48results about How to "Stable retention time" patented technology

The invention relates to a method for determining fingerprint spectrum of traditional Chinese medicine for treating coronary heart disease. The method comprises the following steps: preparing a test solution, preparing a reference solution, and carrying out gradient elution under the chromatographic conditions that an Agilent ZORBAX Extend C18 chromatographic column is used as a filling agent, a mobile phase A is methanol and a mobile phase B is 0.4% phosphoric acid water solution; determining under conditions that the flow velocity is at 1.0ml/min, the column temperature is at 35 DEG C and the detection wavelength is 230-240nm, thus obtaining the fingerprint spectrum of traditional Chinese medicine. The method has the characteristics of being simple and convenient, good in reproducibility, more in characteristic peaks, accurate and reliable, and the like, and the quality of the traditional Chinese medicine preparation can be controlled effectively by the established fingerprint spectrum.

The invention relates to a method for simultaneously detecting multiple sugars and sugar alcohols in food. An HPLC-differential refraction detection method is adopted as the method; the method is characterized by comprising the HPLC chromatographic conditions that an amide-bonded column is adopted as a chromatographic column, single mobile phases of acetone, water and triethylamine are adopted as mobile phases, isocratic elution is performed, the column temperature is 70 DEG C, the flowing velocity is 0.8 ml/min, and the sample injection amount is 10 milliliters. The detection method can be suitable for the food such as honey, wine and baijiu; detection can be performed only by simply processing a sample, the method is rapid, high in recovery rate, wide in linear range, good in correlation coefficient and low in detection limit, and the blank of simultaneous detection on the sugars and sugar alcohols in the food in China is filled up.

The invention discloses a method for determining glucose, fructose and saccharose in tobacco essence perfume through a high performance liquid chromatography/differential refraction detector. The method comprises the following steps: dissolving a sample through 0.01 mol/L of caustic soda solution to be constant volume; adopting a cation exchange chromatography column, which takes highly cross-linked lead type sulfonated styrene-divinylbenzene (SDVB) resin as a filler, as a separation column; using pure water as a moving phase to carry out isogradient elution; detecting through the differential refraction detector; using an external standard method for quantification; and computing contents of the glucose, the fructose and the saccharose. The method has favorable linearity with correlation coefficient being greater than 0.999, recovery of 97.1 percent-102.4 percent, within-day precision being less than 1.2 percent, day to day precision being less than 3.0 percent, detection limit being lower than 1.8mug, and good sensitivity, and is suitable for analyzing and determining the glucose, the fructose and the saccharose for various tobacco essence perfume samples.

The invention provides a bushy knotweed leaf fingerprint HPLC method. The method comprises preparation of a sample to be detected and HPLC detection of the sample. The method can simultaneously detect 12 index components such as gallic acid, chlorogenic acid, ferulic acid, polydatin, rutin, isoquercitrin, quercitrin, resveratrol, quercetin, rheum emodin, chrysophanol and physcion in bushy knotweed leaf raw drugs and their products. The bushy knotweed leaf fingerprint HPLC method has a chromatographic peak resolution, realizes retention time stabilization of different samples and solves the bushy knotweed leaf capsule quality control problems.

The invention relates to a method for simultaneously detecting multiple sugars and sugar alcohols in dairy products. The method is an HPLC-RID (high performance liquid chromatography-refractive index detection) method and is characterized in that the chromatographic condition of HPLC is as follows: an amido bond column is adopted as a chromatographic column, a single mobile phase of acetone, water and trithylamine is adopted, and isocratic elution is performed; the column temperature is 70 DEG C; the flow velocity is 0.8 ml/min; the sample size is 10 mu L. The detection method is applicable to the dairy products such as milk, cakes, candy, milk powder and the like. Detection can be performed after samples are treated simply. The method is quick, high in recovery rate, wide in linear range, good in correlation coefficient and low in detection limit and fills up the blank of simultaneous detection of the sugars and the sugar alcohols in the dairy products.

The invention discloses a method for extracting and measuring sulfonamide antibiotics in plant. The method comprises the following specific steps: adding a pretreated plant sample into a methanol/hydrochloric acid mixed extracting solution, sequentially performing ultrasonic, vibration and centrifugation processes, then collecting supernate to be stand-by; continuously adding acetone into a residual, sequentially performing ultrasonic, vibration and vortexprocesses, and collecting supernate; separating the supernate through a solid phase extraction column, ensuring that eluant is methanol, drying the eluant through nitrogen, and dissolving the nitrogen through the methanol; measuring the content of sulfonamide antibiotics in a methanol solving liquid through high performance liquid chromatography. The method overcomes the problems of low recovery rate, complicated test processes and low detection limit in the research of sulfonamide antibiotic residues in the existing plant, and is convenient, accurate and efficient.

A rapid determination method for an active component in the mulberry tea or mulberry leaf relates to a determination method for an active component in the mulberry tea or mulberry leaf. The invention solves the problems that the process is complicated and the ingredients of the mulberry tea or mulberry leaf cannot be truly reflected in the method for preparing the essential oil from the active component in the mulberry tea or mulberry leaf, and the apparatus is expensive and the extraction content is small in the solid phase micro extraction method, which result in the test failure, in the existing pre-treatment method of the mulberry tea or mulberry leaf when testing and detecting the mulberry tea or mulberry leaf by a GC/MS (gas chromatography-mass spectrometer). The method comprises the following steps: 1, placing the mulberry tea or mulberry leaf in a dryer hermetically, aspirating and absorbing by a Tenax-TA absorption tube; 2, connecting a thermal desorption instrument with the GC-MS, placing the absorption tube in the thermal desorption instrument, setting parameters, and performing the determination; 3, calculating the relative content of the active component by a peak-area normalization method. The method is simple and free from property change of the active component, has low-cost apparatus and high detecting success rate up to 100%, and is capable of testing and detecting the mulberry tea or mulberry leaf.

The invention relates to the field of modernization of traditional Chinese medicine, and concretely relates to a preparation method and a detection method of a Himalayan teasel root standard decoction. The invention provides the preparation method of the Himalayan teasel root standard decoction. The preparation method includes the following steps: a Himalayan teasel root medicinal material is taken, decocted with water, and then filtered to obtain a filtrate; and the filtrate is concentrated, dried, and then freeze-dried, wherein the freeze-drying includes the following stages: a. pre-freezingwith pre-freezing temperature being -50 DEG C--45 DEGC; b. primary drying with drying temperature being -20 DEG C-0 DEG C; and c. secondary drying with drying temperature being 5 DEG C-25 DEG C, andthe Himalayan teasel root standard decoction is obtained. The extraction rate of the Himalayan teasel root standard decoction is 32.30-59.98%. Through an accelerated stability test of six months, theHimalayan teasel root standard decoction has stable content and stable moisture content, is moisture absorption-resistant, and does not produce impurity components. The invention provides the detection method of quality, content, transfer rate and characteristic spectrum of Himalayan Teasel Root saponins VI, which has good specificity, repeatability and stability, provides a standard for the quality of traditional Chinese medicine formula granules and achieves the quality control and effective supervision of the traditional Chinese medicine formula granules.

The invention relates to the field of quality inspection of capillary artemisia formula granules, and provides a fingerprint spectrum detection method of the capillary artemisia formula granules. The method includes the steps that chlorogenic acid is obtained for preparing a reference solution, capillary artemisia medicinal materials are obtained for preparing a multiple-node-sample solution, and high performance liquid chromatograph is conducted on the reference solution and the multiple-node-sample solution respectively, and the chromatographic conditions are as follows: an aqueous solution of methanol and acetic acid is used as a mobile phase, the reference solution and the multiple-node-sample solution are allowed to pass a chromatographic column respectively and subjected to gradient elution, the methanol volume is controlled in the gradient elution process, and the percentage, in the total amount of the le phase, of methanol volume is increased from 4-6% to 40-50% and then is reduced to 4-6%. The fingerprint spectrums of a product in all stages of the capillary artemisia formula granules can be established, and the quality of the capillary artemisia formula granules can be well controlled. Moreover, the invention provides a quality control method, including the capillary artemisia formula granule fingerprint spectrum detection method, of the capillary artemisia formula granules.

The invention discloses an analysis method for determining releasing rate of a quetiapine fumarate sustained release tablet. The method is about determining releasing rate of the quetiapine fumarate sustained release tablet, dissolution medium in the releasing rate method is composed of water, buffer salt and surfactant, and a liquid chromatography is used for analyzing a sample for test. The dissolution medium in the determining method can improve releasing quantity of the quetiapine fumarate sustained release tablet in a releasing rate experiment, build a proper chromatographic condition andachieve an aim of analysis.

The invention belongs to the technical field of chemical analysis and relates to ananalysis method for the content of 5-chloro-2-methoxycarbonyl-1-indanone ester. According to the analysis method, high performance liquid chromatography is adopted to detect the content of the 5-chloro-2-methoxycarbonyl-1-indanone ester; an SBC8 reversed phase chromatographic column is adopted as a chromatographic column; the temperature of the chromatographic column is 30 DEG C to 50 DEG C; a mobile phase is a mixed system of acetonitrile and ammonium carboxylate; the detection wavelength is 230 nm and 270 nm;impurities, a main peak and a solvent peak can be completely separated; the chromatographic peak shape is good; the retention time is stable; the integral calculation result is accurate; the repeatability is good; the reliability of the obtained result is high; and the method is particularly suitable for quality control of pesticide raw drug intermediate products.

The invention belongs to the technical field of compound detection, and provides an LC-MS/MS (liquid chromatography-mass spectrometry/mass spectrometry) detection method for gallotannin in plants, which comprises the following steps: mixing a plant gallotannin sample and a methanol solution, and sequentially extracting and centrifuging to obtain a sample to be detected; carrying out liquid chromatography separation and tandem mass spectrometry detection on a to-be-detected sample, and establishing a mass spectrometry database of gall tannin compounds; mRM quantitative ion pairs are obtained through screening according to MS/MS information, and optimized MRM mass spectrum conditions are obtained through a plant gallnut tannin sample; ion pairs and retention time of gallotannin compounds are integrated, and MRM mass spectrum conditions are optimized, so that qualitative and quantitative detection of gallotannin in plants is realized. According to the detection method disclosed by the invention, the detection process of the gallotannin compound does not depend on a chemical standard substance, the detection method has the advantages of comprehensive detection, high sensitivity, good repeatability, high accuracy, simplicity in operation and the like, and qualitative and quantitative analysis is realized at the same time.

The invention belongs to the technical field of pharmacochemistry, and particularly relates to a gas chromatography detection method and a preparation method of iodometyl pivalate. The detection method comprises the following steps of (1) storing a sample to be tested under the light avoiding and drying conditions; (2) setting the work conditions of a gas chromatograph, wherein a chromatographic column selects a KB-5 capillary chromatographic column; the column box temperature is 110 to 220 DEG C; the sampling opening temperature is 220 DEG C; the temperature of a detector is 240 DEG C; the flow rate of carrier gas is 0.3 to 0.7 ml/min; the split ratio is 80 to 1; the sampling quantity is 0.1mu L. By the preparation method of samples for detection, a treated iodometyl pivalate solution passes through a falling-film evaporator to obtain high-quality iodometyl pivalate. The analysis speed of the detection method is high; the detection sensitivity is high; the analysis result is accurate; no three wastes (waste water, waste gas and waste residue) are generated in the preparation process; the product purity is high.

The invention discloses an HPLC detection method of the content of salicylic acid in sugarcane leaves. The method comprises the following steps: S1, adding the sugarcane leaves to be detected into liquid nitrogen, grinding the leaves, carrying out methanol extraction, centrifuging the obtained extract, taking obtained supernatant, carrying out methanol extraction on obtained residues, centrifuging the residue extract, taking obtained supernatant, mixing the supernatants, carrying out reduced pressure evaporation, carrying out extraction decolorizing, carrying out reduced pressure evaporation on obtained lower layer water phase, adding a mobile phase to dissolve the evaporated water phase, allowing the volume of the obtained solution to reach a constant value, and filtering the solution to obtain a sample solution for later use; and 2, detecting the content of salicylic acid in the sample solution through adopting HPLC. The method allows the content of salicylic acid in sugarcane leaves to be accurately detected, and provides a scientific and powerful detection technology for the top rot resistance difference research of sugarcane varieties and the stress response biochemical mechanism of salicylic acid mediated sugarcane top rot pathogens.

The invention provides a detection method and application of related substances in hydroxypropyl beta-cyclodextrin, the related substances comprise 1, 2-propylene glycol and beta-cyclodextrin, liquid chromatography is adopted for detection, and the conditions are as follows: a phenyl bonded silica gel chromatographic column; a mobile phase A is water; the mobile phase B is methanol or acetonitrile; an elution procedure: eluting for at least 15 minutes by using the mobile phase A; switching the mobile phase, so that the volume fraction of the mobile phase A in the mobile phase A and the mobile phase B is reduced from 100% to 0-60%; maintaining elution of the switched mobile phase for a period of time; switching the mobile phase, so that the volume fraction of the mobile phase A in the mobile phase A and the mobile phase B is increased from 0-60% to 100%; and maintaining the mobile phase A to elute for a period of time. The method is good in specificity, applicability, accuracy, precision and durability and good in repeatability, and solves the problem that the related substances in the hydroxypropyl-beta-cyclodextrin are difficult to accurately detect under a continuous sample injection condition in the existing method.