Method for detecting sulfite in food

A sulfite and detection method technology, which is applied in measuring devices, instruments, scientific instruments, etc., can solve the problems of complex sulfite detection methods, generation of harmful substances, poor detection accuracy, etc., and achieves a wide detection range, simple operation, Good applicability

Inactive Publication Date: 2020-06-26
安徽国泰众信检测技术有限公司
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  • Abstract
  • Description
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Problems solved by technology

[0005] In the prior art, the detection method of sulfite in food is relatively complicated, the detection cost is high, the detection accuracy is poor, and harmful substances will be produced during the detection process

Method used

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Embodiment Construction

[0016] The preferred embodiments of the present invention are described in detail below, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, so as to define the protection scope of the present invention more clearly.

[0017] The invention provides a method for detecting sulfite in food, comprising the steps of:

[0018] (1) Weigh 10-100g sample, put it in a 1000mL distillation bottle, add about 400mL water, add 1-10g defoamer, 100mL10% hydrochloric acid;

[0019] (2) Heating the distillation bottle, cooling the evaporated water with a spherical condenser, and blowing nitrogen into the bottom of the distillation bottle at the same time;

[0020] (3) Absorb the nitrogen gas overflowing from the upper end of the condenser with an appropriate amount of hydrogen peroxide;

[0021] (4) After properly diluting the absorption liquid, use an ion chromatograph to determine the sulfate content;

[0022] (5) Calculate ...

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Abstract

The invention relates to a method for detecting sulfite in food, and the method comprises the following steps: weighing a proper amount of sample, putting the sample into a distillation flask, addingwater, and adding a defoaming agent and hydrochloric acid; heating the distillation flask, cooling water evaporated by reflux by using a spherical condenser, and blowing nitrogen into the distillationflask near the bottom at the same time; absorbing nitrogen overflowing from the upper end of the condenser by using a proper amount of hydrogen peroxide; properly diluting the absorption liquid, anddetermining the content of sulfate radicals by using an ion chromatograph; and calculating the content of sulfite in the sample according to the measured value of sulfate radical. The method has the advantages of safety, no pollution, clean absorption liquid, no need of retreatment, simple work flow, high sensitivity, accurate quantification, overcoming of many defects of national standard methods, good applicability, simple operation, accurate detection result, no use of lead-containing reagents, and environmental protection.

Description

Technical field: [0001] The invention relates to the technical field of food detection, in particular to a method for detecting sulfite in food. Background technique: [0002] Sulfite is a kind of food additive that has been widely used in the world for a long time: it can be used as food bleaching agent and preservative; it can inhibit non-enzymatic browning and enzymatic browning, prevent food browning, and keep fruits from black It can also prevent fresh shrimp from forming black spots; it is also a very effective antibacterial agent in acidic medium. [0003] For the human body, sulfite ions are originally the products of the metabolism of sulfur-containing amino acids. Therefore, there are sulfite oxidases in the body that can oxidize them. The most abundant sulfite oxidases are in the liver. It is also distributed in the lungs and lungs, and also exists in the mitochondria of cells. It is an essential enzyme for the human body. [0004] When a person takes 1g of sulf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/96
CPCG01N30/96
Inventor 陈洪周姚杰李先锋
Owner 安徽国泰众信检测技术有限公司
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