 957.60 | 917.63 | 963.63 | 977.65 | 
| AGPI | 921.66 | 921 | 927.67 | 938.69 | 943.64 | 959.62 | 919.65 | 965.65 | 979.67 | 
| ESPI | 921.66 | 921 | 927.67 | 938.69 | 943.64 | 959.62 | 919.65 | 965.65 | 979.67 | 
| NPPI | 921.66 | 921 | 927.67 | 938.69 | 943.64 | 959.62 | 919.65 | 965.65 | 979.67 | 
| BOPI | 921.66 | 921 | 927.67 | 938.69 | 943.64 | 959.62 | 919.65 | 965.65 | 979.67 | 
| LgPoPI | 921.66 | 921 | 927.67 | 938.69 | 943.64 | 959.62 | 919.65 | 965.65 | 979.67 | 
| Di-API | 923.68 | 923 | 929.68 | 940.70 | 945.66 | 961.63 | 921.66 | 967.67 | 981.68 | 
| BSPI | 923.68 | 923 | 929.68 | 940.70 | 945.66 | 961.63 | 921.66 | 967.67 | 981.68 | 
| LgPPI | 923.68 | 923 | 929.68 | 940.70 | 945.66 | 961.63 | 921.66 | 967.67 | 981.68 | 
| EAoPI | 941.63 | 941 | 947.64 | 958.66 | 963.61 | 979.59 | 939.61 | 985.62 | 999.63 | 
| BAoPI | 943.65 | 943 | 949.65 | 960.67 | 965.63 | 981.60 | 941.63 | 987.63 | 1001.65 | 
| EhLPI | 943.65 | 943 | 949.65 | 960.67 | 965.63 | 981.60 | 941.63 | 987.63 | 1001.65 | 
| NLnPI | 943.65 | 943 | 949.65 | 960.67 | 965.63 | 981.60 | 941.63 | 987.63 | 1001.65 | 
| NLPI | 945.66 | 945 | 951.67 | 962.69 | 967.64 | 983.62 | 943.65 | 989.65 | 1003.67 | 
| BhLPI | 945.66 | 945 | 951.67 | 962.69 | 967.64 | 983.62 | 943.65 | 989.65 | 1003.67 | 
| LgLnPI | 945.66 | 945 | 951.67 | 962.69 | 967.64 | 983.62 | 943.65 | 989.65 | 1003.67 | 
| EGPI | 947.68 | 947 | 953.68 | 964.70 | 969.66 | 985.63 | 945.66 | 991.67 | 1005.68 | 
| NOPI | 947.68 | 947 | 953.68 | 964.70 | 969.66 | 985.63 | 945.66 | 991.67 | 1005.68 | 
| LgLPI | 947.68 | 947 | 953.68 | 964.70 | 969.66 | 985.63 | 945.66 | 991.67 | 1005.68 | 
| EAPI | 949.69 | 949 | 955.70 | 966.72 | 971.67 | 987.65 | 947.68 | 993.68 | 1007.70 | 
| BGPI | 949.69 | 949 | 955.70 | 966.72 | 971.67 | 987.65 | 947.68 | 993.68 | 1007.70 | 
| LgOPI | 949.69 | 949 | 955.70 | 966.72 | 971.67 | 987.65 | 947.68 | 993.68 | 1007.70 | 
| NSPI | 949.69 | 949 | 955.70 | 966.72 | 971.67 | 987.65 | 947.68 | 993.68 | 1007.70 | 
| BAPI | 951.71 | 951 | 957.72 | 968.73 | 973.69 | 989.66 | 949.69 | 995.70 | 1009.71 | 
| LgSPI | 951.71 | 951 | 957.72 | 968.73 | 973.69 | 989.66 | 949.69 | 995.70 | 1009.71 | 
| NAoPI | 969.66 | 969 | 975.67 | 986.69 | 991.64 | 1007.62 | 967.65 | 1013.65 | 1027.67 | 
| NhLPI | 971.68 | 971 | 977.68 | 988.70 | 993.66 | 1009.63 | 969.66 | 1015.67 | 1029.68 | 
| LgAoPI | 971.68 | 971 | 977.68 | 988.70 | 993.66 | 1009.63 | 969.66 | 1015.67 | 1029.68 | 
| LghLPI | 973.69 | 973 | 979.70 | 990.72 | 995.67 | 1011.65 | 971.68 | 1017.68 | 1031.70 | 
| Di-EPI | 975.71 | 975 | 981.72 | 992.73 | 997.69 | 1013.66 | 973.69 | 1019.70 | 1033.71 | 
| NGPI | 975.71 | 975 | 981.72 | 992.73 | 997.69 | 1013.66 | 973.69 | 1019.70 | 1033.71 | 
| EBPI | 977.72 | 977 | 983.73 | 994.75 | 999.71 | 1015.68 | 975.71 | 1021.71 | 1035.73 | 
| LgGPI | 977.72 | 977 | 983.73 | 994.75 | 999.71 | 1015.68 | 975.71 | 1021.71 | 1035.73 | 
| NAPI | 977.72 | 977 | 983.73 | 994.75 | 999.71 | 1015.68 | 975.71 | 1021.71 | 1035.73 | 
| Di-BPI | 979.74 | 979 | 985.75 | 996.77 | 1001.72 | 1017.69 | 977.72 | 1023.73 | 1037.74 | 
| LgAPI | 979.74 | 979 | 985.75 | 996.77 | 1001.72 | 1017.69 | 977.72 | 1023.73 | 1037.74 | 
| NEPI | 1003.74 | 1003 | 1009.75 | 1020.77 | 1025.72 | 1041.69 | 1001.72 | 1047.73 | 1061.74 | 
| NBPI | 1005.75 | 1005 | 1011.76 | 1022.78 | 1027.74 | 1043.71 | 1003.74 | 1049.74 | 1063.76 | 
| LgEPI | 1005.75 | 1005 | 1011.76 | 1022.78 | 1027.74 | 1043.71 | 1003.74 | 1049.74 | 1063.76 | 
| LgBPI | 1007.77 | 1007 | 1013.78 | 1024.80 | 1029.75 | 1045.73 | 1005.75 | 1051.76 | 1065.78 | 
| Di-NPI | 1031.77 | 1031 | 1037.78 | 1048.80 | 1053.75 | 1069.73 | 1029.75 | 1075.76 | 1089.78 | 
| NLgPI | 1033.79 | 1033 | 1039.79 | 1050.81 | 1055.77 | 1071.74 | 1031.77 | 1077.78 | 1091.79 | 
| Di-LgPI | 1035.80 | 1035 | 1041.81 | 1052.83 | 1057.78 | 1073.76 | 1033.79 | 1079.79 | 1093.81 | 
| Phosphatidyl Inositols | |||||||||
| Adduct : | Protonated | 
 | Lithium | Ammonium | Sodium | Potassium | Deprotonated (–) | Formate (–) | Acetate (–) | 
| Abbrev. | [M+H]+ | Nom. Mass | [M+Li]+ | [M+NH4]+ | [M+Na]+ | [M+K]+ | [M-H]– | [M+HCOO]– | [M+CH3COO]– | 
| Di-CoPI | 531.24 | 531 | 537.25 | 548.27 | 553.22 | 569.20 | 529.22 | 575.23 | 589.24 | 
| Di-EnPI | 559.27 | 559 | 565.28 | 576.30 | 581.25 | 597.23 | 557.26 | 603.26 | 617.28 | 
| Di-CyPI | 587.30 | 587 | 593.31 | 604.33 | 609.28 | 625.26 | 585.29 | 631.29 | 645.31 | 
| Di-PgPI | 615.33 | 615 | 621.34 | 632.36 | 637.32 | 653.29 | 613.32 | 659.32 | 673.34 | 
| Di-CaPI | 643.36 | 643 | 649.37 | 660.39 | 665.35 | 681.32 | 641.35 | 687.35 | 701.37 | 
| Di-(11)PI | 671.40 | 671 | 677.40 | 688.42 | 693.38 | 709.35 | 669.38 | 715.39 | 729.40 | 
| Di-LaPI | 699.43 | 699 | 705.43 | 716.45 | 721.41 | 737.38 | 697.41 | 743.42 | 757.43 | 
| LaMPI | 727.46 | 727 | 733.47 | 744.48 | 749.44 | 765.41 | 725.44 | 771.45 | 785.46 | 
| Di-(13)PI | 727.46 | 727 | 733.47 | 744.49 | 749.44 | 765.42 | 725.44 | 771.45 | 785.46 | 
| LaPoPI | 753.47 | 753 | 759.48 | 770.50 | 775.46 | 791.43 | 751.46 | 797.46 | 811.48 | 
| LaPPI | 755.49 | 755 | 761.50 | 772.52 | 777.47 | 793.45 | 753.47 | 799.48 | 813.49 | 
| Di-MPI | 755.49 | 755 | 761.50 | 772.52 | 777.47 | 793.45 | 753.47 | 799.48 | 813.49 | 
| LaLnPI | 777.47 | 777 | 783.48 | 794.50 | 799.46 | 815.43 | 775.46 | 821.46 | 835.48 | 
| LaLPI | 779.49 | 779 | 785.50 | 796.52 | 801.47 | 817.45 | 777.47 | 823.48 | 837.49 | 
| LaOPI | 781.50 | 781 | 787.51 | 798.53 | 803.49 | 819.46 | 779.49 | 825.49 | 839.51 | 
| MPoPI | 781.50 | 781 | 787.51 | 798.53 | 803.49 | 819.46 | 779.49 | 825.49 | 839.51 | 
| LaSPI | 783.52 | 783 | 789.53 | 800.55 | 805.50 | 821.48 | 781.50 | 827.51 | 841.53 | 
| MPPI | 783.52 | 783 | 789.53 | 800.55 | 805.50 | 821.48 | 781.50 | 827.51 | 841.53 | 
| Di-(15)PI | 783.52 | 783 | 789.53 | 800.55 | 805.50 | 821.48 | 781.51 | 827.51 | 841.53 | 
| MLnPI | 805.50 | 805 | 811.51 | 822.53 | 827.49 | 843.46 | 803.49 | 849.49 | 863.51 | 
| MLPI | 807.52 | 807 | 813.53 | 824.55 | 829.50 | 845.48 | 805.50 | 851.51 | 865.53 | 
| Di-PoPI | 807.52 | 807 | 813.53 | 824.55 | 829.50 | 845.48 | 805.50 | 851.51 | 865.53 | 
| PPoPI | 809.54 | 809 | 815.54 | 826.56 | 831.52 | 847.49 | 807.52 | 853.53 | 867.54 | 
| MOPI | 809.54 | 809 | 815.54 | 826.56 | 831.52 | 847.49 | 807.52 | 853.53 | 867.54 | 
| Di-PPI | 811.55 | 811 | 817.56 | 828.58 | 833.53 | 849.51 | 809.54 | 855.54 | 869.56 | 
| MSPI | 811.55 | 811 | 817.56 | 828.58 | 833.53 | 849.51 | 809.54 | 855.54 | 869.56 | 
| PoLnPI | 831.52 | 831 | 837.53 | 848.55 | 853.50 | 869.48 | 829.50 | 875.51 | 889.53 | 
| PLnPI | 833.54 | 833 | 839.54 | 850.56 | 855.52 | 871.49 | 831.52 | 877.53 | 891.54 | 
| PoLPI | 833.54 | 833 | 839.54 | 850.56 | 855.52 | 871.49 | 831.52 | 877.53 | 891.54 | 
| PLPI | 835.55 | 835 | 841.56 | 852.58 | 857.53 | 873.51 | 833.54 | 879.54 | 893.56 | 
| PoOPI | 835.55 | 835 | 841.56 | 852.58 | 857.53 | 873.51 | 833.54 | 879.54 | 893.56 | 
| POPI | 837.57 | 837 | 843.58 | 854.59 | 859.55 | 875.52 | 835.55 | 881.56 | 895.57 | 
| PoSPI | 837.57 | 837 | 843.58 | 854.59 | 859.55 | 875.52 | 835.55 | 881.56 | 895.57 | 
| PIPI | 839.58 | 839 | 845.59 | 856.61 | 861.56 | 877.54 | 837.57 | 883.57 | 897.59 | 
| Di-MaPI | 839.58 | 839 | 845.59 | 856.61 | 861.56 | 877.54 | 837.57 | 883.57 | 897.59 | 
| Di-LnPI | 855.52 | 855 | 861.53 | 872.55 | 877.50 | 893.48 | 853.50 | 899.51 | 913.53 | 
| AoPoPI | 857.54 | 857 | 863.54 | 874.56 | 879.52 | 895.49 | 855.52 | 901.53 | 915.54 | 
| LLnPI | 857.54 | 857 | 863.54 | 874.56 | 879.52 | 895.49 | 855.52 | 901.53 | 915.54 | 
| AoPPI | 859.55 | 859 | 865.56 | 876.58 | 881.53 | 897.51 | 857.54 | 903.54 | 917.56 | 
| Di-LPI | 859.55 | 859 | 865.56 | 876.58 | 881.53 | 897.51 | 857.54 | 903.54 | 917.56 | 
| hLPoPI | 859.55 | 859 | 865.56 | 876.58 | 881.53 | 897.51 | 857.54 | 903.54 | 917.56 | 
| OLnPI | 859.55 | 859 | 865.56 | 876.58 | 881.53 | 897.51 | 857.54 | 903.54 | 917.56 | 
| hLPPI | 861.57 | 861 | 867.58 | 878.59 | 883.55 | 899.52 | 859.55 | 905.56 | 919.57 | 
| OLPI | 861.57 | 861 | 867.58 | 878.59 | 883.55 | 899.52 | 859.55 | 905.56 | 919.57 | 
| SLnPI | 861.57 | 861 | 867.58 | 878.59 | 883.55 | 899.52 | 859.55 | 905.56 | 919.57 | 
| GPoPI | 863.58 | 863 | 869.59 | 880.61 | 885.56 | 901.54 | 861.57 | 907.57 | 921.59 | 
| SLPI | 863.58 | 863 | 869.59 | 880.61 | 885.56 | 901.54 | 861.57 | 907.57 | 921.59 | 
| Di-OPI | 863.58 | 863 | 869.59 | 880.61 | 885.56 | 901.54 | 861.57 | 907.57 | 921.59 | 
| GPPI | 865.60 | 865 | 871.61 | 882.62 | 887.58 | 903.55 | 863.58 | 909.59 | 923.60 | 
| APoPI | 865.60 | 865 | 871.61 | 882.62 | 887.58 | 903.55 | 863.58 | 909.59 | 923.60 | 
| SOPI | 865.60 | 865 | 871.61 | 882.62 | 887.58 | 903.55 | 863.58 | 909.59 | 923.60 | 
| APPI | 867.61 | 867 | 873.62 | 884.64 | 889.60 | 905.57 | 865.60 | 911.60 | 925.62 | 
| Di-SPI | 867.61 | 867 | 873.62 | 884.64 | 889.60 | 905.57 | 865.60 | 911.60 | 925.62 | 
| AoLnPI | 881.54 | 881 | 887.54 | 898.56 | 903.52 | 919.49 | 879.52 | 925.53 | 939.54 | 
| AoLPI | 883.55 | 883 | 889.56 | 900.58 | 905.53 | 921.51 | 881.54 | 927.54 | 941.56 | 
| hLLnPI | 883.55 | 883 | 889.56 | 900.58 | 905.53 | 921.51 | 881.54 | 927.54 | 941.56 | 
| AoOPI | 885.57 | 885 | 891.58 | 902.59 | 907.55 | 923.52 | 883.55 | 929.56 | 943.57 | 
| hLLPI | 885.57 | 885 | 891.58 | 902.59 | 907.55 | 923.52 | 883.55 | 929.56 | 943.57 | 
| AoSPI | 887.58 | 887 | 893.59 | 904.61 | 909.56 | 925.54 | 885.57 | 931.57 | 945.59 | 
| GLnPI | 887.58 | 887 | 893.59 | 904.61 | 909.56 | 925.54 | 885.57 | 931.57 | 945.59 | 
| hLOPI | 887.58 | 887 | 893.59 | 904.61 | 909.56 | 925.54 | 885.57 | 931.57 | 945.59 | 
| GLPI | 889.60 | 889 | 895.61 | 906.62 | 911.58 | 927.55 | 887.58 | 933.59 | 947.60 | 
| ALnPI | 889.60 | 889 | 895.61 | 906.62 | 911.58 | 927.55 | 887.58 | 933.59 | 947.60 | 
| hLSPI | 889.60 | 889 | 895.61 | 906.62 | 911.58 | 927.55 | 887.58 | 933.59 | 947.60 | 
| EPoPI | 891.61 | 891 | 897.62 | 908.64 | 913.60 | 929.57 | 889.60 | 935.60 | 949.62 | 
| GOPI | 891.61 | 891 | 897.62 | 908.64 | 913.60 | 929.57 | 889.60 | 935.60 | 949.62 | 
| ALPI | 891.61 | 891 | 897.62 | 908.64 | 913.60 | 929.57 | 889.60 | 935.60 | 949.62 | 
| AOPI | 893.63 | 893 | 899.64 | 910.66 | 915.61 | 931.59 | 891.61 | 937.62 | 951.63 | 
| BPoPI | 893.63 | 893 | 899.64 | 910.66 | 915.61 | 931.59 | 891.61 | 937.62 | 951.63 | 
| EPPI | 893.63 | 893 | 899.64 | 910.66 | 915.61 | 931.59 | 891.61 | 937.62 | 951.63 | 
| GSPI | 893.63 | 893 | 899.64 | 910.66 | 915.61 | 931.59 | 891.61 | 937.62 | 951.63 | 
| ASPI | 895.65 | 895 | 901.65 | 912.67 | 917.63 | 933.60 | 893.63 | 939.63 | 953.65 | 
| BPPI | 895.65 | 895 | 901.65 | 912.67 | 917.63 | 933.60 | 893.63 | 939.63 | 953.65 |