Table 1.

Detection on tetracycline in PBS using the proposed method and commercial ELISA kit.

Sample	Concentration (ng/mL)	Proposed Method (n = 5)	ELISA (n = 5)
PBS	0	−  −  −  −  −	−  −  −  −  −
	0.01024	−  −  −  −  −	−  −  −  −  −
	0.0512	+  +  +  +  +	+  +  +  +  +
	0.256	+  +  +  +  +	+  +  +  +  +
	1.28	+  +  +  +  +	+  +  +  +  +
	6.4	+  +  +  +  +	+  +  +  +  +
	32	+  +  +  +  +	+  +  +  +  +
	64	+  +  +  +  +	+  +  +  +  +

+ positive result; − negative result.