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Method for determination of content of nitrite in jam

A nitrite and jam technology, which is applied in the preparation of test samples and the measurement of color/spectral properties, etc., can solve the problems that need to be improved, and achieve the effects of strong accuracy, low detection limit and high recovery rate.

Inactive Publication Date: 2018-05-22
INNER MONGOLIA MENGNIU DAIRY IND (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the current method for the determination of nitrite content in jam still needs to be improved

Method used

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  • Method for determination of content of nitrite in jam
  • Method for determination of content of nitrite in jam
  • Method for determination of content of nitrite in jam

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] In this embodiment, measure the nitrite content in the jam according to the following steps:

[0056] 1. Weigh 10g of jam (accurate to 0.01g) to make a homogenized sample group (if water is added during the preparation process, it should be converted according to the amount of water added, ignoring the error caused by the density of jam, and 10g of sample is converted into 10ml of water for conversion), blank The group without jam was placed in a 300ml Erlenmeyer flask, each with 10mL of saturated borax solution, and stirred evenly. The sample group was added with 160ml of water at about 70°C, and the blank group was added with 170ml of water at about 70°C, mixed evenly, and placed in boiling water. Heated in a bath for 15 minutes, then placed in a cold water bath to cool, and left to room temperature to obtain an extract.

[0057] 2. Extraction purification

[0058] The extracts of the sample group and the blank group were subjected to the following operations:

[00...

Embodiment 2

[0067] In this example, recovery was determined as follows:

[0068] (1) Mix 10 grams (accurate to 0.01g, without sodium nitrite) jam with sodium nitrite standard solution and set the volume to 200mL to obtain a spiked sample, wherein, according to the added sodium nitrite standard solution, the nitrite The sodium content is converted into the sodium nitrite content in the spiked sample, which is recorded as the theoretical content;

[0069] (2) detect the sodium nitrite content in the standard-added sample according to the method of embodiment 1, record as measured content;

[0070] (3) Calculate the recovery rate according to the formula recovery rate (%)=100×measured content / theoretical content.

[0071] F.1 of GB / T 27404-2008 "Laboratory Quality Control Specifications for Food Physical and Chemical Testing" gives the content of the tested components and the corresponding recovery range values ​​that meet the requirements, see Table 1 for details.

[0072] Table 1 GB / T 27...

Embodiment 3

[0080] The recovery rate of the nitrite content in the jam was determined according to the method of Example 2, the difference being that in step 3 of Example 1, after adding the p-aminobenzenesulfonic acid solution and mixing, the standing time was 5 minutes.

[0081] The results are shown in Table 3. When the p-aminobenzenesulfonic acid solution was left standing for 5 minutes, the recovery rate was in the range of 80-110%.

[0082] Table 3 adds the influence of p-aminobenzenesulfonic acid solution standing time (5min) on detection results

[0083] serial number

[0084] Note: Serial numbers 2 to 7 represent parallel samples

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Abstract

The invention discloses a method for determination of the content of nitrite in jam. The method comprises the steps: mixing the jam, a saturated borax solution and water, and heating the obtained mixed solution in a boiling water bath, to obtain an extract liquid; mixing the extract liquid, a potassium ferrocyanide solution and a zinc acetate solution, allowing to stand, filtering the obtained mixture, and collecting an obtained purification liquid; mixing the purification liquid with a p-aminophenol sulfonic acid solution, allowing to stand for 5-8 minutes for the first time, then mixing theobtained mixture with an N-(1-naphthyl) ethylenediamine dihydrochloride solution, allowing to stand for 10-15 minutes for the second time, and making the volume of the obtained mixture constant with water, to obtain a to-be-detected liquid; and detecting the to-be-detected liquid by a spectrophotometric method, and determining the content of nitrite in the jam based on the detection result. The method for the determination of the content of nitrite in the jam can accurately determine the content of nitrite in the jam, and has the advantages of low detection limit, high recovery rate and precision degree and simple operation.

Description

technical field [0001] The invention relates to the field of food. Specifically, the present invention relates to a method for determining the content of nitrite in jam. Background technique [0002] Nitrite exists widely in the human environment and is the most common nitrogen-containing compound in nature. Nitrite is a strong oxidizing agent under acidic conditions. After entering the human body, it can oxidize low iron hemoglobin in blood to methemoglobin, lose the function of transporting oxygen, and cause tissue hypoxia, cyanosis and poisoning. Consumption of food containing excess nitrite can lead to poisoning, severe overdose will lead to death, so it is necessary to detect nitrite in food. [0003] However, the current method for the determination of nitrite content in jam still needs to be improved. Contents of the invention [0004] The present invention aims to solve at least one of the technical problems existing in the prior art. For this reason, an object...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31G01N1/28
Inventor 胡珍珍朱如盛吴小慧金珠仝面换高建军
Owner INNER MONGOLIA MENGNIU DAIRY IND (GRP) CO LTD
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