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Method for rapidly detecting concentration of imazalil in postharvest preservative fresh-keeping liquid for mandarin oranges

A technology of imazalil and fresh-keeping liquid, which is applied in the intersection of chemistry and biology, can solve the problems of expensive instruments and no detection of bactericide concentration, and achieves the effects of low cost, easy operation and guaranteed safety.

Active Publication Date: 2014-12-10
HUAZHONG AGRI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these methods are efficient, highly accurate, and have a wide detection range, they not only require very expensive instruments, but also require professional and technical personnel to operate. This method is currently mainly used for the detection of pesticide residues in fruits, and for common citrus postharvest Commercial processing companies do not have such detection conditions, and there is currently no simple method for real-time and rapid detection of fungicide concentrations in the postharvest preservation process of citrus and other fruits

Method used

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  • Method for rapidly detecting concentration of imazalil in postharvest preservative fresh-keeping liquid for mandarin oranges
  • Method for rapidly detecting concentration of imazalil in postharvest preservative fresh-keeping liquid for mandarin oranges
  • Method for rapidly detecting concentration of imazalil in postharvest preservative fresh-keeping liquid for mandarin oranges

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Embodiment 1

[0027] A method for rapidly detecting the concentration of imazalil in post-harvest antiseptic and fresh-keeping liquid of citrus, the steps are as follows:

[0028] 1. Weigh 0.72g of sodium dodecylbenzenesulfonate (SDS), transfer it into a 250ml volumetric flask, and make a solution of 0.01mol / L with tap water;

[0029] 2. Weigh 0.055g of indophenol blue, transfer it into a 200ml volumetric flask, and dichloromethane to constant volume to prepare a 0.001mol / L solution;

[0030] 3. Prepare 1M dilute sulfuric acid solution;

[0031] 4. Use the fruit and vegetable preservative Wandeli (active ingredient content of imazalil: 500g / L) to prepare a solution with an imazalil content of 1000mg / L, and then dilute it into: 800mg / L, 600mg / L, 400mg / L, 200mg / L, 100mg / L;

[0032] 5. Use a Erlenmeyer flask to measure 20ml of the imazalil solutions of the above six concentration gradients, first add 10ml of dilute sulfuric acid, mix well, then add 20ml of dichloromethane, then drop in 5-10...

Embodiment 2

[0043] Gas chromatography detection is compared with titration method detection result of the present invention

[0044] The water samples in the fungicide system on the production line of the same production area were determined by GC and titration respectively.

[0045] 1. GC determination method:

[0046] The GC determination method refers to (Xu Guofeng et al., Analysis method of 4 kinds of antiseptic preservatives such as procymidone in apple, banana and citrus, Acta Pesticide Science, 2009, 11(3):351-356).

[0047] Standard stock solution: Accurately weigh a certain amount of imazalil (Aladdin, 96%) in a 50ml volumetric flask, acetone (analytical grade, Sinopharm Chemical Reagent Co., Ltd.) is set to 10g / L, then diluted to 1g with acetone / L, 0.9g / L, 0.8g / L, 0.7g / L, 0.6g / L, 0.5g / L, 0.4g / L, 0.3g / L, 0.2g / L, 0.1g / L solutions.

[0048] Chromatographic conditions: HP-5 chromatographic column; carrier gas: high-purity He; flow rate: 1.0mL / min; column temperature 100°C, rise to...

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Abstract

The invention discloses a method for rapidly detecting concentration of imazalil in a postharvest preservative fresh-keeping liquid for mandarin oranges. The method is high in speed, low in cost, simple, easy to operate and suitable for popularization and application in producing regions and enterprises, and has an extensive application prospect. Meanwhile, sodium dodecyl benzene sulfonate and dichloromethane are common and cheap chemicals. Sodium dodecyl benzene sulfonate is a nontoxic chemical agent, and dichloromethane is one of common lowest-toxicity chemical agents in organic reagents, therefore, the safety of the detection method is ensured. According to the method, a titration process is utilized for the first time to detect the concentration of imazalil in a sterilization system on a commercialized-treatment production line of mandarin oranges. Even when the concentration of a titrant is 0.01mol / L, the concentration of imazalil, which is as low as 50mg / L, still can be detected.

Description

technical field [0001] The invention belongs to the cross field of chemistry and biology, and specifically relates to the application of titration method to quickly detect the concentration of imazalil in the rotten fresh-keeping treatment liquid of citrus after harvest. detection. Background technique [0002] Citrus (Citrus) is a citrus plant of the Rutaceae Citrus subfamily and is the largest fruit tree in the world. According to the statistics of the Food and Agriculture Organization of the United Nations (FAO), the world's annual output of citrus has reached 120 million tons in 2011, distributed in 135 countries and regions, and citrus accounts for 20.3% of the world's total fruit output. my country is the main producer of citrus in the world. In 2011, the area of ​​citrus in my country reached 2.29 million hectares, and the output exceeded 29.44 million tons, ranking second only to apples. The output value of citrus is about 40 billion yuan, which can drive 4 to 5 ti...

Claims

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Application Information

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IPC IPC(8): G01N31/16G01N31/22
Inventor 程运江吴萍刘欢罗焘张立
Owner HUAZHONG AGRI UNIV
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