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A gas chromatographic analysis method for determining iodine content in food

A gas chromatographic analysis and gas chromatographic technology, which is used in measurement devices, analytical materials, material separation, etc., can solve the problems of low detection limit in the scope of application, no iodine extraction, only suitable for use, etc., to meet the standard recovery rate, improve Recovery rate, the effect of promoting the oxidative decomposition of organic matter

Active Publication Date: 2016-01-20
INST OF ANALYSIS GUANGDONG ACAD OF SCI (CHINA NAT ANALYTICAL
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such pretreatment ignores the existence of organic iodine in food, and cannot completely extract iodine from food
In addition, the current national standard GB5413.23-2010 uses gas chromatography to determine the content of iodine, but its scope is only applicable to infant food and dairy products. The determination of iodine content in various foods has not been reported in the literature, so it can be combined with samples such as spectrometry. Based on the advantages of the pretreatment method and the sensitivity of the gas chromatography detector, a new method for the determination of iodine in food with a wider application range and a lower detection limit is established to provide a basis for further evaluation of the value and standard of iodine

Method used

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  • A gas chromatographic analysis method for determining iodine content in food
  • A gas chromatographic analysis method for determining iodine content in food
  • A gas chromatographic analysis method for determining iodine content in food

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1, measure the iodine content in 44 kinds of foods.

[0024] 1. Instruments, reagents and instrument working conditions

[0025] (1) Instrument

[0026] Agilent6890N gas chromatograph equipped with electron capture detector (Agilent Corporation, USA); high-temperature energy-saving electric furnace HY-1000°C (Luoyang Hengyu Experimental Electric Furnace Factory); Shengpu experimental electric heating plate HT-300 (China Guangzhou Analysis and Testing Center); ultrasonic Cleaning instrument (Shanghai Luxi Analytical Instrument Co., Ltd.); centrifuge TDZ5-WS (Hunan Sete Xiangyi Technology Co., Ltd.); micro-vortex mixer XW-80A (Shanghai Luxi Analytical Instrument Co., Ltd.); Sartorius electronic balance BSA224S (Guangzhou Shenhua Experimental Instrument Equipment Co., Ltd.).

[0027] (2) Reagents

[0028] Potassium iodide (National Institute for the Identification of Pharmaceutical and Biological Products, 99.5%); Butanone (analytical grade, Tianjin Hongyan C...

Embodiment 2

[0046] Embodiment 2, repeatability and standard addition recovery test.

[0047]Take 6 parts of seaweed as samples, carry out pretreatment and gas chromatography analysis respectively, and calculate the recovery rate according to the added standard amount and the measured value. The average content of iodine in the seaweed is determined to be 11.05 μg / g, and the RSD is 1.74%. The results show that the method Good repeatability. The recovery results are shown in Table 3. It can be seen from Table 3 that the average recovery of iodine in laver samples was 104.6%, and the RSD was 2.98%. The recovery rate of this method can meet the analytical requirements for determining iodine content in food, and is suitable for the analysis of iodine content in food.

[0048] Table 3 The results of the standard recovery experiment

[0049]

[0050]

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Abstract

The invention relates to an analysis method for determining content of iodine in food, and in particular relates to an analysis method for detecting the iodine by utilizing gas chromatography, belonging to the field of analysis chemistry. The gas chromatography method for determining the content of iodine in food is characterized in that a potassium carbonate-zinc sulfate ashing method is used for preprocessing a sample, and the gas chromatography is used for detecting the content of iodine. The gas chromatography method has beneficial effects that 1. the potassium carbonate-zinc sulfate ashing method is used for preprocessing the sample, so that the oxidization decomposition of organic matters can be promoted, organic iodine is converted into inorganic iodine, ashing is thorough, the volatile loss also can be reduced, and the detection recovery rate can be improved; 2. inorganic iodine and organic iodine in the food can be simultaneously determined, and the real content of iodine in the food can be accurately reflected; 3. the application range is wide, and the method is suitable for detecting the iodine in multiple food; 4. the detection limit of the iodine is 2.5ng.g<-1> and is obviously lower than the national standard; 5. the method is good in repeatability, and the labeling recovery rate can meet the analysis and determination requirement.

Description

technical field [0001] The invention relates to an analysis method for detecting iodine content in food, in particular to an analysis method for detection by gas chromatography, which belongs to the field of analytical chemistry. Background technique [0002] Iodine is an essential trace element for the human body. A normal adult contains about 20-50mg of iodine, of which about 70%-80% is mainly concentrated in the thyroid gland. Iodine is the main raw material for the synthesis of thyroid hormones, and its physiological functions can be divided into energy metabolism, substance metabolism and growth and development. In terms of material metabolism and energy metabolism, it not only stimulates the synthesis of deoxyribonucleic acid, protein, and ribonucleic acid, but also participates in the metabolism of vitamins, water, sugar, fat, and salt. The impact on growth and development is mainly manifested in the promotion of protein synthesis and bone growth and development, as ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N30/02G01N30/06
Inventor 林晨王李平方丽林泽鹏吴凌涛李雪莹张方圆蔡大川张志军刘敏钟晨晨陈观娣陈秀敏温才洁
Owner INST OF ANALYSIS GUANGDONG ACAD OF SCI (CHINA NAT ANALYTICAL
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