54results about How to "Moderate retention time" patented technology

The invention discloses a blood-production preparation quality test method which comprises the following steps: (1) preparation of a comparison product solution; (2) preparation of a test sample solution; (3) chromatographic conditions: a chromatographic column is C18 reversion phase chromatographic column; gradient elution is adopted, and a flowing phase is a gradient elution solution composed of acetonitrile and 0.1-0.2 percent of a phosphoric acid solution; the detection wavelength is 200-230 nanometers; the column temperature is 25-40 DEG C; the flowing speed is 0.8ml/min-1.2ml/min; the analysis lasts for 60 min; and (4) testing: the fingerprint spectrum is obtained through efficient liquid phase chromatography. The testing method provided by the invention is simple to operate, characteristic components are completely retained, and the testing method is good in repeatability and stability, high in precision and strong in specificity.

The invention discloses a method for preparing HM-3 polypeptide, which belongs to the field of polypeptide technology in the field of biochemistry, and uses Fmoc-Asp(Otbu)-wang resin or Fmoc-Asp(Otbu)-CTC resin as a starting material , and then use protected amino acids to inoculate dipeptide to octadecapeptide sequentially, fully wash after the peptide incorporation work is completed, then cut the peptide, and post-process to obtain the crude product of HM-3. The crude product was dissolved, purified twice by preparative high performance liquid phase, and finally concentrated and freeze-dried to obtain the pure product. The method not only ensures the synthesis efficiency, but also improves the purity.

The invention discloses a callicarpa nudiflora medicine, an intermediate and a fingerprint detection method of a preparation. The method comprises the following steps: (a) preparation of a reference solution; (b) preparation of a test solution; (c) chromatographic condition; (d) formulation of a standard fingerprint of isoacteoside as a reference peak; and (e) quality control of the fingerprint. According to the above method, a pretreatment method of each tested object is simple, characteristic constituents are retained completely, stability is good, precision is high, and there is certain specificity. The separation effect of each characteristic peak in the fingerprint is good. The callicarpa nudiflora medicine, the intermediate and the fingerprint of the preparation have good correlation. The method can be used for identifying quality of the callicarpa nudiflora medicine and increasing production process controllability of the callicarpa nudiflora preparation, and is helpful for guaranteeing quality stability and clinical efficacy of the callicarpa nudiflora preparation. The invention also discloses the callicarpa nudiflora medicine obtained according to the above fingerprint detection method, the intermediate and the standard fingerprint of the preparation.

The invention discloses a research for realizing quick classification and identification of chemical components in an ixeris sonchifolia hance injection based on a UPLC-Q-TOF-MS technology, and aims to take flavonoids, organic acids, amino acids and nucleosides in the ixeris sonchifolia hance injection as research objects to realize quick classification and identification of the chemical components in the ixeris sonchifolia hance injection based on a UPLC-Q-TOF-MS technical platform. The research comprises the following steps: firstly, performing information integration on components of flavonoids, organic acids, amino acids and nucleosides in the ixeris sonchifolia hance injection to discover and summarize a rule for diagnosing fragments and neutral losses of the four types of substances; meanwhile, performing mass spectrographic analysis on reference substances of different types of compounds by adopting the UPLC-Q-TOF-MS technology, and performing verification; and constructing a method for realizing quick classification and identification of chemical components in the ixeris sonchifolia hance injection by using a method for diagnosing fragments and neutral losses as a screening and identifying tool.

The invention relates to the field of veterinary drug residue detection, in particular to an analysis method for efficiently detecting piperazine residues in chicken tissue, eggs and pork. The methodcomprises the steps of extracting and purifying the chicken tissue, eggs or pork samples through an accelerated solvent extraction method and a solid phase extraction method, performing derivatizationwith dansyl chloride and then performing detection by using an ultra-high performance liquid chromatography fluorescence detection method. Compared with other detection methods, the method has the advantages of higher analysis efficiency, less mobile phase consumption, a high recovery rate, high accuracy, high sensitivity and good reproducibility.

The invention relates to the technical field of analytical chemistry and particularly relates to a method for simultaneously assaying glucosamine and chondroitin sulfate in healthy foods. According tothe method, by adopting an evaporative light scattering detector, the sensitivity of detection on the glucosamine and the chondroitin sulfate is improved; by adopting an amide chromatographic column,the retention time is moderate, the degree of separation is good, the separation of all chromatographic peaks is relatively good, the reference line is stable, the peak form is good, and the repeatability is relatively good. The method has good linear relationship, precision, stability and recovery rate, can be used for accurately assaying the content of the glucosamine and the chondroitin sulfate in the healthy foods simultaneously, is applicable to the assaying of the glucosamine and the chondroitin sulfate in the healthy foods and is also applicable to the assaying of glucosamine or chondroitin sulfate raw materials.

The invention discloses a method for measuring content of dimethylbenzene oxidation products by using an HPLC external standard method. According to the method, a high performance reversed-phase liquid chromatograph instrument is adopted, a C18 silica gel chromatographic column is taken as a separation column, an ultraviolet visible absorption detector is adopted, methanol and an acid aqueous solution are taken as mobile phases, phthalate, isophthalic acid and terephthalic acid are taken as standard samples, a concentration-peak area standard curve of a target component is drawn by using the external standard method so as to obtain a linear regression equation, and contents of the phthalate, isophthalic acid and terephthalic acid are calculated by using the regression equation. Through adoption of the method, three main products with similar polarity and four byproducts including 3-formylbenzoic acid, benzoic acid, paratoluic acid and p-tolualdehyde can be separated effectively, and the method takes short time in analysis, is easy and feasible, and is convenient and reliable.

The invention provides a method for determining other amino acids in an L-valine raw material by high performance liquid chromatography. The method comprises the following steps of preparing L-valine,leucine, isoleucine, glycine, alanine and phenylalanine reference substance solutions; detecting through a high performance liquid chromatograph, comparing the appearance time and peak shape of L-valine, leucine, isoleucine, glycine, alanine and phenylalanine in a chromatogram of the test sample with those of L-valine, leucine, isoleucine, glycine, alanine and phenylalanine in a chromatogram of the reference substance solution, and judging whether the test sample solution contains other amino acids or not. According to the method, by screening an aminopropyl bonded silica gel chromatographiccolumn, the separation effects are found, and by screening the wavelengths, the maximum absorption of each amino acid is found, and the retention time of each amino acid peak on the chromatographic column is regulated and controlled by regulating the ratio of triethylamine, the pH value and the ratio of two phases by utilizing an acetonitrile/phosphate buffer solution binary mobile phase, so thatthe hydrolysis and shedding of bonded aminopropyl in the amino column are effectively prevented, and the problems of short reverse-phase service life and unstable baseline of the amino column are solved.

A method of measuring the EGCG content in tea polyphenols is disclosed. The method includes (1) a step of setting high performance liquid chromatography conditions, (2) a step of preparing a contrast solution, (3) a step of preparing a solution of a sample to be detected, and (4) a step of measuring the content, namely a step of separately measuring the contrast solution and the solution of the sample to be detected, injecting into a liquid chromatograph, performing operation of the high-efficient liquid chromatograph, recording chromatograms and calculating the EGCG content by utilizing the chromatograms. The method adopts a gradient elution manner, and can effectively separate EGCG and EC which are two components difficult to separate in the tea polyphenols. The method is simple, convenient, high in sensitivity, good in reappearance, good in sample separation degree, good in symmetry, good in peak shapes, proper in retention time and more suitable for routine detection, and can be effectively used for EGCG content detection and quality control.

The invention provides a method for determining the content of clindamycin phosphate vaginal tablets. The method adopts high performance liquid chromatography for detection, selects mobile phase components, adopts scientific proportioning, adopts gradient elution and sets elution conditions, and can rapidly and accurately detect the content of clindamycin hydrochloride for injection so as to achieve the purpose of simply, conveniently, rapidly and accurately controlling the product quality.

The invention provides a content determination method for anabasine, which is used for determining content of the anabasine in alangium chinense which is a traditional Chinese medicinal material. The content determination method includes firstly extracting the traditional Chinese medicinal material alangium chinense by means of ultraphonic, obtaining a sample solution, and determining the content of the alangium chinense by means of high performance liquid chromatography. The content determination method has the advantages of being easy, simple and fast to operate, high in specialization, precision degree and recovery rate, exact in determination results, and the like, the purpose of completing the quality standard of the alangium chinense is achieved, and experimental basis is provided for safe, effective and rational use of the alangium chinense.

The invention provides a method for detecting an impurity F and an impurity G of omeprazole sodium. The omeprazole sodium impurity F and the omeprazole sodium impurity G are detected by adopting high performance liquid chromatography, optimization is carried out on the basis of raw material medicines, and the proportion of an organic phase is increased so that the omeprazole sodium impurity F and the omeprazole sodium impurity G can be effectively eluted, and the omeprazole sodium impurity F and the omeprazole sodium impurity G can be effectively detected. Main peak retention time, an area and a height are moderate, a theoretical plate number and a separation degree are good, a tailing factor is in the range of 0.9-1.95, the S/N is 10-30, the requirements are met, and a reference basis is provided for the quality control of omeprazole sodium.

The invention relates to the technical field of analysis chemistry, and in particular relates to a detection method of residual solvents in a (N-(3-chloro-4-(3-fluorobenzyloxy)phenyl-6-(3-(4-methyl-4-oxo-1-nitrogen-4-phosphorus hetero yclohexane-1-yl)propyl-1-alkynyl)quinazoline-4-amine, bis 4-methyl benzenesulfonate bulk drug. According to the method, the (N-(3-chloro-4-(3-fluorobenzyloxy)phenyl-6-(3-(4-methyl-4-oxo-1-nitrogen-4-phosphorus hetero yclohexane-1-yl)propyl-1-alkynyl)quinazoline-4-amine, bis 4-methyl benzenesulfonate bulk drug is dissolved by DMSO, and then is injected in headspace, and the contents of four residual solvents, namely methyl alcohol, ethanol, isopropyl alcohol and N,N-dimethylformamide are detected by gas chromatography; and the column temperature of the gas chromatography is maintained for 5min at 35-50 DEG C, and then raised to 220+/-10 DEG C at the speed of 20 DEG C/min and maintained for 5-9min. According to the detection method, by verification, methyl alcohol has a detection limit of 0.3ppm and a quantification limit of 1.6ppm, ethanol has a detection limit of 0.5ppm and a quantification limit of 2.5ppm, isopropyl alcohol has a detection limit of 0.5ppm and a quantification limit of 2.6ppm, and DMG has a detection limit of 8.5ppm and a quantification limit of 19.1ppm. After the same sample is repeatedly detected for six times, the RSD is less than or equal to 2%, and the added sample recovery rate is 97.4%-103.1%, which indicates that the accuracy and precision are good.

The invention discloses a method for determining the content of nitidine chloride in radix zanthoxyli toothpaste, and belongs to the field of chemical detection. The method is accurate, simple and convenient and can be used for controlling the content of nitidine chloride in the radix zanthoxyli toothpaste. The method comprises the following sub-steps sequentially: firstly, extracting nitidine chloride from radix zanthoxyli with ethanol, and collecting ethanol extract; secondly, determining the content of nitidine chloride in the ethanol extract with HPLC (high performance liquid chromatography). The method can be used for determining the content of nitidine chloride in the radix zanthoxyli toothpaste.

The invention discloses a detection method for capecitabine related substances: the method adopts high performance liquid chromatography for detection, and includes the following steps: Step 1. Prepare a capecitabine sample solution, the capecitabine The sample solution includes capecitabine test solution and capecitabine control solution; step 2, inject the sample solution obtained in step 1 into a high performance liquid chromatograph, and use mobile phase A and mobile phase B as mobile phases for gradient elution , and record the chromatogram. The detection method adopts a pentafluorophenyl bonded silica gel chromatographic column. The detection method is easy to operate, the retention time of the main peak of capecitabine is suitable, the defects of the prior art are overcome, the impurity D and the impurity E are effectively separated, other known impurities can be effectively detected, and the separation degree is high. It has strong specificity and accurate and reliable detection results, which provides a simple and reasonable detection method for the quality control and impurity research of capecitabine.

The invention relates to the field of veterinary drug residue detection, in particular to a quantitative detection method for tilmicosin residues in poultry meat, pork or poultry eggs. The method comprises the following steps of sequentially extracting the poultry meat, the pork or the poultry eggs by acetonitrile, degreasing by normal hexane, purifying an extracting solution by an HLB solid-phase extraction column, and blow-drying and concentrating an eluent by nitrogen; adding the pyridine and acetic anhydride into the concentrated and dried sample, filtering after derivative reaction, and detecting filtrate by GC-MS/MS detection. According to the present invention, the derivative product obtained by adopting the extraction method combining the liquid-liquid extraction, solid-phase extraction and gel chromatography is good in peak pattern and few in interference impurity peak, and the response value of the sample derivative product is high.

The invention discloses an establishment method of an oyster powder fingerprint spectrum and the fingerprint spectrum. The establishment method of the fingerprint spectrum comprises the following steps of: 1, preparing a reference peak solution; 2, preparing an oyster powder test solution; 3, precisely sucking a certain amount of the reference peak solution and the test solution respectively, injecting the solutions into a liquid chromatograph, and recording a chromatogram; and 4, exporting the oyster powder fingerprint spectrum obtained in the step 3 from the instrument, importing the oysterpowder fingerprint spectrum into a traditional Chinese medicine chromatographic fingerprint similarity evaluation system, selecting chromatographic peaks existing in chromatograms of different batchesof oyster powder test samples as common peaks, generating a control fingerprint spectrum of the oyster powder by using an average value calculation method, and calculating the relative retention timeand the relative peak area of each common peak. The method for establishing a fingerprint spectrum has the advantages of simplicity, convenience, stability, high precision, good reproducibility and the like. The oyster powder fingerprint spectrum provided by the invention can comprehensively and objectively characterize the quality of oyster powder, and is beneficial to comprehensive monitoring of the quality of medicines.