41 results about "Oxidized Ascorbic Acid" patented technology

Compounds of the formula: are described wherein: A1 is ascorbic acid, dehydroascorbic acid, ascorbyl-2-phosphate, an analog thereof, or a salt thereof; L is a linking group coupled to A1 at the C5 or C6 position thereof; and B1 is an active agent such as an imaging agent or therapeutic agent (e.g. a bisphosphonate), along with pharmaceutically acceptable salts and prodrugs thereof. The compounds are useful for, among other things, improving cartilage uptake of active agents administered for joint diseases such as osteoarthritis and rheumatoid arthritis, and for improving gastrointestinal absorption of bisphosphonates.

Dehydroascorbic acid and polymeric / monomeric derivatives and isomers thereof are useful for artificially coloring the skin and more particularly as a skin self-tanning agent; the dehydroascorbic acid may be formed “in situ” from ascorbic acid or a derivative or salt thereof via chemical oxidation and / or via enzymatic oxidation, and a two-component agent thereof includesa) a first component (B) containing, in a physiologically acceptable medium, at least ascorbic acid or a derivative or salt thereof;b) a second component (C) containing, in a physiologically acceptable medium, at least one chemical oxidizing agent and / or one enzymatic oxidizing agent; components (B) and (C) being stored separately.

A process for manufacturing a black leaf tea that is infusible in hot or cold water. The process involves macerating freshly plucked tea leaves, allowing them to ferment, firing the leaves to arrest fermentation and then drying them to yield black leaf tea, wherein the tea leaves are treated with a solubilising compound selected ascorbic acid, dehydroascorbic acid, 1-scorbamic acid, 5-phenyl-3,4-diketo-gamma-butyrolactone (4-phenyl-2,3-diketo-gamma-butyrolactone) or their salts and mixtures thereof in an amount that is sufficient for the black leaf tea to be soluble in water at 5 to 100° C.

The invention provides a method for synchronously detecting L-ascorbic acid, D-ascorbic acid and dehydroascorbic acid in milk powder. According to the method, deoxidized sodium thiosulfate and metaphosphoric acid mixed solution is used as an extracting liquid, active ascorbic acid can be effectively protected, the stability of the ascorbic acid can be improved, light-resistant operation is not required, experimental operation is simple and convenient, and the extract has stable property in 24 hours at low temperature. The chromatographic condition has small damage to a chromatographic column,and the service life of the chromatographic column can be prolonged; a mobile phase is formed by monopotassium phosphate and decyl amine, the resolution can be improved by the concentration of the mobile phase, two geometric isomers can still be effectively separated when the ascorbic acid has relatively high concentration, mutual interference can be avoided, and the content of active ascorbic acid can be accurately detected. The method has the advantages of simple operation, small chemical reagent dosage and good extract stability, has a relative standard deviation of 7.82 percent, can be used for multi-union detection, and has an important meaning for accurately detecting the true content of active ascorbic acid in milk powder.

The invention discloses a method for simultaneously determining content of reduced ascorbic acid, dehydroascorbic acid and total ascorbic acid in fruit. The method comprises the following steps: adding oxalic acid into a fresh fruit to extract the total ascorbic acid; separating extracting solution into two portions; adding copper sulfate into one portion for oxidization, and determining the content of the total ascorbic acid by means of a 2,4-dinitrophenylhydrazine colorimetric method; adding an antioxidant, thiourea into the other portion, and determining the content of the dehydroascorbic acid by means of the 2,4-dinitrophenylhydrazine colorimetric method; oxidizing the reduced ascorbic acid in a test sample into the dehydroascorbic acid by activated carbon, then adding 2,4-dinitrophenylhydrazine to generate red osazone, and performing colorimetric determination at a position of 500nm; deducting the obtained content of the total ascorbic acid from the obtained content of the dehydroascorbic acid before the oxidization to obtain the content of the reduced ascorbic acid. According to method disclosed by the invention, the contents of three different kinds of ascorbic acids in fruits such as apple and pear are determined, a standard curve is stable, a linear scope is 1-10mu. g / mL, and a correlation coefficient reaches 0.99 or more.

The present invention provides a gypsum composition, a gypsum board and their preparation method and the use of DHA as an anti-sagging additive in a gypsum product. Said gypsum board comprises set gypsum prepared from the composition; while said composition comprises gypsum, and an anti-deformation additive, wherein the anti-deformation additive comprises at least one selected from a group consisting of dehydroascorbic acid, dehydroascorbate and semidehydroascorbic acid. The set gypsum prepared from the said composition shows better anti-sagging or deformation resisting property. The gypsum product of the present invention is hardly distorted and has stronger stability even in the condition of high humidity, thus improve the quality of the gypsum product to meet the demands of the customer.

Cosmetic compositions for artificially coloring the skin contain, formulated into a physiologically acceptable medium,a) at least dehydroascorbic acid and / or a monomeric derivative and / or isomeric form and / or polymeric derivative thereof, andb) at least one preferably monocarbonyl or polycarbonyl self-tanning agent;the dehydroascorbic acid may be formed “in situ” from ascorbic acid or a derivative thereof or a salt thereof via chemical oxidation and / or via enzymatic oxidation.

The invention relates to a pharmaceutical composition for treating African swine fever and application thereof, in particular to a pharmaceutical composition for generating a safe amount of nitric oxide in vivo and application of the pharmaceutical composition. The pharmaceutical composition comprises the following components: an NO toxicity reducing agent, an NO extender and a nitric oxide synthase inducer. The invention provides the pharmaceutical composition which is high in universality and extremely effective in treating pathogenic microorganism infection. The NO toxicity reducing agent is selected from 5-methyltetrahydrofolic acid, NMN and dehydroascorbic acid, the NO extender is selected from arginine, and the nitric oxide synthase inducer is selected from phytohemagglutinin. The present invention provides a new pharmaceutical activity of 5-methyltetrahydrofolate, which has a variety of active effects on the immune system caused by pathogen infection, and can be used for treating or preventing diseases caused by viral infections and other pathogen infections, and in particular, the composition of the present invention is used for preventing or treating African swine fever.

The invention relates to stable liquid compositions containing the oxidized form of vitamin C known as dehydroascorbic acid (DHAA). The compositions comprise DHAA and a pharmacologically acceptable liquid organic polyol solvent. The polyol solvent comprises about 50% or greater of the total weight of the composition. The compositions are useful as dietary supplements, skin-enhancers, concentrates, or research solutions.

Disclosed is an agent which has a destructive effect on malignant tumors and contains alpha-ketoglutaric acid, N-acetyl-seleno-L-methionine, N-acetyl-L-methionine, and a compound that is capable of forming azomethine and is selected among the group 5-hydroxymethylfurfural, dehydroascorbic acid, maltol, and vanillin as an active substance, 5-hydroxymethylfurfural being preferred. The inventive agent can be used in the form of an infusion, in an oral or rectal form of administration, or as an irrigation in cancer therapy.

The invention relates to stable liquid compositions containing the oxidized form of vitamin C known as dehydroascorbic acid (DHAA). The compositions comprise DHAA and a pharmacologically acceptable liquid organic polyol solvent. The polyol solvent comprises about 50% or greater of the total weight of the composition. The compositions are useful as dietary supplements, skin-enhancers, concentrates, or research solutions.

The invention relates to fermented milk with DHA (dehydroascorbic acid) and EPA (eicosapentaenoic acid) and a preparation method thereof; the fermented milk is prepared by fermenting, by bacteria, milk with trehalose, white granulated sugar, a stabilizer, whey protein powder, fish oil or fish oil powder, an antioxidant, an emulsifier and a sweetener; sterilizing; filling with opaque oxygen-tight packaging material. Through burdening, preparation, and packaging study and design for the fermented milk with DHA and EPA, the technical problem that the fermented milk with fish oil or fish oil power products has unstable flavor is solved, product stability in shelf life is guaranteed, and the fermented milk with DHA and EPA is provided, having good flavor.

A gas concentration regulator for culturing anaerobic bacteria, comprising: (a) dehydroascorbic acid; (c) a transition metal catalyst; (d) activated carbon; (e) at least one element selected from the group consisting of alkali metal carbonates, alkali metal hydroxides, and alkaline earth metal hydroxides; and (f) water.

The invention relates to a gas field gas dehydrated ethanediol regenerator corrosion inhibitor, which is applied to the technical field of oil gas field gas extraction equipment corrosion inhibition and belongs to a special composite corrosion inhibitor for inhibiting the corrosion of a gas field gas dehydrated ethanediol regenerator. The gas field gas dehydrated ethanediol regenerator corrosion inhibitor comprises the following ingredients in weight parts: 0.35 to 0.55 part of imidazolone, 0.09 to 0.15 part of dormison, 0.1 to 0.5 part of 1-hydroxy ethylidene-1,1-diphosphonic acid (HEDPA), 16 to 18 parts of triethanolamine, 0.35 to 0.55 part of Mannich base, 0.09 to 0.15 part of dehydroascorbic acid and 0.02 to 0.1 part of ditertbutylhydroquinone. The gas field gas dehydrated ethanediol regenerator corrosion inhibitor has the effect that the serious corrosion problems of serious corrosion in parts of process pipelines, valves, regeneration towers and the like of the existing gas field gas dehydrated ethanediol regenerating system , even perforation and the like are solved.

The invention provides a tracer corrosion and scale inhibitor. The tracer corrosion and scale inhibitor comprises a component A and a component B, wherein the component A comprises the following components in parts by weight: 10 to 15 parts of styrene sulfonate, 10 to 20 parts of dehydroascorbic acid or dehydroisoascorbic acid, 5 to 10 parts of styrene ketone, 5 to 10 parts of tracer scale inhibition dispersion agent, and 15 to 20 parts of low phosphorus corrosion and scale inhibitor; and the component B comprises 10 to 20 parts of zinc sulfate, and 5 to 10 parts of sodium molybdate. The tracer corrosion and scale inhibitor provided in the invention has good scale inhibition effect and can realize the online monitoring and automatic administration.