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Method for measuring content of titanium dioxide in food and test pipeline

A titanium dioxide and determination method technology, which is applied in the direction of material analysis by observing the influence of chemical indicators, color/spectral characteristic measurement, and analysis by making materials undergo chemical reactions, can solve the problems of easy oxidation of ascorbic acid and other problems, and achieve The effects of avoiding ascorbic acid oxidation, improving efficiency and reducing labor costs

Pending Publication Date: 2021-12-07
ZHENGZHOU TOBACCO RES INST OF CNTC +1
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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 provide a method for measuring the content of titanium dioxide in food, which is used to solve the problem that ascorbic acid is easily oxidized when using ultraviolet spectrophotometry to measure the content of titanium dioxide in food and is prepared and used every day

Method used

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  • Method for measuring content of titanium dioxide in food and test pipeline

Examples

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Embodiment 1

[0039] The determination method of titanium dioxide content in the food of the present embodiment, take commercially available food (syrup, roasted peanut and strawberry jam) as the sample to be tested, utilize continuous flow analyzer to measure food by the continuous flow analyzer of embodiment 2 The test pipeline of the content of titanium dioxide in the medium is measured, which specifically includes the following steps:

[0040] (1) Sample digestion: put 0.25g of syrup in a microwave digestion tank, then add 2.5mL concentrated nitric acid and 2.5mL concentrated sulfuric acid into the microwave digestion tank, seal the digestion tank, and perform microwave digestion (see Table 1 for the digestion procedure) , to obtain a clear sample digestion solution.

[0041] Table 1 Microwave digestion program

[0042] step Initial temperature / °C Heating rate / ℃ / min End temperature / ℃ Hold time / min 1 room temperature(20) 20 120 3 2 120 12.5 220 5 3...

Embodiment 2

[0050] The test pipeline for the continuous flow analyzer of the present embodiment to measure the content of titanium dioxide in food, such as figure 1 As shown, including pipe 1, pipe 2, pipe 3, pipe 4, pipe 5, pipe 6, glass cross 7, mixing ring 8, T-shaped tee 9, mixing ring 10, T-shaped tee 11, mixing ring 12 , T-shaped tee 13, mixing ring 14, heating tank 15 and mixing ring 16;

[0051] The glass cross 7 has an air inlet, a dilution water inlet, a digestion solution inlet and an outlet, and one end of the pipeline 1, pipeline 2, and pipeline 3 is respectively connected with the air inlet, dilution water inlet, and digestion solution inlet of the glass cross 7 , the other end of pipeline 1 is used to connect to the air inlet pump tube, the other end of pipeline 2 is used to connect to the dilution water inlet pump tube, and the other end of pipeline 3 is used to connect to the digestion solution sampling pump tube;

[0052] The outlet of the glass cross 7 is connected to ...

experiment example

[0060] This experimental example has investigated the sensitivity of the assay method of titanium dioxide content in the food of the present invention, and the difference with embodiment 1 is, this experimental example changes the sample to be tested into standard solution, investigates the sensitivity of the titanium dioxide content in the food of the present invention with this The limit of detection and the limit of quantification of the determination method, and then examine the limit of detection and limit of quantification of the determination method of the comparative example. The results show that the detection limit of the assay method of titanium dioxide content in food of the present invention is 0.184mg / kg, the quantification limit is 0.613mg / kg, and the detection limit of the test method stipulated in GB / T5009.246-2016 is 1.5mg / kg. kg, the limit of quantification is 5.0mg / kg; the detection limit of the former is 1 / 8 of the latter, thus showing that the assay method...

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Abstract

The invention relates to a method for determining the content of titanium dioxide in food and a test pipeline for determining the content of titanium dioxide in food by a continuous flow analyzer and belongs to the technical field of food inspection. The method for measuring the content of titanium dioxide in food comprises the following steps of (1) mixing a digestion solution of a to-be-measured food sample with an ascorbic acid solution on line to obtain a to-be-measured solution; ascorbic acid being generated through online reaction of hydrochloric acid and an ascorbate solution; (2) uniformly mixing the to-be-detected solution with a diantipyrine methane solution on line to obtain a developing solution; and (3) carrying out ultraviolet spectrophotometric analysis on the color developing solution. The method is advantaged in that ascorbic acid used in the method for measuring the content of titanium dioxide in the food is generated through online reaction of hydrochloric acid and the ascorbate solution, the shelf life of ascorbate can reach 15 days or above, problems that ascorbic acid is prone to being oxidized and can be used after being prepared every day are solved, and a purpose of batch sample detection can be achieved.

Description

technical field [0001] The invention relates to a method for measuring the content of titanium dioxide in food and a test pipeline for measuring the content of titanium dioxide in food by a continuous flow analyzer, belonging to the technical field of food inspection. Background technique [0002] Titanium dioxide (TiO 2 ) can be used as a food additive, but China, the European Union and the US FDA have limited requirements for the amount of addition in different foods. GB 2760 permits the use of TiO 2 As a food additive, it can be used in limited quantities in gum-based candies, jams, shelled nuts and seeds, and seasoning syrups to improve the appearance of food. US FDA regulations, TiO 2 As a food coloring agent, the dosage should not exceed 1% of the weight of the food, and it is not allowed to be added to individual foods. Therefore, the determination of TiO 2 It is one of the important indicators of daily food safety control. [0003] Currently, TiO in food 2 The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/33G01N21/78
CPCG01N21/33G01N21/78
Inventor 郭军伟陈志燕颜权平范忠刘克建孟冬玲刘绍锋樊美娟王洪波赵乐刘惠民
Owner ZHENGZHOU TOBACCO RES INST OF CNTC
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