Table 1.

Comparison of Human Serum/Plasma Concentrations of Fatty Acid Ethanolamides and 2-Arachidonoyl-sn-Glycerol Determined in This Study with Other Reports

	This work	Schreiber et al.6	Gachet et al.7	Balvers et al.8	Balvers et al.9	Lin et al. 201210	Ozalp and Barroso11	Ottria et al.12	Lam et al.13	Lam et al.13	Jumpertz et al.14	Caraceni et al.15	Hill et al.16	Schaefer et al.17	Bilgin et al.18	Sipe et al.19
Lipid species	S	S	P	P	P	P	P	P	P	S	P	P	S	S	P	P
AEA	0.6	0.9	1.7	0.7	1.1	2.6	0.7	0.8	0.72	1.01	1.8	5.1	2.6	2.0	14.5	12.8
OEA	4.2	3.7	9.9	4.2	6.1	8.6	4.9	4.9	4.6	6.0	4.0	12.6	5.5	9.6	162.5	107.9
PEA	419.4*	28.4	23	4.7	4.9	8.0	5.2	24.8	16.9	16.3	–	12.6	12.5	20.5	203.6	213.3
2AG	12.1	–	16.5	18.8	–	–	18.8	–	–	–	32.8	1.7	39.0	10.0	11.8	5.6

Values are expressed in pmol per mL of serum. The PEA value obtained in this work is marked with an asterisk, indicating an artifact due to contamination. In the selected reports, when only plotted and not reported in the text, values were back calculated from digitized images.

2AG, 2-arachidonoyl-sn-glycerol; AEA, arachidonoylethanolamide, anandamide; OEA, oleoylethanolamide; P, plasma; PEA, palmitoylethanolamide; S, serum.