Ultrasensitive label-free immunochromatographic strip sensor for Salmonella determination based on salt-induced aggregated gold nanoparticles

Overview of Rapid Detection Methods for Salmonella in Foods: Progress and Challenges

“…Based on the van der Waals forces of Salmonella on agglomerated Au NPs, Ren et al realized the label-free sensitive determination of Salmonella by the naked eye through an immunochromatographic strip. The visual LOD of 10 3 CFU/mL based on salt-induced aggregated Au NPs in the developed immunochromatographic strip was 100-fold lower than the method based on cationic AuNPs, and the test strip also exhibited an excellent recovery in cabbage and other food samples [58]. In addition to Au NPs, many kinds of nanomaterials with conspicuous colors make a great contribution to the colorimetric detection of Salmonella [59] The other colorimetric method is an enzymatic or enzyme-like catalytic reaction based on ELISA, and the chromogenic substrate used is generally tetramethylbenzidine (TMB).…”

Rapid and selective detection of aluminum ion using 1,2,3-triazole-4,5-dicarboxylic acid-functionalized gold nanoparticle-based colorimetric sensor

“…Taking advantages of unique surface plasmon resonance (SPR) absorption, easy surface functionalization and variable solution colors, AuNPs have been used for colorimetric sensing in food security, environmental monitoring, and health care. [8][9][10][11] Potential applications include the determination of metal ions, [12][13][14][15][16][17][18] pesticide residues, 19,20 bisphenol A (BPA), 21,22 phosphate, 23 azodicarbonamide (ADA), 24 antibiotics, [25][26][27] adenosine and nucleic acids, [28][29][30] dopamine, 31 bacteria, 32,33 and virus. 34,35 In recent years, rapid detection of Al 3+ using AuNPs as a colorimetric sensor have been reported, in which the AuNPs' surface were functionalized by different Al 3+ recognition ligands, such as diaminodiphenyl sulfone, 36 ascorbic acid, 37 11mercaptoundecanoic acid, 38 5-mercaptomethyltetrazole, 39 poly(acrylic acid), 40 triazole ether, 41 catechol, 42 and xylenol orange.…”

“…Taking advantages of unique surface plasmon resonance (SPR) absorption, easy surface functionalization and variable solution colors, AuNPs have been used for colorimetric sensing in food security, environmental monitoring, and health care. 8–11 Potential applications include the determination of metal ions, 12–18 pesticide residues, 19,20 bisphenol A (BPA), 21,22 phosphate, 23 azodicarbonamide (ADA), 24 antibiotics, 25–27 adenosine and nucleic acids, 28–30 dopamine, 31 bacteria, 32,33 and virus. 34,35 …”

Multifunctional polyethyleneimine for synthesis of core-shell nanostructures and electrochemiluminescent detection of three AMI biomarkers

“…This strategy involved the capture antibody (Ab)-coated magnetic beads and the luminophore-labeled detection Ab to form a sandwich-type complex with the target antigen (Ag), which is quite complicated and expensive. By contrast, in label-free-based methods [8][9][10][11], only one antibody was involved, which is simple but lack of sensitivity. Hence, nanomaterials were commonly selected to amplify ECL signals [2,12].…”