Method for detecting fluorescent brightener in food and paper packaging thereof

A fluorescent whitening agent and detection method technology, applied in the field of fluorescent whitening agent detection, to achieve the effect of simple experimental equipment, good repeatability, and convenient operation

Inactive Publication Date: 2014-02-26
邢台市产品质量监督检验所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The detection methods stipulated in the local standard DB51 / T 907-2009 of Sichuan Province "Detection Procedures for Fluorescent Brighteners in Edible Fungi" and the local standards of Hebei Province DB 13 / T 1114-2009 "Determination of Fluorescent Brighteners in Small Flour" are also consistent with There is no essential difference between the above national standard detection methods

Method used

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  • Method for detecting fluorescent brightener in food and paper packaging thereof
  • Method for detecting fluorescent brightener in food and paper packaging thereof
  • Method for detecting fluorescent brightener in food and paper packaging thereof

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Experimental program
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Effect test

Embodiment 1

[0035] (1) The preparation method of the fluorescent whitening agent standard solution is: accurately weigh 0.01g of VBL fluorescent whitening agent, add an alkaline solution with a pH value of 8.5-9.5 to dissolve, stir until completely dissolved, transfer to a 100 mL volumetric flask to set To obtain a standard stock solution of fluorescent whitening agent with a concentration of 100 mg / L. The stock solution was accurately diluted to 5 mg / L, 10 mg / L, 20 mg / L, 40 mg / L, 80 mg / L with an alkaline solution with a pH value of 8.5-9.5.

[0036] (2) Prepare the standard curve: use a UV spectrophotometer to detect the above standard solution at 350nm, and make a standard curve between the concentration of the fluorescent whitening agent and the absorbance (see figure 1 );

[0037](3) Extract fluorescent whitening agent; take 1.0g of noodle wrapping paper sample, cut into 1-1.5cm 2 Put the fragments in a beaker, add 20mL of alkaline solution, extract at room temperature, in the dark,...

Embodiment 2

[0040] (1) The preparation method of fluorescent whitening agent standard solution is as follows: accurately weigh 0.01g of CXT fluorescent whitening agent, add an alkaline solution with a pH value of 8.5-9.5 to dissolve, stir until completely dissolved, transfer to a 100 mL volumetric flask to set To obtain a standard stock solution of fluorescent whitening agent with a concentration of 100 mg / L. The stock solution was accurately diluted to 5 mg / L, 10 mg / L, 20 mg / L, 40 mg / L, 80 mg / L with an alkaline solution with a pH value of 8.5-9.5.

[0041] (2) Prepare a standard curve: use a UV spectrophotometer to detect the above standard solution at 350nm, and make a standard curve between the concentration of the fluorescent whitening agent and the absorbance;

[0042] (3) Extract fluorescent whitening agent; take 2.0g sample of Flammulina velutipes, cut into 1-1.5 cm 3 and put them in a beaker, add 30mL alkaline solution, extract at room temperature, in the dark, ultrasonically for...

Embodiment 3

[0045] (1) The preparation method of the fluorescent whitening agent standard solution is: accurately weigh 0.01g of BBU fluorescent whitening agent, add an alkaline solution with a pH value of 8.5-9.5 to dissolve, stir until completely dissolved, transfer to a 100 mL volumetric flask to set To obtain a standard stock solution of fluorescent whitening agent with a concentration of 100 mg / L. The stock solution was accurately diluted to 5 mg / L, 10 mg / L, 20 mg / L, 40 mg / L, 80 mg / L with an alkaline solution with a pH value of 8.5-9.5.

[0046] (2) Prepare a standard curve: use a UV spectrophotometer to detect the above standard solution at 350nm, and make a standard curve between the concentration of the fluorescent whitening agent and the absorbance;

[0047] (3) Extract fluorescent whitening agent; take 1.5g sample of French fries wrapping paper, cut into 1-1.5cm 2 Put the fragments in a beaker, add 25mL of alkaline solution, extract at room temperature, in the dark, ultrasonica...

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Abstract

The invention discloses a method for detecting a fluorescent brightener in food and paper packaging thereof. The method comprises the following steps: (1) preparing fluorescent brightener standard solutions with different concentrations; (2) preparing a standard curve between the fluorescent brightener concentration and absorbancy; (3) extracting a fluorescent brightener; and (4) arranging the filtrate in the step (3) in a quartz cuvette being 1cm, measuring the absorbancy at 350nm by adopting an ultraviolet spectrophotometer, performing a blank experiment, and calculating to obtain the content of the fluorescent brightener in the food and paper packaging thereof according to the standard curve obtained in the step (2). The fluorescent brightener detection in the food and the paper packaging thereof is realized by adopting ultraviolet spectrophotometry, the experimental apparatus is simple, the operation is convenient, and the method has the advantages of quantitative analysis, low detection limit, high repeatability and the like and is suitable for measurement of micro and trace components.

Description

technical field [0001] The invention relates to a detection method for fluorescent whitening agents in food and its paper packaging. Background technique [0002] Fluorescent whitening agent is a kind of fluorescent substance that absorbs ultraviolet light and emits blue or purple-blue light. As a fluorescent whitening agent, its molecules have a planar conjugated system formed by π electrons, with a structure such as figure 1 . After the compound of this structure absorbs ultraviolet rays (300-400 nm), the electrons are excited from the ground state to the active state, and return to the ground state in a very short time, and can emit fluorescence with a wavelength of 420-450 nm. The reason why the fluorescent whitening agent has a whitening effect is that the substance adsorbed with the fluorescent whitening agent can not only emit the visible light irradiated on the object, but also convert the invisible ultraviolet light into visible light and reflect it, which increas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/33G01N1/28G01N1/38
Inventor 刘荣琴康牧旭周刚焦宁刘智聪郭喜强池春山刘乐平
Owner 邢台市产品质量监督检验所
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