摘要:
The invention relates to a method for the production of active ingredient-containing pellets by the steps of a) suspending or dissolving a pharmaceutical active ingredient in a dispersion, which contains a cationic copolymer, b) dropping said dispersion, containing the pharmaceutical active ingredient and the copolymer in an aqueous polymer solution, which contains an anionic copolymer, incompatible with the cationic copolymer, so that active ingredient-containing pellets precipitate and c) separating said active ingredient-containing pellets from the aqueous polymer solution and then drying said pellets. The invention also relates to said pellets and the use thereof in diagnostics or cosmetics, as well as pharmaceutical forms which contain said pellets.
摘要:
Medical devices and methods are provided for the pulmonary delivery of a drug in heliox gas. One method comprises (a) providing a medical device which comprises an aerosolization means, a conduit means, a gas mask, and a source of heliox gas, the medical device being operable as a closed system to prevent entrainment of ambient air into an inhaled aerosol; (b) providing a drug in a liquid or dry powder form; (c) using the aerosolization means to form an aerosol of particles or droplets dispersed in heliox gas, said particles or droplets comprising the drug and said heliox gas being from said source; and (d) flowing the aerosol through the conduit means and into the gas mask secured over a patient's mouth and nose in a manner for the patient to inhale the aerosol without dilution of the aerosol with ambient air.
摘要:
The invention concerns a method for making very fine particles containing at least an active principle inserted in a host molecule and a device for implementing said method. The method is characterized in that it consists in forming a solution of the active principle in a first liquid solvent and of a product formed by the host molecules in a second liquid solvent, then in contacting the resulting solutions with a supercritical pressure fluid, so as to precipitate the host molecules which are dissolved therein.
摘要:
The invention relates to a method and a device for the production of spherical particles, whereby a molten prepolymer or precondensate is transformed into droplets by means of a drip nozzle, the droplets are subjected to a countercurrent with a gas in a precipitation column until at least partial crystallization is achieved and are then subjected to an additional post-crystallization phase. In order to economically produce higher quality particles at a high flow rate, the molten prepolymer is transformed into droplets by means of a vibrating nozzle plate and/or direct vibration of the molten prepolymer or polymer and resulting droplets are subjected to an air and gas countercurrent.
摘要:
The invention relates to free nano-sized particles of active agents e.g. therapeutic, cosmetic or diagnostic agents, and to a method for the preparation of such particles. The method comprises providing a liquid feed stock comprising an active agent or combination of two or more active agents, atomising the liquid feed stock, suspending the droplets in a carrier gas, and passing the carrier gas and droplets through a heated tube flow reactor under predetermined residence time and temperature history, and collecting the particles produced. Nano-sized crystalline spherical uncharged particles with narrow aerodynamic particle size distribution and rough surfaces, are obtained. The particles show improved dissolution rate in-vitro and bioavailability in-vivo, dispersibility and stability.
摘要:
A method for producing semiconductor or metal particles comprises the steps of: storing a semiconductor or metal melt in a crucible having a nozzle; supplying a gas comprising at least one selected from the group consisting of He, Ne, Ar, Kr and Xe into the crucible such that the pressure of the supplied gas in a space over the melt in the crucible is higher than the pressure of a gaseous phase into which the melt is dropped; dropping the melt from the nozzle into the gaseous phase by the pressure of the gas to form liquid particles; and solidifying the liquid particles in the gaseous phase to obtain semiconductor or metal particles. The crucible comprises at least one selected from the group consisting of hexagonal BN, cubic BN, Si3N4, TiB2, ZrB2, zirconia and stabilized zirconia at least near the nozzle. Alternatively, the crucible comprises quartz glass at least near the nozzle and has a heat-resistant support member for suppressing deformation caused by a decrease in viscosity of the quartz glass at high temperatures.
摘要:
Described are preferred processes for producing extrusion-granulated supernucleophilic 4-amino-substituted pyridine catalysts, and granular products obtainable thereform. Also described are preferred activation-substitution-deactivation processes for producing 4-aminopyridine compounds, which involve the use of acrylic acid or acrylamide or analogs thereof for activation, and substitution steps conducted under mild basic conditions in an excess of the amine reagent for 4-substitution. Such processes provide improved reacted masses which are more readily processed to recover the products in pure, heat-stable form. Further, described are processes for preparing 4-substituted-pyridines via pyridine betaines.
摘要:
A process for forming solid particles comprising the steps of: combining in molten form a major component of a crystallizable condensation homopolymer and a minor component of a non-crystallizable condensation polymer, wherein the crystallizable condensation homopolymer and the non-crystallizable condensation polymer each have a degree of polymerization of 10 to less than 48 prior to the combining; mixing the combined crystallizable condensation homopolymer and non-crystallizable condensation polymer in molten form to form a mixture that comprises 10 to 30 mol % of the non-crystallizable condensation polymer; forming the mixture into droplets; exposing the droplets to a thermal environment which results in the bulk of the droplet reaching within 15 seconds a temperature within null10null C. of the temperature at which the maximum rate of crystallization of the crystallizable condensation homopolymer occurs; and crystallizing at least a portion of the crystallizable condensation homopolymer in the mixture to form solid particles.
摘要:
According to the invention, a synthetic resin composition having a desirable a low coefficient of friction when submersed in a liquid is provided. In addition, a method of making a low friction bearing for use under liquid is provided as well as a low friction bearing or use underwater. According to the invention, a synthetic resin composition with lubricative underwater properties is provided. A powder preferably a fine powder of a RBC, CRBC or both are uniformly dispersed in a synthetic resin. Desirably the weight ratio between RBC or CRBC powders and the synthetic resin is 30:90 to 70:10.
摘要:
The invention provides a composition comprising microparticles of a water-insoluble or poorly soluble compound, at least one phospholipid, and at least one surfactant, produced by applying an energy to a mixture comprising particles of the compound, the at least one phospholipid, and the at least one surfactant so as to obtain the microparticles. The invention also provides a process for preparing microparticles of a water-insoluble or poorly soluble compound. The process includes mixing particles of a water-insoluble or poorly soluble compound with at least one phospholipid and at least surfactant to form a mixture and applying energy to the mixture sufficient to produce microparticles of the compound. The methods of the invention allow for the production of microparticles smaller than particles produced through previously known methods and the microparticles exhibit advantageous properties including remarkable resistance to particle size growth during storage.