We chose apple as the test fruit sample to verify the feasibility of this AuNPs-based sensing system in ultra-sensitive detection of OPs residues in agricultural products, and because the apple possesses various constituents including cellulose, sugars, vitamins, organic acids, minerals, polyphenols, and flavones. It is shown that the VX-spiked sample generates obvious color change in comparison with the non-spiked one (see Fig. S9 in supplementary data). The standard regression equations for various OPs (GB, GD, VX and paraoxon) in apple matrix are shown in Table 1. The concentration of OPs residues in the spiked apples are calculated based on the standard curves constructed in apple juice matrix as listed in Table 2. The values are close to the added amount, which demonstrate the method is reliable, practical, sensitive and simple when employing it in the detection of OPs in real sample (the absorbance spectra and photographs of GB, GD or paraoxon-spiked sample detection were listed from Figs. S9–S12 in supplementary data).
We chose apple as the test fruit sample to verify the feasibility of this AuNPs-based sensing system in ultra-sensitive detection of OPs residues in agricultural products, and because the apple possesses various constituents including cellulose, sugars, vitamins, organic acids, minerals, polyphenols, and flavones. It is shown that the VX-spiked sample generates obvious color change in comparison with the non-spiked one (see Fig. S9 in supplementary data). The standard regression equations for various OPs (GB, GD, VX and paraoxon) in apple matrix are shown in Table 1. The concentration of OPs residues in the spiked apples are calculated based on the standard curves constructed in apple juice matrix as listed in Table 2. The values are close to the added amount, which demonstrate the method is reliable, practical, sensitive and simple when employing it in the detection of OPs in real sample (the absorbance spectra and photographs of GB, GD or paraoxon-spiked sample detection were listed from Figs. S9–S12 in supplementary data).
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