Detection in UV-visible spectrophotometry: Detectors, detection systems, and detection strategies

Passos, Marieta L.C.; Saraiva, M. Lúcia M.F.S.

doi:10.1016/j.measurement.2018.12.045

Cited by 117 publications

(48 citation statements)

References 80 publications

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“…Free radicals are well-known molecular species that carry an unpaired electron in the paramagnetic group of the atomic orbital region of molecular species. As a result of the above, these are unstable, reactive, and can also cause redox reactions with other molecules [ 42 , 63 , 64 ].…”

Section: Methodologies For Elucidation Of Chemical Structure Of Pigmentsmentioning

confidence: 99%

Molecular Characterization of Fungal Pigments

Valenzuela-Gloria

Balagurusamy

Chávez‐González

et al. 2021

JoF

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The industrial application of pigments of biological origin has been gaining strength over time, which is mainly explained by the increased interest of the consumer for products with few synthetic additives. So, the search for biomolecules from natural origin has challenged food scientists and technologists to identify, develop efficient and less consuming strategies for extraction and characterization of biopigments. In this task, elucidation of molecular structure has become a fundamental requirement, since it is necessary to comply with compound regulatory submissions of industrial sectors such as food, pharmaceutical agrichemicals, and other new chemical entity registrations. Molecular elucidation consists of establishing the chemical structure of a molecule, which allows us to understand the interaction between the natural additive (colorant, flavor, antioxidant, etc) and its use (interaction with the rest of the mixture of compounds). Elucidation of molecular characteristics can be achieved through several techniques, the most common being infrared spectroscopy (IR), spectroscopy or ultraviolet-visible spectrophotometry (UV-VIS), nuclear-resonance spectroscopy (MAGNETIC MRI), and mass spectrometry. This review provides the details that aid for the molecular elucidation of pigments of fungal origin, for a viable and innocuous application of these biopigments by various industries.

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Section: Methodologies For Elucidation Of Chemical Structure Of Pigmentsmentioning

confidence: 99%

Molecular Characterization of Fungal Pigments

Valenzuela-Gloria

Balagurusamy

Chávez‐González

et al. 2021

JoF

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“…The contents are described using instruction, competency standards, learning objectives, concept maps, concept mastery checklists, and material description. The material description was the definition and working principle of UV-Vis spectrophotometry, sample measurement requirements, types of UV-Vis spectrophotometry, parts and functions of UV-Vis spectrophotometry, standard operational procedures in using UV-Vis spectrophotometer, analysis of impurity elements in lubricating oils and beef that provided with stimuli to improve students' scientific literacy [8,9]. In the end, there was a conclusion from the description of learning activities and was completed with evaluation questions, bibliography, stimulus list of students' literacy, and glossary.…”

Section: Designmentioning

confidence: 99%

Development of Learning Module on Oil and Beef Adulteration to Improve Students’ Understanding in Analytical Chemistry Course

Diana¹,

Gusti²,

Elvia³

et al. 2021

Advances in Social Science, Education and Humanities Research

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The use of teaching material developed from laboratory research is one way that can be done to improve students' scientific literacy in accordance to the challenges of 21 st century learning. This research aimed to resolve the feasibility of the developed analytical chemistry module, to improve students' scientific literacy, and the student's response to the use of the module in the analytical chemistry course. The module was developed using the 4D type of Research and Development method, i.e., Define, Design, Develop, and Disseminate. The quality of module was determined by an expert validation test. The scientific literacy was measured by a pre-test and post-test with essay questions. Relied on the results of expert validation, the module results on the content eligibility aspect of 92%, the presentation feasibility aspect of 85%, the language assessment aspect of 88.3%, the graphic assessment aspect of 83.3%, and overall results of 87.5% with a very good category. The averages of pre-test and post-test scores were 28.67 and 82.74. Based on the results of the hypothesis test, it was concluded that there was an increase in students' scientific literacy by using a module in the analytical chemistry course. The students' response to the use of the module in learning activities was 82.00% with a very good category and the assessment of the module was 86.17% with a very good category.

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“…where λ is the wavelength of a specific color; n = 1 (grating order); d = 740 (distance between slits in a DVD); and θ = diffraction angle. The main function of a detector is to convert a light signal into an electric signal [49]. The TEMT6000 ambient light sensor (Vishay Intertechnologies, PA, USA) is used for the detection stage.…”

Section: Monochromatormentioning

confidence: 99%

“…The main function of a detector is to convert a light signal into an electric signal [49]. The TEMT6000 ambient light sensor (Vishay Intertechnologies, PA, USA) is used for the detection stage.…”

Section: Detectormentioning

confidence: 99%

Development of a Low-Cost UV-Vis Spectrophotometer and Its Application for the Detection of Mercuric Ions Assisted by Chemosensors

González-Morales

Valencia

Díaz-Nuñez

et al. 2020

Sensors

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Detection of an environmental contaminant requires the use of expensive measurement equipment, which limits the realization of in situ tests because of their high cost, their limited portability, or the extended time duration of the tests. This paper presents in detail the development of a portable low-cost spectrophotometer which, by using a specialized chemosensor, allows detection of mercuric ions (Hg 2+ ), providing effective and accurate results. Design specifications for all the stages assembling the spectrophotometer and the elements selected to build them are presented along with the process to synthesize the chemosensor and the tests developed to validate its performance in comparison with a high-precision commercial laboratory spectrophotometer.

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Detection in UV-visible spectrophotometry: Detectors, detection systems, and detection strategies

Cited by 117 publications

References 80 publications

Molecular Characterization of Fungal Pigments

Molecular Characterization of Fungal Pigments

Development of Learning Module on Oil and Beef Adulteration to Improve Students’ Understanding in Analytical Chemistry Course

Development of a Low-Cost UV-Vis Spectrophotometer and Its Application for the Detection of Mercuric Ions Assisted by Chemosensors

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