Method for removing pesticide residues from tea leaves through high-energy X-ray irradiation

A technology of pesticide residues and ray irradiation, applied in food science, tea treatment before extraction, etc., can solve problems such as difficult implementation in tea plantations, no commercial value, and tea is not durable to storage

Inactive Publication Date: 2017-09-29
四川治生科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The above methods have a certain effect on the removal of pesticide residues in tea, but there are certain limitations. Improving pesticide application methods from the source requires extremely high requirements for tea planting workers, and standardized planting techniques are not easy to implement in tea plantations. Pests and diseases and increasing the yield of tea will use a large amount of pesticides, resulting in the pesticide residues in the tea harvested in our country greatly exceeding the standard, causing adverse effects on people's health
Use solvent washing to remove pesticide residues in tea leaves. The solvent used is mainly water, which can only rem

Method used

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  • Method for removing pesticide residues from tea leaves through high-energy X-ray irradiation

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Experimental program
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Effect test

Embodiment 1

[0027] Example 1: The 7-day-old tea leaves applied with beta-cyfluthrin pesticide were picked normally, and the fresh tea leaves were roasted green, and the water content was controlled at more than 15%. Put the fried green tea into a food-grade polyethylene plastic bag, put a GEX B3 radiochromic film dosimeter (or phenylalanine dosage film) in the bag, seal it and put it into a carton of 500×500×200mm (length, width and height) Inside, it was irradiated with an X-ray beam with an energy of 7 MeV and a beam current of 5 mA. Since a single carton is irradiated, the carton full of tea leaves is fixed under the X-ray beam for irradiation. After the cumulative irradiation dose is 250kGy, it is removed from the X-ray.

[0028]After standing for 1 day, carry out the detection of pesticide residues according to the test method of GB 2763-2016, first carry out quantitative detection with a rapid pesticide detection instrument, and then carry out precise detection with liquid chromatog...

Embodiment 2

[0029] Embodiment 2: the tea tree that has applied imidacloprid according to the normal dosage is picked fresh tealeaves after 7 days, and water content is not less than 15%, carries out irradiation according to the method of the present invention (with the conveying speed of 1-3m / min through irradiation According to the room, with the energy of 5-10MeV, beam current is 4-7mA high-energy X-rays irradiate), different doses of radiation, respectively 150kGy, 200kGy, 300kGy, 350kGy, 400kGy and other doses, the same as example 1 In the post-processing method, sampling, sample preparation, and testing, it was found that with an irradiation dose of 350kGy, the detection value of imidacloprid was 0.28±0.019mg / kg, which met the limit requirement of 0.5mg / kg in GB2763-2016.

Embodiment 3

[0030] Embodiment 3: With the fully processed tea leaves such as Dahongpao of oolong tea, Chuanhong of black tea, Anhua black tea of ​​black tea, etc., the water content is in the range of 2-4%, spraying imidacloprid and beta-cyfluthrin respectively Pesticides such as , buprofezin, place more than 7 days, preferably 10 days, irradiate according to the inventive method (passing through the irradiation chamber with the transmission speed of 2m / min, with energy being 7MeV, beam current being 5mA high-energy X- ray irradiation), doses such as 150kGy, 200kGy, 300kGy, 350kGy, 400kGy respectively, and then sampling, sample preparation, and detection by the method of example 1. The results show that the X-ray beam with an energy of 7 MeV and a beam current of 5mA is less effective in removing residues in dry finished tea than in semi-finished tea with high water content, especially for the removal of imidacloprid and buprofezin. The effect is even worse. Therefore, the method for rem...

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Abstract

The invention discloses a method for removing pesticide residues from tea leaves through high-energy X-ray irradiation. The method is characterized by sequentially comprising the following steps of (1) carrying out pretreatment, fixation or withering on picked fresh tea leaves according to a conventional method; (2) uniformly putting the fixed or withered tea leaves on a conveyor belt under a natural condition, passing through an irradiation room at a conveying speed of 1-3m/min, irradiating by using a high-energy X-ray of which the energy is 5-10MeV and the beam is 4-7mA and making the cumulative irradiation dose on the tea leaves output from the irradiation room reach 200-400kGy; and (3) carrying out subsequent treatment on the tea leaves output from the irradiation room according to the conventional method to obtain the finished tea leaves from which the pesticide residues are removed. The method has the advantages that irradiation is carried out when the moisture content of fresh tea leaves after being fixed or withered is not smaller than 15%, so that the pesticide residue removal effect of the method is much better than that of irradiation of dry tea leaves; and compared with a cobalt-60 gamma ray, the high-energy X-ray is lower in irradiation shielding requirements and has radioactivity when electrified.

Description

technical field [0001] The invention relates to a technique for irradiating tea leaves with high-energy X-rays, in particular to removing pesticide residues and other toxins harmful to human health in tea leaves at room temperature to meet the requirements of relevant standards. Background technique [0002] Tea is loved by people as a healthy drink. my country is a big country in tea production, processing, consumption and export. In 2015, my country's tea output reached 838,000 tons. In the process of tea planting, in order to promote the germination rate of tea and reduce pests and diseases, tea farmers usually use a variety of pesticides for insect control operations, such as buprofezin, imidacloprid, fenvalerate, cypermethrin, bifenthrin, fenpropathrin, Pesticides such as atrazine, pyridaben, procymidone, dimethoate, and prochloraz lead to pesticide residues in the harvested raw tea and tea leaves for end-use consumption, and long-term drinking will cause harm to human...

Claims

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Application Information

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IPC IPC(8): A23F3/06A23L5/20A23L5/30
CPCA23F3/06A23L5/20A23L5/30
Inventor 王新翁亚琳罗媛元孙阎军
Owner 四川治生科技有限公司
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