Method for rapid determination of sodium formaldehyde sulfoxylate in food additive

A technology for rapid determination of food additives, applied to measuring devices, instruments, scientific instruments, etc., can solve problems such as poor parallelism, large matrix interference, and low sensitivity, and achieve high accuracy, small matrix interference, and high sensitivity.

Inactive Publication Date: 2013-03-13
CHINA TOBACCO FUJIAN IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the law is subject to Cl - interference, need to use Ag exchange column to remove Cl - ;Oxidation method is used to process the sample, and the parallelism is poor; the conductivity cell is used for detection, the matrix interference is large and the sensitivity is low

Method used

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  • Method for rapid determination of sodium formaldehyde sulfoxylate in food additive
  • Method for rapid determination of sodium formaldehyde sulfoxylate in food additive
  • Method for rapid determination of sodium formaldehyde sulfoxylate in food additive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Sample pretreatment: Weigh 1.0g sample into a 150mL Erlenmeyer flask, add 30ml of an aqueous solution containing 10mmol / LKOH, shake at 150rpm for 40min, dilute to 50mL with 10mmol / LKOH aqueous solution, centrifuge at 7800r / min for 10min, Take 10mL of supernatant to pass through the C18 pretreatment cartridge, discard the first 5mL, keep the remaining 5mL sample for injection and detection.

[0016] Chromatographic separation and detection: the chromatographic column is IonPac AS11 chromatographic column 4mm×250mm (with AS11-HG guard column 4mm×50mm), the mobile phase is KOH aqueous solution, and the gradient elution mobile phase is set to: contain OH at the beginning - The concentration is 5mmol / L, containing OH after 16min - The concentration is 25mmol / L, containing OH after 25min - The concentration is 5mmol / L, and the flow rate is stopped after 30 minutes; the elution flow rate: 1.2mL / min; the elution temperature: 30°C; the injection volume: 25uL; Electrode: platin...

Embodiment 2

[0019] The established method was applied to the determination of Diaobaikuai in 54 solid food additives.

[0020] Sample pretreatment: Weigh 0.5g sample into a 150mL Erlenmeyer flask, add 35ml of an aqueous solution containing 20mmol / L NaOH, shake for 40min at 150rpm with an oscillator, dilute to 50mL with an aqueous solution of 20mmol / LNaOH, centrifuge at 7800r / min for 10min, Take 10mL of supernatant to pass through the C18 pretreatment cartridge, discard the first 5mL, keep the remaining 5mL sample for injection and detection.

[0021] Chromatographic separation and detection: the chromatographic column is IonPac AS11 chromatographic column 4mm×250mm (with AS11-HG guard column 4mm×50mm), the mobile phase is NaOH aqueous solution, and the gradient elution mobile phase is set to: contain OH at the beginning - The concentration is 5mmol / L, containing OH after 16min - The concentration is 25mmol / L, containing OH after 25min - The concentration is 5mmol / L, and the flow rate is...

Embodiment 3

[0026] The established method was applied to the determination of Diaobaiku in 110 liquid food additives.

[0027] Sample pretreatment: Weigh 2.0g of sample into a 150mL Erlenmeyer flask, add 30ml of aqueous solution containing 10mmol / L NaOH, shake for 40min at 150rpm with an oscillator, dilute to 50mL with aqueous solution of 10mmol / LNaOH, centrifuge at 7800r / min for 10min, Take 10mL of supernatant to pass through the C18 pretreatment column, discard the first 5mL, keep the remaining 5mL sample for injection and detection.

[0028] Chromatographic separation and detection: the chromatographic column is IonPac AS11 chromatographic column 4mm×250mm (with AS11-HG guard column 4mm×50mm), the mobile phase is KOH aqueous solution, and the gradient elution mobile phase is set to: contain OH at the beginning - The concentration is 5mmol / L, containing OH after 16min - The concentration is 25mmol / L, containing OH after 25min - The concentration is 5mmol / L, and the flow rate is stoppe...

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Abstract

The invention provides a method for rapid determination of sodium formaldehyde sulfoxylate in a food additive. The method is characterized by: using dilute alkali to extract sodium formaldehyde sulfoxylate from a sample, removing impurities, then employing an anion exchange column to conduct separation, adopting an ampere detector to perform detection, carrying out qualitative diagnosis according to retention time, and performing quantification by an external standard technique. Compared with conventional methods, the method has simple pretreatment, needs no distillation, reduces false positives, and has the advantages of good sample stability, high accuracy, less matrix interference, as well as high sensitivity, thus having good promotion value.

Description

technical field [0001] The invention relates to a method for rapidly determining the scalloped lumps in food additives. Background technique [0002] Food is food to safety first. Food safety is directly related to the health and life safety of the general public, the healthy development of the country, and the harmony and stability of the society. Food safety issues have attracted the attention of relevant state departments and consumers. In recent years, a series of major food safety accidents such as Sudan red, clenbuterol, turbot, and melamine were all caused by the illegal use of food additives. The Ministry of Health revised and jointly promulgated the "Hygienic Standards for the Use of Food and Food Additives" (GB2760-2007), which was implemented on June 1, 2008. officially implemented. [0003] Diaobaikuai (chemical name: Diaobaikuai) is a dye discharge agent in the chemical industry. Grain products such as vermicelli, rice noodles, rice noodles, cold noodle, bea...

Claims

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Application Information

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IPC IPC(8): G01N30/02G01N30/06G01N30/88
Inventor 张建平黄朝章邓其馨吴清辉谢卫许寒春苏明亮赵艺强叶仲力白雪平蔡国华赖炜扬
Owner CHINA TOBACCO FUJIAN IND
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