Manufacturing and application of dual-wavelength pH value colorimetric sensing material luminal derivative and functional colorimetric test paper
A colorimetric sensing, dual-wavelength technology, which is applied in the direction of chemical reaction of materials, material analysis, material analysis by optical means, etc., can solve the problem of expensive instruments, small pH value response range, and limited detection methods. Practical application and other issues, to achieve the effect of simple operation
Active Publication Date: 2017-12-12
梁山县水泊梁山食品有限公司
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Problems solved by technology
However, most of these methods are complicated in the testing process, including cumbersome experimental procedures, difficult sample pretreatment, small pH response range, long time-consuming, expensive instruments and other shortcomings, which limit the practical application of the detection method
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Embodiment 1
[0038] (1) Preparation of luminol derivatives as a dual-wavelength pH colorimetric sensing material
[0039] Accurately weigh 0.443g (0.25mmol) of luminol, place it in a 50mL round-bottomed flask, add 8.0mL of DMF and 0.0362g (0.52mmol) of sodium nitrite in sequence, cool in an ice-water bath to 0-5°C, and use concentrated Adjust the pH value to about 2 with hydrochloric acid, continue stirring for 30.0min, add 6.0mg urea to destroy unreacted sodium nitrite; add 0.789mL (0.5mmol) N-ethyl-N-hydroxyethylaniline dropwise, and wash with saturated Na 2 CO 3 The pH value of the solution was adjusted to about 7, and the stirring reaction was continued at room temperature for 2 h; the precipitate was filtered, and the crude product was recrystallized 3 times with ethanol to obtain purple-red crystals with a yield of 92.1%.
[0040] The structure of luminol derivatives as a dual-wavelength pH value colorimetric sensing material was characterized by infrared, NMR, elemental analysis an...
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Abstract
The invention relates to manufacturing and application of dual-wavelength pH value colorimetric sensing material luminal derivative and functional colorimetric test paper. The preparation method of the dual-wavelength pH value colorimetric sensing material luminal derivative comprises the following steps: taking luminal and N-ethyl-N-ethoxyl aniline as raw materials, and carrying out a subsection reaction such as coupling in a diazotized saturated Na2CO3 solution with the pH value of 7 under a strong acid condition that the pH value is 2. The pH value in an environmental water sample such as fruit (vegetable) juice can be quickly and quantitatively detected, the pH value is in a linear range of 4.0 to 11.0, and the preparation method is simple in operation and free of toxicity or pollution.
Description
technical field [0001] The invention belongs to the application field of colorimetric detection of pH value in food environment, and in particular relates to a new technology for making and applying a dual-wavelength pH value colorimetric sensing material luminol derivative and functionalized colorimetric test paper. Background technique [0002] In view of the important influence of pH value on different physiological processes (such as cell growth, calcification, canceration, cell proliferation, drug resistance, phagocytosis, etc.), the design and application of efficient and fast pH value detection methods have attracted scientific workers at home and abroad. With extensive attention, different pH analysis techniques have been developed and reported, such as spectrophotometry, high performance liquid chromatography, flow injection, capillary electrophoresis, electrochemical voltammetry, etc. However, most of these methods are complicated in the testing process, including ...
Claims
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Login to View More IPC IPC(8): C07D237/32G01N21/80
CPCC07D237/32G01N21/80G01N2021/7759
Inventor 严正权鲍晨汤慧张学忠胡蕾
Owner 梁山县水泊梁山食品有限公司