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Articles

Development of an indirect competitive enzyme-linked immunosorbent assay and immunochromatographic assay for hydrocortisone residues in milk

, , , , , & show all
Pages 476-488 | Received 10 Nov 2016, Accepted 17 Feb 2017, Published online: 13 Mar 2017

Figures & data

Table 1. Cross-reaction results of mAb 2G8.

Figure 1. Schematic diagram of the immunochromatographic strip for HDS. The strip is composed of a sample pad, a NC membrane, a PVC backing pad, and an absorption pad.

Figure 1. Schematic diagram of the immunochromatographic strip for HDS. The strip is composed of a sample pad, a NC membrane, a PVC backing pad, and an absorption pad.

Figure 2. LC–MS analysis of HDS derivatives.

Figure 2. LC–MS analysis of HDS derivatives.

Figure 3. The UV–Vis spectroscopy of HDS, HDS-HS, protein and conjugates; (a) confirmation of immunogen (HDS-HS–KLH); (b) confirmation of coating antigen (HDS–OVA).

Figure 3. The UV–Vis spectroscopy of HDS, HDS-HS, protein and conjugates; (a) confirmation of immunogen (HDS-HS–KLH); (b) confirmation of coating antigen (HDS–OVA).

Figure 4. Standard curve of inhibition. Standards 0.02, 0.05, 0.1, 0.2, 0.5, 1, and 2 ng/mL. Each point represents the mean of ±SD of three replicates. IC50 of 2G8 was 0.095 ng/mL, LOD was 0.013 ng/mL, and the linear range of detection was from 0.0258 to 0.356 ng/mL.

Figure 4. Standard curve of inhibition. Standards 0.02, 0.05, 0.1, 0.2, 0.5, 1, and 2 ng/mL. Each point represents the mean of ±SD of three replicates. IC50 of 2G8 was 0.095 ng/mL, LOD was 0.013 ng/mL, and the linear range of detection was from 0.0258 to 0.356 ng/mL.

Figure 5. Image of detection HDS by immunochromatographic strip in milk. A series of milk samples spiked HDS were subjected to the immunochromatographic strip test. 1 = 0 ng/mL, 2 = 0.2 ng/mL, 3 = 0.5 ng/mL, 4 = 1 ng/mL, and 5 = 2 ng/mL. Cutoff value was 2 ng/mL.

Figure 5. Image of detection HDS by immunochromatographic strip in milk. A series of milk samples spiked HDS were subjected to the immunochromatographic strip test. 1 = 0 ng/mL, 2 = 0.2 ng/mL, 3 = 0.5 ng/mL, 4 = 1 ng/mL, and 5 = 2 ng/mL. Cutoff value was 2 ng/mL.

Table 2. Recovery of HDS in milk by ic-ELISA and strip assay (n = 3).

Table 3. ic-ELISA and strip analysis of HDS in milk samples (n = 3).

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