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Method for detecting furfural content based on up-conversion fluorescence nano system

A detection method and fluorescent nanotechnology, applied in fluorescence/phosphorescence, material excitation analysis, etc., can solve the problems of long detection time, high manpower requirements, and high detection cost, and achieve low detection limit, high detection accuracy and sensitivity, and strong fluorescence. Responsive Effects

Pending Publication Date: 2022-07-29
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the defects of high detection cost, long detection time and high manpower requirement in the prior art, and provide a ratiometric fluorescent nanosensor based on upconversion and p-toluidine specificity system for furfural quantification in food, In order to achieve high specificity and sensitivity detection of furfural in food

Method used

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  • Method for detecting furfural content based on up-conversion fluorescence nano system
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  • Method for detecting furfural content based on up-conversion fluorescence nano system

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Embodiment 1

[0033] The invention discloses a method for detecting furfural content in food based on an up-conversion and p-toluidine-specific system. The specific steps are:

[0034] Step 1, preparation of up-conversion nanomaterials: Accurately weigh 0.2366g yttrium chloride hexahydrate, 0.0775g ytterbium chloride hexahydrate, 0.0076g erbium chloride hexahydrate, dissolve with 10mL of methanol ultrasonically for 10min, and transfer to a three-necked flask, Add 7mL of oleic acid and 15mL of octadecene; under the protection of argon, heat to 160°C for the first time, and cool to room temperature with magnetic stirring for 30min; add 0.6g of ammonium fluoride and 0.4g of hydrogen to the cooling liquid dropwise The methanol solution of sodium oxide was 10 mL, then the first water bath was reacted at 50 °C for 30 min, and the second water bath was reacted at 75 °C for 40 min, so that the methanol in the solution was completely volatilized; then, under argon protection, the second heating to 30...

Embodiment 2

[0040] The invention discloses a method for detecting furfural content in food based on an up-conversion and p-toluidine-specific system. The specific steps are:

[0041] Step 1, preparation of up-conversion nanomaterials: Accurately weigh 0.2366g yttrium chloride hexahydrate, 0.0775g ytterbium chloride hexahydrate, 0.0076g erbium chloride hexahydrate, dissolve with 10mL of methanol ultrasonically for 10min, and transfer to a three-necked flask, Add 7mL of oleic acid and 15mL of octadecene; under the protection of argon, heat to 150°C for the first time, and cool to room temperature with magnetic stirring for 30min; add 0.6g of ammonium fluoride and 0.4g of hydrogen to the cooling liquid dropwise The methanol solution of sodium oxide was 10 mL, then the first water bath was reacted at 40 °C for 30 min, and the second water bath was reacted at 70 °C for 40 min, so that the methanol in the solution was completely volatilized; then, under argon protection, the second heating to 29...

Embodiment 3

[0046] The invention discloses a method for detecting furfural content in food based on an up-conversion and p-toluidine-specific system. The specific steps are:

[0047] Step 1, preparation of up-conversion nanomaterials: Accurately weigh 0.2366g yttrium chloride hexahydrate, 0.0775g ytterbium chloride hexahydrate, 0.0076g erbium chloride hexahydrate, dissolve with 10mL of methanol ultrasonically for 10min, and transfer to a three-necked flask, Add 7mL of oleic acid and 15mL of octadecene; under the protection of argon, heat to 170°C for the first time, and cool to room temperature with magnetic stirring for 30min; add 0.6g of ammonium fluoride and 0.4g of hydrogen to the cooling liquid dropwise The methanol solution of sodium oxide was 10 mL, then the first water bath was reacted at 60 °C for 30 min, and the second water bath was reacted at 80 °C for 40 min, so that the methanol in the solution was completely volatilized; then, under argon protection, the second heating to 31...

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Abstract

The invention relates to the technical field of food safety detection, in particular to a furfural content detection method based on an up-conversion fluorescence nano system. The method comprises the following steps: firstly, preparing an up-conversion nano material; then modifying mesoporous silica and amino groups on the surface of the up-conversion nano material; dissolving the surface-modified up-conversion nano material, p-toluidine, barbituric acid and acetic acid in a reaction solvent to obtain a specific detection system; adding furfural solutions with different concentrations, measuring fluorescence intensity signals, and establishing a furfural content detection standard curve by taking a ratio value as a vertical coordinate and taking a furfural concentration logarithm value as a horizontal coordinate; by constructing a furfural fluorescence detection system, high-specificity and sensitive detection of furfural in food is achieved, and the method has a wide concentration detection range and a low detection limit and has a good application prospect.

Description

technical field [0001] The invention relates to the technical field of food safety detection, in particular to a method for detecting furfural content based on an up-conversion fluorescent nanometer system. Background technique [0002] Furfural is a typical heterocyclic aldehyde that is directly generated by caramelization and Maillard reactions. In general, furfural is considered an indicator of the quality of various foods during storage, especially carbohydrates or spoilage due to excessive heating. In addition, at certain doses, it can cause damage to the eyes and skin, and may be carcinogenic or mutagenic. Furfural can stimulate the skin and mucous membranes, and the maximum allowable concentration in the air is 5ppm; in the preliminary list of carcinogens published by the World Health Organization International Agency for Research on Cancer in 2017, furfural was listed as a class 3 carcinogen. [0003] The presence and accumulation of furfural has threatened the saf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/64
CPCG01N21/643
Inventor 陈全胜荣雅文欧阳琴张运莲丁小丹
Owner JIANGSU UNIV
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