90 results about "Beta-glucuronidase" patented technology

The invention discloses a method of simultaneously determining contents of 1-OHP ,3-OHB[a]P and 3-OHB[a]A in urine. The method comprises sequentially using beta-glucuronidase for enzymatic hydrolysis of samples, performing solid-phase extraction and purification, concentrating the samples with a vacuum rotary evaporator, and determining by using a liquid chromatography-tandem mass spectrometer, thereby rapidly, accurately and simultaneously detecting contents of 1-hydroxy pyrene (1-OHP), 3-hydroxy benzo [a] pyrene (3-OHB [a] P) and 3-hydroxy benzo [a] anthracene (3-OHB [a] A) in the urine. The method uses deuterated standards as quantitative analysis substances of internal standards and thus can reduce errors in a pretreatment process for the samples; uses a tandem mass spectrometer to relatively improve selectivity and accuracy of the method; and selects a method of preparing standards by matrices, wherein, compared with a method of preparing the standards by pure water, the method of preparing standards by matrices is relatively good in accuracy and can eliminate interference from matrix effects. Through selecting and optimizing chromatographic columns and gradient elution conditions, the method relatively improves a chromatogram separating process and shortens a chromatographic analysis time.

The invention relates to a method and a kit for quantitatively measuring the beta-glucuronidase in multiple samples by an enzyme-linked immunosorbent assay (ELIASA) instrument. The kit internally comprises beta-glucuronidase standard substance, working solution, phenolphthalein glucuronic acid reaction liquid, termination reaction reagent, a pH meter and the like. The method and the kit have the advantages that the concentration of the beta-glucuronidase in the multiple samples can be detected at the same time, and shorter detection time is consumed; the sensitivity is high, and the detection limit is 39.0625U/ mL; the method is wide in linear range, the detection concentration is within the range of 39.0625-12500U/mL, and the three order of magnitudes are spanned; the accuracy is high; less reagent and fewer samples are used; the kit is convenient to operate; the samples can be fed once without being fed for a plurality of times; the cleaning step is omitted, so that the operation steps are reduced, cross contamination is prevented, and the result is guaranteed to be credible; the detected samples can be well stored so as to be repeatedly detected.

The invention relates to a method for producing glycyrrhetinic acid monoglucuronide (GAMG) through intermittent feed supplement fermentation, belonging to the technical field of biological transformation. The method specifically comprises the steps of: firstly, cultivating and inducing microorganisms capable of inducing to generate beta-glucuronidase in a seed culture medium and a fermentation culture medium containing glycyrrhizic acid to obtain corresponding beta-glucuronidase; and secondly, specifically splitting a terminal glucosidic bond in a glycyrrhizic acid molecular structure by using the beta-glucuronidase generated by the microorganisms through induction, generating the GAMG, and secreting the GAMG to a fermentation solution and intermittently replenishing glycyrrhizic acid and inorganic salts as a substrate for multiple times. Through replenishing the glycyrrhizic acid and the inorganic salts as the substrate, nutrient substances are replenished, thallus can grow in a proper environment and promote the synthesis of a target product; and after the fermentation is ended, the yield of the GAMG reaches 13-24g/L. According to the method disclosed by the invention, the fermentation yield of the GAMG can be effectively increased, the transformation period is prolonged, the equipment utilization rate is increased, and the product production cost is reduced.

The invention provides a kit for detecting aerobic bacteria in vaginal discharge, a dried kit comprises a reactor for detecting the enzyme activity of beta-glucuronidase and coagulase and color-developing agent, and a humidified kit comprises beta-glucuronidase substrate solution, coagulase substrate solution and color-developing agent. The invention also provides a preparation method of the kit. The kit in the invention directly identifies the aerobic flora, in particular to the aerobic floras such as staphylococcus aureus, Enterococcus faecalis, streptococcus group B, Escherichia coli and the like which can cause aerobic bacteria vaginalitis in vaginal discharge by detecting the activity of beta-glucuronidase and coagulase. The method has simple, convenient and rapid operation and high accuracy, and is suitable for convention application in clinics especially in hospital outpatient.

Disclosed are prodrugs of inactivators of O⁶-alkylguanine-DNA alkyltransferase (AGT). The prodrugs are cleavable by the β-glucuronidase enzyme, which is either administered to the patient or produced by necrotic tumor cells. The prodrugs are represented by the formula A-B-C, wherein A is a glucuronosyl residue linked through its 1-oxygen to the phenyl ring of B; B is a benzyloxycarbonyl group, optionally ring-substituted with one or more electron withdrawing groups; and C is an inactivator of AGT, e.g., a substituted or unsubstituted O⁶-benzylguanine or O⁶-benzyl-2′-deoxyguanosine, Also disclosed are additional inactivators of AGT, pharmaceutical compositions comprising an inactivator or prodrug and a pharmaceutically acceptable carrier, and a method of use of the inactivator or prodrug in enhancing the chemotherapeutic treatment of tumor cells in a mammal, e.g., a human, with an antineoplastic alkylating agent that causes cytotoxic lesions at the O⁶-position of guanine.

Mutated Staphylococcus sp. RLH1 β-glucuronidase enzymes with enhanced enzymatic activity and thermostability as compared to wild type enzyme are provided. The enzymes of the invention advantageously allow for accurate analysis of bodily samples for the presence of drugs in 30 minutes or less, as compared to the several hours needed using prior enzyme preparations. Methods of using the mutated enzymes for hydrolysis of glucuronide substrates, including opiates and benzodiazepines, are also provided.

A set of oligonucleotide probe for detecting the enterohemorrhagic E. coli O157:H7 and cholera vibrio O139 is designed on the Shiga-like toxin generating gene stx1 or stx2 and the beta-glucuronidase gene uidA of said enterohemorrhagic E coli O157:H7 and the enterotoxin A subset (ctxA), toxicity coordinate pilus A subset (tcpA) and glucosyltransferase (LPS gt) genes of cholera vibrio O139, and has high sensibility and specificity. It can be used to detect the enterohemorrhagic E. coli O157:H7, cholera vibrio O139 and other pathogenic genes from the specimen.

The invention discloses beta-glucuronidase, as well as a gene, an expression vector and a transformant of beta-glucuronidase, and applications in preparing glycyrrhetinic acid monoglucuronide (GAMG). The gene sequence of the beta-glucuronidase is shown as SEQ ID No.1. After the gene is bonded to the expression vector, the obtained product is transformed into pichia pastoris, and thus a pichia pastoris engineering strain is obtained. When the beta-glucuronidase recombinase expressed by the engineering strain is used for preparing GAMG, the result shows that the enzyme has the advantages that the specificity of the substrate is high, no by-product, namely, glycyrrhetinic acid is generated, and the yield of GAMG is about 95%, which proves that beta-glucuronidase and the gene of the beta-glucuronidase have good application prospects in production of GAMG.

The invention discloses an aerobic and bacterial vaginosis combined determination kit and a preparation method thereof. The kit comprises a color-developing agent and a reaction device, wherein the reaction device comprises a hydrogen oxide reaction pad, a neuraminidase reaction pad, a leucocyte esterase reaction pad, a beta-glucuronidase reaction pad and a coagulase reaction pad. Sample liquid is sucked by using straw, one drop of the sample liquid is dropwise added on each of the hydrogen oxide reaction pad, the neuraminidase reaction pad, the leucocyte esterase reaction pad, the beta-glucuronidase reaction pad and the coagulase reaction pad of the reaction device, the volume of each drop of the sample liquid is 30 mu l, after the reaction device is put into a water bath at a temperature of 36-38 DEG C or a dry bath at a temperature of 48 DEG C to carry out color developing for 15 minutes, one drop of color-developing liquid A is added on the neuraminidase reaction pad, one drop of color-developing liquid B is added on the coagulase reaction pad, and 30 seconds later, a result is shown. Thus, an effect of simultaneously detecting hydrogen oxide, neuraminidase, leucocyte esterase, beta-glucuronidase and coagulase to diagnose aerobic and bacterial vaginosis can be achieved.

The invention relates to a method for using alginic acid-calcium carbonate hybrid gel to immobilize beta-glucuronidase, wherein, calcium carbonate powdered precipitation is generated by mixing and stirring sodium carbonate solution and calcium chloride solution at room temperature, and then kept, washed by water and acetones and dried, and micron mesoporous calcium carbonate particles are obtained which are added into trihydroxymethyl aminomethane-hydrochloric acid (Tirs-HCl) buffer of beta-glucuronidase or aqueous solution thereof for absorption, and calcium carbonate particles absorbing glucuronidase are obtained after centrifugal separation, then uniformly mixed with sodium alginate solution and added into calcium chloride solution by dropping for aging. The invention has the advantages of mild preparation conditions, simple and easy preparation technologies, good immobilization ability of obtained hybrid vectors on enzymes, low leakage rate of immobilized beta-glucuronidase, low swelling capacity and good reusage stability.

The invention discloses a [beta]-glucuronidase mutant with improved thermostability, and belongs to the field of bioengineering. [Beta]-glucuronidase, which is derived from talaromyces pinophilum Li-93 (preservation number is CGMCC No.11765), undergoes site-specific mutagenesis, so that the mutation of valine on the 212th site, threonine on the 220th site, cysteine on the 238th site and valine onthe 348th site, which are coded by the [beta]-glucuronidase, into arginine is promoted; and 23 amino acids at the N terminal of the enzyme ([beta]-glucuronidase) are cut off, and a recombinant plasmidof mutant gene is transformed in pichia pastoris GS115 and is expressed, so that the [beta]-glucuronidase mutant with improved thermostability is obtained. According to the [beta]-glucuronidase mutant provided by the invention, half-life periods under 55 DEG C and 70 DEG C are prolonged by 81min and 25min in comparison with wild type, namely 3 times and 2.3 times as much as that of the wild type.A process of pyrolytic conversion GL is established on the basis of the mutant. The [beta]-glucuronidase mutant provided by the invention has a broad industrial application prospect.

The present invention relates to magnetic resonance imaging (MRI) contrast agent. In particular, the present invention provides MRI contrast agents that are sensitive to the enzyme beta-glucoronidase. The MRI contrast agents provide compositions and methods for non-invasive diagnostic imaging of tissues, including necrotic tumors.

Mutated β-glucuronidase enzymes with enhanced enzymatic activity and thermostability as compared to wild type enzyme are provided. The enzymes of the invention advantageously allow for accurate analysis of bodily samples for the presence of drugs in 30 minutes or less, as compared to the several hours needed using prior enzyme preparations. Methods of using the mutated enzymes for hydrolysis of glucuronide substrates, including opiates and benzodiazepines, are also provided.

The invention relates to a method for rapidly detecting steroid hormones in urea through an UPLC-MS/MS technology, and belongs to the field of analysis chemistry and medical science. The concentrations of estriol, hydrocortisone, 17beta-estradiol, testosterone and progesterone in human urea are simultaneously detected through the UPLC-MS/MS technology by adopting a beta-glucuronidase enzymatic hydrolysis technology, the detection limit is 0.1-1.0 ng/mL, and the quantitation limit is 0.3-3.0 ng/mL. The method is fast, sensitive and accurate, can meet requirement of simultaneous detection of above five steroid hormones in urea, and has wide application prospect.

A number of human beta-glucuronidase variants having higher enzymatic activity at physiological pH as compared with wild-type beta-glucuronidase and uses thereof in prodrug therapy. Also disclosed herein is a method for identifying enzyme variants having elevated enzymatic activity using a mammalian surface display system.

The invention relates to a promoter for the specificity expression and the later development expression of a plant tissue and application thereof, belonging to the biotechnology field. In the invention, a promoter sequence of a cotton cyclopropane fatty acid synthase with the length of 2.6kb is obtained. Place analysis proves that the promoter sequence contains a CAAT box, a TATA box, a cupric ion induced expression element, a pathogenicbacteria induced expression element, a dry response element, a cold stress response element, and the like as well as some root specificity expression elements and floral organ specificity elements. After GUS (beta-Glucuronidase) is dyed, a traditional gene is specially expressed at a later development stage by the promoter, and the expression parts are only restricted at a stem base part, a root and an anther.

Nucleic acid molecules encoding fungal β-glucuronidases are provided. Gene products, expression vectors and host cells suitable for expressing β-glucuronidase are also provided. In addition, uses of the β-glucuronidase as a visual and as a selectable marker for transformation are also described.

The invention provides a method for extracting bilirubin from ox bile by using a fermentation process. The method mainly comprises the following four steps: fermenting ox bile, sterilizing an ox bile fermentation solution, forming bilirubin, extracting and refining bilirubin. By virtue of the method, high-yield beta-glucuronidase and ox-bile-resistant clostridium perfringens are added into the animal ox bile and fermented; a mercaptoalcohol reducing agent is added, so that the effects of improving the activity of beta-glucuronidase and ox-bile-resistant clostridium perfringens and resisting oxidants are implemented; the overall process is greatly optimized under the control of the special condition; the production efficiency is improved; the cost is reduced; the yield of the finally prepared bilirubin is 0.010-0.014%; and the purify of the bilirubin reaches over 92%.

The invention relates to a fluorescence probe based on beta-glucuronidase of acridone and application of the fluorescence probe, belonging to the technical field of biological medicines. The fluorescence probe can be used for determining the enzyme activities of beta-glucuronidase in biological systems of different sources. HC-glu is taken as a specific probe reaction substrate, beta-glucuronidasehydrolysis reaction is taken as a probe reaction by virtue of a beta-glucuronidase in-vitro reaction system, and the activity of beta-glucuronidase in each biological sample is determined by quantitatively detecting the generation amount of an aglycone metabolite in a unit time. The fluorescence probe can be applied to the qualitative and quantitative determination of the activities in beta-glucuronidase of different individual sources of human and animal tissue samples, different species of cells and cell preparation objects and various plants and microorganisms, and the evaluation of the drug treatment capacity of beta-glucuronidase and the development and screening of a beta-glucuronidase inhibitor can be realized.