121 results about "Ion strength" patented technology

The invention relates to a cervical exfoliated cell preservative liquid, the preservative liquid comprises the following components with the contents (by weight): 20 percent to 50 percent of alcohols; 15 percent to 50 percent of anti-aggregation reagent; 5 percent to 10 percent of buffer solution; 1 percent to 20 percent of ion strength maintaining reagent; 0.01 percent to 0.5 percent of anti-microbial reagent; 0.1 to 5 percent of mucus dissolving reagent; and 0 to 0.5 percent of cleaning agent. Compared with the prior art, the preservative liquid can not only lead cells to maintain the shape in an in vitro liquid suspension environment, minimize the protein precipitation, dissolve larger protein substances, such as blood and mucus, and reduce the cell aggregation, but can also selectively eliminate or reduce red cells, effectively kill microbes, prevent the activity of reverse transcriptase and retain the integrity of nucleic acids and proteins for facilitating the later analysis; in addition, the preservative liquid can greatly reduce the costs of consumptive materials for the TCT detection, improve the sensitivity and the specificity of the cervical cancer screening and accelerate the promotion and the popularization of the TCT technology in a medical system.

The invention discloses a tea leaf classifying method. The tea leaf classifying method comprises the following step of using a vapor phase-ion transfer joint technique to detect volatile organic compounds in different types of tea leaves, wherein detection information is used as classifying basis. The tea leaf classifying method is characterized in that feature information of different types of tea leaves are respectively represented by corresponding ion transfer time and ion strength under different retention time, the method comprises collection of a three-dimension spectrum map, selection of a spectrum map feature area, pre-processing of data and analysis of chemical metering data, so as to classify samples. The tea leaf classifying method has the advantages that the vapor phase-ion transfer joint technique can be widely applied to the field of quick analysis of qualities of foods and agricultural products containing complicated systems; the analysis time is short, the resolution is high, the sensitivity is high, the non-destructive detection can be performed, and the tea leaf classifying method can be applied to classify the types of tea leaves.

The invention discloses a preparation method of a self-repairing hydrogel type dressing material based on a layer-by-layer assembly function. The hydrogel dressing material is controllably constructed by selecting the optimal assembly elements, utilizing the advantages of a layer-by-layer assembly technology on constructing a gel membrane material, and adjusting the optimal assembly conditions (acid-base value, ion strength, solvent, etc.). Furthermore, based on the layer-by-layer assembly technology, target substances with different properties and performances can be assembled to the dressing material through many modes, and the target substances can be controllably released. The prepared dressing material has the following characteristics: (1) the dressing material has a strong dressing performance and excellent biocompatibility and thus is an ideal wet dressing material; (2) the dressing material has an excellent controlled release function and is capable of precisely releasing loaded drugs under specific incentive conditions; and (3) the dressing material has an excellent self-repairing performance and can repair damaged parts rapidly, the service life is prolonged, and the secondary damage caused by replacement is avoided.

A mass spectrometer includes a flight control device for allowing ions from an ion source to repeatedly fly along an orbit in a flight space for predetermined times; a detecting device for detecting the ions after the ions repeatedly fly along the orbit for the predetermined times; and a data processing device for starting collection of ion strength data detected by the detecting device. The ion strength data is obtained during the flight of the ions along the orbit, or when the ions are headed toward the detecting device after departing from the orbit, or when one of the above situations is estimated.

The invention discloses a method for detecting various vitamins in serum/plasma at the same time. The method includes following steps: (1), well mixing to-be-detected serum/plasma with deproteinized liquid, centrifuging, and taking supernate; (2), well mixing the supernate obtained in the step (1) with internal standard mixed liquid, adopting tandem mass spectrometry for detection, and comparing ion strength of vitamins and internal standards of the vitamins to acquire content of the vitamins in the to-be-detected serum/plasma. In addition, the invention further discloses a kit for detecting various vitamins in serum/plasma at the same time. The kit comprises the internal standard mixed liquid, the deproteinized liquid, a mobile phase and probe washing liquid. By the method, various water-soluble and fat-soluble vitamins can be extracted from the serum/plasma, and a tandem mass spectrometer is utilized to quantify more than ten vitamins in one specimen within 2-3min, so that detection period is remarkably shortened, and vitamin detection results are higher in degree of precision and accuracy.

The invention discloses a method for measuring boric acid in a water-based adhesive for cigarettes, which comprises the following steps: accurately weighing a certain amount of water-based adhesive sample for cigarettes, putting the water-based adhesive sample for cigarettes in a microwave digestion tank, adding nitric acid (HNO3) and oxydol (H2O2) to perform pre-digestion, tightening to seal the digested water-based adhesive sample solution for cigarettes in the microwave digestion tank, and introducing the sample solution into an inductive coupling plasma emission spectrum mass spectrometer to carry out detection; and detecting characteristic ion strength of boron (B) element and on-line internal standard germanium (Ge) element in the sample solution, carrying out quantitative determination by an internal standard calibration curve method, calculating the content of B element in the water-based adhesive for cigarettes, and acquiring the content of HBO3 by using the reduction coefficient. The method disclosed by the invention has the advantages of high test accuracy, high sensitivity and favorable repetitiveness, and is simple to operate. The invention is suitable for technical personnel in tobacco industry and cigarette adhesive production enterprises to carry out quantitative determination on HBO3 in the water-based adhesive for cigarettes, and fills up the blank in the technical field.

The invention discloses a method for preparing photoelectric material CsPbBr3. The method includes the steps that an HBr water solution with Pb2+ and an HBr water solution with Cs+ are mixed at the certain temperature, and after a reaction is completed, reacting products are washed and subjected to vacuum drying, and CsPbBr3 polycrystal powder is finally obtained. According to the method, the ion strength of the solution is adjusted by controlling the molar ratio of Cs+/Pb2+, the problem that CsPbBr3 is instable in the water environment is solved, and therefore a single-phase CsPbBr3 material can be prepared in the water solution. The method is simple in preparing technology, low in used raw-material cost and suitable for mass production.

The invention discloses an ultrafiltration membrane separation method for obtaining royal jelly major protein and active filtrate in royal jelly. The method comprises the following steps: weighing royal jelly, stirring and mixing uniformly with water at the temperature of 4 DEG C, regulating pH by using NaOH, regulating the ion strength by using NaCl, and removing particles by using a 0.2mu m microfiltration membrane; separating and removing macromolecular impurities by using an ultrafiltration membrane M1 with the molecular weight cutoff of 100kDa, separating and concentrating the royal jelly major protein in the M1 filtrate by using an ultrafiltration membrane M2 with the molecular weight cutoff of 49kDa, supplementing purified water when the royal jelly major protein is concentrated to be 1/3 volume, allowing a small molecule solution to pass through the M2, wherein the obtained cutoff solution is a purified and concentrated royal jelly major protein solution, and performing freeze drying to form the royal jelly major protein freeze-dried powder. The small molecule solution contains polysaccharides and 10-hydroxy-2-caproleic acid (10-HDA) and can be used for production of functional drinks. The royal jelly major proteins (MRJPs) are separated and concentrated by using an ultrafiltration device, the extraction rate of the MRJPs is 82.63 percent, and the royal jelly major protein is subjected to freeze-drying to form the freeze-dried powder with the protein content of more than 70 percent. Moreover, the filtrate is used for preparing drinks, and comprehensive utilization of the royal jelly is realized.

The invention discloses an intelligent hydroxybutyl chitosan hydrogel stent based on the 3D printing technology and a preparation method of the intelligent hydroxybutyl chitosan hydrogel stent based on the 3D printing technology. The intelligent hydrogel, thermo-sensitive hydroxybutyl chitosan, which is of a single system and has high responsiveness to temperature and ion strength is adopted, the feature that sol-gel phase change is caused by the temperature and the ion strength of the thermo-sensitive hydroxybutyl chitosan is utilized, and the formed hydrogel stent is obtained through adjustment and control over the temperature and 3D printing parameters; then, through inorganic-salt-induced phase change, the hydrogel stent is evenly shrunk, and the mechanical strength and the precision of the hydrogel stent are further improved. The intelligent hydroxybutyl chitosan hydrogel stent based on the 3D printing technology overcomes the defects that 3D printing hydrogel is generally poor in formability, low in mechanical strength, low in precision and the like. Compared with existing common methods of adopting photosensitizer, complex-system hydrogel and the like, the intelligent hydroxybutyl chitosan hydrogel stent based on the 3D printing technology does not need introducing of any photosensitizer or cross-linking agent, is simple in system and gentle in technology; and the prepared 3D stent has high mechanical strength and is provided with a precise internal structure, and the prepared 3D stent can be widely applied to tissue engineering and tissue repair of the cartilage, the skin, the vessel, the nerve, the myocardium and the like.

The invention relates to a method for measuring pH by using photonic crystal wettability. The method comprises the following steps: (1) preparing an ethanol dispersion solution of microspheres; (2) preparing a silica photonic crystal film; (3) preparing pH responsive photonic crystal films with different infiltrating abilities; (4) putting the photonic crystal film with a wettability response into the known solutions with different pH values, orderly measuring whether the pH responsive photonic crystal films with different infiltrating abilities can be infiltrated to generate an obvious color change under different pHs, and recording; and (5) soaking an array formed by the pH responsive photonic crystal films with different infiltrating abilities into a to-be-measured solution, and observing the color change, so as to know the pH value of the to-be-measured solution. Compared with the prior art, the method disclosed by the invention can be repeatedly used, and is not affected by ion strength, pH measurement value is accurate, the error is smaller than 0.05-0.2pH, and the measurement numerical value is stable.

The invention discloses linseed oil emulsion taking compounded linseed gum as an emulsifier and a preparation method of the linseed oil emulsion. The preparation method of the linseed oil emulsion comprises the following steps: 1) preparing a water solution of the emulsifier as a water phase, wherein the emulsifier is a mixture of Arabic gum and the linseed gum; 2) taking linseed oil as an oil phase and adding the oil phase into the water phase to obtain a primary emulsion; 3) homogenizing the primary emulsion to obtain the linseed oil emulsion. The linseed oil emulsion disclosed by the invention is small in grain diameter, good in dispersity and high in physical stability; meanwhile, the linseed oil emulsion has relatively high oxidization stability under different temperatures and pH (Potential of Hydrogen) conditions, and has a stronger environment change resisting capability when being compared with emulsion prepared by protein-polysaccharide layer-by-layer preparation; the linseed oil emulsion can keep relatively good stability under the conditions of relatively wide pH range and relatively great ion strength and in process treatment of sterilization, freeze thawing and the like. The linseed oil emulsion prepared by the invention has good storage stability; compared with a pure oil system of the linseed oil emulsion, the linseed oil emulsion has relatively good protection effect on linolenic acid.

The invention discloses a classifying method of vegetable oils. The classifying method adopts a gas phase-ion migration combination technology to detect volatile organic compounds in different types of vegetable oils, and the information is used as a classifying foundation. The classifying method adopts ion migration time and ion strength corresponding to different retention times to type characteristic information of each different vegetable oil, and comprises the following steps of collecting a three-dimensional spectral graph; selecting the characteristic area of the spectral graph; preprocessing data; and performing stoichiometric data analysis, so that a sample is classified. According to the classifying method disclosed by the invention, the gas phase-ion migration combination technology can be widely applied in the field of quick analyzing of quality of each food and each agriculture product containing a complex system, the analyzing time is short, the resolution rate is high, the sensitivity is high, and non-destructive detection is adopted, so that the classifying method can be applied for the classifying of the vegetable oils.

The invention belongs to the technical field of radioactive substance processing methods, and particularly relates to a method for analyzing fluorine ion concentration under a radioactive condition. The method is characterized in that a fluorine ion selective electrode method is adopted, by using sulfosalicylic acid-trisodium citrate as a total ion strength regulation buffer solution, the calculation is carried out by using a secondary standard addition method under a condition that pH is 8-9 so as to obtain F-concentration in an original sample. Aiming at the sample containing BF<4><->, the method provided by the invention has the advantages that complexing action on the ion F by the ion Al is skillfully utilized to ensure that BF<4><-> is completely hydrolyzed; in an analyzing process, distillation operation is avoided, and the loss of radioactive substances is reduced; moreover, a value of a slope S is not needed, and therefore, the errors caused by improper setting of the slope S can be avoided.

Internally calibrated pH and other analyte sensors based on redox agents provide more accurate results when the redox active reference agent is in a constant chemical environment, yet separated from the solution being analyzed in such a way as to maintain electrical contact with the sample. Room temperature ionic liquids (RTIL) can be used to achieve these results when used as a salt bridge between the reference material and the sample being analyzed. The RTIL provides the constant chemical environment and ionic strength for the redox active material (RAM) and provides an electrolytic layer that limits or eliminates direct chemical interaction with the sample. A broad range of RAMs can be employed in a variety of configurations in such “Analyte Insensitive Electrode” devices.

A method of mass spectrometry is disclosed comprising setting an attenuation factor of an attenuation device to a first value and then separating or filtering ions according to a first physico-chemical property and separating or filtering ions according to a second physico-chemical property and obtaining a multi-dimensional array of data. The most intense ion peak within one or more subsets of the multi-dimensional array of data is determined. If it is determined that the most intense ion peak would cause saturation of an ion detector or ion detection system then the method further comprises adjusting the attenuation factor of the attenuation device to a second value and obtaining mass spectral data wherein the adjustment of the attenuation factor substantially alters the intensity of all ions which are detected by the ion detector or ion detection system equally and irrespective of the mass to charge ratio of the ions. The intensity of the mass spectral data is then scaled based upon the degree to which the attenuation factor of the attenuation device was increased or reduced.