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138 results on '"Mohiuddin, Irshad"'

21. A Review of Sensing Applications of Molecularly Imprinted Fluorescent Carbon Dots for Food and Biological Sample Analysis.

Author

Mohiuddin, Irshad, Singh, Raghubir, and Kaur, Varinder

Subjects
*BIOPOLYMERS, *FOOD additives, *IMPRINTED polymers, *MATERIALS science, *FOOD science, *QUANTUM dots
Abstract

Molecularly imprinted fluorescent carbon dots (MI-FCDs) find numerous applications in analytical chemistry due to their outstanding photoluminescent properties and having specific pockets for the recognition of target molecules. Despite significant advances, practical applications of MI-FCDs-based fluorescent sensors are still in their initial stages. Therefore, the topical developments in the synthesis, working, and application of MI-FCDs for sensing various target species (e.g., pharmaceuticals, biomolecules, pesticides, food additives, and miscellaneous species) in food and biological media have been highlighted. Moreover, a careful evaluation has been made to select the best methods based on their performance in terms of analytical parameters. To expand the horizons of this field, important challenges and future directions for developing MI-FCDs for practical use are also presented. This review will highlight important aspects of MI-FCDs-based fluorescent sensors for their applicability in food science, material science, environmental science, nanoscience, and biotechnology. Highlights: Fabrication of MI-FCDs probes with sensing properties. Recognition ability of MI-FCDs via single or dual emission detection. Important sensing applications in food and biological samples. Comparison of performance of MI-FCDs based on analytical parameters. Discussion on challenges and future trends of MI-FCDs probes. [ABSTRACT FROM AUTHOR]

Published
2024
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22. A Review of the Analysis of Phthalates by Gas Chromatography in Aqueous and Food Matrices.

Author

Bhogal, Shikha, Grover, Aman, and Mohiuddin, Irshad

Subjects
ENDOCRINE disruptors, COMPLEX matrices, EXTRACTION techniques, GAS analysis, CONSTRUCTION materials, PHTHALATE esters
Abstract

As a commonly well-known industrial chemical, phthalates are produced in high volumes to be used in various consumer products (e.g., plasticizers, medical devices, construction materials, and toys) to enhance softness, durability, transparency, and flexibility. Phthalates are generally not chemically bonded to the polymer chain of the plastic in which they are mixed. Thus, they may leach, migrate, or evaporate into indoor/outdoor air, and foodstuffs. In this review, a comprehensive overview of several sample preparation methods coupled with gas chromatography for the analysis of phthalates in various kinds of complex matrices, with a focus on the last 20 years' worth of papers. The review begins by highlighting the environmental significance of phthalate pollution along with the various routes to their exposure to general population. Then, the discussion is extended to cover the pretreatment and extraction techniques for phthalates for their quantitation based on gas chromatographic approach. Finally, the present and future challenges for the detection of phthalates in aqueous and food matrices are discussed. [ABSTRACT FROM AUTHOR]

Published
2024
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50. Bis(thiophen-2-yl-methylene) Benzene-1, 4-Diamine as Fluorescent Probe for the Detection of Fe3+ in Aqueous Samples.

Author

Berhanu, Asnake Lealem, Bhogal, Shikha, Mohiuddin, Irshad, Grover, Aman, Malik, Ashok Kumar, and Aulakh, Jatinder Singh

Subjects
FLUORESCENT probes, SCHIFF bases, BINDING constant, DENSITY functional theory, DETECTION limit
Abstract

A Schiff base bis(thiophen-2-yl-methylene)benzene-1, 4-diamine (L) was synthesized and used for selective and sensitive detection of Fe3+. L exhibited enhanced fluorescence response at excitation of 365 nm and emission wavelength of 440 nm for Fe3+. The formation of a 1:1 complex between L and Fe3+ was suggested by Job's plot by fluorescence titration and from optimized structures using Density functional theory (DFT). The fluorescence intensity was directly proportional to concentration of Fe3+ (R2 = 0.999) with the detection limit of 3.8 × 10–7 M and the binding constant of 1.20 × 104 M−1 at pH = 6.0. The probe was used to detect Fe3+ in different water samples with the percentage recovery of 99.7–103%. The interference of the other cations are < 5%. [ABSTRACT FROM AUTHOR]

Published
2022
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