37 results about "Maximum Residue Limit" patented technology

A pesticide application label and maximum residue level checking framework determines whether a crop is safe to be harvested, when it can be harvested, and in which potential export markets the crop can be sold after harvest. The pesticide application label and maximum residue level checking framework includes processes for checking treatment label specifications and rules for maximum residue levels for active ingredients in treatments applied to crops during a growing season. A process for evaluating harvest and regulatory compliance, and a pesticide application label and maximum residue level evaluation system, are also disclosed.

A stored-grain pest pesticide is characterized in that each component by the weight percentage is as follows: star anise oil 0.018-10.0, decamethrin 0.24-8.0, and the rest is carrier material. The inventive pest pesticide with the star anise oil and the decamethrin has obvious pest control effect on grain storage, and the pest control effect on the raw grain and seed storage of paddies, corns, beans, etc. is above 95%. The stored-grain pest pesticide has long lasting period without influence on the germination rate of the stored seeds. With the rich resources of raw materials, simple preparation technology, no waste pollution, convenient and safe usage, and low toxicity of products, the stored-grain pesticide residue meets the standard of WHO/FDA, which is further lower than the maximum residue limit in China.

The invention discloses a visual comparison analysis method and system for multi-region maximum residue limit (MRL) standards. An agricultural product classification tree is constructed by adopting MRL standard data from top to bottom, and correlation comparison analysis, detail comparison analysis, index evaluation comparison analysis and overall comparison analysis are achieved in combination with an interactive technology. The system comprises a user interaction module, a user exploration module, an index calculation module and an index visualization module. LPM indexes include a classification hierarchy number L of agricultural products, a related pesticide number P and a record number M of pesticide limit values in a data set, the LPM indexes are quantitatively calculated through weighting, and the accuracy of comparison analysis is improved; by adopting a nested circle, a radar chart, a parallel coordinate and tag cloud, a polyline-column chart and the interactive technology, thedifference in the strict degree of determining the classification conditions of the agricultural products and the coverage range of the MRL standards of the agricultural products at different regionsis quickly discovered. The visual comparison analysis method and system for the multi-region maximum residue limit (MRL) standards can also be used for visual comparison analysis in other applicationfields of multi-dimensional hierarchical data.

The invention discloses a GC-EI-MS measurement method for fluoride ether bacteria amide residues. The method is mainly used for measuring the content of fluoride ether bacteria amide remaining in a complex matrix food and agricultural products such as cereal grains and animal derived food. The method comprises the following steps: extracting fluoride ether bacteria amide remaining in a sample in a homogenization manner by virtue of acetonitrile or an acetonitrile solution containing 1 percent of acetic acid, performing purification and concentration by virtue of a C18/PSA solid-phase extraction column, performing GC-EI-MS detection, establishing a corrected standard curve by adopting a vehicle solution free of a pesticide to be measured, and measuring the fluoride ether bacteria amide residues according to an external standard method. According to the method, the average recovery rate is 82.5 to 87.4 percent, the average relative standard deviation (RSD) is 4.4 to 6.4 percent, the detection limit is lower than 0.56[mu]g/kg, the method has the advantages of convenience and high speed in operation, good impurity removal effects, high sensitivity, high repeatability and accurate qualification and quantification, the technical requirement of uniform limit of 0.01mg/kg maximum residue limit can be met, and powerful technical support can be provided for ensuring the food safety of Chinese people and the healthy development of foreign export trade.

The invention relates to a technology for controlling or reducing plasticizers in grease and the grease obtained through the same, and belongs to the field of grease processing.According to the technology, the content of phthalate plasticizers in the grease can be reduced to be within the allowed maximum residue limit range by adding amino adsorbing agents and/or specific acid substances.In addition, the technology is easy to implement, the technological processes are simplified, and the cost is saved.

The invention discloses a method for fast detecting residual acetamiprid in fruit peels. The method is characterized in that a surface enhanced Raman spectrometry (SERS) is used for building an SERS standard spectral line of the maximum acetamiprid residual quantity, conforming to the food security national standard GB2763-2014, of fruit to be detected; the fruit peels of the fruit to be detected are detected for obtaining the SERS spectral line of the fruit to be detected; the obtained SERS spectral line is compared with the SERS standard spectral line for judging whether the acetamiprid content in the fruit peels of the fruit to be detected conforms to the food security national standard or not. The method has the characteristics that the pretreatment on the fruit is not needed; no damage is caused on detecting samples; the operation process is simple; the field detection can be realized; the consumption is low, and the like. The detecting method has universality, and can be used for detecting other pesticides or toxic substances on the surfaces of vegetables and fruits with smooth surfaces through proper modification.

The invention provides a method for quick screening and assessment of pesticide residues in tea. The invention provides a microbial method for screening carbamate pesticide residues in tea by using clostridum butyricum WZ001 as a working strain. The size of inhibition zone on a screening medium is employed to determine whether the acephate residues in a food sample to be measured exceeds the standards. The method for quick screening and assessment of pesticide residues in tea has the characteristics of simple operation, low cost, high sensitivity, and suitability for screening sample characteristics, is superior to the current national standards for rapid screening of pesticide residues, fully meets the requirements for maximum residue limit in food of national food safety standards, has good ability of matrix interference resistance, and can effectively avoid false positive results.

The invention discloses a detection method for extracting albendazole compounds from fish flesh. The method comprises the following steps: extraction of homogenized fish flesh with ethyl acetate, purification using n-hexane, acetonitrile concentrating, external standard technology quantification and high performance liquid chromatography-tandem mass spectrometry detection. A technology for rapidlyscreening qualified ethyl acetate is provided to avoid possible impurities which can oxidize albendazole. The detection limits of albendazole sulfoxide, albendazole sulfone and amino albendazole sulfone in the method are 0.27 [mu]g/kg, 0.09 [mu]g/kg and 0.11 [mu]g/kg respectively. The maximum residue limit of albendazole in ruminants in European Union and China is prescribed as follows: the sum of residual markers albendazole sulfoxide, albendazole sulfone and amino albendazole sulfone in a muscle matrix does not exceed 100 [mu]g/Kg. The method is very suitable for detecting the residue of albendazole in the fish flesh, and has the advantages of simplicity, fastness, low cost and high sensitivity.

The invention discloses an HPLC-MS/MS detection method of fluopicolide and metabolic products of fluopicolide. The method comprises the steps of taking and grinding a solid sample (an onion, soil andthe like), adding acetonitrile containing 0.2% formic acid for uniform mixing, performing homogenization through a high-speed homogenization machine, and ultrasound extraction and centrifugation at 20-30 DEG C, taking a supernate, adding the same volume of methanol aqueous solution at a concentration of 50%, performing filtration through a filtration membrane to form liquid to be detected, and qualitatively and/or quantitatively analyzing fluopicolide and the metabolic products M-01 and M-02 of fluopicolide for the liquid to be detected through a high performance liquid chromatography-triple quadrupole tandem mass spectrometer. The method is simple, convenient and easy to operate, and can meet requirements on quick detection and confirmation of a residual quantity of fluopicolide and the metabolic products M-01 and M-02 of fluopicolide in the onion and the soil, and provide a theoretical basis for safe and scientific use of fluopicolide for the onion and establishment of a maximum residue limit of fluopicolide in the onion in China.

The invention discloses a method for detecting the residual quantity of orthocide in vegetables and fruits. The method is realized through the following steps of homogeneously extracting residual orthocide in a sample by using an acetic acid-sodium acetate buffer solution (pH 2.6 to 4.8) and acetone, after a concentrated solution is purified through liquid-liquid extraction and a Florisil solid-phase extraction column (Florisil), detecting the purified concentrated solution through a gas chromatography-electron capture detector (GC-ECD), and quantifying through an external standard method. By using the method, the average recovery rate is 90.1% to 108.6%; the average relative standard deviation (RSD) is 1.5% to 5.5%; the lowest detection limit is 0.005mg/kg; the method has the advantages of good repeatability, high sensitivity, simpleness and convenience in operation and accurate and quick quantification. The technical requirements that maximum residue limits of the orthocide in the fruits and the vegetables are 0.02mg/kg and 0.05mg/kg in European Union and American can be met, and the powerful technical support is provided for guaranteeing the food security of Chinese people and the sound development of export trade abroad.

The invention discloses a method for determining the withdrawal period of aquatic animals in a production state, and relates to the technical field of aquatic drug residues. The method specifically comprises the steps that the aquatic animals are subjected to insect-resistant drug (antibiotic) administration according to an actual production state method, then tissue collection is conducted, and the number of collection time points is not less than 5, and the collection time points comprise the time points lower than the maximum residual limit of insect-resistant drugs (antibiotic) and metabolites; the collected tissue is pretreated, and then the residual quantity of the medicine and metabolites of the medicine is detected; performing data inspection, eliminating abnormal values, calculating 95% percentile of each collection tissue in 95% confidence interval by using software WT1.4, setting the time lower than the maximum residual limit as the withdrawal period of each collection tissue, and determining the maximum value as the withdrawal period of the aquatic animals; the insect-resistant drug is mebendazole, and metabolites of the insect-resistant drug are hydroxymebendazole and aminomebendazole. The method can realize calculation of the withdrawal period of the aquatic animals in the production state, is simple and accurate, and has important popularization and application values.

The invention discloses a method for determining the residue of emamectin benzoate in an aquatic product material and application. The method specifically comprises the steps that a sample is directlyground and homogenized, ethyl acetate is adopted to serve as an extraction solvent, after part of extraction liquid is concentrated to a constant volume, the extraction liquid is purified through a solid-phase extraction column, a liquid chromatogram-tandem mass spectrometer is utilized for detecting, and quantification is conducted by using an external standard method. The invention firstly provides a standard method for detecting the residue of emamectin benzoate in the aquatic product material, and fills up the technical blank of the field. The related coefficient of the regression equation reaches 0.99 or above, the testing minimum is 0.5 microgram/kg, the recycling rate at the 0.5 microgram/kg-5.0 microgram/kg fortified concentration level is 80%-120%. The relative standard deviationin a laboratory is less than or equal to 20%. The method is easy and convenient to operate, the sensitivity is high, the interference resistance is high, qualitative and quantitative operation is conducted scientifically and accurately, and technical support can be provided for related supervision departments in China to make the maximum residue limit of emamectin benzoate in aquatic products.

The invention discloses a method for detecting pyraclostrobin, fluxapyroxad and fluxapyroxad metabolites in peanut kernels and peanut straws, and belongs to the technical field of pesticide residue detection. Pyraclostrobin, fluxapyroxad and fluxapyroxad metabolites in peanut kernel and peanut straw samples are extracted/purified by adopting a dispersive solid-phase extraction mode, and then extracted substances are determined by utilizing a liquid chromatography-tandem triple quadrupole mass spectrometer (LC-ESI-MS/MS). The purpose of accurately, qualitatively and quantitatively detecting pyraclostrobin, fluxapyroxad and fluxapyroxad metabolites in peanut kernel and peanut straw samples is achieved. The detection method provided by the invention is accurate, rapid and effective, the limit of quantitation is lower than the maximum residual limit (MRLs) of pyraclostrobin and fluxapyroxad on peanuts in the national standard, and the method can be applied to supervision of pesticide residues in peanuts.

The invention provides a compound preservative for potato dry rot. The compound preservative comprises, in weight percentage, 0.1-0.5% of chitosan, 0.25-0.75% of citric acid, 0.015-0.035% of thiabendazole and the rest water. The citric acid is firstly added into water in proportion to dissolve, the thiabendazole is secondly added in proportion, the chitosan is thirdly added in proportion, and mixture is uniformly mixed to obtain the compound rot prevention agent, the compound rot prevention agent has the advantages that the compound rot prevention agent is safe in environment, efficient and replaceable, chemical disinfectant consumption is reduced and the like. The relative inhibition rate of the compound preservative for the dry rot is 92.28% or more. By the aid of the compound preservative, the thiabendazole residual amount of potato blocks is lower than maximum residue limit of thiabendazole of commercial potatoes in European standards.