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Gas chromatography for measuring trace ethephon in pear

A technology of gas chromatography and ethephon, which is applied in the field of analysis and detection of harmful trace substances, can solve the problems of low and false positive equipment penetration rate, etc.

Active Publication Date: 2019-01-15
丁立平 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In order to overcome the possible false positive results of the existing headspace gas chromatography in the detection of ethephon in food and the shortcomings of low equipment penetration rate, the technical problem to be solved by the present invention is to provide a fast adsorption method based on a new type of adsorbent dispersed solid phase extraction A gas chromatographic method suitable for the detection of trace ethephon in pears

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  • Gas chromatography for measuring trace ethephon in pear
  • Gas chromatography for measuring trace ethephon in pear
  • Gas chromatography for measuring trace ethephon in pear

Examples

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Embodiment 1

[0069] The present embodiment 1 adopts white pear as sample matrix to carry out standard addition recovery experiment to verify the feasibility of the present invention method, handle according to the following steps:

[0070] 1. Adsorption of compounds:

[0071] Take 5.00g of the muddy sample, add 5.00mL of the above-mentioned standard liquid to it, add 30mL of deionized water, homogenize at 15000rpm for 1min, centrifuge at 4500rpm for 3min, pour the supernatant into another 50mL In a plugged centrifuge tube, add 0.40 g of nitrate-magnesium aluminum hydrotalcite adsorbent to the centrifuge tube, and shake for 10 minutes to make the adsorbent adsorb;

[0072] 2. Desorption of compounds:

[0073] Centrifuge the 50mL stoppered centrifuge tube at 4500rpm for 3min to separate the solid adsorbent from the aqueous solution and discard the supernatant, add 2.00mL of 1-fold diluted hydrochloric acid solution to it, until the solid adsorbent is completely dissolved to achieve the targ...

Embodiment 2

[0082] The present embodiment 2 adopts huanghuali as the sample matrix to carry out the standard addition recovery experiment to verify the feasibility of the method of the present invention, and proceed according to the following steps:

[0083] 1. Adsorption of compounds:

[0084] Take 5.00g of the muddy sample, add 5.00mL of the above-mentioned standard liquid to it, add 30mL of deionized water, homogenize at 15000rpm for 1min, centrifuge at 4500rpm for 3min, pour the supernatant into another 50mL In a plugged centrifuge tube, add 0.40 g of nitrate-magnesium aluminum hydrotalcite adsorbent to the centrifuge tube, and shake for 10 minutes to make the adsorbent adsorb;

[0085] 2. Desorption of compounds:

[0086] Centrifuge the 50mL stoppered centrifuge tube at 4500rpm for 3min to separate the solid adsorbent from the aqueous solution and discard the supernatant, add 2.00mL of 1-fold diluted hydrochloric acid solution to it, until the solid adsorbent is completely dissolved...

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Abstract

The invention relates to a trace substance analysis and detection method, in particular to a gas chromatography for measuring trace ethephon in a pear. The method comprising the following steps of: pulverizing a sample and extracting with deionized water; enriching target compounds in the extracting solution by a new adsorbent nitrate-magnesium-aluminum hydrotalcite; dissolving the adsorbent by anacid to realize complete elution of the target compounds; efficiently extracting the compounds by an organic solvent with low dose; and rapidly analyzing and measuring by the gas chromatography aftera derivatization. The method realizes rapid and efficient adsorption of the target compounds by using the new adsorbent which adopts the method of dispersive solid phase extraction, realizes completeelution of the target compounds by using the acid, uses deionized water to extract and dissolve and only uses a small amount of organic solvent to extract, thereby having significant safety, environmental benefits and economic advantages.

Description

technical field [0001] The invention relates to a method for analyzing and detecting harmful trace substances, in particular to a gas chromatography method for measuring trace ethephon in pears. Background technique [0002] Ethephon is a low-toxic fruit ripening agent, but high concentration and long-term intake of ethephon can also have certain effects on the reproductive system of animals. On September 29, 2017, the European Commission issued Regulation (EU) No. 2017 / 1777, which stipulates the maximum residue limit of ethephon in various fruits, among which the maximum residue limit of ethephon in pear is 0.05mg / kg, which is strictly required . [0003] At present, the main method for the detection of trace ethephon in fruits is gas chromatography, and the main principle of the headspace gas chromatography detection method for ethephon in food is to add lye to the sample and then heat it at a constant temperature to make ethephon in the alkaline medium Rapidly decompose...

Claims

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Application Information

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IPC IPC(8): G01N30/02G01N30/06G01N30/08
CPCG01N30/02G01N30/06G01N30/08G01N2030/062
Inventor 丁立平张睿蔡春平郑麟毅姜晖郑铃郑香平黄菁菁陈志涛
Owner 丁立平