Table 2.

Stability testing of the fabricated paper chips.

Tetracycline (ng/mL)	Paper Chips Fabricated in 5 Batches					Paper Chips Conserved with Different Time
	Batch 1	Batch 2	Batch 3	Batch 4	Batch 5	Day 0	Day 2	Day 4	Day 6	Day 8
0	−	−	−	−	−	−	−	−	−	−
0.0512	+	+	+	+	+	+	+	+	+	+
0.256	+	+	+	+	+	+	+	+	+	+
1.28	+	+	+	+	+	+	+	+	+	+

+ positive result; − negative result.