Table 2. The intra- and interday precision of validated HPLC method for biogenic amines in food matrices.

Matrix	Concentration (mg/kg)	Intraday (RSD, %), n = 5								Interday (RSD, %), n = 5								AOAC (RSD, %)2)
		Trp1)	β-phe	Put	Cad	His	Tyr	Spd	Spm	Trp1)	β-phe	Put	Cad	His	Tyr	Spd	Spm
Apple juice (Non fatty liquid group)	10	4.58	5.44	3.57	2.63	5.90	4.20	4.19	3.99	4.22	5.44	3.57	4.57	5.15	5.41	4.15	5.40	< 6%
	100	3.66	3.80	3.35	3.59	2.39	2.82	2.52	2.84	3.92	3.80	3.35	3.68	3.27	3.22	3.94	3.54	< 4%
	500	3.84	2.08	2.57	3.73	3.46	2.45	3.32	3.00	2.78	2.08	2.57	3.84	3.14	2.68	3.35	3.39	< 4%
Juk (Non fatty solid group)	10	3.70	5.21	5.03	4.29	5.06	5.95	3.37	3.01	4.61	3.24	5.03	2.47	5.06	5.95	3.37	4.96	< 6%
	100	3.69	3.59	3.28	2.48	3.65	3.45	3.18	2.58	3.40	3.59	3.28	2.39	3.65	3.45	3.18	3.50	< 4%
	500	2.75	3.49	2.12	3.63	3.65	3.90	2.85	3.81	2.23	3.49	3.78	3.73	3.65	3.90	2.85	3.63	< 4%
Corn oil (Fatty liquid group)	10	4.80	2.58	2.89	2.74	2.31	1.86	4.09	2.22	4.18	3.11	3.23	3.78	3.32	3.06	4.09	4.51	< 6%
	100	2.82	3.17	3.56	2.73	3.24	2.79	2.16	2.32	2.90	3.17	3.58	2.73	3.29	2.79	2.16	2.32	< 4%
	500	2.70	2.73	2.25	2.40	1.88	2.19	3.17	2.20	2.90	2.73	2.37	2.40	3.19	2.64	3.17	2.75	< 4%
Peanut butter (Fatty solid group)	10	4.66	5.41	3.87	4.84	3.15	2.19	4.55	3.61	5.47	5.90	3.68	3.38	3.11	5.96	4.59	5.31	< 6%
	100	2.56	3.53	2.11	3.48	2.88	2.48	2.85	3.71	3.36	3.14	3.17	3.48	2.88	2.44	3.11	3.94	< 4%
	500	3.89	3.34	2.97	3.02	3.28	3.20	3.29	2.47	3.02	3.34	2.61	3.02	3.28	3.29	3.75	3.55	< 4%

¹⁾Trp, tryptamine; Phe, β-phenylethylamine; Put, putrescine; Cad, cadaverine; His, histamine; Tyr, tyramine; Spd, spermidine; Spm, spermine.

²⁾AOAC criteria.