44 results about "Melanin precursors" patented technology

The invention essentially consists in the use of melanins, melanin precursors or melanin derivatives, melanin variants, melanin analogues, natural or synthetic, pure or mixed with organic or inorganic compounds, metals, ions, drugs; as water electrolyzing material, using as sole or main source of energy, natural or synthetic light, coherent or not; in the systems of hydrogen production from water, known as photoelectrochemical systems. These systems integrate as semiconductor material and a water electrolyzer inside a monolithic design, to produce hydrogen directly from water, using light (between 200 to 900 nm) as the main or sole source of energy. At least to basic criteria had to be met: one was that the system or light absorbing compound should generate enough energy to start, lead and complete the photoelectrolysis reaction, being economical, stable and lasting in a water system, requirements met by melanins, representing thus an important and critical advance to solve the central problem of photoelectrochemical designs. The procedure can be applied to generate hydrogen, oxygen and high energy electrons, or the opposite sense, i.e., synthesizing water from the union of hydrogen and oxygen, generating electricity; it can be coupled to other processes, generating a multiplication effect; it can also be used for reduction of carbon dioxide, nitrates and sulphates or others.

A solid-state battery is provided. The battery includes a melanin structure formed of at least one melanin material embedded in an inert material, and first and second metal bands which serve as first and second electrodes, respectively. The melanin material is selected from the group consisting of melanin, melanin precursors, melanin derivatives, melanin analogs and melanin variants. The solid-state battery does not need to be recharged or reloaded.

The invention discloses a method for preparing an all-natural enzyme-fermented black hair dye. The steps are as follows: step 1, prepare tyrosinase liquid by using black soybeans; step 2, prepare tyramine substrate solution; step 3, prepare a biological fermentation system The melanin precursor; step 4, adding auxiliary agent and mordant to the melanin precursor prepared in step 3 to make a hair dye. The invention utilizes pure natural black soybeans and food-grade tyramine as raw materials, adopts a green biological fermentation method, and successfully prepares an all-natural black hair dye with blackening effect. It effectively overcomes the use of chemically synthesized hair dyes containing ammonia, hydrogen peroxide, p-phenylenediamine and its derivatives, which are harmful to the human body; overcomes the problem of difficult extraction of pigments in natural hair dyes, and is suitable for large-scale use in the market Scope promotion.

Electrochemical processes and systems for preserving perishable food are described. The process and system allow for the preservation of perishable food in the presence of water moisture, melanin, or a precursor, derivative, analog, or variant of melanin, and electromagnetic energy, such as visible or invisible light energy. There exists a need in the art for improved methods and processes for preserving perishable foods that overcome certain disadvantages associated with known methods for preserving perishable food, such as addition of preservatives, refrigeration / freezing, drying / dehydration of food, and storage under vacuum. The invention satisfies this need by providing a process and system for preserving perishable food in the presence of water moisture, electromagnetic energy, and melanin, melanin precursors, melanin derivatives, melanin analogs, or melanin variants.

To provide: a melanin which has the excellent property of dyeing a functional film and is excellent in reproducibility and storage stability; a process for producing the melanin; a functional film which contains the melanin, is reduced in melanin fluctuation, and has the excellent ability to protect the eyes from ultraviolet; and a process for producing the film. The process for melanin production comprises: an oxidation reaction step in which a melanin precursor is continuously oxidized with an oxidizing agent in an aqueous alkali solution while the molar ratio of the melanin precursor to the oxidizing agent is kept constant; and a precipitation step in which the liquid reaction mixture after the oxidation step is acidified to precipitate a melanin. The process for producing the melanin-containing functional film comprises: a step in which a film is treated with an aqueous alkali solution containing at least the melanin; and a step in which the film treated with the aqueous alkali solution is treated with an aqueous solution containing an inorganic salt.