8results about How to "Short retention time" patented technology

The invention belongs to the field of substance content detection, and discloses a method for determining the content of soybean phosphatidylcholine or phosphatidylethanolamine in a soft capsule, which comprises the following steps: (1) preparing a soybean phosphatidylcholine or phosphatidylethanolamine standard solution; (2) preparing a to-be-detected sample solution; (3) performing high performance liquid chromatography analysis; (4) drawing a standard curve; and (5) calculating the content of soybean phosphatidylcholine or phosphatidyl ethanolamine. The method has the advantages of high response value, short retention time and stable base line, and is not interfered by other components in the soft capsule; the method has the advantages of simple operation, high precision and good repeatability, the recovery rate meets the analysis requirement, and the method can efficiently, quickly and accurately detect the content of two components, namely soybean phosphatidylcholine and phosphatidyl ethanolamine, of soybean phospholipid in the soft capsule content.

The invention discloses a method for detecting the content of lacosamide particles through high performance liquid chromatography, and belongs to the technical field of detection and analysis. The method for detecting the content of lacosamide particles by high performance liquid chromatography comprises the following steps: respectively injecting a reference solution and a test solution into a liquid chromatograph, recording chromatograms, and calculating the content of lacosamide by peak area according to an external standard method. The method solves the problem of poor linearity and repeatability during lacosamide particle content detection, has remarkable advantages, and fills the blank of lacosamide particle content detection in China. Besides, the method is simple and easy to operate, good in specificity, high in precision and sensitivity, stable, reliable and good in durability, various chromatographic conditions are matched with one another, and the method can be used for quality control of the lacosamide particles and is suitable for industrial production.

This invention provides a system for reverse heating of the pretreatment phase in an anaerobic fermentation apparatus, comprising a manure pretreatment unit, a primary anaerobic unit, a tertiary anaerobic unit, and a solid-liquid separation unit arranged sequentially; and a first heat recovery reverse heating unit and a second heat recovery reverse heating unit. One end of the first heat recovery reverse heating unit is connected to a boiler or generator, and the other end is connected to the primary anaerobic unit and the manure pretreatment unit, to utilize the heat from the boiler or generator for heating. One end of the second heat recovery reverse heating unit is connected to the tertiary anaerobic unit, and the other end is connected to the manure pretreatment unit, to utilize the heat from the materials in the tertiary anaerobic unit for heating. This invention utilizes the heat from the materials for reverse heating, which not only increases gas production but also raises the manure pretreatment temperature, thus better serving anaerobic fermentation.

The invention discloses a wastewater treatment device and process for a garbage transfer station, comprising a homogenizing tank, an integrated oil-separating anoxic tank, an integrated anaerobic tank, an integrated anoxic tank, a first integrated aerobic tank, a second integrated aerobic tank, a third integrated aerobic tank, an integrated water production tank, an ultraviolet disinfection device, a sludge temporary storage tank and a deodorizing device. The invention is suitable for wastewater treatment. The device of the invention has a compact structure, a small footprint, and a low cost. The wastewater has a short residence time between various structures, is not easy to precipitate, has a fast treatment speed, and is highly efficient. The process of the invention can ensure the sludge balance in various treatment tanks, and thus can avoid the accumulation of salt, so that the entire system can operate for a long time.

The invention belongs to the technical field of chemical analysis and detection, and particularly relates to a method for distinguishing fatty alcohol-polyoxyethylene ether carboxylic acid prepared by an oxidation method and fatty alcohol-polyoxyethylene ether carboxylic acid prepared by a carboxymethylation method. According to the principle, the fatty alcohol-polyoxyethylene ether carboxylic acid product prepared by using two methods has different residual impurities, and the content of monochloroacetic acid and chloride ion impurities is determined by using an ion chromatography so as to identify the fatty alcohol-polyoxyethylene ether carboxylic acid product. The method is easy and convenient to operate, high in accuracy and precision and good in repeatability, and reliable technical support is provided for quality control and application and popularization of fatty alcohol-polyoxyethylene ether carboxylic acid products.

The present disclosure provides a compound targeting prostate specific membrane antigen (PSMA), wherein the compound has the following structure shown in Formula (I); R1 is a compound structure targeting prostate specific membrane antigen; L1 is -(X)n-(CH2)m-(Y)q-, X and Y are independently selected from lysine, glutamic acid or a derivative structure containing lysine and glutamic acid, n is an integer from 0 to 12, m is an integer from 0 to 60, q is an integer from 0 to 12, and each CH2 may be individually substituted with -O-, -NH(CO)-, or -(CO)-NH-; L2 is -(CH2)p-, p is an integer from 0 to 30, and each CH2 may be individually substituted with -O-, -NH(CO)-, or -(CO)-NH-; and R2 is a nuclide chelating group. The present disclosure also provides a radiolabeled complex based on the structure of the compound. The compound and the radiolabeled complex have appropriate blood circulation time, high uptake in tumors and long retention time, and are suitable for nuclide therapy and imaging of tumors with high expression of PSMA.

The invention discloses plasma water treatment equipment and method, and the equipment comprises a housing which is provided with a water inlet pipe and a water outlet pipe; the multiple metal conduits are arranged in the shell in series, the metal conduits located at the two ends communicate with the water inlet pipe and the water outlet pipe correspondingly, a metal electrode is arranged in each metal conduit along the axis, and each metal electrode is connected with a plasma generation power source; the screen is arranged at the end part of each metal conduit and is used for filtering sewage entering or flowing out of the metal conduit; and the aeration device is connected with the plurality of metal conduits and is used for providing air into the metal conduits. According to the device, plasma is generated through air discharge, ozone, ultraviolet rays and oxidation active factors generated along with low-temperature plasma are fully utilized, organic sewage is effectively degraded in the device, and the overall efficiency of sewage treatment is improved.

The invention discloses a method for determining the K value of polyvinylpyrrolidone, and relates to the technical field of high polymer material determination. Based on the principle of molecular exclusion chromatography, the K value of PVP is judged by detecting the retention time of a to-be-detected sample and a reference substance by utilizing a molecular sieving mechanism of a gel chromatographic column; the method comprises the steps of preparation of a sample and a reference substance solution, operation setting of a high performance liquid chromatograph and analysis of detection data. Compared with a traditional Ubbelohde capillary viscometer method, the method has the advantages of being small in sample dosage, high in detection precision, good in reproducibility and easy and convenient to operate, the testing efficiency can be remarkably improved, and experimental errors can be reduced.