Method for determinating content of sodium metabisulfite in ginger

The technology of a sodium pyrosulfite and a determination method is applied in the field of determination of sodium pyrosulfite content in ginger, which can solve problems such as inaccurate measurement results, human health hazards, and poor stability, and achieve good detection stability, good repeatability, and content The effect of high accuracy and precision

Inactive Publication Date: 2019-02-15
昌邑市检验检测中心
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] This shows that although sodium pyrosulfite can keep the color and luster of ginger, it has greater harm to human health, therefore, the mensuration of sodium pyrosulfite content in ginger become...

Method used

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  • Method for determinating content of sodium metabisulfite in ginger
  • Method for determinating content of sodium metabisulfite in ginger
  • Method for determinating content of sodium metabisulfite in ginger

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Weigh the ginger powder and place it in the iodine measuring bottle, accurately pipette the iodine standard solution into the iodine measuring bottle, stopper and shake well to dissolve, and place it in the dark for 5-10 minutes; then add the acid solution, and then use the sodium thiosulfate standard When the solution is titrated close to the titration end point, add starch indicator and continue titration until the blue color of the solution disappears, which is the titration end point.

[0057] With the above detection method, under the same conditions, get 6 parts of ginger powder to be tested, measure the content of sodium pyrosulfite in ginger respectively, and calculate the standard deviation and detection limit according to the content of sodium pyrosulfite. The relative standard deviation and detection limit of sodium metabisulfite content in ginger powder are shown in Table 1.

[0058] Table 1 Relative standard deviation and detection limit

[0059]

[006...

Embodiment 2

[0062] Weigh the ginger powder and place it in the iodine measuring bottle, accurately pipette the iodine standard solution into the iodine measuring bottle, stopper and shake well to dissolve, and place it in the dark for 5-10 minutes; then add the acid solution, and then use the sodium thiosulfate standard When the solution titration is close to the titration end point, add starch indicator and continue titration until the blue color of the solution disappears, which is the titration end point.

[0063] Under the same conditions, take 3 groups of ginger powders to be tested, set 3 replicates in each group of ginger powders, add one time method detection limit, two times method detection limit and ten times The sodium metabisulfite standard substance with the detection limit of the method was tested with the above-mentioned detection method, and the recovery rate and RSD value of the standard addition were calculated; the data of the recovery rate and RSD value of the standard...

Embodiment 3

[0068] Weigh the ginger powder and put it in the iodine measuring bottle, accurately pipette the iodine standard solution into the iodine measuring bottle, shake well to dissolve after stoppering, and place it in the dark for 5-10 minutes; then add the acid solution, and then use the sodium thiosulfate standard When the solution titration is close to the titration end point, add starch indicator and continue titration until the blue color of the solution disappears, which is the titration end point.

[0069] With the above detection method, under the same conditions, get 6 parts of ginger powder to be tested and measure the content of sodium metabisulfite in the ginger, and when calculating the titration end point, the blue retention time. The blue retention time at the titration end point is shown in Table 3.

[0070] Table 3 Titration endpoint blue retention time

[0071]

[0072] Find out by above-mentioned data, method of the present invention when measuring the sodium...

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Abstract

The invention is applicable to the technical field of agricultural product detection, and provides a method for determinating the content of sodium metabisulfite in ginger. The method comprises the following steps: cleaning impurities and soil on the surfaces of gingers, and then uniformly cutting to obtain ginger blocks; drying the ginger blocks, then performing vacuum drying, and then crushing to obtain ginger powder; weighing the ginger powder, putting into an iodine volumetric flask, then accurately transferring an iodine standard solution to the iodine volumetric flask, dissolving by uniformly shaking, then adding an acid solution into the iodine volumetric flask, titrating with a standard solution of sodium thiosulfate after completion of addition, then adding a starch indicator nearthe end of titration, and continuing titration till the end of the titration. By the method, an end point is easy to judge and the detection limit is relatively low, and the method is suitable for detection of a low-content sample; and meanwhile, the determination accuracy and the determination precision are relatively high.

Description

technical field [0001] The invention relates to the technical field of agricultural product detection, in particular to a method for determining the content of sodium metabisulfite in ginger. Background technique [0002] Food is the most important thing for the people, and food safety is the first priority. Food safety is related to everyone's health and life, and food safety has been paid more and more attention by people. Sodium metabisulfite is a food additive, which can be used as bleaching agent, preservative, loosening agent, antioxidant, color-protecting agent and preservative in the food industry; after antiseptic dyeing with sodium metabisulfite, it can maintain the moisture of ginger and make ginger The color is bright yellow and looks good. [0003] However, sodium pyrosulfite also has certain hazards. It will decompose sulfur dioxide in the air. This compound residue will strongly stimulate the human respiratory tract and gastric mucosa, causing cough and asthm...

Claims

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Application Information

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IPC IPC(8): G01N31/16
CPCG01N31/16
Inventor 王兆全姜雅红徐璐尹宝华冯超
Owner 昌邑市检验检测中心
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