Table 1.

Comparison of different extraction methods.

EXTRACTION MEDIUM	ELUENT	RECOVERIES (%)
		MELAMINE	CYROMAZINE
Standard solutions
Strata-X (SPE)	1 mL MeOH 1 mL ACN	47.5	58.7
Lichrolut RP-18 (SPE)	1 mL MeOH 1 mL ACN	<5%
Egg yolk
Strata-X (MSPD)	1 mL MeOH 1 mL ACN	34.1	12.9
QuEChERS	2 mL ACN	8.7	52.7
QuEChERS	2 mL MeOH	67.8	40.8
QuEChERS	1 mL MeOH 1 mL ACN	74.5	75.3