Abstract: The present invention provides a snake venom thrombin marker peptide of Agkistrodon Halys Pallas and an application of the snake venom thrombin-like enzyme in identifying species of Hemocoagulase for Injection. The application includes the following steps of: dissolving a to-be-detected sample and a reference substance of the marker peptide respectively to prepare a test solution and a reference solution, and conducting alkylation reduction on the test solution and the reference solution with dithiothreitol and iodoacetamide; after diluting products with an ammonium bicarbonate solution, adding enzyme for hydrolysis; and after enzymolysis is finished, conducting centrifugation at a high speed, and injecting a supernatan into a liquid chromatography-mass spectrometer for analysis. This method is simple, convenient and rapid, is strong in specificity, fills the gap in identifying the source of species of the snake venom thrombin-like enzyme of Agkistrodon Halys Pallas and improves the quality control level.

Abstract: The present application is related to a method for identifying whether porcine heparin is adulterated with heparin from ruminants, comprising: (1) respectively detecting the contents of trisaccharide(4S) and ?UA2S-GlcNAc6S (?IA) in a sample and at least three batches of porcine heparin standards; (2) calculating a ratio of the trisaccharide(4S) to the ?IA as well as a standard deviation (SD) of the ratio in the porcine heparin standards; when the ratio of the trisaccharide(4S) to the ?IA in the sample exceeds a maximum value of the ratio in the porcine heparin standards+3SD, where the sample is considered to be mixed or adulterated with heparin from ruminants; wherein the detection method used is hydrophilic interaction liquid chromatography-mass spectrometry (HILIC-MS) or multiple reaction monitoring (MRM). The method can distinguish porcine heparin from ovine and bovine heparin based on the structural differences, regardless of the production process the heparin has undergone.

Abstract: The present invention relates to the technical field of chemical analysis and quantitative detection, in particular to a quantitative detection method for snake venom thrombin-like enzyme (SVTLE) from Agkistrodon halys pallas. The quantitative detection method for the SVTLE includes the following steps of taking a reference substance of marker peptide for the SVTLE from Agkistrodon halys pallas with an amino acid sequence of LDSPVSNSAHIAPLSLPSSAPSVGSVCR, and preparing a series of reference solutions with different concentrations; adding the reference solutions in test solutions respectively for enzymolysis, and then taking a supernatant after enzymolysis as a series of solutions to be detected; and adding the solutions to be detected in a liquid chromatogram-mass spectrometer, and then selecting a qualitative ion pair and a quantitative ion pair to detect contents of marker peptide in the solutions to be detected.

Abstract: A sequencing method, system and kit of low molecular weight heparin (LMWH) oligosaccharides are provided.

Abstract: The present invention relates to the field of chemical analysis detection and application, in particular to a marker peptide of snake venom thrombin-like enzymes (SVTLEs) from Agkistrodon Halys Pallas and an application thereof. The amino acid sequence of the marker peptide of snake venom thrombin-like enzymes (SVTLEs) from Agkistrodon Halys Pallas is TLCAGVMEGGIDTCNR. Characterizing the source of species and a content of the SVTLEs in a to-be-detected sample by using the marker peptide includes the following steps of: pretreating the to-be-detected sample by trypsin through enzymolysis, and taking a supernatant of an enzymolysis liquid as a test solution; and injecting the test solution and a reference solution into a liquid chromatography-mass spectrometer, and selecting a qualitative ion pair and a quantitative ion pair for detecting the source of species and a content of the SVTLEs in the to-be-detected sample.

Abstract: The present invention relates to the field of chemical analysis detection and application, in particular to a marker peptide of snake venom thrombin-like enzymes (SVTLEs) from Agkistrodon Halys Pallas and an application thereof. The amino acid sequence of the marker peptide of snake venom thrombin-like enzymes (SVTLEs) from Agkistrodon Halys Pallas is TLCAGVMEGGIDTCNR. Characterizing the source of species and a content of the SVTLEs in a to-be-detected sample by using the marker peptide includes the following steps of: pretreating the to-be-detected sample by trypsin through enzymolysis, and taking a supernatant of an enzymolysis liquid as a test solution; and injecting the test solution and a reference solution into a liquid chromatography-mass spectrometer, and selecting a qualitative ion pair and a quantitative ion pair for detecting the source of species and a content of the SVTLEs in the to-be-detected sample.

Abstract: The present invention relates to the technical field of chemical analysis and quantitative detection, in particular to a quantitative detection method for snake venom thrombin-like enzyme (SVTLE) from Agkistrodon halys pallas. The quantitative detection method for the SVTLE includes the following steps of taking a reference substance of marker peptide for the SVTLE from Agkistrodon halys pallas with an amino acid sequence of LDSPVSNSAHIAPLSLPSSAPSVGSVCR, and preparing a series of reference solutions with different concentrations; adding the reference solutions in test solutions respectively for enzymolysis, and then taking a supernatant after enzymolysis as a series of solutions to be detected; and adding the solutions to be detected in a liquid chromatogram-mass spectrometer, and then selecting a qualitative ion pair and a quantitative ion pair to detect contents of marker peptide in the solutions to be detected.

Abstract: The present invention provides a snake venom thrombin marker peptide of Agkistrodon Halys Pallas and an application of the snake venom thrombin-like enzyme in identifying species of Hemocoagulase for Injection. The application includes the following steps of: dissolving a to-be-detected sample and a reference substance of the marker peptide respectively to prepare a test solution and a reference solution, and conducting alkylation reduction on the test solution and the reference solution with dithiothreitol and iodoacetamide; after diluting products with an ammonium bicarbonate solution, adding enzyme for hydrolysis; and after enzymolysis is finished, conducting centrifugation at a high speed, and injecting a supernatan into a liquid chromatography-mass spectrometer for analysis. This method is simple, convenient and rapid, is strong in specificity, fills the gap in identifying the source of species of the snake venom thrombin-like enzyme of Agkistrodon Halys Pallas and improves the quality control level.

Abstract: A detection method for low molecular weight heparin complete degradation products using hydrophilic interaction chromatography and multiple reaction monitoring tandem mass spectrometry. Identifying the original reducing end and non-reducing end of enoxaparin sodium by means of reducing the reducing end of enoxaparin sodium, and performing hydrolysis using hydrogen peroxide. Performing quantitative analysis on all component units utilizing hydrophilic interaction chromatography and multiple reaction monitoring tandem mass spectrometry, in particular quantifying low-content special structures and characterizing low molecular weight heparin.

Abstract: A detection method for low molecular weight heparin complete degradation products using hydrophilic interaction chromatography and multiple reaction monitoring tandem mass spectrometry. Identifying the original reducing end and non-reducing end of enoxaparin sodium by means of reducing the reducing end of enoxaparin sodium, and performing hydrolysis using hydrogen peroxide. Performing quantitative analysis on all component units utilizing hydrophilic interaction chromatography and multiple reaction monitoring tandem mass spectrometry, in particular quantifying low-content special structures and characterizing low molecular weight heparin.

Abstract: The present disclosure relates to glycosylated and deglycosylated human PlGF-1, methods of using the glycosylated and deglycosylated human PlGF-1, antibodies that bind to human PlGF-1, methods of using the antibodies and human PlGF-1 immunoassays and kits.

Abstract: The present disclosure relates to glycosylated and deglycosylated human PlGF-1, methods of using the glycosylated and deglycosylated human PlGF-1, antibodies that bind to human PlGF-1, methods of using the antibodies and human PlGF-1 immunoassays and kits.