A dual-signal sensing strategy based on ratiometric fluorescence and colorimetry for determination of Cu2+ and glyphosate

Interaction between glyphosate pesticide and amphiphilic peptides for colorimetric analysis

“…In the presence of the pesticide, a morphological change from a cylindrical to a spherical micellar system was observed for 1, which could explain the large change in the behaviour of the enthalpogram when compared to the lipopeptide with two aliphatic tails. The kinetic data showed that both systems undergo inhibition processes, and LOD values compatible with other values in the literature [19][20][21][22][23] were determined (Table 4). An interesting result is that the hydrophobicity of the system inuences the LOD value.…”

“…Many methodologies have been used in the literature, such as HPLC, 13 capillary electrophoreses, 14 mass spectrometry, 15 uorescence spectroscopy, 16 cyclic voltammetry, 17 amperometry, 18 and coulometry. [19][20][21][22] Among these, colorimetric sensors are interesting because they have easy operation, visual quantication, and low sample volume. 20,23 Recently, many groups have developed colorimetric response materials with high sensitivity for PNG detection and high specicity.…”

“…20,23 Recently, many groups have developed colorimetric response materials with high sensitivity for PNG detection and high specicity. [19][20][21][22] The most convenient and sophisticated technological tools able to perform fast, simple, low-cost, specic, and highly sensitive detection are biosensors. 24,25 These analytical devices incorporate a biological component capable of specically recognizing targets and producing a measurable signal related to the analyte concentration.…”

Fluorescent Immunoassay with a Copper Polymer as the Signal Label for Catalytic Oxidation of O-Phenylenediamine

“…Cu 2+ can catalyze the oxidation of OPD to produce a yellow fluorescent product OPDox. Coordination of Cu 2+ by some ligands such as quinolone, pyrophosphate, glyphosate, bleomycin, penicillamine and EDTA can inhibit the reaction between Cu 2+ and OPD [30][31][32][33][34][35]. For this consideration, we investigated the reaction between the peptide-Cu 2+ complexes and OPD.…”

A label-free dual-modal aptasensor for colorimetric and fluorescent detection of sulfadiazine

“…Furthermore, the detection results based on traditional single-modal response (colorimetric, fluorescent or electrochemical signals) are also susceptible to environmental, instrumental, and operational influences. 26 In contrast, this sensor based on dual-modal response can provide more reliable results on account of two independent readout signals. 27 In recent years, to rapid and accurate detect the analytes dual-modal aptasensors have been fabricated by combining the visualization of colorimetric signals with the high sensitivity of fluorescence signals.…”