124 results about "Fluorogenic Substrate" patented technology

Compositions and methods for conferring herbicide resistance or tolerance to bacteria, plants, plant cells, tissues and seeds are provided. Compositions include polynucleotides encoding herbicide resistance or tolerance polypeptides, vectors comprising those polynucleotides, and host cells comprising the vectors. The nucleotide sequences of the invention can be used in DNA constructs or expression cassettes for transformation and expression in organisms, including microorganisms and plants. Compositions also comprise transformed bacteria, plants, plant cells, tissues, and seeds. In particular, isolated polynucleotides encoding glyphosate resistance or tolerance polypeptides are provided. Additionally, amino acid sequences corresponding to the polynucleotides are encompassed. In particular, the present invention provides for isolated polynucleotides comprising nucleotide sequences encoding the amino acid sequence shown in SEQ ID NO:2, 4, or 6, or the nucleotide sequence set forth in SEQ ID NO:1, 3, or 5. The present invention additionally provides a method to measure enzyme kinetic activity using fluorogenic substrates.

The present invention concerns a method to detect the presence of an enzyme in in vivo or in vitro tissue or cell, which method comprises:(a) obtaining a tissue or cell sample to be analyzed;(b) contacting the tissue or cell sample with a substrate of the structure selected from the group consisting of:X=H or one or more natural or synthetic amino acids with or without amino blocking groups,Y=H or one or more natural or synthetic amino acids with or without amino blocking groups,wherein X and Y are the same or different and are amino acid sequences of between about 1 to 1,000,000 amino acids wherein each amino acid is the same or a different amino acid, with the proviso that at least one of X or Y is at least one amino acid;(c) when an enzyme is present in the tissue or cell sample which degrades X, Y and combinations thereof, fluorescent cresyl violet is released in the tissue sample producing a color change;(d) detecting the presence and amount of the enzyme present by the detection and quantification of the fluorescence produced; and(e) optionally comparing the fluorescence to a pre-calibrated fluorescence scale to quantify the fluorescence present. A diagnostic kit for use and a method to prepare amino acid cresyl violet derivatives are described.

The invention relates to a method for in vitro determining thrombin activity in a sample wherein the sample is a blood sample and thrombin generation is measured by the steps of: —contacting a layer of said sample with a fluorogenic substrate of thrombin, wherein said layer has a thickness within a range of 0.05 to 5 mm and a surface within a range of 10 to 500 mm2; —allowing thrombin to generate in said sample; —measuring the fluorescence emitted from the surface of the layer, by the fluorescent group released from the fluorogenic substrate as a result of enzymatic action of generated thrombin on said fluorogenic substrate.

A device and method simultaneously detects and enumerates two groups of microorganisms in a test sample, utilizing a single test container. In the container liquid growth media, a chromogenic substrate and a fluorogenic substrate are mixed with the test sample. The test container is incubated to allow bacterial growth and metabolism. Spectral changes of the substrates are dynamically detected using two external light sources aimed at a transparent section of the test container, and a single external photo detector. One light source operates in the visible band and the second in the long ultraviolet band. The two dynamic time patterns generated by the two substrates are analyzed in real time to determine the presence or absence of each microorganisms group and to enumerate their original concentrations in the test sample.

The invention discloses a method for building medicine transport models for research on BCRP (breast cancer resistance proteins) mediation for 3D (three-dimensional) organs of the small intestines of mice. The method includes separating crypts from the small intestines of the mice by means of digestion, suspending the crypts in matrigel and then joining the crypts with cell culture plates and promoting differentiation of the crypts by the aid of ADMEM/F12 media with Respondin-1, m-noggin and m-EGF cell differentiation growth factors to form the 3D organs; carrying out morphologic observation and detecting the expression level of BCRP genes and proteins to verify the feasibility of model theories; carrying out research on the trans-membrane transport activity of BCRP in the 3D organs by the aid of fluorescent substrates Hoechst 33342 of the BCRP and inhibitors Ko143 or YHO-13177 of the fluorescent substrates by co-incubation processes. The method has the advantages that the medicine trans-cell-membrane transport in-vitro models for the research on the BCRP mediation for the 3D organs of the small intestines of the mice are built for the first time, and the method for building the models is easy and convenient to implement and high in detection efficiency and speed and can be widely applied to screening BCRP substrates and inhibitors in an in-vitro manner.

The invention discloses a high throughput screening method of aminopeptidase and a high-yield strain thereof, relates to a high throughput screening method of aminopeptidase and a high-yield microorganism bacterial strain thereof. The method comprises the following steps of: vaccinating a single colony in the hole of a deep-hole plate I on a medium containing a seed liquid, performing shaking cultivation, vaccinating the seed liquid in the hole of the deep-hole plate I correspondingly into the hole of a deep-hole plate II equipped with a fermentation medium, performing shaking cultivation, and centrifuging the deep-hole plate II to obtain the supernatant crude enzyme; adding a buffer solution and a chromogenic substrate solution or fluorogenic substrate solution in the micropore of an elisa plate, adding the dilute crude enzyme to be tested, carrying out water-bath reaction for 10-30 minutes at 30-70 DEG C, adding a 30-50% acetic acid solution immediately after the water-bath reaction and terminating the reaction; and measuring the absorbance or fluorescence intensity of the reaction liquid by a microplate reader, and calculating the enzyme activity according the standard curve and the dilution ratio of the crude enzyme. According to the invention, the goals of high throughput cultivation, high throughput preparation of crude enzyme and the high throughput test of the enzyme activity are achieved.

The invention belongs to the technical field of biology, in particular to a fluorogenic substrate for detecting ADAMTS13 enzymatic activity and a detection method. The fluorogenic substrate for detecting the ADAMTS13 enzymatic activity comprises an amino acid sequence shown as SEQ ID NO:2, and sulfydryl of cysteine at the 4 position and the 15 position at the N end of the amino acid sequence is combined with fluorescein-5- maleimide. Q1599C of the fluorogenic substrate is closer to N1611C modified site, simultaneously the N-end sequence of the fluorogenic substrate does not contain extra amino acid GS, and enzymolysis can be conducted on the fluorogenic substrate through ADAMTS13 more effectively. Therefore, sensitivity for detecting ADAMTS13 enzymatic activity can be improved. The method for detecting the ADAMTS13 enzymatic activity is convenient to operate, accurate in detection result, high in sensitivity and suitable for quick detection of the ADAMTS13 enzymatic activity in blood plasma in hospitals, health departments and medical research and development institutions at different levels.

The invention relates to a new fluoroimmunoassay method for human thymidine kinase fluoroimmunoassay based on magnetic nanometer grains. The invention sets up a quick and simple immunological detecting technology for the high flux human thymidine kinase (hTK1), and the technology is used for the hTK1 clinical examination. The hTK1 is fixed with covalence on the surface of an amido silanization superparamagnetism nanometer grain immobilized carrier through glutaric dialdehyde, a competitive immunoassay method is adopted, horse radish peroxidase is used as an enzyme labeling, ethyl-para-hydroxyphenyl acid is used as a fluorogenic substrate, thereby realizing the detecting for the hTK1. The amido silanization nucleocapsid-shaped magnetic nanometer grains are evenly dispersed in liquidoid, thereby having the advantages of fixation and uniformity, high specificity, good repeatability, quick reaction velocity, etc., under the action of an adscititious magnetic field, the invention can effectively realize the separation and enrichment of the immune complex and the reaction liquid of the nucleocapsid-shaped magnetic nanometer grains, the operation of the analytical method is simple, accurate, sensitive and fast, automatic detection is easy to be realized, and large batch of test task can be completed.

A growth plate or Petri plate and a method for detection and identification of microorganisms by specific or non-specific staining of colonies or microcolonies is described. Analytical substances (chromogenic or fluorogenic substrates, biochemical dyes, dyes indicators of pH, antibiotics and other biological active substances) are applied to the lower surface of a nutrient agar layer. The substances diffuse in the agar, reach cells and react with them. Because colonies or microcolonies are not removed from the media, they retain their shape, color, size and other useful characteristics for analytical purposes.

The invention provides a method for detecting aflatoxin B1. The method is based on a direct competitive ELISA (enzyme-linked immunosorbent assay) technique, firstly, monoclonal antibodies are coated, a to-be-detected sample and aflatoxin B1 labeled with catalase C100 are added, aflatoxin B1 in the sample and the aflatoxin B1 labeled with catalase C100 are competitively combined with the monoclonal antibodies fixed on an ELISA plate, fluorescence quenching of cadmium telluride quantum dots modified with mercaptopropionic acid is reduced through decomposition of hydrogen peroxide under the catalytic function of catalase, and the content of aflatoxin B1 in the sample is judged according to the fluorescence intensity. According to the method, new catalase is introduced innovatively, and the reaction precision is improved while the cost is reduced; meanwhile, a more sensitive novel fluorogenic substrate, namely, the cadmium telluride quantum dots modified with mercaptopropionic acid, is adopted, and the lighting sensitivity is remarkably improved by comparison with traditional TMB (tetramethylbenzidine) substrates.

Provided herein are imaging methods for detecting, diagnosing and imaging pathogenic bacteria or a pathophysiological condition associated therewith using fluorescent, luminescent or colorimetric detection agents, e.g., fluorogenic substrates for bacterial enzymes, caged luciferins and fluorescent proteins, luciferases and enzymes expressed by recombinant bacteria. Signals emitted by the fluorescent, luminescent or colorimetric detection agents in the presence of the bacteria are compared to controls to detect and locate the pathogenic bacteria. Also provided is a method for screening therapeutic agents to treat the pathophysiological conditions by measuring fluorescence or luminescence emitted from the detection agents in the presence and absence of the potential therapeutic agent. In addition, a method for detecting a pathogenic bacteria via PET or SPECT imaging using a positron-emitting or gamma-emitting substrate for a beta-lactamase or other enzyme or protein of the pathogenic bacteria. Further provided are the fluorogenic substrates CNIR-7 or CNIR7-TAT or the radiolabeled substrates.

The invention relates to fluorescence methods for measuring enzyme activity, in particular enzyme cleaving and joining activities. The invention also relates to fluorogenic substrates which are useful for measuring enzyme activity and as in vitro and in vivo imaging probes.

Provided herein are imaging methods for detecting, diagnosing and imaging pathogenic bacteria or a pathophysiological condition associated therewith using fluorogenic substrates for bacterial enzymes. Fluorescent, luminescent or colorimetric signals emitted by substrates or enzyme products in the presence of the bacteria are compared to controls to detect and locate the pathogenic bacteria. Provided is a method for screening therapeutic agents to treat the pathophysiological conditions by measuring a signal emitted from the fluorogenic substrates or products in the presence and absence of the potential therapeutic agent. In addition, a diagnostic method for detecting a mycobacterial infection in a subject by contacting biological samples with a fluorogenic substrate and imaging for signals emitted from a mycobacterial beta-lactamase product. Provided are fluorogenic substrates CC1, CC2, CHPQ, CR2, CNIR1, CNIR2, CNIR3, CNIR4, CNIR5, CNIR5-QSY22, CNIR7, CNIR9, CNIR10, CNIR-TAT, CDC-1, CDC-2, CDC-3, CDC-4, CDC-5, XHX2-81, XHX2-91, XHX3-26, or XHX3-32 or a derivative thereof.

The invention provides a method for detecting escherichia coli O157:H7. According to the method, firstly, escherichia coli O157:H7 and coated polyclonal antibodies are combined, then connected with biotinylated monoclonal antibodies and connected with catalase C100 labeled with streptavidin, fluorescence quenching of cadmium telluride quantum dots modified with mercaptopropionic acid is reduced through decomposition of hydrogen peroxide under the catalytic function of catalase, and the concentration of escherichia coli O157:H7 in a sample is judged according to the fluorescence intensity. The method is based on a double-antibody sandwich enzyme immunoassay technique and adopts a biotin-avidin system for amplifying a reaction. More importantly, a novel antibody labeling enzyme (catalase C100) and a more sensitive fluorogenic substrate (cadmium telluride quantum dots) are adopted and matched with an effective reaction condition, accordingly, the detection sensitivity is remarkably improved, the cost is reduced, the detection efficiency is improved, and the method has good popularization prospect.

The invention relates to a method for detecting beta-lactamase in a dairy produce. The method is characterized in that a fluorescence substrate probe which can be specifically catalyzed by beta-lactamase is designed, and the main structure of the fluorescence substrate probe is chemically synthesized through using the mother ring of fluorescein and beta-lactam antibiotic. The beta-lactamase can catalyze the fluorescence substrate probe to emit strong fluorescence, and the content of beta-lactamase is calculated according to the fluorescence intensity obtained through a reaction. 0.1ng/mL of Beta-lactamase can be detected through the method, the sensitivity of the method is two orders of magnitude higher than that of traditional ELISA methods, the detection time is shortened to 45min, and the method also has the advantages of strong specificity, high sensitivity, simplicity, rapid detection, and great reduction of the detection cost.

The subject invention provides compounds useful as fluorogenic substrates for the hydrolytic enzymes. Upon hydrolysis of the hydrolyzable group, a halo-pyrene substituted molecule is developed which is highly fluorescent, water soluble and exhibits several desirable characteristics, including a large Stokes' shift.

Disclosed are fluorogenic substrates for measuring ADAMTS13 activity or ADAMTS13 inhibitor activity. Substrates can comprise an oligopeptide which can consist of up to 80 amino acids of sequence of von Willebrand Factor (VWF). The oligopeptide can include modifications of sequence of VWF, including an amino-terminal glycine, a scissile Y-M peptide, and a cysteine substitution located from 1 to 12 amino acids from the scissile Y-M in the carboxy terminal direction. A substrate can further comprise a fluorophore and a fluorescence quencher bound to the oligopeptide on opposite sides of the scissile Y-M peptide, wherein the fluorescence quencher is not identical to the fluorophore. An oligopeptide can be encoded by a nucleic acid sequence which can also encode a His tag. An oligopeptide can be expressed in a cell or microorganism. Also disclosed are methods of using a fluorogenic substrate to measure ADAMTS13 activity or ADAMTS13 inhibitor activity.

The invention discloses a reagent for rapidly detecting lipase in a dairy food. The reagent comprises a solution A, a solution B and a standard substance, wherein the standard substance is methoxyl resorufin, the solution A is a PBS, and the solution B contains a fluorogenic substrate, a buffer solution, an emulsifying agent and a preservative. The invention further discloses a method for rapidly detecting lipase in the dairy food by using the reagent. The method comprises the steps: drawing a standard curve, reading a sample fluorescence value and calculating the lipase enzyme. According to the method, the sensitivity is high, the operation is simple, the workload is small, the system errors are small, multiple test repeatability is good, rapidness and convenience are achieved, and a detection result can be obtained within 20-60min.

The invention discloses a method for detecting an activated blood coagulation factor XI in human intravenous immunoglobulin. The method comprises the steps as follows: (1) mixing an IVIG (intravenous immunoglobulin) sample with specially-preprocessed platelet-poor plasma (PPP); (2) adding a thrombin specific fluorogenic substrate with a phospholipid agent into a reaction system; (3) adding an initiation factor for starting a TGT (thrombin generation test), wherein the initiation factor comprises a calcium ion source and the phospholipid agent; (4) obtaining a thrombin generation curve providing parameters by the optimized reaction system; and (5) negatively correlating the peak time of thrombin (TTP) of the detected sample with the FXIa (activated blood coagulation factor XI) level in the sample. The FXIa level in the detected sample can be indirectly obtained by comparing the TTP of the detected sample with that of an FXIa standard sample. The method is suitable for detecting residual micro FXIa in human intravenous immunoglobulin (IVIG) products and is used for extracorporal evaluation of thrombosis risk of related products.

The invention relates to a preparation method of an enzyme-linked immunosorbent assay kit for detecting an ovarian cancer tumor marker CA125 based on a trypsin fluorogenic substrate. An enzyme-linked immunosorbent assay technology and a fluorescent detection technology are combined to prepare a detection probe through trypsin and a tumor marker corresponding antibody Ab2; the probe, the tumor marker and another tumor marker antibody Ab1 embedded into the enzyme-linked immunosorbent assay (ELISA) kit can form a structure similar to a sandwich through the action between antigens of the antibodies; finally fluorescence is generated through the action between enzyme and the fluorescent substrate to qualitatively and quantitatively detect the ovarian cancer related tumor marker CA125, and a novel method for detecting protein markers is established. The preparation method has the characteristics that the whole preparation process is simple and suitable for industrial production; the protein markers can be qualitatively and quantitatively detected according to the fluorescent characteristics of the fluorogenic substrate and the action of the fluorogenic substrate with the enzyme, and the specificity is good; the whole detection process is low in cost and very convenient to operate; the novel method for detecting the protein markers is established.

A method for measuring a generation of thrombin in a sample of whole blood as a function of time includes adding to a sample of whole blood a fluorogenic substrate and a thrombin activator to form an activated sample. A conversion product is permitted to form in the activated sample. Fluorescence is measured as a function of time from a fluorescent group that is released during the formation of the conversion product with the use of a fluorescence detector. The fluorescence detector operates in an extended range mode and has an increased sensitivity. Thrombin generation as a function of time can then be calculated from the measured fluorescence as a function of time.

Provided herein are methods for detecting, quantifying, differentiating, diagnosing and imaging pathogenic bacteria or condition associated therewith using substrates for bacterial enzymes. Fluorescent, luminescent or colorimetric signals emitted by substrates or enzyme products in the presence of the bacteria are compared to controls to detect and locate the pathogenic bacteria. Provided is a method for screening therapeutic agents to treat the pathophysiological conditions by measuring a signal emitted from the substrates or products in the presence and absence of the potential therapeutic agent and a diagnostic method for detecting a mycobacterial infection in a subject by contacting biological samples with a substrate and imaging for signals emitted from a mycobacterial beta-lactamase product. Also provided are fluorogenic substrates or substrates comprising a colored dye or a chemical reagent effective to induce a color or pH change.