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. 2020 May 1;9(5):549. doi: 10.3390/foods9050549

Table 3.

Tentative identification of some frequently occurring contaminants, observed in the LC-MS chromatograms of the analyzed extracts.

m/z (ESI+) Tentative Identification tR (min) Material Reference
228 N-butyl-p-toluenesulphonamide;
unknown (present in oleamide standard);
myristamide		 8.44 Insulin syringe (1 mL),
plastic syringe (5 mL)		 [33,35,46]
242 Tetrabutylammonium cation 11.03, 12.16 Plastic syringe (5 mL) [47]
245 Oxotris(propan-2-olato)vanadium;
2,2’-dihydroxy-4-methoxybenzophenone;
1,1’-azobis(cyclohexanecarbonitrile);
2,2’-dimethoxy-4,4’-benzidine;		 8.45 Insulin syringe (1 mL), plastic syringe (5 mL) [46]
250 Triallyl (iso)cyanurate 9.04 Dummy [46]
254 Unsaturated amine (present in oleamide standard) 10.37 Insulin syringe (1 mL), plastic syringe (5 mL) [35]
256 C14 Unsaturated mono alcohol derivative (present in oleamide standard);
palmitamide		 18.41 Insulin syringe (1 mL), plastic syringe (5 mL) [33,35]
268 ? 14.89 Insulin syringe (1 mL), plastic syringe (5 mL) [48]
273 Tetrapropylene glycol [M+Na]+;
monomethoxytrityl cation		 18.41 Insulin syringe (1 mL), plastic syringe (5 mL) [47,49,50]
278 2-Ethylhexyl-4-(dimethyl amino) benzoate;
ethyl 2-cyano-3,3-diphenylacrylate 		8.97 Plastic syringe (5 mL) [46]
280 Unknown (present in oleamide standard) - oxidation product? 13.49, 14.89 Insulin syringe (1 mL), plastic syringe (5 mL) [35]
282 Trans-oleamide (elaidamide) 23.77 Insulin syringe (1 mL), plastic syringe (5 mL) [51]
284 Oleamide contaminant;
stearamide;		 6.05, 21.07 Plastic syringe (5 mL) [33,35,47,48]
284 Oleamide contaminant;
stearamide;		 6.05 Food container [33,35,47,48]
301 Oleoyl chloride;
dibutylphthalate [M+Na]+;
sodium (C10-C18) alkyl sulfonate;
(nonylphenyl)phosphate		 6.05, 21.07 Plastic syringe (5 mL) [35,47,49,51]
310 ? 11.03 Plastic syringe (5 mL)
314 Ethyl stearate;
styrene trimer		 5.54 Food container,
baby bottle, dummy		 [35]
331 Pentadecyl sodium sulfate;
pentapropylene glycol [M+Na]+;
dicyclohexyl phthalate 		23.19 Baby bottle, food container [35,47,49]
341 Glycerol monostearate [M+H-H2O]+;
unknown		 18.54 Baby bottle [35]
348 ? 23.19 Baby bottle
359 Heptadecyl sodium sulfate 18.54 Baby bottle [35]
362 2-Ethylhexyl 2-cyano-3,3-diphenylacrylate;
2-(4-dodecylphenyl)indole; didecyldimethylammonium chloride		 9.04 Dummy [46]
368 N,N,N-Trimethyldocosan-1-aminium cation 8.97, 10.43 Plastic syringe (5 mL) [47,49]
369 2,2’-(1,4-phenylene) bis[4H-3,1-benzoxazin-4-one];
N-[2-[(2-hydroxyethyl)amino]ethyl]oleamide;
2,2’-methylene bis(4-ethyl-6-tert-butylphenol);
lignoceric acid;
2-ethylhexyl palmitate		 23.19 Baby bottle [46]
371 Decamethylcyclopentasiloxane;
pentasiloxane;
octaethylene glycol;
dioctyl adipate;
bis(2-ethylhexyl) adipate		 6.40 Food container,
baby bottle, dummy		 [47,48,49,51]
376 1,3,5-Tris (2,2-dimethylpropionylamino)-benzene;
sodium 3-[(4-anilinophenyl)diazenyl]benzenesulfonate
(Acid Yellow 36)		 18.54 Baby bottle [46]
379 α-Cyano-4-hydroxycinnamic acid [M2+H]+ 9.04 Dummy [47,49]
385 Bisphenol F bis(2-chloro-1-propanol) ether 6.31 Food container,
baby bottle, dummy		 [46]
397 ? 18.54 Baby bottle [47,49]
399 Setoglaucine (Basic Blue 1);
tris-(2-butoxyethyl) phosphate;
decyl octyl adipate		 4.25, 13.29 Dummy [46]
403 Acetyltributyl citrate;
glyceryl monooleate [M+H+CH2O2]+;
unknown		 5.54 Food container,
baby bottle, dummy		 [34]
426 2-(4,6-Diphenyl-1,3,5-triazin-2-yl)-5-(hexyloxy)phenol 20.93, 23.59 Infusion bottle,
food container,
baby bottle, dummy		 [46]
431 2,5-Bis(5’-tert-butylbenzoxazol-2-yl)thiophene 12.03 Dummy [35,48]
455 ? 8.45 Plastic syringe (5 mL) [47,49]
456 ? 20.93–23.00 Infusion bottle,
food container,
baby bottle, dummy
463 Septapropylene glycol [M+K]+; 18.50 Dummy [49]
480 ? 18.50 Dummy
485 ? 2.19 Food container [47,49]
485 ? 2.19, 10.76 Baby bottle [47,49]
486 ? 2.26, 4.65 Infusion bottle
491 Bisphenol A diglycidyl ether;
derivative		 18.50, 21.60 Dummy [46]
502 ? 9.19 Baby bottle
511 1-Piperidinyloxy, 4,4’-[1,10-dioxo-1,10-decanediyl)bis(oxy)]bis[2,2,6,6-tetramethyl] 17.80 Plastic syringe (5 mL) [46]
563 4,4’-Bis(2-sulphostyryl)biphenyl, disodium salt 21.00 Insulin syringe (1 mL), plastic syringe (5 mL) [46]
567 Irganox 1330 fragment (2,6-di-tert-butylphenol split off) 4.25 Dummy [52]
740 ? 4.39 Infusion bottle
953 ? 7.91 Infusion bottle [47]
955 ? 4.45, 7.91 Infusion bottle

m/z: mass-to-charge ratio; tR: retention time; ?: unknown identity.