4results about How to "Improve pretreatment efficiency" patented technology

This invention belongs to the technical field of bactericide residue analysis and determination in plant-derived foods, specifically relating to a method for detecting isobutylethoxyquinoline and its metabolites in plant-derived foods. The method includes extraction with acetonitrile under citrate conditions, followed by purification with C18 (25 mg), PAX (25 mg), and XFM64 (nitrogen-doped multi-walled carbon nanotubes, 10 mg) adsorbents. Chromatographic separation is performed using a C18 column with methanol-2 mmol / L ammonium acetate (containing 0.1% formic acid) as the mobile phase, isocratic elution at a flow rate of 0.40 mL / min, electrospray ionization (ESI+), and detection in multiple reaction monitoring (MRM) mode. This invention is simple to operate, has high pretreatment efficiency, and its precision and recovery rate meet the regulatory residue limit monitoring requirements. It is suitable for the simultaneous determination of isobutylethoxyquinoline and its metabolites in plant-derived foods.

This invention discloses a pesticide residue detection sample oscillation extraction device with solid-liquid separation function, relating to the field of detection equipment. When extracting pesticide residue samples using this device, the sample to be tested is placed in a combined testing cylinder, and a clamping and positioning component clamps the lower clamping plate. A motor drives a rotating plate, a placement cylinder, and the combined testing cylinder to rotate via a telescopic cylinder. Because the lower clamping plate is wavy and annular, the rotating plate vibrates up and down, and the combined testing cylinder vibrates along with the plate, ensuring that the substances in the sample are fully dissolved in the solvent within the combined testing cylinder. When solid-liquid separation is required, the clamping and positioning component is moved to another slot, clamping the upper clamping plate. Because the upper clamping plate is circular and annular, the rotating plate drives the combined testing cylinder to rotate at high speed, achieving solid-liquid separation through high-speed centrifugal force.

The utility model discloses a kind of adsorption foamed plastic pretreatment device, belong to foamed plastic processing equipment technical field, a kind of adsorption foamed plastic pretreatment device, including base, the base top is fixedly connected with soaking pool and mounting bracket, and mounting bracket is located at the side of soaking pool, the top of the soaking pool is fixedly connected with support frame, the top of the support frame is fixedly connected with top plate, the top of the top plate is installed with multiple lifting cylinders, the output end of the lifting cylinder extends to soaking pool, it can effectively solve the problem of traditional foamed plastic pretreatment process manual operation labor intensity, processing efficiency is low, and semi-automatic equipment structure is complex, function is single, process is not smooth, resulting in the problem of low production efficiency and production cost increase, realize from foamed plastic raw material automatic soaking, draining to the integrated pretreatment process of transfer, reduce manual intervention, improve overall processing efficiency, meet the demand of large-scale production.

The invention discloses a plant sample centrifugation-free pretreatment method for magnetic particle-assisted solid-liquid rapid separation, which comprises the following steps: adding magnetic particles into a plant sample extraction system, and fully combining the magnetic particles with insoluble solids under the action of vortex mixing and / or ultrasonic treatment to obtain a plant sample solid-liquid separation solution; then, solid-liquid rapid separation is achieved under the action of an external magnetic field, clear supernate is obtained, and the sample pretreatment process does not need to be completed through traditional centrifugal operation. The method does not depend on high-speed centrifugal equipment, is simple and convenient to operate and short in treatment time, and is particularly suitable for powdery or sticky plant samples. The obtained sample extracting solution can be directly used for gas chromatography-mass spectrometry or liquid chromatography-mass spectrometry analysis, and the analysis result has good consistency with that of a traditional centrifugal method. The method can effectively reduce the dependence on centrifugal equipment, simplify the sample pretreatment process and improve the pretreatment efficiency of complex plant samples, and is suitable for rapid detection and quality control of traditional Chinese medicines, spices, foods and other plant source samples.