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Journal articles on the topic 'Colorimetric analysis'

Author: Grafiati

Published: 4 June 2021

Last updated: 30 July 2024

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1

Xu, Ning, Shuang Jin, and Li Wang. "Metal nanoparticles-based nanoplatforms for colorimetric sensing: A review." Reviews in Analytical Chemistry 40, no. 1 (January 1, 2020): 1–11. http://dx.doi.org/10.1515/revac-2021-0122.

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Abstract With the progress of analysis technology and nanotechnology, colorimetric detection has become one of the research hotspots in the field of analytical chemistry. Compared with traditional detection methods, the colorimetric method has many advantages, such as high sensitivity, good selectivity, convenience and fast, as well as low cost. In recent years, metal nanoparticles have been introduced into colorimetry, making the research and application of colorimetry develop rapidly. In this work, we summarize the usual colorimetric detection methods based on metal nanoparticles-based nanozymes and their applications in the last five years. We hope that this work will help readers understand the mechanism and practical application value of nanozyme-based colorimetric biosensors. Meanwhile, this work may give some hints and references for future colorimetric detection research to promote the application and development of nanozyme-based colorimetry in biomedical and environmental analysis.

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Yefymenko, Serhii, Ihor Hryhorenko, Iurii Khoroshailo, and Svitlana Hryhorenko. "Applying covariance analysis to determine the factor influence on the control parameter in colorimetric study." Ukrainian Metrological Journal, no. 3 (September 30, 2022): 49–55. http://dx.doi.org/10.24027/2306-7039.3.2022.269783.

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The paper considers solutions to a scientific and practical problem of applying covariance analysis to determine the factor influence on the functional transformation of the control parameter in colorimetric study. The study implies determining the factor influence on the additive and multiplicative components of the measurement error of the colorimetric control parameter to assess the validity of conclusions about the factor influence on the transformation of the control parameter. The limitations on the number of basic levels (control parameters) and the factors influencing the result of colorimetric control are determined. During the study, the equations to assess the validity of statistical conclusions about the informational significance of the colorimetric control indicators for a simplified model of cross-classification were obtained. The need for the study is due to the fact that in colorimetric control of cereal grains, the measurement uncertainty of the results of measuring the values of the controlled indicators at given levels of the control parameter is quite high. In modern industry, colorimetry has a number of advantages over other methods, such as weight analysis. Colorimetric determinations are performed much faster. In the case of weight analysis, the chemical reaction is at the beginning of the determination followed by a series of long operations, while in the case of colorimetry, the colors are compared immediately after the chemical reaction. Therefore, the colorimetric method belongs to the methods of express control. The main task of colorimetric express control (in our case) is to determine the quality of cereal grains. The task is important and relevant because grain, namely flour, is the main ingredient of many foods, e.g. bread, pasta, pastries, and cookies. Quality products can be obtained only from quality raw materials. Thus, at present time, it is relevant to determine the quality of cereal grains, and flour as the derived product, in Ukraine.

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AMELIN, VASILY G., SHOGAH ZEN ALABDEN CHALAWI, and DMITRY S. BOLSHAKOV. "IDENTIFICATION AND AUTHENTICATION OF COW’S MILK POWDER USING A SMARTPHONE AND CHEMOMETRIC ANALYSIS." Lomonosov chemistry journal 64, no. 1, 2023 (June 1, 2023): 49–59. http://dx.doi.org/10.55959/msu0579-9384-2-2023-64-1-49-59.

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The possibility of identi cation and authentication of cow’s milk powder by the method of chemical colorimetry of the samples’ own uorescence using a smartphone camera and chemometric analysis is shown. A fundamental test device for direct colorimetric analysis of powdered milk is proposed, excluding the stage of sample preparation. Fluorescence excitation was carried out with a portable source of monochromatic UV radiation (λ = 365 nm). Colorimetric parameters of powdered milk uorescence in RGB space were recorded using a smartphone camera. We used chemometric processing of the calculated analytical signal, which made it possible to reduce the analysis time and visualize the study data. The evaluation of the data array of uorescence colorimetric parameters (RGB) was carried out by principal component analysis (PCA) and hierarchical clustering analysis (HCA) using the XLSTAT software.

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4

Vucāne, Sanita, Ingmars Cinkmanis, and Mārtiņš Šabovics. "Colorimetric Measurements of Vegetable Oils by Smartphone-Based Image Analysis." Proceedings of the Latvian Academy of Sciences. Section B. Natural, Exact, and Applied Sciences. 76, no. 1 (February 1, 2022): 110–15. http://dx.doi.org/10.2478/prolas-2022-0017.

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Abstract One of the most important indicators of quality of vegetable oils is colour, which can be detected with colorimetric measurements. The determination of colour is traditionally done using colorimeters, spectrometers, tintometers, and other analytical equipment. As an alternative to replace the classical analytical methods, smartphone-based colorimetry using digital image analysis can be used. For colorimetric detection of colour in vegetable oils, a Huawei P30 lite smartphone and android application “Colour Picker” with an image matching algorithm RGB model was used. The image of sample and standard solutions was captured in a polyvinyl chloride box with light-emitting diode (LED) lamps. The aim of the study was to detect the colour of vegetable oils with smartphone-based image analysis. The detected colour of eleven vegetable oils (sea buckthorn, sunflower, rice, macadamia nut, hemp, corn, grape, linseed, rapeseed, olive, and milk thistle oils) was compared with standard solutions of iodine with a concentration range from 0 to 100 mg·100 ml−1. The results show that smartphone-based colorimetry can be used for detection of the colour of vegetable oils and it is possible to compare the colour with standard solutions of iodine. The colour of vegetable oils was expressed as the colour number obtained from an iodine standard solution prepared in deionised water.

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Majdinasab, Marjan, Sondes Ben Aissa, and Jean Louis Marty. "Advances in Colorimetric Strategies for Mycotoxins Detection: Toward Rapid Industrial Monitoring." Toxins 13, no. 1 (December 24, 2020): 13. http://dx.doi.org/10.3390/toxins13010013.

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Mycotoxins contamination is a global public health concern. Therefore, highly sensitive and selective techniques are needed for their on-site monitoring. Several approaches are conceivable for mycotoxins analysis, among which colorimetric methods are the most attractive for commercialization purposes thanks to their visual read-out, easy operation, cost-effectiveness, and rapid response. This review covers the latest achievements in the last five years for the development of colorimetric methods specific to mycotoxins analysis, with a particular emphasis on their potential for large-scale applications in food industries. Gathering all types of (bio)receptors, main colorimetric methods are critically discussed, including enzyme-linked assays, lateral flow-assays, microfluidic devices, and homogenous in-solution strategies. This special focus on colorimetry as a versatile transduction method for mycotoxins analysis is comprehensively reviewed for the first time.

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6

Yefymenko, Serhii, Ihor Hryhorenko, and Svitlana Hryhorenko. "Dispersion analysis in colorimetric control." Ukrainian Metrological Journal, no. 2 (July 5, 2023): 28–32. http://dx.doi.org/10.24027/2306-7039.2.2023.286715.

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In the paper, solutions to the scientific and practical task of applying covariance analysis to determine the factor influence on the functional transformation of the control parameter in colorimetric research are considered. The research involves determining the factor influence on the additive and multiplicative components of the measurement error of the colorimetric control parameter to assess the reliability of conclusions about the factor influence on the transformation of the control parameter. Limits on the amount of the main level (control parameter) and factors affecting the result of colorimetric control are determined. During the study, the equations to assess the reliability of statistical conclusions about the informational significance of indicators of colorimetric control for a simplified model of cross-classification were obtained. The need to carry out the research is related to the fact that during colorimetric control of grain crops, the uncertainty of the measurement results of the values of the controlled indicators is large enough, and so it must be evaluated. However, the proposed approach is not limited to a few colorimetric controls, but can be extended to a wider range of problems, where it is necessary to consider the factor influence with further ranking of factors by levels of significance.

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7

Dyaninggar, Pratyangga Surya, Sri Juari Santosa, and Bambang Rusdiarso. "Preliminary Research on the Analysis of Chromium(III) Based on Digital Image Processing Method Utilizing Gold Nanoparticles as Colorimetric Sensor." Nano Hybrids and Composites 37 (August 31, 2022): 15–22. http://dx.doi.org/10.4028/p-t3ga7q.

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Gold nanoparticles (AuNPs) have been successfully synthesized using L-Ascorbic Acid as a reducing agent and p-Aminobenzoic Acid as a capping agent. These AuNPs were used to detect and quantify Chromium(III) as a pollutant utilizing its unique characteristic called surface plasmon resonance (SPR). The change of SPR and color of AuNPs then was employed to determine the concentration of Cr(III) by using colorimetric and Digital Image Colorimetric methods. Digital Image Colorimetry allowed to development of an easier and cheaper way to detect and quantify Cr(III). AuNPs capped p-aminobenzoic acid (AuNPs-PABA) were synthesized at room temperature without using any heating method. Then synthesized AuNPs-PABA were characterized using UV-Visible spectrometer and Transmission Electron Microscope. This AuNPs-PABA then got contacted to Cr(III) and color-changing happened in AuNPs-PABA was analyzed using UV-Vis Spectrometer and captured for Digital Image Colorimetric. The result showed that Digital Image Colorimetric method has a very big potential to be developed for AuNPs-based detection and quantification of Cr(III) as confirmed by good linearity of AuNPs-PABA-Cr(III) respect with Difference Intensity of Red Color Component, wider dynamic range, and Lower Limit of Detection (LoD).

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Smykalova, I., O. Grillo, M. Bjelkova, M. Hybl, and G. Venora. "Morpho-colorimetric traits of Pisum seeds measured by an image analysis system." Seed Science and Technology 39, no. 3 (October 1, 2011): 612–26. http://dx.doi.org/10.15258/sst.2011.39.3.08.

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9

Zhbanova, Vera L. "Features Of Digital Colourimetry Application in Modern Scientific Research." Issue 03-2021, no. 03-2021 (June 2021): 146–58. http://dx.doi.org/10.33383/2021-028.

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The paper is devoted to digital colorimetry, has a character of review, and deals with the main issues of colorimetric calculations and transformations during digital colour registration. The presented materials are intended to help researchers already at the stage of registration to exclude colour losses and, accordingly, errors of measurements, taking into account the following features: – The connection of colorimetric measurements with digital circuit design is shown, which results in digital colorimetry as a tool for acquiring and processing accurate colour information about the object of study; – Important issues such as: selection criteria for parameters of photodetector arrays, colour separation systems, working colour spaces, formats of colour images, and post-processing methods for colour information of images; – Colour separation systems of photodetector arrays, their advantages and disadvantages, influence on the registration result and prospects of new developments in this field are described; – Working colour spaces of digital recording systems, and also colour systems are considered allowing maximum saving colour parameters of digital impression; – To understand human colour perception, the problem of hardware-independent reproduction of colour and images after image registration is considered; – It is proposed to use such colorimetric systems in the analysis of colour parameters in scientific studies, which give understanding of human image perception in the analysis of image quality. The paper gives a broad overview of the digital colorimetry main aspects and researches on this topic for specialists who use digital colour recorders as a tool in their experimental research. This material can also be useful for specialists with deep knowledge in colorimetry who use digital colour recorders as part of their main tasks in the definite field of science and technology.

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Layne, Tiffany R., Anchi Scott, Larissa L. Cunha, Rachelle Turiello, and James P. Landers. "Three-Dimensional-Printed Instrument for Isothermal Nucleic Acid Amplification with Real-Time Colorimetric Imaging." Micromachines 15, no. 2 (February 14, 2024): 271. http://dx.doi.org/10.3390/mi15020271.

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Isothermal amplification methods have become popular in research due to the simplicity of the technology needed to run the reactions. Specifically, loop-mediated isothermal amplification (LAMP) has been widely used for various applications since first reported in 2000. LAMP reactions are commonly monitored with the use of colorimetry. Although color changes associated with positive amplification are apparent to the naked eye, this detection method is subjective due to inherent differences in visual perception from person to person. The objectivity of the colorimetric detection method may be improved by programmed image capture over time with simultaneous heating. As such, the development of a novel, one-step, automated, and integrated analysis system capable of performing these tasks in parallel is detailed herein. The device is adaptable to multiple colorimetric dyes, cost-effective, 3D-printed for single-temperature convective heating, and features an easy-to-use LabVIEW software program developed for automated image analysis. The device was optimized and subsequently validated using four messenger-RNA targets and mock forensic samples. The performance of our device was determined to be comparable to that of a conventional thermal cycler and smartphone image analysis, respectively. Moreover, the outlined system is capable of objective colorimetric analysis, with exceptional throughput of up to 96 samples at once.

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11

Lee, Sung-Hak. "Colorimetric Analysis Using Scene-Adaptive Color Conversion Matrix of Calibrated CIS." Journal of Sensors 2016 (2016): 1–7. http://dx.doi.org/10.1155/2016/6731572.

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TheRGBsignals of different CISs (color image sensors) do not register the same values for the same viewing scene owing to their different spectral sensitivity and white balance mechanisms. Thus, CISs must be characterized based on CIE standard observation for colorimetric purposes. One general method for characterizing CISs is least square polynomial modeling to derive the colorimetric transfer matrix betweenRGBoutputs and CIEXYZtristimulus inputs. However, the transfer matrix that is obtained under the standard CIE illumination is unable to estimate various conditions of a CIS that is operated under various illuminations with varying chromaticity and luminance. Therefore, repeated experiments are necessary to obtain accurate colorimetric analysis results. This paper presents a scene-adaptive colorimetric analysis method using images captured by a general consumer camera under various environments.

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12

Guerreiro, Julio César, Ana Paula Azevedo, Evandro Pereira Prado, Vanda Pietrowski, Rudiney Ringenberg, Cristiane Mengue Feniman Moritz, Thais Carneiro Ghiotto, Thaíse Milena Pascutti, and Pedro José Ferreira-Filho. "CASSAVA ROOTS DAMAGED BY MIGDOLUS FRYANUS PRODUCE POOR QUALITY STARCH." REVISTA DE AGRICULTURA NEOTROPICAL 9, no. 2 (July 5, 2022): e6884. http://dx.doi.org/10.32404/rean.v9i2.6884.

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The aim of this study was to evaluate the quality of starch produced by plants that suffer damage caused by M. fryanus, analyzed by colorimetric and morphological indices. Colorimetric data were composed of luminosity indices, “a” and “b” chroma coordinates and darkening index. For morphological data, the perimeter and area of starch granules extracted from cassava roots were analyzed. The variables were summarized in a principal component analysis and the axes scores retained for interpretation were correlated with the damage caused by the M. fryanus. From these analyses and observing the main effects, linear regression models for the variables were determined, according to the level of damage caused by the pest. The damage caused by M. fryanus in the roots strongly influenced the indices related to starch colorimetry, hence, under conditions of greater damage, the tendency of the chroma coordinates to vary toward red and yellow was observed and a decrease in starch luminosity occurred, inversely proportional to the increase in darkening. Similar to what was observed in the colorimetric data, a drop in the size of starch granules was noted in the roots, which suffered greater damage from the pest.

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13

Jafari, R., S. H. Amirshahi, and S. A. Hosseini Ravandi. "Colorimetric analysis of black coated fabrics." Journal of Coatings Technology and Research 13, no. 5 (May 25, 2016): 871–82. http://dx.doi.org/10.1007/s11998-016-9790-8.

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14

Rouland, J. "Colorimetric analysis of the retinal pigmentation." Vision Research 35, no. 1 (October 1995): S224. http://dx.doi.org/10.1016/0042-6989(95)98862-4.

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15

Alberti, Giancarla, Camilla Zanoni, Lisa Rita Magnaghi, and Raffaela Biesuz. "Disposable and Low-Cost Colorimetric Sensors for Environmental Analysis." International Journal of Environmental Research and Public Health 17, no. 22 (November 11, 2020): 8331. http://dx.doi.org/10.3390/ijerph17228331.

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Environmental contamination affects human health and reduces the quality of life. Therefore, the monitoring of water and air quality is important, ensuring that all areas are acquiescent with the current legislation. Colorimetric sensors deliver quick, naked-eye detection, low-cost, and adequate determination of environmental analytes. In particular, disposable sensors are cheap and easy-to-use devices for single-shot measurements. Due to increasing requests for in situ analysis or resource-limited zones, disposable sensors’ development has increased. This review provides a brief insight into low-cost and disposable colorimetric sensors currently used for environmental analysis. The advantages and disadvantages of different colorimetric devices for environmental analysis are discussed.

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Lee, Seong-Hee, Soon-Ho Ha, and Gap-Chae Chung. "DIAGNOSIS OF NUTRITIONAL STATUS OF CUCUMBER PLANT BY RAPID BIOCHEMICAL TEST. XYLEM SAP ANALYSIS, AND COLORIMETRIC PETIOLE ANALYSIS." HortScience 27, no. 6 (June 1992): 615b—615. http://dx.doi.org/10.21273/hortsci.27.6.615b.

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In order to diagnose the nutritional disorders caused by various environmental stress, biochemical test, xylem sap analysis and colorimetric petiole analysis were used to assay symptoms well before the severe development. Among the various enzymatic analysis, alkaline phosphatase activity was highly specific to calcium deficiency while in vivo nitrate reductase activity was not stable parameter in response to nitrogen deficiency. Determination of nitrogen, phosphorus and magnesium by colorimetric petiole analysis was sensitive to induced deficiencies. The status of potassium in the plant, however, could be better determined with the xylem sap analysis. Salinity stress induced by low osmotic potential of the nutrient solution increased the activity of alkaline phosphatase, showing similar results as calcium deficiency. Magnesium and phosphorous contents by the colorimetric petiole analysis were particularly low when the roots in anoxia.

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Puasa, S. W., M. S. Ruzitah, and A. S. A. K. Sharifah. "Simplified Colorimetric Method Using Reactive Orange 16 for Analysis of Cationic Surfactant." Advanced Materials Research 701 (May 2013): 342–46. http://dx.doi.org/10.4028/www.scientific.net/amr.701.342.

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The concentration of surfactant is usually determined by a colorimetric method. A simplified colorimetric method for determining cationic surfactant was proposed which has advantages over the existing colorimetric method where less chemical is used and the overall time to perform the analysis per sample is reduced by half. These methods were tested based on analyzing the ionic interaction of cationic surfactant-reactive orange 16 (PBE-RO16) mixtures. A linear correlation was observed between the absorbance ratio of PBE-RO16 mixture/dye and PBE concentration. Results obtained from this study shows that the error between the two methods is only about ±20% except for PBE concentration less than 20 mg/L. Therefore, the proposed simplified colorimetric method can be considered as an alternative method for determination of cationic surfactant in aqueous solution in the future.

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Rinu Rana and Mahendra Singh Ashawat. "Quantitative Analysis of Phytoconstituents of Hydroalcoholic Extract of Carica Papaya Leaf." Journal of Advanced Zoology 44, S-5 (October 29, 2023): 1545–50. http://dx.doi.org/10.17762/jaz.v44is-5.1345.

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Carica papaya (C. papaya) leaves have been used in folk medicine for centuries. Several reports are available for use of Carica papaya leaves in increasing blood platelet count in dengue hemorrhagic fever. Recent studies also reported that Carica papaya leaves exhibits anti-tumor activity and immunomodulatory effects. Papaya leaf extract is reported to contain carbohydrates, amino acids, sterols, saponin glycosides, iridoids, flavonoids, phenolics, anthraquionones, triterpenes and alkaloids. The present investigation demonstrates the concentration of secondary metabolites in the hydroalcoholic extract of Carica papaya leaves. The total phenolics, total alkaloid and total flavonoid content were calculated by Folin–Ciocalteu colorimetric method, Bromocresol green colorimetric method and aluminum chloride colorimetric method respectively.

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Korzhan, L., S. Kulichenko, and S. Lelyushok. "Smart Colorimetric Determination of Ionic Surfactants with Bromothymol Blue at the Presence of Nonionic Surfactant Triton X-100." Methods and Objects of Chemical Analysis 18, no. 3 (2023): 136–42. http://dx.doi.org/10.17721/moca.2023.136-142.

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The application of digital colorimetry for the determination of ionic surfactants, moderately hydrophobic medicinal substances of ionic nature in the system with bromothymol blue (BTB) in aqueous solutions using a smartphone has been shown. The influence of the solution nonionic surfactant Triton X-100 (TX-100) on the parameters of the colorimetric determination of bromothymol blue has been studied. It was established that the addition of TX-100 improves the linearity of the graduation dependence of the colorimetric signal of bromothymol blue (r ˃ 0.99) and reduces the detection limit of the dye by 15 %. The optimal conditions for the colorimetric determination of the cationic surface-active substance cetylpyridinium chloride (CPC), reagent concentration, and pH were established (LOD = 2.5·10-6 mol L-1, Sr ˂ 2 %). The spike recovery method checked the trueness of the results obtained in the model solutions analysis. The procedure for determining CPC in the drug "Septolete Total" was verified by the addition technique. The ability of a nonionic surface-active substance to stabilize the colloidal chemical state of solutions of hydrophobic counterions associates was used for the colorimetric determination of the anionic surfactant sodium dodecyl sulfate (r = 0.99; LOD = 7.5·10-7 mol L-1) and the less hydrophobic indomethacin (LOD = 6.6·10-6 mol L-1) with the BTB-TX-100-CPC reagent system.

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Fair, Christopher, Wayne Boyles, Mandy Miller, Cas Knies, Lisa Allen, and Brenna Durkin. "COLORIMETRIC TOC ANALYSIS AS A SUBSTITUTE FOR COD ANALYSIS." Proceedings of the Water Environment Federation 2004, no. 9 (January 1, 2004): 523–33. http://dx.doi.org/10.2175/193864704784132544.

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Yoo, Woo Sik, Jung Gon Kim, Kitaek Kang, and Yeongsik Yoo. "Development of Static and Dynamic Colorimetric Analysis Techniques Using Image Sensors and Novel Image Processing Software for Chemical, Biological and Medical Applications." Technologies 11, no. 1 (January 28, 2023): 23. http://dx.doi.org/10.3390/technologies11010023.

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Colorimetric sensing techniques for point(s), linear and areal array(s) were developed using image sensors and novel image processing software for chemical, biological and medical applications. Monitoring and recording of colorimetric information on one or more specimens can be carried out by specially designed image processing software. The colorimetric information on real-time monitoring and recorded images or video clips can be analyzed for point(s), line(s) and area(s) of interest for manual and automatic data collection. Ex situ and in situ colorimetric data can be used as signals for process control, process optimization, safety and security alarms, and inputs for machine learning, including artificial intelligence. As an analytical example, video clips of chromatographic experiments using different colored inks on filter papers dipped in water and randomly blinking light-emitting-diode-based decorative lights were used. The colorimetric information on points, lines and areas, with different sizes from the video clips, were extracted and analyzed as a function of time. The video analysis results were both visualized as time-lapse images and RGB (red, green, blue) color/intensity graphs as a function of time. As a demonstration of the developed colorimetric analysis technique, the colorimetric information was expressed as static and time-series combinations of RGB intensity, HSV (hue, saturation and value) and CIE L*a*b* values. Both static and dynamic colorimetric analysis of photographs and/or video files from image sensors were successfully demonstrated using a novel image processing software.

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Bello, Thaísa B., Anderson G. Costa, Thainara R. da Silva, Juliana L. Paes, and Marcus V. M. de Oliveira. "Tomato quality based on colorimetric characteristics of digital images." Revista Brasileira de Engenharia Agrícola e Ambiental 24, no. 8 (August 2020): 567–72. http://dx.doi.org/10.1590/1807-1929/agriambi.v24n8p567-572.

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ABSTRACT Results of evaluations using optical evaluation methods may be correlated with tomato quality and maturation. In this context, the objective of this study was to evaluated the correlation between tomato colorimetric and physico-chemical variables, clustering them as a function of maturation stages, using multivariate analysis. The experiment was conducted using 150 fruits and three maturation stages (immature, light red and mature). The physico-chemical variables were evaluated through traditional methods. The colorimetric variables were assessed on images in RGB color model taken with a digital camera. The correlation between colorimetric and physico-chemical variables was analyzed using the Pearson’s coefficient. Principal components analysis and k-means clustering method was applied to three data set: RGB isolated variables; colorimetric variables calculated by relation between the RGB bands (colorimetric indexes); and physico-chemical variables. The colorimetric variables present higher explanatory capacity of the maturation variation than physico-chemical variables. The colorimetric indexes presented higher performance in clustering (accuracy of 0.98) tomatoes as a function of maturation.

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Kirillova, N. P., and T. M. Sileva. "Colorimetric analysis of soils using digital cameras." Moscow University Soil Science Bulletin 72, no. 1 (January 2017): 13–20. http://dx.doi.org/10.3103/s0147687417010045.

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Benoit, Nicole E., David Goldenberg, Shirley X. Deng, Eli Rosenbaum, Yoram Cohen, Joseph A. Califano, William H. Shackelford, Xiao B. Wang, and David Sidransky. "Colorimetric approach to high-throughput mutation analysis." BioTechniques 38, no. 4 (April 2005): 635–39. http://dx.doi.org/10.2144/05384pf01.

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Tihaček-Šojić, Ljiljana, Vladimir Milićević, and Marija Đurić-Srejić. "Crystallographic and Colorimetric Analysis of Dental Enamel." Dental Anthropology Journal 11, no. 2 (September 7, 2018): 5–11. http://dx.doi.org/10.26575/daj.v11i2.213.

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Tooth color and the correlation of the compostion of dental enamel with color were investigated in samples of teeth from two medieval Serb cemeteries. Differences in the composition of apatite crystals in the dental enamel of the two samples were found. Color ranges of teeth from the two samples differ in hues and chromas. This result suggests that enamel composition may have an influence on the color of teeth. The prevalence of chlorapatite in enamel causes tooth color to be closer to red and of higher chroma than teeth whose enamel consists of hydroxylapatite. No evidenc indicated that soil ingredients were incorporated into the dental enamel of either sample.

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Zhang, Chen, and Kenneth S. Suslick. "Colorimetric Sensor Array for Soft Drink Analysis." Journal of Agricultural and Food Chemistry 55, no. 2 (January 2007): 237–42. http://dx.doi.org/10.1021/jf0624695.

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Kirillova, N. P., D. B. Kemp, and Z. S. Artemyeva. "Colorimetric analysis of soil with flatbed scanners." European Journal of Soil Science 68, no. 4 (July 2017): 420–33. http://dx.doi.org/10.1111/ejss.12442.

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28

Privitera, Christian. "Digital colorimetric analysis of the Turin Shroud." MATEC Web of Conferences 36 (2015): 02002. http://dx.doi.org/10.1051/matecconf/20153602002.

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Thompson, Robert Q., Christopher Chu, Robin Gent, Alexandra P. Gould, Laura Rios, and Theresa M. Vertigan. "Visualizing Capsaicinoids: Colorimetric Analysis of Chili Peppers." Journal of Chemical Education 89, no. 5 (January 26, 2012): 610–12. http://dx.doi.org/10.1021/ed200258r.

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30

Rosenthal, Gerald A. "Radiochemical synthesis and colorimetric analysis of hydroxyguanidine." Bioorganic Chemistry 20, no. 1 (March 1992): 55–61. http://dx.doi.org/10.1016/0045-2068(92)90025-x.

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31

Marakaeva, Anastasia V., and Irina V. Kosyreva. "Express analysis of amoxicillin via colorimetric testing." Chemical Papers 74, no. 8 (February 7, 2020): 2381–88. http://dx.doi.org/10.1007/s11696-020-01085-6.

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32

Chan, Shu Ann, Jun-Seok Lee, and Young-Tae Chang. "Colorimetric Sensor Array for Qualitative Water Analysis." Australian Journal of Chemistry 62, no. 9 (2009): 1040. http://dx.doi.org/10.1071/ch09289.

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A chemosensor array comprising 45 off-the-shelf colorimetric dyes, dubbed the Singapore Tongue (SGT), that is capable of discriminating different brands of bottled water and waters of different geographical attribute is described. Twelve kinds of bottled waters were tested by the SGT, and changes of absorbance spectra were analyzed by unsupervised classification methods to validate the SGT system for water analysis. All 12 bottled waters were discriminated at 1 × concentration, and SGT could distinguish the identity of samples of the waters diluted up to 100 times, except distilled waters. Following the study of 63 tap waters in different mass rapid transit stations in Singapore, two distinct clusters were observed from a principal component analysis plot, which correspond to the origin of the tap water. The successful discrimination and identification of in this study demonstrates the practical application of the SGT as a simple tool for water analysis.

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Candadai, Aaditya A., Anurag Kumar, Majed A. Alrefae, Dimitry Zemlyanov, and Timothy S. Fisher. "Rapid colorimetric analysis of graphene on copper." Corrosion Science 138 (July 2018): 319–25. http://dx.doi.org/10.1016/j.corsci.2018.04.019.

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Chiu, Jen, S. G. Fischer, and D. E. Robson. "Compositional analysis by coupled thermogravimetry—colorimetric titration." Thermochimica Acta 84 (March 1985): 83–87. http://dx.doi.org/10.1016/0040-6031(85)85376-4.

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Kovalev, Sergey, Tatyana Tikhomirova, and Vladimir Apyari. "Immobilized Sorption-Colorimetric Microprobes for Chemical Analysis." Photonics 10, no. 7 (July 7, 2023): 787. http://dx.doi.org/10.3390/photonics10070787.

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Here, we propose a concept of immobilized sorption-colorimetric microprobes for preconcentration and sensing of colored analytical forms. Individual particles of sorbents distributed over a small area of 1 mm × 1 mm and attached to an easy-to-made strip with an adhesive layer were considered as the probes producing colorimetric responses through preconcentration of colored analytical forms. These responses were then directly recorded with a scanner at 1200 dpi, separated from a background, and processed to obtain information about the amounts of analytes. The food dyes Fast Green FCF, and Ponceau-4R were used as the proof-of-concept colored analytes. The microprobes based on silica modified with quaternary ammonium bases and on alumina were studied. Some features of the analytes’ adsorption by the probes and their scanometric sensing were found. It was shown that the proposed method is applicable for the determination of 1–7 mg L−1 of the dyes.

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Oh, Hyun Ju, Byeong Jin Yeang, Young Ki Park, Hyun Jung Choi, Jong H. Kim, Young Sik Kang, Younghwan Bae, et al. "Washable Colorimetric Nanofiber Nonwoven for Ammonia Gas Detection." Polymers 12, no. 7 (July 16, 2020): 1585. http://dx.doi.org/10.3390/polym12071585.

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The colorimetric sensor is a facile, cost-effective, and non-power-operated green energy material for gas detection. In this study, the colorimetric sensing property of a meta-aramid/dye 3 nanofiber sensor for ammonia (NH3) gas detection was investigated. This colorimetric sensor was prepared using various dye 3 concentrations via electrospinning. Morphological, thermal, structural, and mechanical analyses of the sensor were carried out by field-emission scanning electron microscopy, thermogravimetric analysis, Fourier-transform infrared spectroscopy, and a universal testing machine, respectively. A homemade computer color matching machine connected with a gas flow device characterized the response of the meta-aramid/dye 3 nanofiber colorimetric sensor to various exposure levels of NH3 gas. From the results, we confirmed that this colorimetric green energy sensor could detect ammonia gas in the concentration of 1–10 ppm with a sensing response time of 10 s at room temperature. After washing with laundry detergent for 30 min, the colorimetric sensors still exhibited sensing property and reversibility.

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Kim, Ju Yeon, Seok Joon Mun, Yoon Ho Roh, and Ki Wan Bong. "Rapid colorimetric analysis of multiple microRNAs using encoded hydrogel microparticles." Analyst 146, no. 18 (2021): 5508–16. http://dx.doi.org/10.1039/d1an00622c.

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Khimchenko, S. V., and L. P. Eksperiandova. "Colorimetric and stochastic assessment of the visual limit of color perception for visual colorimetric analysis." Journal of Analytical Chemistry 69, no. 4 (March 26, 2014): 322–26. http://dx.doi.org/10.1134/s1061934814040042.

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Lee, Sang Yoon, Hyo Je Park, Cheol Woo Han, Seung Yun Lee, and Gi Young Kweon. "Validation of a Rapid Colorimetric Method with Field Soils." Transactions of the ASABE 60, no. 4 (2017): 1271–78. http://dx.doi.org/10.13031/trans.12204.

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Abstract. Regularly monitoring the variations in soil composition is an essential part of proper cultivation management. Some conventional soil characterization methods are often costly and require experienced labor. The spectroscopic method is a simpler procedure that minimizes experimental steps and is faster and more economical than conventional methods. Wide-ranging analytical methods have been developed to determine soil phosphorus concentrations in the field; however, no method has been commercialized. Analytical methods based on colorimetric Mehlich-3 and Lancaster soil tests, developed to reduce measurement time in laboratories in the U.S. and South Korea, have been efficient. However, due to laboratory procedures, the soil was pretreated and not verified with field soil. We tested the rapid colorimetric method, which is for on-site plant-available soil phosphorus tests in the field and allows reduced analysis time. The target accuracy of the field tests was >70% correlation with laboratory test results. This method consists of three steps: fast extraction, fast filtration, and fast color development. In a comparison of the rapid colorimetric method and the standard laboratory procedure, the R2 values were 0.78, 0.71, 0.72, and 0.74, respectively, for field soils collected in four regions of South Korea. However, the results showed significant differences in some areas. When the moisture content and electrical conductivity of soil from each region were included in the multiple regression analysis, the cross-validation results showed superior output with no significant difference (p > 0.05). Keywords: Colorimetry, Phosphorus, Precision agriculture, Sensor, Soil.

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Eyupoglu, Ozan. "Protein Staining and Analysis with Artificial Intelligence Color Algorithm Analysis with 2-Dimensional Inkjet Printer to Identify Covid-19 Adhesion and Infected Properties on Artificial Body Fluid." Pharmaceutics and Pharmacology Research 3, no. 3 (December 10, 2020): 01–05. http://dx.doi.org/10.31579/2693-7247/022.

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In this study, the predictive modeling of Covid-19 viral contamination on artificial body fluids (simulated lung fluid, perspiration, saliva, and urine) was done by colorimetric analysis of protein staining on paper ground with henna ethanolic extract loaded on a 2-dimensional printer cartridge. The purchased artificial body fluids were left in the open-air atmosphere of sterile containers to the public places of pandemic hospitals, pharmacies, which are the most frequent places of Covid-19 patients for 2 weeks. These body fluids, which were then thought to be Covid-19 adsorption, were safely collected and placed in the cartridge chambers of the 2-D printer. The mixtures of artificial body fluids and henna plant extract in the cartridges were sprayed on the paper floor by ink painting. The algorithmic matrix code system was created by colorimetric predictive scaling between +1 and -1 about the images of viral transmission to artificial body fluids taken with a smartphone.

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Yoo, Yeongsik, and Woo Sik Yoo. "Turning Image Sensors into Position and Time Sensitive Quantitative Colorimetric Data Sources with the Aid of Novel Image Processing/Analysis Software." Sensors 20, no. 22 (November 10, 2020): 6418. http://dx.doi.org/10.3390/s20226418.

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Still images and video images acquired from image sensors are very valuable sources of information. From still images, position-sensitive, quantitative intensity, or colorimetric information can be obtained. Video images made of a time series of still images can provide time-dependent, quantitative intensity, or colorimetric information in addition to the position-sensitive information from a single still image. With the aid of novel image processing/analysis software, extraction of position- and time-sensitive quantitative colorimetric information was demonstrated from still image and video images of litmus test strips for pH tests of solutions. Visual inspection of the color change in the litmus test strips after chemical reaction with chemical solutions is typically exercised. Visual comparison of the color of the test solution with a standard color chart provides an approximate pH value to the nearest whole number. Accurate colorimetric quantification and dynamic analysis of chemical properties from captured still images and recorded video images of test solutions using novel image processing/analysis software are proposed with experimental feasibility study results towards value-added image sensor applications. Position- and time-sensitive quantitative colorimetric measurements and analysis examples are demonstrated.

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Jarvie, D. R., R. Heyworth, and D. Simpson. "Plasma Salicylate Analysis: A Comparison of Colorimetric, HPLC and Enzymatic Techniques." Annals of Clinical Biochemistry: International Journal of Laboratory Medicine 24, no. 4 (July 1987): 364–73. http://dx.doi.org/10.1177/000456328702400405.

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Three colorimetric techniques and one enzymatic technique have been compared with an HPLC method for the analysis of salicylate in the plasma of patients after self-poisoning with aspirin. The enzymatic technique was specific but expensive to perform. The colorimetric techniques were simple, cheap and precise. The Keller method, however, was susceptible to interference from endogenous substances. We report a modification of the Keller method that eliminates most of this interference and improves the accuracy of the analysis. The new method is easier and safer to perform under emergency conditions than the Trinder technique.

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Bueno, Diana, Luis Valdez, Juan Gutiérrez Salgado, Jean Marty, and Roberto Muñoz. "Colorimetric Analysis of Ochratoxin A in Beverage Samples." Sensors 16, no. 11 (November 10, 2016): 1888. http://dx.doi.org/10.3390/s16111888.

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Dzhashi, B. G., and S. V. Balalin. "COLORIMETRIC ANALYSIS IN ESTIMATING THE EFFICIENCY OF TRABECULOCLINIG." Journal of Volgograd State Medical University 77, no. 1 (March 31, 2021): 79–83. http://dx.doi.org/10.19163/1994-9480-2021-1(77)-79-83.

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Wei, Haoran, Seyyed M. Hossein Abtahi, and Peter J. Vikesland. "Plasmonic colorimetric and SERS sensors for environmental analysis." Environmental Science: Nano 2, no. 2 (2015): 120–35. http://dx.doi.org/10.1039/c4en00211c.

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Coleman, Benjamin, Chad Coarsey, Md Alamgir Kabir, and Waseem Asghar. "Point-of-care colorimetric analysis through smartphone video." Sensors and Actuators B: Chemical 282 (March 2019): 225–31. http://dx.doi.org/10.1016/j.snb.2018.11.036.

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Oddy, W. A. "The touchstone: the oldest colorimetric method of analysis." Endeavour 10, no. 4 (January 1986): 164–66. http://dx.doi.org/10.1016/0160-9327(86)90089-x.

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KODO, Kimi. "3009 Colorimetric analysis of the lubricating oil contamination." Proceedings of the JSME annual meeting 2007.4 (2007): 103–4. http://dx.doi.org/10.1299/jsmemecjo.2007.4.0_103.

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Lin, John T., Donald G. Cornell, and Thomas J. Micich. "Cobaltothiocyanate colorimetric analysis for homologous polyoxyethylated alkyl amides." Journal of the American Oil Chemists' Society 63, no. 12 (December 1986): 1575–79. http://dx.doi.org/10.1007/bf02553089.

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Rouland, J. F., D. Steen, and P. Dubois. "P 380 Colorimetric analysis of the retinal pigmentation." Vision Research 35 (October 1995): S224. http://dx.doi.org/10.1016/0042-6989(95)90640-1.

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