16 results about "Putrescine" patented technology

The invention discloses a composition for promoting bulb expansion of hippeastrum hippeastrum, the composition is an aqueous solution, the solute in the composition comprises putrescine, spermidine, spermine, triacontanol, ethanol, Tween 80, sodium lignin sulfonate and ethylene glycol, and the dosage ratio of the materials is 10: 1: 2: 0.05: 10: 5: 3: 2 according to the dosage weight. And diluting the composition with water to obtain a diluent with the mass percent concentration of 0.04-0.06%. The diluent is used for foliage spraying and seedball base irrigation in the germination stage, the growth stage, the flowering stage and the post-flowering rejuvenation stage of hippeastrum hippeastrum, the seedball diameter of hippeastrum hippeastrum can be remarkably increased, and economic benefits are increased.

The invention belongs to the technical field of tea tree gene application, and particularly relates to application of a tea tree CsPHT gene in improving tea geometrid and colletotrichum gloeosporioides resistance of a tea tree. The invention discloses a tea tree CsPHT gene, the nucleotide sequence of the tea tree CsPHT gene is as shown in SEQ ID NO.1, the tea tree CsPHT gene codes 434 amino acid residues, and the amino acid sequence of the tea tree CsPHT gene is as shown in SEQ ID NO.2. The CsPHT gene is proved to be capable of catalyzing biosynthesis of tea tree defense related compounds such as feruloyl putrescine, coumaroyl putrescine and cinnamoyl putrescine for the first time, and the conservation of the catalytic function of the CsPHT gene is proved through heterologous expression. An in-vivo instantaneous function verification result of a tea tree shows that the over-expression of the CsPHT gene can significantly improve the resistance of the tea tree to tea geometrid and tea anthracnose bacteria. The CsPHT gene is proved to be a key positive regulation factor for regulating the resistance of the tea tree to the tea geometrid and the tea anthracnose fungus. The invention provides important gene resources and molecular targets for cultivating new varieties of high-resistance and multi-resistance tea trees.

The invention discloses a dual-mode sensor for detecting putrescine in food as well as a preparation method and application of the dual-mode sensor. The dual-mode sensor (CDs / AuNCs) is composed of carbon dots (CDs) and gold nanoclusters (AuNCs), and putrescine can be rapidly and sensitively detected within 20 seconds. The interaction of putrescine and the sensor results in an increase in the fluorescence intensity of CDs at 430 nm and 525 nm, which is caused by the aggregation-induced emission (AIE) effect of CDs and the internal filter effect (IFE) of AuNCs. The detection limit of the CDs / AuNCs to putrescine in a ratio fluorescence mode is as low as 0.44 mu M, and the CDs / AuNCs has excellent selectivity and anti-interference performance. CDs / AuNCs also show good colorimetric linear response to putrescine, and the detection limit is 0.72 mu M. Finally, the CDs / AuNCs realizes rapid and accurate detection of putrescine in prawn meat by means of a smart phone, and shows the potential of food spoilage detection.

The present application relates to the technical field of cosmetic biotechnology and nano-carrier drug delivery, and provides PDRN-putrescine co-delivery nano-liposome as well as a preparation method and application thereof.The PDRN-putrescine co-delivery nano-liposome provided by the present application comprises the following components in mass fraction: 0.1-3% of polydeoxyribonucleotide; 0.1-3% of putrescine; 2-8% of phospholipid emulsifier; 0-15% of polyhydric alcohol cosolvent; and the balance is a buffer solution; and the buffer solution has a pH value of 6-7.5.The present application realizes stable co-encapsulation of PDRN and putrescine by constructing a specific buffer system to regulate the pH value, using the amphiphilic property of the phospholipid bilayer and the in-situ ion pair technology, solves the compatibility problem of PDRN and putrescine, significantly improves the transdermal absorption rate of PDRN through transmembrane delivery of the nano-carrier, and realizes the synergistic repair and anti-aging effect of PDRN and putrescine at the cellular level.

The application discloses a kind of meat freshness rapid test paper, belong to food rapid detection technical field.The test paper is with water absorption filter paper as base material, and is loaded by the reaction color developing system consisting of o-Phthaldehyde, mercapto glycolic acid, sodium acetate buffer and fast blue B salt, can occur specific color reaction with the biological amine (putrescine) generated in the meat spoilage process, and realizes freshness rapid judgment by color ladder change.The detection time of the application is only 3-5 minutes, without large instrument, simple operation, high sensitivity, low cost, wide spectrum, can be used for on-site rapid screening of pork, beef, mutton, frozen shrimp, frozen chicken breast and other various meats, and is widely applicable to raw material acceptance of meat processing enterprises, market supervision law enforcement and cold chain logistics quality monitoring.

The invention discloses application of putrescine as a molecular marker in preparation of a reagent for evaluating the severity of alcohol use disorder. The reagent is used for detecting the content of putrescine in a sample. By detecting the putrescine content in the excrement sample of the tested person, the alcohol use disorder severity of the person can be evaluated, and the method has important clinical significance for formulating a better diagnosis and treatment scheme.

The present application belongs to the field of wheat growth regulation, and particularly relates to a wheat growth regulation method. In view of the technical problem of negative correlation between the growth cycle and yield of wheat, a new method for cultivating wheat is provided. The present application sprays putrescine on the wheat ear, which can effectively shorten the growth cycle of wheat while ensuring the stability of effective tiller number, thousand-grain weight and ear grain number, and avoiding yield loss. The mechanism of action of putrescine may match the endogenous putrescine metabolism characteristics of wheat, realize the synergy of growth regulation and yield maintenance, and effectively improve the protein content.

The invention relates to the field of biological pharmacy, in particular to a composition for cell-free protein synthesis and application thereof. The composition for cell-free protein synthesis comprises multiple of the following components: ribonucleic acid, folic acid, oxalic acid, putrescine, spermidine, potassium salt, magnesium salt, ammonium salt, amino acid, PEG8000 and a cell extract. According to the preparation method of the antibody coupling medicine, the raw materials are simple and easy to obtain, the universality is high, and the problems that in a traditional method, a full-length antibody has four pairs of disulfide bonds which are conveniently used for fixed-point coupling, and a single-domain antibody has no exposed disulfide bonds and is not prone to fixed-point coupling can be solved; therefore, the preparation method of the antibody coupling medicine can easily obtain the single-domain antibody coupling medicine with fixed-point coupling, good uniformity and various DAR values.

A method for ratiometric detection of putrescine using PtPd NPs@TPE fluorescent nanozymes. This invention first utilizes mesoporous platinum-palladium nanoparticles (PtPd NPs) doped with tetraphenylethylene (TPE) to obtain fluorescent nanoparticles (PtPd NPs@TPE) with oxidase-like activity, which can produce blue fluorescence under 365 nm ultraviolet light excitation. Secondly, this invention utilizes the antioxidant properties of putrescine solution to inhibit the formation of 2,3-diaminophenazine (DAP), an oxidation product, during the oxidation of o-phenylenediamine (OPD) by PtPd NPs@TPE, thereby reducing the DAP content. Based on the relationship between putrescine concentration and the colorimetric intensity of DAP, and the ratio of the yellow fluorescence intensity of DAP at 552 nm to the blue fluorescence intensity of PtPd NPs@TPE at 442 nm, a novel ratiometric fluorescence method for detecting putrescine is constructed. This method can be used to detect actual samples such as dried bean curd, with a detection limit as low as 0.0025 μg / mL.

This invention belongs to the fields of bioinformatics and medical testing technology, specifically relating to a combination of biomarkers related to the postoperative prognosis of colorectal cancer and their application and prediction system. This invention, through 16S rRNA gene sequencing of tumor mucosal samples from colorectal cancer patients, combined with long-term postoperative follow-up data and screening, found that *Peptostreptococcus*, *Fusobacterium*, *Bacteroides*, *Porphyromonas*, and *Prevotella* are closely related to postoperative recurrence of colorectal cancer, with an AUC of 0.81 for assessing postoperative recurrence. Based on this, this invention conducts non-targeted metabolomics analysis, finding that combining alanine glutamate, putrescine, arginine, histidine, and sebacic acid with the above microbial biomarkers can improve the AUC to 0.91, significantly enhancing accuracy, specificity, and precision. This enables prognostic stratification of recurrence-free survival in colorectal cancer patients, demonstrating higher predictive efficacy and stability.

To provide a method capable of conveniently and accurately determining stress.SOLUTION: The present invention provides a method for acquiring stress determination data, the method including measuring a stress determination marker that includes at least one selected from pyruvic acid, nicotinamide, Ile, N-acetyl-β-alanine, 2AB, choline, Val, uracil, xanthine, estrone, inosine, adenosine, and Leu in a biological sample derived from a subject, or includes a combination of at least one selected from propionic acid, spermine, 3-methylbutanoic acid, 4-methyl-2-oxopentanoic acid, diethanolamine, putrescine, and body temperature together with at least one of the above.SELECTED DRAWING: Figure 1

To provide an improved serum-free animal cell culture medium that can be used for production of a protein of interest.SOLUTION: Inclusion of ornithine, either with or without putrescine, in serum-free cell culture medium ("OS" medium) increases cell viability and density, decreases cell doubling time, and allows for high titer protein production by these cells.SELECTED DRAWING: None

The application is a divisional application of "ornithine decarboxylase mutant, gene, recombinant plasmid, recombinant strain and application", relates to the technical field of genetic engineering and enzyme engineering, and particularly relates to an ornithine decarboxylase mutant, gene, recombinant plasmid, recombinant strain and application. The ornithine decarboxylase mutant is obtained by mutating a wild-type ornithine decarboxylase with an amino acid sequence shown in SEQ ID NO. 1, and the mutation site of the ornithine decarboxylase mutant is H137R. The ornithine decarboxylase mutant with high enzyme activity is obtained by single-point mutation or multi-site combined mutation of the wild-type ornithine decarboxylase, so that the substrate conversion rate of the ornithine decarboxylation reaction and the synthesis efficiency of putrescine are significantly improved, the rate-limiting bottleneck of the ornithine decarboxylation reaction in the synthesis path from glucose to ornithine and then to putrescine is successfully broken through, and the overall efficiency of the metabolic pathway is significantly optimized.

This invention belongs to the field of bioengineering technology and relates to the application of ferulic acid putrescine in the preparation of deoxynivalenol. This invention verifies that ferulic acid putrescine, when used as an additive in the culture medium of *Fusarium graminearum*, can promote the production of deoxynivalenol by *Fusarium graminearum*. This invention provides more pathways for the synthesis and acquisition of deoxynivalenol.

The present invention relates to a composition for preventing or treating diabetes mellitus using a 4-component mixture of putrescine, glucosamine, nicotinamide, and a STAT3 inhibitor. It has been confirmed that blood glucose is stably regulated when a compound of the 4-component mixture according to the present invention is injected into the caudal vein of a diabetes mellitus-induced mouse. The compound can be practically and usefully used as a therapeutic agent for diabetes mellitus patients and patients exposed to diabetes mellitus risk.

The invention relates to the technical field of raw milk detection, in particular to an intermediate infrared rapid detection method for the freshness of raw milk. According to the method, the putrescine content is used as an evaluation index to detect the freshness of the raw milk, the mid-infrared prediction model of the putrescine content in the raw milk is constructed based on the liquid chromatography-mass spectrometry and the mid-infrared spectrum technology, and the freshness of the raw milk is evaluated based on the putrescine content, so that the model has relatively high accuracy and stability, and is suitable for popularization and application. In model verification, a putrescine predicted value and a putrescine measured value have good linear fitting, and there is no significant difference between the putrescine measured value and the predicted value. The method disclosed by the invention can realize rapid and low-cost detection of the freshness of the raw milk, has a relatively good application prospect, can be widely applied to production of dairy products, and has guiding significance for realizing grading application of the raw milk.