A Rapid and Sensitive Colorimetric Sensor for Detection of Silver Ions Based on the Non-aggregation of Gold Nanoparticles in the Presence of Ascorbic Acid

SERS Nanosensor for the Detection of Ag(I) Ions under High-Chloride Environment: Breaking Chloride Masking Effect

“…Chemical sensors have the advantages of rapid response, high sensitivity, and on-site detection . Various chemical sensors for the detection of Ag + ions have been developed, including electrochemical sensors, − fluorescent sensors, − and colorimetric sensors. − However, these sensors usually can detect only free Ag + ions and cannot work when the common chloride (Cl – ions) is present in the samples. The reason is that the free Ag + can react with the Cl – ions to form soluble AgCl x 1– x ( x > 1) complexes , and hinder the response of the Ag + ion sensor (namely, chloride masking effect). − Until now, no chemical sensors have been available for the detection of Ag­(I) ions under a chloride environment (for more details, see Table S1).…”

Carbon-dot-triggered aggregation/dispersion of gold nanoparticles for colorimetric detection of nucleic acids and its application in visualization of loop-mediated isothermal amplification

“…19,20 Aggregation-based colorimetric assays involving AuNPs are typically linked to the process of switching between the dispersion and aggregation states, which is triggered by particular intermolecular interactions between the target and surface modiers. [21][22][23] However, a variety of physiological factors, such as pH, ionic strength, and temperature also contribute to AuNPs aggregation, thereby resulting in poor selectivity. 24 Colorimetric read-out resulting from AuNPs redispersion could greatly improve the selectivity and reduce the chances of false positive results.…”

“…24 Colorimetric read-out resulting from AuNPs re-dispersion could greatly improve the selectivity and reduce the chances of false positive results. 23 Zhang et al established a colorimetric assay for DNA by utilizing SYBR Green/AuNPs aggregates. 25 CDs are composed of a multitude of functional groups, including amino and carboxyl groups that are capable of binding to specific analytes.…”

Long-Term Stability Monitoring of Printed Proteins on Paper-Based Membranes

“…As alternatives to these high technology sensing platforms, colorimetric and immunosensors are still popular in clinical use. 17−19 These immunosensors are based on immobilized capturing antibodies, and virus particles/antigens captured on antibodies were detected by detection antibodies. 20,21 Colorimetric/immunosensing platforms are widely used in various viruses, antigens, and pollutant detection systems; however, most of the studies of these paper-based sensors focus on detection sensitivity and not stability or storage conditions.…”

“…Detection and sensing of viruses, pollutants, and other related proteins have received much attention with the Zika and MERS outbursts in recent years. − To be considered a good detection and sensing platform, stability and detection sensitivity as well as ease of use and maintenance should be guaranteed. , There are several careful studies of paper-based sensing membranes that provide a cheap and convenient option for virus/pollutant detection. − To date, a large number of novel paper-based sensing technologies, including nanoparticle-based and electronic-based sensors, have been developed to increase detection sensitivity. − However, many of these technologies require a significant amount of detection time, function only under certain storage conditions and are quite often expensive. As alternatives to these high technology sensing platforms, colorimetric and immunosensors are still popular in clinical use. − These immunosensors are based on immobilized capturing antibodies, and virus particles/antigens captured on antibodies were detected by detection antibodies. , Colorimetric/immunosensing platforms are widely used in various viruses, antigens, and pollutant detection systems; however, most of the studies of these paper-based sensors focus on detection sensitivity and not stability or storage conditions. − In addition, a large number of paper-based sensing membrane systems have adopted chemically treated membranes to enhance protein/antibody adsorption and stability, − but comparative studies of protein stability and detection sensitivity on different paper-based membranes are rare. To verify the stability of printed proteins on paper-based membranes and to fill the gaps in research, we conducted systematic studies of protein stability and sensitivity on three different paper-based membranes.…”