Table 2.

Number of metabolites that were measured with each protocol according to chemical class

Protocol	Total	1	2	3	4	5	6	7	8
Analyte class
Total	630	131	251	100	149	132	303	342	137
Alkaloids	1	1	1	1	1	1	1	1	1
Amine oxides	1	0	0	0	0	0	0	0	0
Amino acids	20	20	19	19	19	19	20	20	19
Amino acid related	30	25	22	23	23	22	26	25	23
Bile acids	14	11	14	14	14	14	14	14	14
Biogenic amines	9	8	6	6	6	6	7	7	6
Carbohydrates and related	1	1	0	0	0	0	1	0	0
Carboxylic acids	7	4	2	3	2	2	3	4	2
Cresols	1	1	1	1	1	1	1	1	1
Fatty acids	12	3	9	7	9	7	10	10	7
Hormones and related	4	1	2	2	2	1	2	2	2
Indoles and derivatives	4	4	3	4	4	2	4	3	4
Nucleobases and related	2	2	2	2	2	2	2	2	2
Vitamins and cofactors	1	1	1	1	1	1	1	1	1
Acylcarnitines	40	6	2	2	2	2	4	6	2
Glycerophospholipide (lysophasphatidylcholines and phosphatidylcholines)	90	5	25	7	18	10	27	38	10
Sphingomyelins	15	3	5	1	3	3	6	7	3
Cholesteryl esters	22	3	3	0	0	0	4	6	0
Ceramides	28	0	22	0	15	10	24	26	6
Dihydroceramides	8	0	2	0	0	0	1	2	0
Glycosylceramides (monohexosylceramides, dihexosylceramides, and Trihexosylceramides)	34	1	17	0	7	7	24	22	4
Diglycerides	44	6	14	4	11	5	17	18	4
Triglycerides	242	25	79	3	9	17	104	127	26
Metabolism indicators	232	66	72	85	78	86	99	96	84