Spot tests: past and present

Doménech‐Carbó, María Teresa; Doménech‐Carbó, Antonio

doi:10.1007/s40828-021-00152-z

Cited by 9 publications

(3 citation statements)

References 222 publications

(354 reference statements)

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“…"Bronze disease" is the most serious one in many copperbased alloys, caused by cyclic reactions of nantokite with the internal and external bronzes under the influence of oxygen and water [13]. Generally, the visual effect of bronze disease is the formation of pale green, powdery spots and is also accompanied by the stress cracking of the surface due to the morphology change and subsequent deeper penetration of nantokite into the bronzes [16]. Nevertheless, this process is not still so advanced in the samples investigated.…”

Section: Resultsmentioning

confidence: 99%

Metallurgical technology of coins from Samshvilde fortress (South Georgia, Caucasus)

Rovella,

Ricca,

Berikashvili

et al. 2023

Proceedings of the 2022 IMEKO TC4 International Conference on Metrology for Archaeology and Cultural Heritage

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Samshvilde represents one of the most representative Georgian archaeological sites thanks to its complex history that began in the Neolithic times and ended in the 18th cent. The area has been always considered an important crossroads for its geographical position, and, for this, rich in different kinds of artefacts from pottery, obsidian objects, bronze coins to other furnishings. This variety testifies to the progress of the different civilizations over time in terms of culture, lifestyle, and technological skills. In the paper, two bronze coins were investigated to determine the main technological process used in the area during the Medieval Age and to increase the knowledge of metallurgical manufacture in the South Caucasus region that is still partly to be discovered.

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Section: Resultsmentioning

confidence: 99%

Metallurgical technology of coins from Samshvilde fortress (South Georgia, Caucasus)

Rovella,

Ricca,

Berikashvili

et al. 2023

Proceedings of the 2022 IMEKO TC4 International Conference on Metrology for Archaeology and Cultural Heritage

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“…One method is to separate the samples using thin-layer chromatography (TLC), a chromatographic technique used to separate nonvolatile mixtures, and then measure the samples using SERS analysis. Usually, a sheet of glass, plastic, or aluminum foil is commonly used in TLC, which is coated with a thin layer of an adsorbent substance, i.e., typically gold nanostars, aluminum oxide (alumina), or cellulose . The sample can then be simply transported for additional analysis for the qualitative measurement of pollutants.…”

Section: Comparative Analysis Of Pesticide Detection Technologies In ...mentioning

confidence: 99%

Raman Spectroscopy-Based Chemometrics for Pesticide Residue Detection: Current Approaches and Future Challenges

Sharma,

Kolašinac,

Jiang

et al. 2024

ACS Agric. Sci. Technol.

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Inappropriate pesticide usage leads to unsustainable agricultural practices and deteriorates the quality of fruits and vegetables by introducing potentially hazardous substances. Raman spectroscopy, specifically surface-enhanced Raman spectroscopy (SERS), offers high-sensitivity in situ monitoring of pesticide residues. This review emphasizes the importance of advanced databases and algorithms in interpreting Raman signals. Various statistical models are introduced for spectral analysis, including self-modeling curve resolution, multivariate curve resolution, and self-modeling mixture analysis. Additionally, this study provides comprehensive information on different SERS substrates and shows great potential in the determination of food pesticide residues. However, a multicomponent analysis is needed for pesticide mixtures. The overlapping of the bands needs to be considered due to the complex matrices of biological samples. Artificial neural networks (ANNs) are applied as nonlinear models when the analytes are in a multicomponent mixture. Further research is needed to establish standardized protocols for SERS-based pesticide quantitative detection, including sample preparation and data analysis.

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“…The development of a simple colorimetric assay is at the forefront of (bio)analysis as a result of its outstanding merits for point of care and spot-testing for real-time sensing with simplified procedures, and the reduced time and cost of the analyses [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Sensing of Catecholamine in Human Urine Using a Simple Colorimetric Assay Based on Direct Melanochrome and Indolequinone Formation

Lettieri

Spinelli

Caponi

et al. 2023

Sensors

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We used the first enzyme-free synthesis and stabilization of soluble melanochrome (MC) and 5,6-indolequinone (IQ) derived from levodopa (LD), dopamine (DA), and norepinephrine (NE) oxidation to develop a simple colorimetric assay for catecholamine detection in human urine, also elucidating the time-dependent formation and molecular weight of MC and IQ using UV–Vis spectroscopy and mass spectrometry. The quantitative detection of LD and DA was achieved in human urine using MC as a selective colorimetric reporter to demonstrate the potential assay applicability in a matrix of interest in therapeutic drug monitoring (TDM) and in clinical chemistry. The assay showed a linear dynamic range between 5.0 mg L−1 and 50.0 mg L−1, covering the concentration range of DA and LD found in urine samples from, e.g., Parkinson’s patients undergoing LD-based pharmacological therapy. The data reproducibility in the real matrix was very good within this concentration range (RSDav% 3.7% and 6.1% for DA and LD, respectively), also showing very good analytical performances with the limits of detection of 3.69 ± 0.17 mg L−1 and 2.51 ± 0.08 mg L−1 for DA and LD, respectively, thus paving the way for the effective and non-invasive monitoring of dopamine and levodopa in urine from patients during TDM in Parkinson’s disease.

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Spot tests: past and present

Cited by 9 publications

References 222 publications

Metallurgical technology of coins from Samshvilde fortress (South Georgia, Caucasus)

Metallurgical technology of coins from Samshvilde fortress (South Georgia, Caucasus)

Raman Spectroscopy-Based Chemometrics for Pesticide Residue Detection: Current Approaches and Future Challenges

Sensing of Catecholamine in Human Urine Using a Simple Colorimetric Assay Based on Direct Melanochrome and Indolequinone Formation

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