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37 results about "Maximum Residue Limit" patented technology
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The maximum residue limit (also maximum residue level, MRL), is the maximum amount of pesticide residue that is expected to remain on food products when a pesticide is used according to label directions, that will not be a concern to human health.
Method for removing pesticide residues and plasticizer from fructus momordicae extract at the same time
ActiveCN106306991AHigh pesticide residue removal rateNo residueFood mechanical treatmentGaseous food ingredientsLoss rateMomordica
The invention discloses a method for removing pesticide residues and a plasticizer from a fructus momordicae extract at the same time. The method comprises the following steps: (1) extracting the fructus momordicae extract by using supercritical carbon dioxide fluid containing an entrainer, and lowering the temperature and reducing the pressure after extraction until the temperature and the pressure are normal to obtain an initial extract of the fructus momordicae extract; (2) dissolving the initial extract of the fructus momordicae extract in water, and performing nanofiltration to obtain nanofiltration trapped fluid of the fructus momordicae extract; and (3) performing spray drying to obtain the fructus momordicae extract without the pesticide residues and the plasticizer. By use of the method disclosed by the invention, the pesticide residues and the plasticizer in the fructus momordicae extract can be removed at the same time, the removal rate of the pesticide residues can reach 88.94%, the removal rate of the plasticizer can reach 92.54%, the indexes of the residual quantities can reach the latest national standard GB2763-2014 'Maximum Residue Limits of Pesticides in Food', and the loss rate of momordica glycoside V in the fructus momordicae extract is 0. The method disclosed by the invention is simple, low in cost, safe and environment-friendly, and contains no residues of chemical reagents.
Owner:HUNAN HUACHENG BIOTECH
Pesticide and crop treatment application label and maximum residue level compliance checking system and method
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.
Owner:AGRIAN INC
Deltamethrin and badian oil insecticidal composition
InactiveCN101248804ANo effect on germinationRich sourcesBiocideFood preservationDeltamethrinMaximum Residue Limit
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.
Owner:广西钦州谷虫净总厂
Visual comparison analysis method and system for multi-region MRL standards
ActiveCN108280191AHigh precisionEasy to operateMulti-dimensional databasesSpecial data processing applicationsData setLimit value
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.
Owner:BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
Detection method for residual quantity of cyanamide in fruits
InactiveCN107462646AReduce distractionsEasy to operateComponent separationEthyl acetateMaximum Residue Limit
The invention relates to a detection method for the residual quantity of cyanamide in fruits. The detection method comprises the following specific steps: (1) standard curve drawing; (2) sample extraction; (3) concentrated solution derivation; (4) recovery rate measurement; (5) sample cyanamide content measurement. According to the detection method for the residual quantity of cyanamide in fruits, anhydrous sodium sulfate is used for removing water, ethyl acetate is extracted, after an extracting solution is concentrated, purification is avoided, the cyanamide can be directly derived with dansyl chloride, and the test operation is simple and convenient. By adopting a liquid chromatography tandem mass spectrometry multi-reaction monitoring mode, the detection method has relatively high selectivity and sensitivity, the interference of impurities can be effectively reduced, the detection method has relatively high accuracy and precision, and maximum residue limit is decided and technical support is provided for completing and supplementing cyanamide dietary intake and risk data of residents in next step.
Owner:SHANDONG YANTAI AGRI SCI & TECH INST
GC-NCI-MS (gas chromatography-negative chemical ionization-mass spectrometry) testing method of residual quantity of cyantraniliprole
ActiveCN104502508AAvoid matrix interferenceSimple and fast operationComponent separationMatrix solutionRelative standard deviation
The invention discloses a GC-NCI-MS (gas chromatography-negative chemical ionization-mass spectrometry) testing method of residual quantity of cyantraniliprole. The method is mainly used for testing the content of cyantraniliprole remained in complex matrix food agricultural products such as cereal grains and animal-origin food. The method comprises the following steps: homogenously extracting cyantraniliprole remained in samples by using acetonitrile or acetonitrile solutions containing 1 percent of acetic acid; purifying and condensing by using a C18 / PSA solid-phase extraction column; detecting by GC-NCI-MS; building a corrected standard curve by using vehicle solutions which do not contain pesticides to be detected; and quantifying by using an external standard method. The method has the average recycling rate of 93.4-97.7 percent, the average relative standard deviation (RSD) of 4.0-7.3 percent and the detection limit of lower than 2.89 microgram / kg, has the advantages of convenience and quickness in operation, good impurity removal effect, high sensitivity, high property, high repeatability and accurate quantitativeness and qualitativeness, and can meet the technical requirement of uniform limit, namely 0.01 mg / kg maximum residue limit of corresponding food security detection, in America, Canada, European Union, Japan and the like, so that powerful technical support is provided for guaranteeing food security of people and healthy development of export trade in China.
Owner:INSPECTION & QUARANTINE TECH CENT SHANDONG ENTRY EXIT INSPECTION & QUARANTINE BUREAU
GC-EI-MS measurement method for fluoride ether bacteria amide residues
ActiveCN104678043AAvoid matrix interferenceSimple and fast operationComponent separationRelative standard deviationVapor phase chromatography
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.
Owner:郭庆龙
Sensor for detection of dithiocarbamate pesticides and preparation and application thereof
ActiveCN106198506AQuick checkHigh detection sensitivityMaterial analysis by observing effect on chemical indicatorColor changesMaximum Residue Limit
The invention relates to a sensor used for highly-sensitive and rapid detection of dithiocarbamate pesticides and preparation and application thereof. According to the principle of the method, characteristic group C=S of a dithiocarbamate pesticide and an indicator rapidly undergo an oxidation-reduction reaction at normal temperature such that the indicator changes in color. Thus, the sensor has high sensitivity in the coexistence of various pesticides. In addition, there is a good linear relation between color change of the indicator and pesticide concentration. By immobilizing the indicator onto a porous material, low-concentration pesticides can continuously react with the indicator by an enrichment mode, thus greatly raising detection sensitivity. The detection limits of two pesticides dazomet and zineb both can meet the international and domestic standard requirements of the maximum residue limit of dithiocarbamate pesticides. The sensor is suitable for spot rapid detection of the pesticides.
Owner:中科(大连)快检科技有限公司
Technology for controlling or reducing plasticizers in grease and grease obtained through same
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.
Owner:WILMAR SHANGHAI BIOTECH RES & DEV CENT
Process for preparing copolyester soybean esterase
The invention relates to the preparing method of soybean exterase which can be used in the detection of the vegetable and fruits' pesticide residue. The producing procedure comprises the following steps: choosing the high-quality soybean, pulverizing, extracting with phosphate buffer, differential centrifugation separating, salt precipitating by ammonium, purifying by ion exchange chromatography and freeze-drying. The invention has a simple and steady producing technology. It also costs less than the method of extracting pure acetylcholine exterase products. The purified product's sensitivity is more than 19 times as the sensitivity of the enzyme crude extracts. The LDC of monocrotophos, methamidophos, alkron, durshan, dantox, carbofos and chlorofos has reached 0.03125ppm. The LDC of dursan and methidathion is one thirty-second of their MRL, while the LDC of diethion, alkron and Phosalone is one sixteenth of their MRL. The invention can fill the needs of fast detection of phosphate pesticide; it can also be widely used as the enzyme labeling marker in different methods of detecting the pesticide residue.
Owner:SHAANXI NORMAL UNIV
Method and device for judging sample qualification in risk monitoring information system
The invention discloses a method and a device for judging sample qualification in an agricultural product quality safety risk monitoring information system, which relate to the field of agricultural product quality safety. The method comprises steps: a detected target sample name, each target detection item corresponding to the target sample name and each detection result corresponding to each target detection item are received; according to a pre-configured corresponding relationship among the sample name, the detection item and the maximum residue limit, each maximum residue limit corresponding to the target sample name and each target detection item is searched; each detection result is compared with each maximum residue limit to obtain a comparison result; and according to the comparison result, the target sample is judged to be qualified in conditions in which each detection result is smaller than or equal to each maximum residue limit. Thus, the sample judgment accuracy can be improved, and the workload caused by using a paper form can be avoided.
Owner:INST OF QUALITY STANDARD & TESTING TECH FOR AGRO PROD OF CAAS
Method for fast detecting residual acetamiprid in fruit peel
ActiveCN105954259AFree from destructionUniversalRaman scatteringSurface-enhanced Raman spectroscopyToxic material
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.
Owner:HEFEI UNIV OF TECH
Method for quick screening and assessment of pesticide residues in tea
ActiveCN106222235AIncreased sensitivityStrong specificityMicroorganismsMicrobiological testing/measurementInhibition zoneInterference resistance
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.
Owner:WENZHOU MEDICAL UNIV
Data associative access method based on three-dimensional table structure and application
ActiveCN107066573AImprove the efficiency of accessing dataSave storage spaceData processing applicationsSpecial data processing applicationsAccess methodData access
The invention discloses a data associative access method based on a three-dimensional table structure and an application. The method is used for achieving high-efficiency data access operation of a management system. According to the data associative access method, two storage spaces, namely a low level storage space and a high level storage space, are designed in addition to a conventional storage space for storage equipment of the management system, and used for storing a Hash table and calculating mapping data by using a Hash function; when a user sends an inquiry request, the data associative access method resolves the request sent by the user, and achieves inquiry reading operation or inquiry storage operation via associative operation of multiple database tables; and high-efficiency data access of the management system is achieved. The method is applied to a pesticide residue data management system, achieves effective management of pesticide information, agricultural product information, and data of multiple associative tables of MRL (maximum residue limit) standard information of multiple countries or regions, and greatly increases an access speed.
Owner:BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
Detection method for extracting albendazole compounds from fish flesh
InactiveCN108828082ASimplify preprocessing stepsReduce polarityComponent separationAcetic acidEthyl ester
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.
Owner:CENT SOUTH UNIV
HPLC-MS/MS detection method of fluopicolide and metabolic products of fluopicolide
ActiveCN108593830AThe method is simpleEasy to operateComponent separationFiltration membraneMetabolite
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.
Owner:INST OF QUALITY STANDARDS & TESTING TECH FOR AGRO PROD OF SHANDONG ACADEMY OF AGRI SCI
Method for detecting residual quantity of orthocide in vegetables and fruits
ActiveCN104807937AHigh sensitivityGood repeatabilityComponent separationSodium acetateRelative standard deviation
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.
Owner:INST OF PLANT PROTECTION SHANDONG ACAD OF AGRI SCI
Determination method for withdrawal period of aquatic animals in production state
PendingCN114371238AThe method is simple and accurateOther chemical processesComponent separationAminomebendazoleMetabolite
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.
Owner:YANGTZE RIVER FISHERIES RES INST CHINESE ACAD OF FISHERY SCI
A method for rapid detection of residual acetamiprid in fruit peel
ActiveCN105954259BFree from destructionUniversalRaman scatteringSurface-enhanced Raman spectroscopyFood safety
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.
Owner:HEFEI UNIV OF TECH
Method for determining residue of emamectin benzoate in aquatic product material
ActiveCN108982701AEasy to operateEasy to handleComponent separationRelative standard deviationSolid phase extraction
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.
Owner:INSPECTION & QUARANTINE TECH CENT OF GUANGDONG ENTRY EXIT INSPECTION & QUARANTINE BUREAU
Method for detecting pyraclostrobin, fluxapyroxad and fluxapyroxad metabolites in peanut kernels and peanut straws
PendingCN113848270AImprove accuracyImprove stabilityComponent separationMaterial analysis by electric/magnetic meansMetaboliteMass analyzer
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.
Owner:INST OF ZOOLOGY CHINESE ACAD OF SCI
A data association access method and application based on three-dimensional table structure
ActiveCN107066573BImprove the efficiency of accessing dataSave storage spaceData processing applicationsSpecial data processing applicationsData accessData management
The invention discloses a data associative access method based on a three-dimensional table structure and an application. The method is used for achieving high-efficiency data access operation of a management system. According to the data associative access method, two storage spaces, namely a low level storage space and a high level storage space, are designed in addition to a conventional storage space for storage equipment of the management system, and used for storing a Hash table and calculating mapping data by using a Hash function; when a user sends an inquiry request, the data associative access method resolves the request sent by the user, and achieves inquiry reading operation or inquiry storage operation via associative operation of multiple database tables; and high-efficiency data access of the management system is achieved. The method is applied to a pesticide residue data management system, achieves effective management of pesticide information, agricultural product information, and data of multiple associative tables of MRL (maximum residue limit) standard information of multiple countries or regions, and greatly increases an access speed.
Owner:BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
A kind of detection method of residual amount of cyanamide in fruit
InactiveCN107462646BReduce distractionsEasy to operateComponent separationBiotechnologyEthyl acetate
The invention relates to a detection method for the residual quantity of cyanamide in fruits. The detection method comprises the following specific steps: (1) standard curve drawing; (2) sample extraction; (3) concentrated solution derivation; (4) recovery rate measurement; (5) sample cyanamide content measurement. According to the detection method for the residual quantity of cyanamide in fruits, anhydrous sodium sulfate is used for removing water, ethyl acetate is extracted, after an extracting solution is concentrated, purification is avoided, the cyanamide can be directly derived with dansyl chloride, and the test operation is simple and convenient. By adopting a liquid chromatography tandem mass spectrometry multi-reaction monitoring mode, the detection method has relatively high selectivity and sensitivity, the interference of impurities can be effectively reduced, the detection method has relatively high accuracy and precision, and maximum residue limit is decided and technical support is provided for completing and supplementing cyanamide dietary intake and risk data of residents in next step.
Owner:SHANDONG YANTAI AGRI SCI & TECH INST
A kind of detection method of sodium nitrophenolate residue in fruits and vegetables
ActiveCN109541114BSimple and fast operationHigh sensitivityComponent separationBiotechnologyFluid phase
The invention relates to a method for detecting residue of compound sodium nitrophenolate in fruits and vegetables. The method comprises the following specific steps: (1) drawing a standard curve; (2)extracting a sample; (3) purifying; (4) measuring the recovery rate; and (5) measuring the content of the compound sodium nitrophenolate in the sample. According to the method for detecting residue of compound sodium nitrophenolate in fruits and vegetables, acetonitrile is used for extracting, and an extracting solution is purified by an amino solid phase extraction column and determined on a machine. The detection method is easy and convenient to operate. A multi-reaction monitoring mode in which a liquid-phase spectrum is in series connection with a mass spectrum is adopted, so that relatively high selectivity and sensitivity are achieved; impurity interference can be lowered effectively; higher accuracy and precision can be achieved; and technical support is provided for the further improvement and supplementation of the dietary intake of compound sodium nitrophenolate by residents and risk data as well as formulation of maximum residue limit.
Owner:SHANDONG YANTAI AGRI SCI & TECH INST
A Quantitative Evaluation Method for the Completeness of the Standards for Maximum Residue Limits of Pesticides in Agricultural Products
The invention discloses a quantitative evaluation method for the completeness of the maximum residue limit standard of pesticides in agricultural products. By constructing a hierarchical tree for the pesticide residue data set, performing weighting processing, establishing an evaluation index IMS, and obtaining the weight value of the nodes between the weighted hierarchical trees ; Comparing and evaluating the establishment of the maximum residue limit standard MRL for pesticide residues in agricultural products through the node weight value.
Owner:BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
Compound preservative for potato dry rot
InactiveCN107006488ANo pollution in the processBroad-spectrum antimicrobial activityBiocideFungicidesFungicidePreservative
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.
Owner:GANSU AGRI UNIV
Process for preparing copolyester soybean esterase
Owner:SHAANXI NORMAL UNIV
A kind of gc-nci-ms assay method of cyantraniliprole residue
ActiveCN104502508BAvoid matrix interferenceSimple and fast operationComponent separationMatrix solutionRelative standard deviation
The invention discloses a GC-NCI-MS (gas chromatography-negative chemical ionization-mass spectrometry) testing method of residual quantity of cyantraniliprole. The method is mainly used for testing the content of cyantraniliprole remained in complex matrix food agricultural products such as cereal grains and animal-origin food. The method comprises the following steps: homogenously extracting cyantraniliprole remained in samples by using acetonitrile or acetonitrile solutions containing 1 percent of acetic acid; purifying and condensing by using a C18 / PSA solid-phase extraction column; detecting by GC-NCI-MS; building a corrected standard curve by using vehicle solutions which do not contain pesticides to be detected; and quantifying by using an external standard method. The method has the average recycling rate of 93.4-97.7 percent, the average relative standard deviation (RSD) of 4.0-7.3 percent and the detection limit of lower than 2.89 microgram / kg, has the advantages of convenience and quickness in operation, good impurity removal effect, high sensitivity, high property, high repeatability and accurate quantitativeness and qualitativeness, and can meet the technical requirement of uniform limit, namely 0.01 mg / kg maximum residue limit of corresponding food security detection, in America, Canada, European Union, Japan and the like, so that powerful technical support is provided for guaranteeing food security of people and healthy development of export trade in China.
Owner:INSPECTION & QUARANTINE TECH CENT SHANDONG ENTRY EXIT INSPECTION & QUARANTINE BUREAU
A Rapid Screening and Evaluation Method for Pesticide Residues in Tea
ActiveCN106222235BIncreased sensitivityStrong specificityMicroorganismsMicrobiological testing/measurementInhibition zoneMaximum Residue Limit
The invention provides a method for quickly screening and evaluating pesticide residues in tea. Butyric acid bacillus WZ001 is used as a working strain to screen the microbial method of carbamate pesticide residues in tea. Determine whether the residual amount of acephate in the food sample to be tested exceeds the standard according to the size of the inhibition zone on the screening medium. The method provided by the invention for screening carbamate pesticide residues in tea has the characteristics of simple operation, low cost, high sensitivity, and is suitable for sample screening, is superior to the current national standards for rapid screening of pesticide residues, and fully meets the national food safety standards Requirements for the maximum residue limits of pesticides in food, and has a good ability to resist matrix interference, which can effectively avoid the occurrence of false positive results.
Owner:WENZHOU MEDICAL UNIV
Process for controlling or reducing plasticizers in fats and oils obtained therefrom
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.
Owner:WILMAR SHANGHAI BIOTECH RES & DEV CENT
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