62 results about "Protein band" patented technology

A system and method using an electronic light detector array, e.g., a CCD or a CMOS-based detector array, is used to acquire a visual image of a biological sample that includes biological material associated with a biological material holding structure (e.g., a DNA spot array on a DNA chip, protein bands in a 2-D gel, etc.). For example, fluorescence from a biological sample may be detected.

The invention discloses a method of establishing liquid chromatography-mass spectrometry (LC-MS) analysis of a royal jelly sensitized protein. The method comprises the following steps: carrying out electrophoresis analysis on royal jelly proteins, preprocessing the sensitized protein bands, analyzing sensitized protein bands by LC-MS, screening the specific peptide fragments of sensitized proteins; extracting proteins from a royal jelly sample, digesting the proteins by enzymes, and quantitatively measuring the sensitized proteins by LC-MS/MS. The provided sensitized protein quantitative method has the advantages of high specificity and sensitivity, good repeatability, high accuracy, and wide linear range, and is capable of precisely and quantitatively analyzing a sensitized protein in a sample.

Molecular species that are immobilized in discrete locations on a planar support such as protein bands on a gel or a blotting membrane or species applied in dots or spots on a membrane are reacted with binding reagents that are applied through a porous hydrophilic transfer sheet placed over the planar support, the sheet having at least one region that is laterally bordered by a barrier with the binding reagent retained within the bordered region. The bordered region is placed directly over an area on the planar support where the molecular species are expected to reside if they are present on the support. The binding reagent is then delivered into the support to contact the species. Targeted delivery of the binding reagent is thus achieved with improved efficiency.

The invention provides a method for distinguishing Chinese honeybee honey from apis mellifera honey based on major royal jelly protein ingredients. By means of a biological method and the difference between Chinese honeybee honey and apis mellifera honey in protein, different protein bands appear by conducting protein electrophoresis on a honey sample after the honey sample processed, protein categories are determined by conducting mass spectrometry on the different protein bands, and then the two kinds of honey from different bee species are identified. The problems that Chinese honeybee honey and apis mellifera honey available in market are hard to distinguish, and apis mellifera honey pretends to be Chinese honeybee honey or is mixed in Chinese honeybee honey are solved, and the situation that low-price apis mellifera honey pretends to be high-price Chinese honeybee honey can be inhibited. The method is used for distinguishing Chinese honeybee honey from apis mellifera honey.

The invention relates to the field of cultural relic detection and discloses a method for detecting ancient argillic silk fabric on the basis of immunoblotting. The method comprises steps as follows: firstly, a silk secondary antibody marked with fluorescent carbon points is prepared, a modern silk sample and an ancient argillic silk fabric sample are hydrolyzed with an ionic liquid and PM13-alkaline protease step by step, a protein extraction solution is obtained and subjected to dialysis, purification and SDS-PAGE gel electrophoresis, an obtained protein band is transferred to a PVDF (polyvinylidene fluoride) film and subjected to incubation with a silk first antibody and the silk secondary antibody marked with the fluorescent carbon points, an immunofluorescence band can be observed in a gel imaging system, and the type of ancient silk is identified. The consumption of chemical reagents is low, the reaction is mild, and the method is environment-friendly and harmless; during detection for the ancient silk fabric, the method has the characteristics of being low in sample consumption, direct, rapid and high in sensitivity.

The invention discloses a device and a method for establishing single-cell level connection between neurons; the device comprises a basement whose upper surface is provided with protein band, and the region outside the protein band at the basement is covered by a polyether F127 layer; a PDMS stamp which is covered to the upper surface of the basement and whose lower surface is provided with a micro-groove unit; the micro-groove unit comprises: a linear type intermediate groove and at least one linear type side groove which is arranged at the left side or/and the right side of the intermediate groove, the middle section of the side groove does not intersect with the intermediate groove, and two end sections outside the middle section of the side groove incline to the direction away from the intermediate groove; the groove end is provided with a vertical hole channel; the protein band intersects with the groove without superposition; neurons are sent into the channel and only adhere to the protein band, the neurite directionally grows along the protein band without branching, thereby obtaining single-line connection of neuron single-cell level; the structure is simple, the operation is easy, and the orderly growth of the neurite can be controlled, and the electrical signal transduction between the neurocytes can be precisely studied, furthermore, the invention provides foundation support for manufacturing of bio-sensors.

The invention relates to a qualitative detection method capable of distinguishing cow milk doped in human milk. The qualitative detection method is a protein gel electrophoresis method. The electrophoresis method comprises the following steps of: putting a prepared gel plate into an electrophoresis slot, adding an electrode buffer solution, performing pre-electrophoresis under 30 to 120 volts for 15 to 60 minutes, injecting the treated test sample solution into a gel sample application hole, performing electrophoresis under 50 to 200 volts until a bromophenol blue indicator is electrophoresized to the bottom of the gel, and finally taking out the gel and fixing in a fixing solution, dyeing in a dyeing solution and decoloring in a decoloring solution so as to obtain a protein electrophoresis pattern; and comparing the sample electrophoresis pattern with a characteristic protein band in the electrophoresis pattern of pure human milk and pure cow milk prepared under the same condition so as to determine whether liquid cow milk or milk powder reconstituted milk is doped into the sample milk. In the method, only one gel electrophoresis apparatus and a conventional chemical reagent are needed, the operation is simple and the result is reliable; and the cow milk or a product of the cow milk doped into the human milk can be detected.

The invention discloses a method for separating and purifying scallop phenol oxidase. The method is characterized by comprising the following steps of: (1) obtaining haemolymph from adductor muscles of scallops, centrifuging, suspending and crushing the haemolymph, then centrifuging the crushed haemolymph, and taking the supernate, namely obtaining blood cell crushed supernate; (2) performing continuous gradient non-denaturing electrophoresis on the blood cell crushed supernate serving as a sample; (3) positioning a phenol oxidase protein band of non-denaturing electrophoresis by using a specific substrate coloring method; and (4) performing glue cutting on a destination band, reclaiming the phenol oxidase protein band by an electro-elution method, and obtaining purified scallop phenol oxidase protein after dialysis and freeze-drying. The method has the advantages that: (1) the method has short purification time; (2) the method has simple and convenient operation, simple equipment requirement and low cost, and greatly reduces the treatment steps of the sample; and (3) the purified sample has high purity, only presents one band by non-denaturing and denaturing electrophoresis detection, keeps the bioactivity of enzyme well and improves the purifying efficiency.

The invention relates to the field of genetic engineering, microbiology, enzyme engineering and fermentation engineering, and provides a method for expressing and purifying a low temperature chitinasegene chiA (chitinase A) in kluyveromyceslactis.The method for expressing and purifying the low temperature chitinase gene chiA (chitinase A) in the kluyveromyceslactissuccessfully constructs a recombinant kluyveromyceslactis producing the low temperature chitinasechiA and purifiesthe recombinant kluyveromyceslactisto obtain a high purity recombinant chitinasechiA, and a pure recombinant chitinasechiA is obtained by using a nickel column affinity chromatography. After SDS-PAGE analysis, protein bands of the desired size appear near 110 kDa.According to the method for expressing and purifying the low temperature chitinase gene chiA (chitinase A) in the kluyveromyceslactis, the chitinasechiAexpressed is mostly secreted outside cell, thereby reducing the separation and purification cost and improving the expression efficiency.The protein concentration of purified protein chiAis 1.26 mg/mL and the enzyme activity is 51.45 U/mg.The purified chitinaseChiA has been studied in enzymatic properties such as temperature and temperature stability, pH and pH stability and synergistic degradation, and a foundation for industrial application of such enzyme is laid.

The invention relates to an assisted bombyx mori breeding technology, and aims at providing a method for selecting high-reelability bombyx mori cocoons by utilizing a protein molecular marker. The method comprises the following steps: (1) preparing SDSPAGE (sodium dodecyl sulfate polyacrylamide gel electrophoresis) gel, and drilling sample holes on the gel; (2) shearing cocoon shells from breeding cocoons, adding the cocoon shells to an aqueous solution containing urea, mercaptoethanol (BME) and sodium dodecyl sulfonate (SDS), performing water bath treatment at the temperature of 80 DEG C, and absorbing samples for electrophoresis; (3) putting the electrophoresis gel and staining solution in a closed container, incubating at the temperature of 60 DEG C, washing the gel with water, adding a destaining solution, oscillating, changing the destaining solution and oscillating again; and (4) for the cocoon shells which show 110kDa protein bands in electrophoresis results, taking the corresponding breeding cocoons as sample individuals with the Sericin2 protein molecular marker. The method has the advantages that sericin protein Sericin2 is taken as the molecular marker so as to accurately and effectively select the high-reelability individuals, thus greatly improving the reelability of the bombyx mori cocoons and enhancing the breeding efficiency. For the individuals with the labeled protein Sericin2, the reelability percentage of the bombyx mori cocoons is more than 90% and the raising scale of the individuals for seed selection can be reduced by 30-50%.

A chicken intestinal tract Beta-defensin cDNA is characterized in that the cDNA has the following sequence: tcagacagcc agctgtgcag gaacaaccat ggccactgcc ggaggctctg cttccacatg gagagctggg ctgggagctg catgaacggc cgcctgcgct gctgcaggtt ctccaccaag cagccctttt ccaaccctaa acattcagtg ctgcacacag cagagcagga cccttcccca agccttggag ggacgtga. The amino acid sequence of the Beta-defensin is Ser-Asp-Ser-Gln-Leu Cys-Arg-Asn-Asn-His Gly-His-Cys-Arg- Arg Leu-Cys-Phe-His-Met Glu- Ser-Trp-Ala-Gly Ser-Cys-Met-Asn-Gly Arg-Leu-Arg-Cys-Cys Arg-Phe-Ser-Thr-Lys-Gln Pro-Phe-Ser-Asn-Pro Lys-His-Ser-Val-Leu His-Thr-Ala-Glu-Gln Asp-Pro-Ser-Pro-Ser Leu-Gly-Gly-Thr. The extraction method comprises the following steps of: (1) collecting broken mucosa cells of chicken intestinal tract; (2) breaking vesicles; (3) leaching with 5% acetic acid under stirring, centrifuging, collecting supernatant, removing sediment, subpackaging the supernatant and freeze-storing to obtain crude chicken intestinal tract Beta-defensin; (4) separating the supernatant with Sephadex G-100 gel column at low temperature, eluting with 0.2mol/L sodium acetate (constant flow pump speed 3*1), detecting with nucleic acid-protein detector, collecting the eluate with an automatic collector (1.5mL each tube), and recording with a recorder (speed 6cm/h, and range 20mV); (5) detecting the antibacterial activity of the liquid in each tube to Pasteurella with agarose diffusion method, collecting the eluate with bacteriostatic activity, and storing under vacuum freeze drying; (6) purifying the the eluate with bacteriostatic activity with Tricine-PAGE, PVDF membrane blotting the protein bands, and performing amino acid sequence analysis with Sanger partial hydrolysis method; and (7) deriving chicken intestinal tract Beta-defensin cDNA with BLAST software.

The invention relates to a spirulina development and application technology and aims to provide a method for distinguishing the degrees of production traits of a spirulina strain. The method provided by the invention comprises the following steps of: extracting water-soluble protein of spirulina cells with an tris-HCl extracting solution, separating a protein sample by carrying out sodium dodecyl sulphate-polyacrylamide gel electrophoresis, then detecting the light intensity value of a protein band at a 102kD site of a protein electrophoretogram, and constructing a hierarchical diagram among algae plants according to the light intensity value; if the light intensity value of the protein band of a candidate strain at the 102kD site is more than 140 and the candidate strain and a known strain with good production traits get together, indicating that the candidate strain has good production traits and applicable to large-scale cultivation production; and if the light intensity value of the protein band of the candidate strain at the 102kD site is less than 40 and the candidate strain and a known strain with poor production traits get together, indicating that the candidate strain has bad production traits and is not applicable to large-scale cultivation production. The method provided by the invention is simple, efficient, reliable and low in cost, and no complex test and analysis such as nucleic acid sequencing and bioinformatics comparison is carried out, so that the method provided by the invention is applicable to large-scale high throughput screening.

The invention discloses a method for extracting and purifying lycoris radiata lectin from lycoris radiata bulbs and the lycoris radiata lectin produced by the method. The lycoris radiata bulbs are taken as raw materials and are extracted and purified by a specific process to form pure lycoris radiata lectin with a single protein band, and the pure lycoris radiata lectin has the apparent molecular weight of 48KD, is protein consisting of four subunits with the same molecular weight, is amorphous powder and has the lycoris radiata lectin content of 90 percent. The method comprises the following process steps of: (1) preparing raw materials; (2) pulping; (3) performing centrifugal separation for the first time; (4) leaching; (5) performing centrifugal separation for the second time; (6) mixing centrifugal separation solutions 1 and 2; (7) performing fractional precipitation; (8) performing centrifugal separation for the third time; (9) performing dialysis demineralizing for the first time; (10) performing electrochromatophoresis separation; (11) performing molecular sieve chromatography; (12) eluting; (13) performing dialysis demineralizing for the second time; (14) performing vacuum concentration; and (15) performing vacuum drying. The invention provides a method capable of extracting the lycoris radiata lectin, lycoris radiata polypeptides and lycoris radiata gelatin and also capable of extracting and separating total alkaloids of lycoris radiata; the process is simple; and the energy is saved and the consumption is reduced.

The invention discloses an SDS‑polyacrylamide electrophoresis gel, which is characterized in that: acrylamide monomers are mixed with a crosslinking agent methylenebisacrylamide in proportion, and triisopropanolamine, taurine, glycolic acid, A buffer system composed of glycine and tris-hydrochloric acid aqueous solution, and anionic surfactant sodium lauryl sulfate, initiator ammonium persulfate and catalyst tetramethylethylenediamine are added. The SDS-polyacrylamide electrophoresis gel prepared by the method of the present invention not only has good separation efficiency and colloidal performance, but also has high resolution and definition of protein bands, and the separation speed and gelation speed of the colloid are faster than Laemmli gel. Although the traditional Laemmli colloid has excellent performance, it does not possess long-term preservation ability. Compared with the Laemmli colloid, the electrophoretic gel of the present invention can maintain a longer shelf life, and it can still maintain normal separation efficiency when stored at a constant temperature of 37 ° C for more than 12 days. Equivalent to more than one year at 4 °C.

The invention relates to the technique of development and application of spirulina and aims at providing a method for detecting production trait goodness and badness of spirulina strains. According to the method, a Tris-HC1 extracting solution is utilized for extraction so as to obtain water-soluble protein of spirulina cells; protein samples are separated by using sodium dodecyl sulfate-polyacrylamide gel electrophoresis, subsequently the optical density value of a protein zone at 102kD of a protein electrophoresis diagram is detected, and a dendrogram of the spirulina plants is established according to the value; if the optical density value of a candidate strain at the protein zone at the 102kD is larger than 140 and the candidate strain is gathered together with a known stain with good production nature, the stain is good in production nature and is applicable to large-scale cultivation and production; and if the optical intensity value of the protein zone at 102kD is less than 40 and the candidate strain is gathered together with known strains with poor production nature, the stain is poor in production nature and is not applicable to large-scale cultivation and production. The method is simple, efficient, reliable and low in cost, and complex tests and analysis on nucleic acid sequencing and bioinformatics comparison do not need to be carried out, therefore, the method is applicable to large-scale and high flux separation.

The invention relates to the technical field of food, in particular to a method for identifying doping or not of foreign starch in potato food. The method specifically comprises the following steps: extracting proteins in a sample to be measured and a potato noodle standard, then performing measurement by adopting polyacrylamide gel electrophoresis, and judging whether the sample to be measured contains foreign proteins or not and specific foreign starch through protein bands in the sample to be measured and the potato noodle standard. According to the method, the foreign starch to be identified is directly adopted as the standard, so that all information about the proteins in raw noodles can be accurately reflected, detection omission can be prevented, and the accuracy of an identification result can be improved.

The invention relates to a method for obtaining endophytic bacteria for degrading verticillium dahlia toxin protein and an application in preventing and treating plant verticillium wilt, and belongs to the biotechnological field. The method for obtaining endophytic bacteria for degrading verticillium dahlia toxin protein comprises the steps of culturing endophytic bacteria separated from the plant and verticillium dahlia toxin; using polyacrylamide gel electrophoresis to detect protein band after culture, comparing with protein band of the original toxin; and taking mixed culture system without 26KD protein band as a target strain. The method has clear target and mechanism. The method overcomes the shortcomings that the bio-control microorganism in biological control soil borne disease is easily influenced by soil environment and has unstable effect. The method uses pathogenic character of the verticillium dahlia and conduction characteristic of the endophytic bacteria in the plant to directly screen endophytic bacteria for grading verticillium wilt toxin result in plant disease so as to achieve the aim of effectively preventing and treating plant verticillium wilt.