7 results about "O quinones" patented technology

The application prepares an NP co-doped graphite nanosheet electrocatalyst, and has the advantages of simple and efficient preparation method, easy operation, low cost and practical application significance. The application takes cheap graphite powder as raw material, takes melamine and sodium hypophosphite as nitrogen source and phosphorus source respectively, and prepares the NP co-doped graphite nanosheet in a tube furnace through a high-temperature gas phase method. The NP co-doped graphite nanosheet is activated by electrochemistry to generate adjacent quinone structures with basic OER activity and further oxidize P-containing functional groups to obtain more phosphoric acid functional groups with HER activity, and the NP co-doped graphite nanosheet exhibits excellent electrocatalytic performance. The overpotential of the basic OER is only 314 mV, and the overpotential of the acidic HER is only-69.4 mV.

The invention discloses an antibacterial composite coated fabric suitable for a physiological period, a swimsuit and a preparation process, and belongs to the field of textile fabrics, a C = N Schiff base covalent bond is formed through a coating-fiber interface, o-quinone generated by oxidation of tannic acid and cotton hydroxyl / chitosan amino are subjected to a Schiff base reaction to generate irreversible C = N crosslinking, and through hydrolytic condensation of KH-550, the antibacterial composite coated fabric suitable for the physiological period, the swimsuit suitable for the physiological period and the preparation process of the swimsuit suitable for the physiological period are obtained. Silanol and cellulose hydroxyl are dehydrated to form hydrolysis-resistant ether bonds, so that a water molecule insertion path of a coating-fiber interface is blocked, and high hydrophobicity is provided; the prepared antibacterial composite coating fabric has the advantages of super-hydrophobicity, antibiosis, self-repairing and one-way moisture conduction, and is suitable for the fields of female bathing suit cushion layers, medical nursing clothes, protective clothing, washable medical clothing and the like.

The invention discloses an application of a compound gel preparation in preparation of a product for treating chloasma. The compound gel disclosed by the invention is prepared from polypeptide gel capable of opening tight connection of skin through a self-assembly method. Finally, the hydrogel with certain flowability is formed. The polypeptide gel formed by the invention can penetrate through the surface layer of the skin, tranexamic acid, vitamin C and reduced glutathione are transferred to the basal layer of the skin through one-time operation, and then tranexamic acid is competitively combined with tyrosinase to inhibit the activity of the tyrosinase, so that the formation of melanin is reduced; the vitamin C inhibits the formation of melanin by reducing the formation of o-quinone and reducing oxidized melanin; the reduced glutathione is used as an antioxidant component, can inhibit the generation of free radicals, helps to stabilize the skin and restore the skin whiteness, can be used for treating chloasma, and provides a new solution for the field of skin health treatment.

The invention discloses a water-soluble stimuli-responsive o-quinone pyridinium salt prodrug as well as a preparation method and application thereof, and belongs to the technical field of medical chemistry. The prodrug disclosed by the invention can be subjected to structural fracture under the action of stimulating factors, active quinone drugs are selectively released, and non-targeted toxicity is reduced; in combination with a local irradiation mechanism of radiotherapy, the synergistic enhancement effect of the drug effect and radiation is realized, and the tumor killing efficiency is improved; the pyridinium structure improves the hydrophilicity and cellular uptake efficiency of the molecule, and can further access a tumor targeting group.

The invention discloses a method for specifically modifying histidine at the N end of polypeptide or protein, which comprises the following steps: reacting the polypeptide or protein with histidine at the N end with o-quinone to generate a polypeptide or protein product containing oxazine; the polypeptide or protein of which the N end is histidine has a structure as shown in a formula (I), the o-quinone has a structure as shown in a formula (II), and the oxazine-containing polypeptide or protein product has a structure as shown in a formula (III); wherein R is a peptide chain; r1 and R2 groups are respectively and independently hydrogen, substituted or unsubstituted alkyl and substituted or unsubstituted alkoxy. The method provided by the invention has specificity to the polypeptide or protein with the N end being histidine, and the polypeptide or protein with the N end being histidine can be selectively marked in a complex system.

This invention relates to the field of plant tissue culture technology, specifically a method for culturing *Limonium bicolor* tissue, comprising five steps: explant preparation and sterilization, callus induction culture, adventitious shoot proliferation culture, rooting culture, and hardening-off transplanting. Modified polyvinylpyrrolidone (PVP) and modified chitosan form a composite material through borate ester bonds, which accumulates around the explant. MES maintains pH stability, allowing PPVP to continuously diffuse into the wound. Modified chitosan blocks oxygen from direct contact with the wound surface, protecting endogenous phenols; its catechol groups chelate the PPO cofactor Cu. 2+ Activated carbon adsorbs free phenolic substrates in the culture medium, reducing quinone formation at its source. Modified polyvinylpyrrolidone inhibits PPO catalytic activity; grafted ascorbic acid can reduce already formed o-quinones back to catechol, directly removing brown pigment precursors.

The invention provides a method for prolonging the fresh-keeping period of peony and shrub althea flowers, which comprises the following steps: disinfecting stem bases of fresh-cut peony and shrub althea flowers with dimethyl dicarbonate, spraying a film coating liquid for fresh keeping, and putting the stem bases and modified fresh-keeping paper into a low-density polyethylene functional modified atmosphere bag for storage and fresh keeping. According to the invention, silk fibroin, pullulan and the like are adopted to prepare the fresh-keeping liquid, and laccase enables ellagic acid to form o-quinone which is combined with silk fibroin and the like to form a film, so that moisture diffusion and primary bacteriostasis are slowed down; in addition, lignin microspheres are prepared from composite modified lignin loaded with 1-methylcyclopropene microcapsules and limonene, preservative paper base coating liquid is formed, the modified preservative paper is obtained, release of 1-methylcyclopropene and limonene is controlled, and loss of edible quality of the peony hibiscus flowers is inhibited. According to the invention, through the cooperation of coating preservation, preservative paper and modified atmosphere preservation, the storage period of the peony shrub althea flowers is obviously prolonged, good quality characteristics of the peony shrub althea flowers are retained, and the preservation stability and practical value are improved.