Silver nanoparticles for melamine detection in milk based on transmitted light intensity

Ramalingam, Kaarthika; Thiyagarajan, Devasena; Senthil, B.; Kalpana, R.; Jayavel, R.

doi:10.1049/iet-smt.2016.0215

Cited by 16 publications

(3 citation statements)

References 17 publications

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“…The nanoparticles exhibited a surface plasmon band at 404 nm (see Figure 2F), which is consistent with previous studies showing that AgNPs with a size of 15-20 nm absorb in the range of 401-406 nm [82]. The interaction between the dipeptide and AgNPs caused aggregation by decreasing the distance between the particles, resulting in a shift and broadening of the AgNP plasmon resonance to longer wavelengths (565 nm) [83]. The UV-Vis spectra of phosphonate dipeptides of Leu do not differ because they are characteristic of the colloid (uncharged amino acid solutions of Ala, Asn, Ile, Leu, Met, Pro, Ser, Thr, and Val show negligible absorption in this region) [84], so an example spectrum for Leu1-AgNPs system is provided in Figure 2F.…”

Section: Surface Analysis Of Npssupporting

confidence: 90%

Gold and Silver Nanoparticles as Biosensors: Characterization of Surface and Changes in the Adsorption of Leucine Dipeptide under the Influence of Substituent Changes

Proniewicz

2024

IJMS

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Early detection of diseases can increase the chances of successful treatment and survival. Therefore, it is necessary to develop a method for detecting or sensing biomolecules that cause trouble in living organisms. Disease sensors should possess specific properties, such as selectivity, reproducibility, stability, sensitivity, and morphology, for their routine application in medical diagnosis and treatment. This work focuses on biosensors in the form of surface-functionalized gold (AuNPs) and silver nanoparticles (AgNPs) prepared using a less-time-consuming, inexpensive, and efficient synthesis route. This allows for the production of highly pure and stable (non-aggregating without stabilizers) nanoparticles with a well-defined spherical shape, a desired diameter, and a monodisperse distribution in an aqueous environment, as confirmed by transmission electron microscopy with energy-dispersive X-ray spectroscopy (TEM-EDS), X-ray diffraction (XRD), photoelectron spectroscopy (XPS), ultraviolet-visible (UV-VIS) spectroscopy, and dynamic light scattering (DLS). Thus, these nanoparticles can be used routinely as biomarker sensors and drug-delivery platforms for precision medicine treatment. The NPs’ surface was coated with phosphonate dipeptides of L-leucine (Leu; l-Leu–C(R1)(R2)PO3H2), and their adsorption was monitored using SERS. Reproducible spectra were analyzed to determine the orientation of the dipeptides (coating layers) on the nanoparticles’ surface. The appropriate R2 side chain of the dipeptide can be selected to control the arrangement of these dipeptides. This allows for the proper formation of a layer covering the nanoparticles while also simultaneously interacting with the surrounding biological environment, such as cells, tissues, and biological fluids.

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Section: Surface Analysis Of Npssupporting

confidence: 90%

Gold and Silver Nanoparticles as Biosensors: Characterization of Surface and Changes in the Adsorption of Leucine Dipeptide under the Influence of Substituent Changes

Proniewicz

2024

IJMS

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“…The prepared AgTNPs were well dispersed in aqueous solution. When MA was added into the AgTNPs solution, the strong interactions between the AgTNPs and exocyclic amino groups of MA induced AgTNPs aggregation, which changed the color of the solution from purple to blue . However, in the presence of DA, the amine group and hydroxyl group of DA cross‐linked together with MA via hydrogen bonding, and the color of solution reverted to its original color .…”

Section: Resultsmentioning

confidence: 99%

Colorimetric Probe Coupled to Dispersive Liquid–Liquid Microextraction for Determination of Dopamine in Serum

Tai

Zhu

Yuan

et al. 2020

Bulletin Korean Chem Soc

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In this work, a highly sensitive method using a colorimetric probe coupled to dispersive liquid–liquid microextraction (DLLME) was developed for the quantitative determination of dopamine (DA) in serum. The DA in serum was concentrated by DLLME to increase the detection sensitivity and reduce the matrix effects. After the DLLME process, a colorimetric probe of silver triangular nanoparticles (AgTNPs) was used to detect DA, which was based on the plasma transformation of AgTNPs caused by strong interactions with melamine (MA). The results showed that DA could inhibit the aggregation of AgTNPs induced by MA, resulting in the recovery of the surface plasmon resonance (SPR) peak of AgTNPs. Thus, the DLLME method followed by colorimetric probe detection of DA can be achieved. The parameters affecting the proposed method were optimized, under the optimal conditions, a linear calibration curve was obtained over a concentration range of 5 to 250 nM with a recovery from 94.4 to 101.3%. The detection limit was 1.6 nM (at an S/N ratio of 3). The present method was successfully applied to determine DA in human serum.

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“…Citric acid can act as a reducing agent and stabilizer for AgNPs. This synthesis procedure results in a stable suspension of AgNPs for several hours under ambient conditions (23-25 °C) or days (at 4 °C), so long as it is protected from light [9] and resulting in a pale yellow solution [47].…”

Section: Modification Of Agnps With Citratementioning

confidence: 99%

Strategies in Improving Sensitivity of Colorimetry Sensor Based on Silver Nanoparticles in Chemical and Biological Samples

et al. 2022

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Colorimetric sensors-based silver nanoparticles (AgNPs) are very interesting to be studied and developed because of the simplicity and ease in the principle of detection. It does not require sophisticated and affordable tools but still has high sensitivity. The coefficient extinction of AgNPs is relatively higher than AuNPs of the same size, making the sensitivity of AgNPs higher than AuNPs. The principle of detection is based on the aggregation of nanoparticles with analytes that causes shifting in Localized Surface Plasmon Resonance (LSPR) to a larger wavelength, commonly called a bathochromic shift or redshift. It is a favorite phenomenon because it is more easily observed with naked eyes. This sensor shows a good analytic performance with high sensitivity due to strong LSPR and good strategies that selectively bring interaction between analytes and AgNPs. AgNPs are characterized using UV-Visible (Ultra Violet-Visible), TEM (Transmission Electron Microscope), FTIR (Fourier Transform Infrared), and DLS (Dynamic Light Scattering), and many analytes have been detected with this sensor successfully. This article discusses several important parameters in increasing the sensitivity of AgNPs colorimetric sensors. Finally, it can be used as guidelines in the development of methods in the future.

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Silver nanoparticles for melamine detection in milk based on transmitted light intensity

Cited by 16 publications

References 17 publications

Gold and Silver Nanoparticles as Biosensors: Characterization of Surface and Changes in the Adsorption of Leucine Dipeptide under the Influence of Substituent Changes

Gold and Silver Nanoparticles as Biosensors: Characterization of Surface and Changes in the Adsorption of Leucine Dipeptide under the Influence of Substituent Changes

Colorimetric Probe Coupled to Dispersive Liquid–Liquid Microextraction for Determination of Dopamine in Serum

Strategies in Improving Sensitivity of Colorimetry Sensor Based on Silver Nanoparticles in Chemical and Biological Samples

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