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Table 1 The lifetime of the CPEs

From: Preparation of ractopamine-tetraphenylborate complexed nanoparticles used as sensors to rapidly determine ractopamine residues in pork

Week	Modified CPEs		General CPEs
	Slope	Detection limit	Slope	Detection limit
First	56	7.4 × 10⁻⁸	46	2.7 × 10⁻⁷
Second	55.92	8.0 × 10⁻⁸	45.87	3.2 × 10⁻⁷
Third	55.83	8.5 × 10⁻⁸	45.03	3.8 × 10⁻⁷
Fourth	55.72	8.9 × 10⁻⁸	44.74	4.5 × 10⁻⁷
Fifth	55.43	9.4 × 10⁻⁸	43.82	6.7 × 10⁻⁷
Sixth	55.02	9.9 × 10⁻⁸	42.23	8.1 × 10⁻⁷
Seventh	54.76	1.2 × 10⁻⁷	41.36	9.3 × 10⁻⁷
Eighth	54.28	1.8 × 10⁻⁷	40.28	1.5 × 10⁻⁶
Ninth	53.82	2.5 × 10⁻⁷	39.56	2.3 × 10⁻⁶
Tenth	53.14	3.4 × 10⁻⁷	38.94	4.2 × 10⁻⁶

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