ESI Common Background Ions

There are several good sources online, here are just a few:





Mono mass [M+H]+ Formula Compound ID, Possible origin and other comments
33.033491 CH3OH Methanol , Acetonitrile, solvent
42.033825 CH3CN ACN , Acetonitrile, solvent
59.060374 CH3CN ACN , Acetonitrile, solvent
63.044056 [C2H4O]nH2O PEG , Polyethylene glycol, ubiquitous polyether
64.015769 CH3CN ACN , Acetonitrile, solvent
65.059706 CH3OH Methanol , Methanol, solvent
74.060040 (CH3CN)n(CH3OH)m ACN/Methanol , ESI solvents
74.060040 C3H7NO DMF , Dimethyl formamide, solvent
77.059706 [C3H6O]nH2O PPG , Polypropylene glycol, ubiquitous polyether
79.021212 C2H6OS DMSO , Dimethylsulfoxide, solvent
83.060374 CH3CN ACN , ESI solvents
85.026000 [C2H4O]nH2O PEG , Polyethylene glycol, ubiquitous polyether
85.058868 C2D6OS d6-DMSO , d6-Dimethylsulfoxide, solvent
88.039305 (CH3CN)n(HCOOH)m ACN/FA , ESI solvents
96.041984 (CH3CN)n(CH3OH)m ACN/Methanol , ESI solvents
99.041650 [C3H6O]nH2O PPG , Polypropylene glycol, ubiquitous polyether
100.075690 C5H10NO NMP , N-methyl 2-pyrrolidone; solvent, floor stripper
100.999937 [C2H4O]nH2O PEG , Polyethylene glycol, ubiquitous polyether
101.003156 C2H6OS DMSO , Dimethylsulfoxide, solvent
101.080836 [MeOH]n[H2O]m Methanol/Water , ESI solvents
102.054955 (CH3CN)n(CH3COOH)m ACN/AA , ESI solvents
102.127725 C6H15N TEA , Triethylamine, buffer
103.955601 C2H3N ACN , Acetonitrile, solvent
104.992294 C2H3O2Na Sodium acetate , ESI solvents
105.042318 C2H3N ACN , Acetonitrile, solvent
105.953794 C2H3N ACN , Acetonitrile, solvent
107.070271 [C2H4O]nH2O PEG , Polyethylene glycol, ubiquitous polyether
115.015587 [C3H6O]nH2O PPG , Polypropylene glycol, ubiquitous polyether
115.086589 (CH3CN)n(C3H7NO)m ACN/DMF , ACN/Dimethylformamide, solvent
120.047761 C2H6OS DMSO , Dimethylsulfoxide, solvent
122.081170 C4H11NO3 TRIS , TRIS, buffer
123.062780 [MeOH]n[H2O]m Methanol/Water , ESI solvents
123.091674 C7H10N2 DMAP , Dimethylaminopyridine, solvent
124.036899 (CH3CN)n(CH3COOH)m ACN/AA , ESI solvents
129.052215 [C2H4O]nH2O PEG , Polyethylene glycol, ubiquitous polyether
130.159025 C8H19N DIPEA , Diisopropylethylamine, solvent
132.904901 Cs Cs-133 , Cesium, from Cesium Iodide used as calibrant
133.107051 [MeOH]n[H2O]m Methanol/Water , ESI solvents
135.101571 [C3H6O]nH2O PPG , Polypropylene glycol, ubiquitous polyether
137.074310 C2H6OS DMSO , Dimethylsulfoxide, solvent
142.029705 C2H6OS DMSO , Dimethylsulfoxide, solvent
144.174675 C9H21N TPA , Tripropylamine, solvent
144.982150 CH3CN ACN , Acetonitrile, solvent, together with m/z 147
145.026152 [C2H4O]nH2O PEG , Polyethylene glycol, ubiquitous polyether
146.068867 CH3CN ACN , Acetonitrile, solvent
146.980343 CH3CN ACN , Acetonitrile, solvent, together with m/z 145
147.112804 (CH3CN)n(CH3OH)m ACN/Methanol , ESI solvents
149.023321 C8H4O3 Pthalic Anhydride , Fragment ion originating from phthalate esters
150.127725 C10H15N Phenyldiethylamine , Solvent
151.096486 [C2H4O]nH2O PEG , Polyethylene glycol, ubiquitous polyether
153.138624 C9H16N2 DBU , 1,8-Diazabicyclo[5.4.0]undec-7-ene
155.088995 [MeOH]n[H2O]m Methanol/Water , ESI solvents
157.035148 C2H6OS DMSO , Dimethylsulfoxide, solvent
157.083515 [C3H6O]nH2O PPG , Polypropylene glycol, ubiquitous polyether
158.964029 C2F3O2Na NaTFA , Sodium trifluoroacetate, salt
163.038971 C10H10O4 Dimethyl phthalate , Phthalate esters, plasticizer
163.132871 C8H18O3 DGBE , Diethylene glycol monobutyl ether, scintillation cocktail
167.033886 C8H6O4 Phthalic acid , Dioctyl phthalate
169.094748 (CH3CN)n(CH3OH)m Acetonitrile/Methanol , ESI solvents
169.110460 C2D6OS d6-DMSO , d6-Dimethylsulfoxide, solvent
171.005265 C8H4O3 Phthalic anhydride , from phthalate esters, plasticizer
172.039305 C10H7NO3 4-HCCA , matrix compound
173.057452 [C3H6O]nH2O PPG , Polypropylene glycol, ubiquitous polyether
173.078430 [C2H4O]nH2O PEG , Polyethylene glycol, ubiquitous polyether
179.017092 C2H6OS DMSO , Dimethylsulfoxide, solvent
181.122306 C11H16O2 BHA , Butylated hydroxyanisole, antioxidant additives
183.080441 C13H10O DPK , Diphenyl ketone
183.143831 [MeOH]n[H2O]m Methanol/Water , ESI solvents
185.114815 C8H18O3 GE , glycol ether
186.221625 C12H27N TBA , Tributylamine, solvent
189.052367 [C2H4O]nH2O PEG , Polyethylene glycol, ubiquitous polyether
190.049870 C10H7NO3 4-HCCA , matrix compound
193.143436 [C3H6O]nH2O PPG , Polypropylene glycol, ubiquitous polyether
195.065186 C6H4[COOCH3]2 DMP , Dimethyl phthalate, Phthalate esters, plasticizer
195.122701 [C2H4O]nH2O PEG , Polyethylene glycol, ubiquitous polyether
203.104250 C11H16O2 BHA , Butylated hydroxyanisole, antioxidant additives
204.078096 C8H4O3 Phthalic anhydride , Plasticiser
205.125775 [MeOH]n[H2O]m Methanol/Water , ESI solvents
209 na Pthalic Anhydride , Phthalates Plastics, Nalgene bottles, tubing
212.031814 C10H7NO3 4-HCCA , matrix compound, sodiated
214.089626 C10H15NO2S n-BBS , n-butyl benzenesulfonamide, plasticizer
215.125380 [C3H6O]nH2O PPG , Polypropylene glycol, ubiquitous polyether
217.104645 [C2H4O]nH2O PEG , Polyethylene glycol, ubiquitous polyether
221.189991 C15H24O BTH , Butylated hydroxytoluene, Antioxidant
223.0965 C6H4[COOC2H5]2 DEP , Diethyl phthalate
225.196139 C13H24N2O DCU , N,N'-Dicyclohexylurea
228.005751 C10H7NO3 4-HCCA , matrix compound, potassiated
231.099317 [C3H6O]nH2O PPG , Polypropylene glycol, ubiquitous polyether
231.116175 C10H15NO2S n-BBS , n-butyl benzenesulfonamide, plasticizer
233.078582 [C2H4O]nH2O PEG , Polyethylene glycol, ubiquitous polyether
235.049100 na DMSO , na
236.071570 C10H15NO2S n-BBS , n-butyl benzenesulfonamide, plasticizer
237 na Pthalic Anhydride , Plasticizers, Tygon tubing, solvents
239.148916 [C2H4O]nH2O PEG , Polyethylene glycol, ubiquitous polyether
239.224852 C6H15N TEA.HCl , Triethylamine-hydrochloride, buffer
241.221902 C6H15N TEA.HCl , Triethylamine-hydrochloride, buffer
242.284225 C16H36N TBA , Tetrabutylammonium, buffer
243.116826 C19H15 Trityl cation , Trityl cation, [Ph3C]+
243.171935 C15H24O BTH , Butylated hytroxytoluene, Antioxidant additives
247.0965 C6H4(COOCH2CH=CH2)2 DAP , Diallyl phthalate
251.1278 C6H4(COO(CH2)2CH3)2 DPP , Di-n-propyl phthalate
251.185301 [C3H6O]nH2O PPG , Polypropylene glycol, ubiquitous polyether
251.200556 [C14H22O][C2H4O]n Triton , X-100, X-114, X-405, or X-45 Detergents
255 na Pthalic Anhydride , na
257.031028 C2H6OS DMSO , Dimethylsulfoxide, solvent
261.130860 [C2H4O]nH2O PEG , Polyethylene glycol, ubiquitous polyether
265.216206 [C15H24O][C2H4O]n Triton , 101 Detergents
267.171973 C12H27O4P TBP , Tributylphosphate
273.127391 C20H17O MMT , Monomethoxytrityl cation
273.167245 [C3H6O]nH2O PPG , Polypropylene glycol, ubiquitous polyether
273.182500 [C14H22O][C2H4O]n Triton , X-100, X-114, X-405, or X-45 Detergents
277.104797 [C2H4O]nH2O PEG , Polyethylene glycol, ubiquitous polyether
279.093328 C18H15OP TPO , Triphenylphosphine oxide
279.159086 C6H4(COO(CH2)3CH3)2 DBP , Dibutylphthalate, Plasticiser, phtalate ester
279.1591 C6H4(COOCH2CH(CH3)2)2 DIBP , Diisobutylphthalate
279.229450 [C14H28O][C2H4O]n Triton, reduced , X-100R, X-114R, X-405R, or X-45R Detergents
282.279140 C18H35NO Oleamide , Slip agent in polyethylene films
283.175131 [C2H4O]nH2O PEG , Polyethylene glycol, ubiquitous polyether
284.294790 C18H37NO Stearamide , Slip agent in polyethylene films
287.198150 [C15H24O][C2H4O]n Triton , 101 Detergents
288.253320 C16H33NO3 n,n-DDA , n,n-bis(2-hydroxyethyl) dodecanamide, anti-static agent
289.141182 [C3H6O]nH2O PPG , Polypropylene glycol, ubiquitous polyether
293.245100 [C15H30O][C2H4O]n Triton, reduced , 101R Detergents
295.226771 [C14H22O][C2H4O]n Triton , X-100, X-114, X-405, or X-45 Detergents
301.141030 C16H22O4 Dibutylphthalate , Dibutylphthalate, plasticizer
304.261084 C18H35NO Oleamide , Slip agent in polyethylene films
305.157075 [C2H4O]nH2O PEG , Polyethylene glycol, ubiquitous polyether
305.1747 CH3(CH2)3OOCC6H4COOC6H11 BCP , Butylcyclohexylphthalate
306.276734 C18H37NO Stearamide , Slip agent in polyethylene films
307.1904 C6H4(COO(CH2)4CH3)2 DNPP , Di-n-pentylphthalate
309.227166 [C3H6O]nH2O PPG , Polypropylene glycol, ubiquitous polyether
309.242421 [C15H24O][C2H4O]n Triton , 101 Detergents
313.1434 C19H20O4 BBP , Butyl benzyl phthalate
315.252986 C18H34O4 DBS , Dibutyl sebacate, plasticizer
317.114967 C16H22O4 Dibutylphthalate , Dibutylphthalate, plasticizer
317.208715 [C14H22O][C2H4O]n Triton , X-100, X-114, X-405, or X-45 Detergents
321.131012 [C2H4O]nH2O PEG , Polyethylene glycol, ubiquitous polyether
323.255665 [C14H28O][C2H4O]n Triton, reduced , X-100R, X-114R, X-405R, or X-45R Detergents
325.258466 C8H18O3 DGBE , Diethylene glycol monobutyl ether, scintillation cocktail
327.078073 C18H15O4P TPP , Triphenyl phosphate, flame retardant in plastics
327.201346 [C2H4O]nH2O PEG , Polyethylene glycol, ubiquitous polyether
331.1904 C6H4(COOC6H11)2 DCP , Dicyclohexyl phthalate
331.209110 [C3H6O]nH2O PPG , Polypropylene glycol, ubiquitous polyether
331.224365 [C15H24O][C2H4O]n Triton , 101 Detergents
335.2217 C20H30O4 DIHxP , Diisohexyl phthalate
335.2217 C20H30O4 DNHP , Di-n-hexyl phthalate
337.118405 C13H28O2Sn Tributyl tin formate , Tributyl tin formate, catalyst
337.271315 [C15H30O][C2H4O]n Triton, reduced , 101R Detergents
338.341740 C22H43NO Erucamide , Erucamide, (Cis-13-docosenoic amide)
339.252986 [C14H22O][C2H4O]n Triton , X-100, X-114, X-405, or X-45 Detergents
347.183047 [C3H6O]nH2O PPG , Polypropylene glycol, ubiquitous polyether
349.183290 [C2H4O]nH2O PEG , Polyethylene glycol, ubiquitous polyether
353.268636 [C15H24O][C2H4O]n Triton , 101 Detergents
355.069936 [C2H6SiO]5 Polysiloxane , Polysiloxane, (neutral methane loss from m/z 371)
360.323684 C22H43NO Erucamide , Erucamide, (Cis-13-docosenoic amide)
361.234930 [C14H22O][C2H4O]n Triton , X-100, X-114, X-405, or X-45 Detergents
363.253 C22H34O4 BDP , Butyl decyl phthalate
363.253 C22H34O4 DIHpP , Diisoheptyl phthalate
365.157227 [C2H4O]nH2O PEG , Polyethylene glycol, ubiquitous polyether
367.269031 [C3H6O]nH2O PPG , Polypropylene glycol, ubiquitous polyether
367.281880 [C14H28O][C2H4O]n Triton, reduced , X-100R, X-114R, X-405R, or X-45R Detergents
368.425075 C25H54NCl BTAC-228 , Behentrimonium chloride, personal care product additive
371.101236 [C2H6SiO]5 Polysiloxane , Polysiloxane, followed by m/z 388
371.227561 [C2H4O]nH2O PEG , Polyethylene glycol, ubiquitous polyether
371.315586 C22H42O4 DEHA , Bis(2-ethylhexyl) adipate, plasticizer
371.315586 C22H42O4 DOA , Dioctyl adipate, plasticizer
375.250580 [C15H24O][C2H4O]n Triton , 101 Detergents
379.092464 C10H7NO3 4-HCCA , matrix cluster, dimer
381.297530 [C15H30O][C2H4O]n Triton, reduced , 101R Detergents
383.279201 [C14H22O][C2H4O]n Triton , X-100, X-114, X-405, or X-45 Detergents
388.127785 [C2H6SiO]5 Polysiloxane , Polysiloxane, (see m/z 371)
389.250975 [C3H6O]nH2O PPG , Polypropylene glycol, ubiquitous polyether
391.284286 C6H4(COO(CH2)5CH(CH3)2)2 DIOP , Diisooctyl phthalate, plasticiser
391.2843 C6H4(COOCH2CH(C2H5)(CH2)3CH3)2 DEHP, DOP , Di(2-ethylhexyl) phthalate
391.2843 C6H4(COO(CH2)7CH3)2 DNOP , Di(n-octyl) phthalate
393.209505 [C2H4O]nH2O PEG , Polyethylene glycol, ubiquitous polyether
397.294851 [C15H24O][C2H4O]n Triton , 101 Detergents
405.224912 [C3H6O]nH2O PPG , Polypropylene glycol, ubiquitous polyether
405.261145 [C14H22O][C2H4O]n Triton , X-100, X-114, X-405, or X-45 Detergents
409.183442 [C2H4O]nH2O PEG , Polyethylene glycol, ubiquitous polyether
411.308095 [C14H28O][C2H4O]n Triton, reduced , X-100R, X-114R, X-405R, or X-45R Detergents
413.266230 C24H38O4 Diisooctyl phthalate , Diisooctyl phthalate, plasticiser
415.253776 [C2H4O]nH2O PEG , Polyethylene glycol, ubiquitous polyether
419.276795 [C15H24O][C2H4O]n Triton , 101 Detergents
419.3156 C6H4(COO(CH2)6CH(CH3)2)2 DINP , Diisononyl phthalate
419.3156 CH3(CH2)7OOCC6H4COO(CH2)9CH3 ODP , n-Octyl n-decyl phthalate
425.310896 [C3H6O]nH2O PPG , Polypropylene glycol, ubiquitous polyether
425.323745 [C15H30O][C2H4O]n Triton, reduced , 101R Detergents
427.305416 [C14H22O][C2H4O]n Triton , X-100, X-114, X-405, or X-45 Detergents
429.088728 [C2H6SiO]6 Polysiloxane , Polysiloxane, (neutral methane loss from m/z 445)
429.240167 C24H38O4 Diisooctyl phthalate , Diisooctyl phthalate, plasticiser
437.235720 [C2H4O]nH2O PEG , Polyethylene glycol, ubiquitous polyether
441.014789 C10H7NO3 4-HCCA , matrix-copper adduct, together with m/z 443
441.321066 [C15H24O][C2H4O]n Triton , 101 Detergents
443.012982 C10H7NO3 4-HCCA , matrix-copper adduct, together with m/z 443
445.120028 [C2H6SiO]6 Polysiloxane , Polysiloxane, followed by m/z 462
447.292840 [C3H6O]nH2O PPG , Polypropylene glycol, ubiquitous polyether
447.3469 C6H4(COO(CH2)7CH(CH3)2)2 DIDP , Diisodecyl phthalate
449.287360 [C14H22O][C2H4O]n Triton , X-100, X-114, X-405, or X-45 Detergents
449.385002 C13H24N2O DCU , N,N'-Dicyclohexylurea
453.209657 [C2H4O]nH2O PEG , Polyethylene glycol, ubiquitous polyether
453.343532 C24H44N4O4 nylon , Cyclic oligomer of polyamide 66
454.292779 C24H38O4 Diisooctyl phthalate , Diisooctyl phthalate, plasticiser, high conc formic acid
455.334310 [C14H28O][C2H4O]n Triton, reduced , X-100R, X-114R, X-405R, or X-45R Detergents
459.279991 [C2H4O]nH2O PEG , Polyethylene glycol, ubiquitous polyether
462.146577 [C2H6SiO]6 Polysiloxane , Polysiloxane (see m/z 445)
463.266777 [C3H6O]nH2O PPG , Polypropylene glycol, ubiquitous polyether
463.303010 [C15H24O][C2H4O]n Triton , 101 Detergents
469.349960 [C15H30O][C2H4O]n Triton, reduced , 101R Detergents
471.331631 [C14H22O][C2H4O]n Triton , X-100, X-114, X-405, or X-45 Detergents
475.3782 C6H4(COO(CH2)8CH(CH3)2)2 DIUP , Diisoundecyl phthalate
475.3782 C6H4(COO(CH2)10CH3)2 DUP , Diundecyl phthalate
481.261935 [C2H4O]nH2O PEG , Polyethylene glycol, ubiquitous polyether
483.352761 [C3H6O]nH2O PPG , Polypropylene glycol, ubiquitous polyether
485.347281 [C15H24O][C2H4O]n Triton , 101 Detergents
493.313575 [C14H22O][C2H4O]n Triton , X-100, X-114, X-405, or X-45 Detergents
494.565925 C34H72NCl DPDMA , Dipalmityldimethylammonium chloride, personal care products additive
497.235872 [C2H4O]nH2O PEG , Polyethylene glycol, ubiquitous polyether
499.360525 [C14H28O][C2H4O]n Triton, reduced , X-100R, X-114R, X-405R, or X-45R Detergents
503.107520 [C2H6SiO]7 Polysiloxane , Polysiloxane, (neutral methane loss from m/z 519)
503.306206 [C2H4O]nH2O PEG , Polyethylene glycol, ubiquitous polyether
505.334705 [C3H6O]nH2O PPG , Polypropylene glycol, ubiquitous polyether
507.329225 [C15H24O][C2H4O]n Triton , 101 Detergents
513.376175 [C15H30O][C2H4O]n Triton, reduced , 101R Detergents
515.357846 [C14H22O][C2H4O]n Triton , X-100, X-114, X-405, or X-45 Detergents
515.412857 C30H58O4S DDTDP , Didodecyl 3,3'-thiodipropionate, antioxidant
519.138820 [C2H6SiO]7 Polysiloxane , Polysiloxane, followed by m/z 536
521.308642 [C3H6O]nH2O PPG , Polypropylene glycol, ubiquitous polyether
522.597225 C36H76NCl SPDMA , Stearyl-palmityldimethylammonium chloride, personal care product additive
525.288150 [C2H4O]nH2O PEG , Polyethylene glycol, ubiquitous polyether
529.373496 [C15H24O][C2H4O]n Triton , 101 Detergents
531.407772 C30H58O5S DDTDP , Didodecyl 3,3'-thiodipropionate oxidized to sulfoxide, antioxidant
531.4408 C6H4(COO(CH2)10CH(CH3)2)2 DIUP , Diisotridecyl phthalate
531.4408 C6H4(COO(CH2)12CH3)2 DTDP , Ditridecyl phthalate
531.477171 C35H62O3 Irganox , Irganox 1076, antioxidant in synthetic polymers, antioxidant
536.165369 [C2H6SiO]7 Polysiloxane , Polysiloxane (see m/z 519)
537.339790 [C14H22O][C2H4O]n Triton , X-100, X-114, X-405, or X-45 Detergents
537.879009 C2H4O2 AA-Fe-O- complex , during ESI with metal tips and AA
541.262087 [C2H4O]nH2O PEG , Polyethylene glycol, ubiquitous polyether
541.394626 [C3H6O]nH2O PPG , Polypropylene glycol, ubiquitous polyether
543.386740 [C14H28O][C2H4O]n Triton, reduced , X-100R, X-114R, X-405R, or X-45R Detergents
547.332421 [C2H4O]nH2O PEG , Polyethylene glycol, ubiquitous polyether
547.402687 C30H58O6S DDTDP , Didodecyl 3,3'-thiodipropionate oxidized to sulfone, antioxidant
550.628525 C38H80NCl DSDMA , Distearyldimethylammonium chloride, personal care products additive
551.355440 [C15H24O][C2H4O]n Triton , 101 Detergents
553.389716 C30H58O5S DDTDP , Didodecyl 3,3'-thiodipropionate oxidized to sulfoxide, antioxidant
553.459115 C35H62O3 Irganox , Irganox 1076, antioxidant in synthetic polymers, antioxidant
555.889574 C2H4O2 AA-Fe-O- complex , during ESI with metal tips and AA
557.402390 [C15H30O][C2H4O]n Triton, reduced , 101R Detergents
559.384061 [C14H22O][C2H4O]n Triton , X-100, X-114, X-405, or X-45 Detergents
563.376570 [C3H6O]nH2O PPG , Polypropylene glycol, ubiquitous polyether
568.135058 C10H7NO3 4-HCCA , matrix cluster, trimer
569.314365 [C2H4O]nH2O PEG , Polyethylene glycol, ubiquitous polyether
573.399711 [C15H24O][C2H4O]n Triton , 101 Detergents
577.126312 [C2H6SiO]8 Polysiloxane , Polysiloxane, (neutral methane loss from m/z 593)
579.350507 [C3H6O]nH2O PPG , Polypropylene glycol, ubiquitous polyether
581.366005 [C14H22O][C2H4O]n Triton , X-100, X-114, X-405, or X-45 Detergents
585.288302 [C2H4O]nH2O PEG , Polyethylene glycol, ubiquitous polyether
585.358571 C30H58O6S Didodecyl 3,3'-thiodipropanoate sulfone product , Antioxidant
587.412955 [C14H28O][C2H4O]n Triton, reduced , X-100R, X-114R, X-405R, or X-45R Detergents
591.358636 [C2H4O]nH2O PEG , Polyethylene glycol, ubiquitous polyether
593.157612 [C2H6SiO]8 Polysiloxane , Polysiloxane, followed by m/z 610
595.381655 [C15H24O][C2H4O]n Triton , 101 Detergents
597.900139 C2H4O2 AA-Fe-O- complex , during ESI with metal tips and AA
599.436491 [C3H6O]nH2O PPG , Polypropylene glycol, ubiquitous polyether
601.428605 [C15H30O][C2H4O]n Triton, reduced , 101R Detergents
603.410276 [C14H22O][C2H4O]n Triton , X-100, X-114, X-405, or X-45 Detergents
605.292279 C24H44N4O4 Nylon 66 polymer , Filter
606.091488 C10H7NO3 4-HCCA , matrix cluster, trimer, potassiated
610.184161 [C2H6SiO]8 Polysiloxane , Polysiloxane (see m/z 593)
613.340580 [C2H4O]nH2O PEG , Polyethylene glycol, ubiquitous polyether
615.403750 C32H58N2O7S CHAPS , 3-[(3-Cholamidopropyl)dimethylammonio]-1-propanesulfonate
617.425926 [C15H24O][C2H4O]n Triton , 101 Detergents
621.418435 [C3H6O]nH2O PPG , Polypropylene glycol, ubiquitous polyether
621.972909 C3H6O2 Propionic acid Fe-O complex , during ESI with metal tips and AA
625.392220 [C14H22O][C2H4O]n Triton , X-100, X-114, X-405, or X-45 Detergents
629.314517 [C2H4O]nH2O PEG , Polyethylene glycol, ubiquitous polyether
631.439170 [C14H28O][C2H4O]n Triton, reduced , X-100R, X-114R, X-405R, or X-45R Detergents
635.384851 [C2H4O]nH2O PEG , Polyethylene glycol, ubiquitous polyether
637.392372 [C3H6O]nH2O PPG , Polypropylene glycol, ubiquitous polyether
639.407870 [C15H24O][C2H4O]n Triton , 101 Detergents
644.046824 C10H7NO3 4-HCCA , Matrix compound
645.454820 [C15H30O][C2H4O]n Triton, reduced , 101R Detergents
647.436491 [C14H22O][C2H4O]n Triton , X-100, X-114, X-405, or X-45 Detergents
651.145104 [C2H6SiO]9 Polysiloxane , Polysiloxane, (neutral methane loss from m/z 667)
657.366795 [C2H4O]nH2O PEG , Polyethylene glycol, ubiquitous polyether
657.478356 [C3H6O]nH2O PPG , Polypropylene glycol, ubiquitous polyether
657.921273 C2H4O2 AA , Solvent
661.452141 [C15H24O][C2H4O]n Triton , 101 Detergents
666.028769 C10H7NO3 4-HCCA , Matrix compound
667.176404 [C2H6SiO]9 Polysiloxane , Polysiloxane, followed by m/z 684
669.418435 [C14H22O][C2H4O]n Triton , X-100, X-114, X-405, or X-45 Detergents
673.340732 [C2H4O]nH2O PEG , Polyethylene glycol, ubiquitous polyether
675.465385 [C14H28O][C2H4O]n Triton, reduced , X-100R, X-114R, X-405R, or X-45R Detergents
679.411066 [C2H4O]nH2O PEG , Polyethylene glycol, ubiquitous polyether
679.460300 [C3H6O]nH2O PPG , Polypropylene glycol, ubiquitous polyether
679.511660 C36H66N6O6 nylon , Cyclic oligomer of polyamide 66
680.994882 C10H7NO3 4-HCCA , Matrix compound
683.434085 [C15H24O][C2H4O]n Triton , 101 Detergents
684.202953 [C2H6SiO]9 Polysiloxane , Polysiloxane (see m/z 667)
689.481035 [C15H30O][C2H4O]n Triton, reduced , 101R Detergents
691.462706 [C14H22O][C2H4O]n Triton , X-100, X-114, X-405, or X-45 Detergents
695.434237 [C3H6O]nH2O PPG , Polypropylene glycol, ubiquitous polyether
701.393010 [C2H4O]nH2O PEG , Polyethylene glycol, ubiquitous polyether
701.493605 C36H66N6O6 Nylon 66 polymer , Filter
705.478356 [C15H24O][C2H4O]n Triton , 101 Detergents
713.444650 [C14H22O][C2H4O]n Triton , X-100, X-114, X-405, or X-45 Detergents
715.520221 [C3H6O]nH2O PPG , Polypropylene glycol, ubiquitous polyether
717.366947 [C2H4O]nH2O PEG , Polyethylene glycol, ubiquitous polyether
717.467543 C36H66N6O6 Nylon 66 polymer , Filter
719.491600 [C14H28O][C2H4O]n Triton, reduced , X-100R, X-114R, X-405R, or X-45R Detergents
723.437281 [C2H4O]nH2O PEG , Polyethylene glycol, ubiquitous polyether
725.163896 [C2H6SiO]10 Polysiloxane , Polysiloxane, (neutral methane loss from m/z 741)
727.460300 [C15H24O][C2H4O]n Triton , 101 Detergents
733.507250 [C15H30O][C2H4O]n Triton, reduced , 101R Detergents
735.488921 [C14H22O][C2H4O]n Triton , X-100, X-114, X-405, or X-45 Detergents
737.502165 [C3H6O]nH2O PPG , Polypropylene glycol, ubiquitous polyether
741.195196 [C2H6SiO]10 Polysiloxane , Polysiloxane, followed by m/z 758
745.419225 [C2H4O]nH2O PEG , Polyethylene glycol, ubiquitous polyether
749.504571 [C15H24O][C2H4O]n Triton , 101 Detergents
753.476102 [C3H6O]nH2O PPG , Polypropylene glycol, ubiquitous polyether
757.470865 [C14H22O][C2H4O]n Triton , X-100, X-114, X-405, or X-45 Detergents
758.221745 [C2H6SiO]10 Polysiloxane , Polysiloxane (see m/z 741)
761.393162 [C2H4O]nH2O PEG , Polyethylene glycol, ubiquitous polyether
763.517815 [C14H28O][C2H4O]n Triton, reduced , X-100R, X-114R, X-405R, or X-45R Detergents
767.463496 [C2H4O]nH2O PEG , Polyethylene glycol, ubiquitous polyether
770.046473 C3H6O2 Propionic acid , na
771.486515 [C15H24O][C2H4O]n Triton , 101 Detergents
773.562086 [C3H6O]nH2O PPG , Polypropylene glycol, ubiquitous polyether
777.533465 [C15H30O][C2H4O]n Triton, reduced , 101R Detergents
779.515136 [C14H22O][C2H4O]n Triton , X-100, X-114, X-405, or X-45 Detergents
789.445440 [C2H4O]nH2O PEG , Polyethylene glycol, ubiquitous polyether
793.530786 [C15H24O][C2H4O]n Triton , 101 Detergents
795.544030 [C3H6O]nH2O PPG , Polypropylene glycol, ubiquitous polyether
798.587845 C24H38O4 Diisooctyl phthalate , Diisooctyl phthalate, plasticiser
801.497080 [C14H22O][C2H4O]n Triton , X-100, X-114, X-405, or X-45 Detergents
803.543240 C24H38O4 Diisooctyl phthalate , Diisooctyl phthalate, plasticiser
805.419377 [C2H4O]nH2O PEG , Polyethylene glycol, ubiquitous polyether
807.544030 [C14H28O][C2H4O]n Triton, reduced , X-100R, X-114R, X-405R, or X-45R Detergents
809.486910 [C18H34O6][C2H4O]n Tween , Tween 20
811.489711 [C2H4O]nH2O PEG , Polyethylene glycol, ubiquitous polyether
811.517967 [C3H6O]nH2O PPG , Polypropylene glycol, ubiquitous polyether
815.512730 [C15H24O][C2H4O]n Triton , 101 Detergents
819.517177 C24H38O4 Diisooctyl phthalate , Diisooctyl phthalate, plasticiser
821.559680 [C15H30O][C2H4O]n Triton, reduced , 101R Detergents
823.541351 [C14H22O][C2H4O]n Triton , X-100, X-114, X-405, or X-45 Detergents
831.460407 C36H66N6O6 Nylon 66 polymer , Filter
831.603951 [C3H6O]nH2O PPG , Polypropylene glycol, ubiquitous polyether
833.089418 C10H7NO3 4-HCCA , Matrix compound
833.471655 [C2H4O]nH2O PEG , Polyethylene glycol, ubiquitous polyether
837.557001 [C15H24O][C2H4O]n Triton , 101 Detergents
839.097421 C10H7NO3 4-HCCA , matrix cluster
845.105428 C10H7NO3 4-HCCA , matrix cluster
845.523295 [C14H22O][C2H4O]n Triton , X-100, X-114, X-405, or X-45 Detergents
849.445592 [C2H4O]nH2O PEG , Polyethylene glycol, ubiquitous polyether
851.570245 [C14H28O][C2H4O]n Triton, reduced , X-100R, X-114R, X-405R, or X-45R Detergents
853.513125 [C18H34O6][C2H4O]n Tween , Tween 20
853.585895 [C3H6O]nH2O PPG , Polypropylene glycol, ubiquitous polyether
855.071358 C10H7NO3 4-HCCA , matrix cluster
855.515926 [C2H4O]nH2O PEG , Polyethylene glycol, ubiquitous polyether
859.538945 [C15H24O][C2H4O]n Triton , 101 Detergents
861.079365 C10H7NO3 4-HCCA , matrix cluster
865.549510 [C22H42O6][C2H4O]n Tween , Tween 40
865.585895 [C15H30O][C2H4O]n Triton, reduced , 101R Detergents
867.087372 C10H7NO3 4-HCCA , matrix cluster
867.567566 [C14H22O][C2H4O]n Triton , X-100, X-114, X-405, or X-45 Detergents
869.559832 [C3H6O]nH2O PPG , Polypropylene glycol, ubiquitous polyether
871.045295 C10H7NO3 4-HCCA , matrix cluster
877.497870 [C2H4O]nH2O PEG , Polyethylene glycol, ubiquitous polyether
881.583216 [C15H24O][C2H4O]n Triton , 101 Detergents
889.549510 [C14H22O][C2H4O]n Triton , X-100, X-114, X-405, or X-45 Detergents
889.645816 [C3H6O]nH2O PPG , Polypropylene glycol, ubiquitous polyether
891.565160 [C24H44O6][C2H4O]n Tween , Tween 80
893.471807 [C2H4O]nH2O PEG , Polyethylene glycol, ubiquitous polyether
893.580810 [C24H46O6][C2H4O]n Tween , Tween 60
895.596460 [C14H28O][C2H4O]n Triton, reduced , X-100R, X-114R, X-405R, or X-45R Detergents
897.539340 [C18H34O6][C2H4O]n Tween , Tween 20
899.542141 [C2H4O]nH2O PEG , Polyethylene glycol, ubiquitous polyether
903.565160 [C15H24O][C2H4O]n Triton , 101 Detergents
905.679788 C48H88N8O8 nylon , Cyclic oligomer of polyamide 66
907.993359 C10H7NO3 4-HCCA , Matrix compound
909.575725 [C22H42O6][C2H4O]n Tween , Tween 40
909.612110 [C15H30O][C2H4O]n Triton, reduced , 101R Detergents
911.593781 [C14H22O][C2H4O]n Triton , X-100, X-114, X-405, or X-45 Detergents
911.627760 [C3H6O]nH2O PPG , Polypropylene glycol, ubiquitous polyether
921.524085 [C2H4O]nH2O PEG , Polyethylene glycol, ubiquitous polyether
925.609431 [C15H24O][C2H4O]n Triton , 101 Detergents
927.601697 [C3H6O]nH2O PPG , Polypropylene glycol, ubiquitous polyether
933.575725 [C14H22O][C2H4O]n Triton , X-100, X-114, X-405, or X-45 Detergents
935.591375 [C24H44O6][C2H4O]n Tween , Tween 80
937.498022 [C2H4O]nH2O PEG , Polyethylene glycol, ubiquitous polyether
937.607025 [C24H46O6][C2H4O]n Tween , Tween 60
939.622675 [C14H28O][C2H4O]n Triton, reduced , X-100R, X-114R, X-405R, or X-45R Detergents
941.565555 [C18H34O6][C2H4O]n Tween , Tween 20
947.591375 [C15H24O][C2H4O]n Triton , 101 Detergents
947.687681 [C3H6O]nH2O PPG , Polypropylene glycol, ubiquitous polyether
953.601940 [C22H42O6][C2H4O]n Tween , Tween 40
953.638325 [C15H30O][C2H4O]n Triton, reduced , 101R Detergents
955.619996 [C14H22O][C2H4O]n Triton , X-100, X-114, X-405, or X-45 Detergents
969.635646 [C15H24O][C2H4O]n Triton , 101 Detergents
969.669625 [C3H6O]nH2O PPG , Polypropylene glycol, ubiquitous polyether
977.601940 [C14H22O][C2H4O]n Triton , X-100, X-114, X-405, or X-45 Detergents
979.617590 [C24H44O6][C2H4O]n Tween , Tween 80
981.633240 [C24H46O6][C2H4O]n Tween , Tween 60
983.648890 [C14H28O][C2H4O]n Triton, reduced , X-100R, X-114R, X-405R, or X-45R Detergents
985.591770 [C18H34O6][C2H4O]n Tween , Tween 20
985.643562 [C3H6O]nH2O PPG , Polypropylene glycol, ubiquitous polyether
991.617590 [C15H24O][C2H4O]n Triton , 101 Detergents
994.155513 C10H7NO3 4-HCCA , matrix cluster
997.628155 [C22H42O6][C2H4O]n Tween , Tween 40
997.664540 [C15H30O][C2H4O]n Triton, reduced , 101R Detergents
999.646211 [C14H22O][C2H4O]n Triton , X-100, X-114, X-405, or X-45 Detergents
1005.729546 [C3H6O]nH2O PPG , Polypropylene glycol, ubiquitous polyether
1013.661861 [C15H24O][C2H4O]n Triton , 101 Detergents
1021.628155 [C14H22O][C2H4O]n Triton , X-100, X-114, X-405, or X-45 Detergents
1023.643805 [C24H44O6][C2H4O]n Tween , Tween 80
1025.659455 [C24H46O6][C2H4O]n Tween , Tween 60
1027.675105 [C14H28O][C2H4O]n Triton, reduced , X-100R, X-114R, X-405R, or X-45R Detergents
1027.711490 [C3H6O]nH2O PPG , Polypropylene glycol, ubiquitous polyether
1029.617985 [C18H34O6][C2H4O]n Tween , Tween 20
1035.643805 [C15H24O][C2H4O]n Triton , 101 Detergents
1036.082773 C10H7NO3 4-HCCA , matrix cluster
1041.654370 [C22H42O6][C2H4O]n Tween , Tween 40
1041.690755 [C15H30O][C2H4O]n Triton, reduced , 101R Detergents
1043.672426 [C14H22O][C2H4O]n Triton , X-100, X-114, X-405, or X-45 Detergents
1043.685427 [C3H6O]nH2O PPG , Polypropylene glycol, ubiquitous polyether
1044.113952 C10H7NO3 4-HCCA , matrix cluster
1054.093338 C10H7NO3 4-HCCA , matrix cluster
1057.688076 [C15H24O][C2H4O]n Triton , 101 Detergents
1060.087889 C10H7NO3 4-HCCA , matrix cluster, pentamer, triply potassiated
1063.771411 [C3H6O]nH2O PPG , Polypropylene glycol, ubiquitous polyether
1065.654370 [C14H22O][C2H4O]n Triton , X-100, X-114, X-405, or X-45 Detergents
1066.095896 C10H7NO3 4-HCCA , matrix cluster, pentamer, potassiated, sodiated
1067.670020 [C24H44O6][C2H4O]n Tween , Tween 80
1069.685670 [C24H46O6][C2H4O]n Tween , Tween 60
1071.701320 [C14H28O][C2H4O]n Triton, reduced , X-100R, X-114R, X-405R, or X-45R Detergents
1073.644200 [C18H34O6][C2H4O]n Tween , Tween 20
1079.670020 [C15H24O][C2H4O]n Triton , 101 Detergents
1085.680585 [C22H42O6][C2H4O]n Tween , Tween 40
1085.716970 [C15H30O][C2H4O]n Triton, reduced , 101R Detergents
1085.753355 [C3H6O]nH2O PPG , Polypropylene glycol, ubiquitous polyether
1087.698641 [C14H22O][C2H4O]n Triton , X-100, X-114, X-405, or X-45 Detergents
1101.714291 [C15H24O][C2H4O]n Triton , 101 Detergents
1101.727292 [C3H6O]nH2O PPG , Polypropylene glycol, ubiquitous polyether
1109.680585 [C14H22O][C2H4O]n Triton , X-100, X-114, X-405, or X-45 Detergents
1111.696235 [C24H44O6][C2H4O]n Tween , Tween 80
1113.711885 [C24H46O6][C2H4O]n Tween , Tween 60
1115.727535 [C14H28O][C2H4O]n Triton, reduced , X-100R, X-114R, X-405R, or X-45R Detergents
1117.670415 [C18H34O6][C2H4O]n Tween , Tween 20
1121.813276 [C3H6O]nH2O PPG , Polypropylene glycol, ubiquitous polyether
1123.696235 [C15H24O][C2H4O]n Triton , 101 Detergents
1129.706800 [C22H42O6][C2H4O]n Tween , Tween 40
1129.743185 [C15H30O][C2H4O]n Triton, reduced , 101R Detergents
1143.795220 [C3H6O]nH2O PPG , Polypropylene glycol, ubiquitous polyether
1155.722450 [C24H44O6][C2H4O]n Tween , Tween 80
1157.738100 [C24H46O6][C2H4O]n Tween , Tween 60
1159.769157 [C3H6O]nH2O PPG , Polypropylene glycol, ubiquitous polyether
1161.696630 [C18H34O6][C2H4O]n Tween , Tween 20
1173.733015 [C22H42O6][C2H4O]n Tween , Tween 40
1179.855141 [C3H6O]nH2O PPG , Polypropylene glycol, ubiquitous polyether
1199.748665 [C24H44O6][C2H4O]n Tween , Tween 80
1201.764315 [C24H46O6][C2H4O]n Tween , Tween 60
1201.837085 [C3H6O]nH2O PPG , Polypropylene glycol, ubiquitous polyether
1205.722845 [C18H34O6][C2H4O]n Tween , Tween 20
1217.759230 [C22H42O6][C2H4O]n Tween , Tween 40
1217.811022 [C3H6O]nH2O PPG , Polypropylene glycol, ubiquitous polyether
1225.125367 C10H7NO3 4-HCCA , matrix cluster, hexamer, potassiated, sodiated
1229.800224 C32H58N2O7S CHAPS , 3-[(3-Cholamidopropyl)dimethylammonio]-1-propanesulfonate
1243.774880 [C24H44O6][C2H4O]n Tween , Tween 80
1245.790530 [C24H46O6][C2H4O]n Tween , Tween 60
1249.749060 [C18H34O6][C2H4O]n Tween , Tween 20
1261.785445 [C22H42O6][C2H4O]n Tween , Tween 40
1287.801095 [C24H44O6][C2H4O]n Tween , Tween 80
1289.816745 [C24H46O6][C2H4O]n Tween , Tween 60
1293.775275 [C18H34O6][C2H4O]n Tween , Tween 20
1305.811660 [C22H42O6][C2H4O]n Tween , Tween 40
1331.827310 [C24H44O6][C2H4O]n Tween , Tween 80
1333.842960 [C24H46O6][C2H4O]n Tween , Tween 60
1337.801490 [C18H34O6][C2H4O]n Tween , Tween 20
1349.837875 [C22H42O6][C2H4O]n Tween , Tween 40
1375.853525 [C24H44O6][C2H4O]n Tween , Tween 80
1377.869175 [C24H46O6][C2H4O]n Tween , Tween 60
1381.827705 [C18H34O6][C2H4O]n Tween , Tween 20
1393.864090 [C22H42O6][C2H4O]n Tween , Tween 40
1419.879740 [C24H44O6][C2H4O]n Tween , Tween 80
1421.895390 [C24H46O6][C2H4O]n Tween , Tween 60
1425.853920 [C18H34O6][C2H4O]n Tween , Tween 20
1437.890305 [C22H42O6][C2H4O]n Tween , Tween 40
1463.905955 [C24H44O6][C2H4O]n Tween , Tween 80
1465.921605 [C24H46O6][C2H4O]n Tween , Tween 60
1469.880135 [C18H34O6][C2H4O]n Tween , Tween 20
1481.916520 [C22H42O6][C2H4O]n Tween , Tween 40
1507.932170 [C24H44O6][C2H4O]n Tween , Tween 80
1509.947820 [C24H46O6][C2H4O]n Tween , Tween 60
1513.906350 [C18H34O6][C2H4O]n Tween , Tween 20
1525.942735 [C22H42O6][C2H4O]n Tween , Tween 40
1551.958385 [C24H44O6][C2H4O]n Tween , Tween 80
1553.974035 [C24H46O6][C2H4O]n Tween , Tween 60
1557.932565 [C18H34O6][C2H4O]n Tween , Tween 20
1569.968950 [C22H42O6][C2H4O]n Tween , Tween 40
1595.984600 [C24H44O6][C2H4O]n Tween , Tween 80
1598.000250 [C24H46O6][C2H4O]n Tween , Tween 60
1601.958780 [C18H34O6][C2H4O]n Tween , Tween 20
1613.995165 [C22H42O6][C2H4O]n Tween , Tween 40
1640.010815 [C24H44O6][C2H4O]n Tween , Tween 80
1642.026465 [C24H46O6][C2H4O]n Tween , Tween 60
1645.984995 [C18H34O6][C2H4O]n Tween , Tween 20
1658.021380 [C22H42O6][C2H4O]n Tween , Tween 40
1684.037030 [C24H44O6][C2H4O]n Tween , Tween 80
1686.052680 [C24H46O6][C2H4O]n Tween , Tween 60
1690.011210 [C18H34O6][C2H4O]n Tween , Tween 20
1702.047595 [C22H42O6][C2H4O]n Tween , Tween 40
1728.063245 [C24H44O6][C2H4O]n Tween , Tween 80
1730.078895 [C24H46O6][C2H4O]n Tween , Tween 60
1734.037425 [C18H34O6][C2H4O]n Tween , Tween 20
1746.073810 [C22H42O6][C2H4O]n Tween , Tween 40
1772.089460 [C24H44O6][C2H4O]n Tween , Tween 80
1774.105110 [C24H46O6][C2H4O]n Tween , Tween 60
1778.063640 [C18H34O6][C2H4O]n Tween , Tween 20
1790.100025 [C22H42O6][C2H4O]n Tween , Tween 40
1816.115675 [C24H44O6][C2H4O]n Tween , Tween 80
1818.131325 [C24H46O6][C2H4O]n Tween , Tween 60
1834.126240 [C22H42O6][C2H4O]n Tween , Tween 40
1860.141890 [C24H44O6][C2H4O]n Tween , Tween 80
1862.157540 [C24H46O6][C2H4O]n Tween , Tween 60

.