WO1999065469A2 - Processes to generate submicron particles of water-insoluble compounds - Google Patents

Processes to generate submicron particles of water-insoluble compounds Download PDF

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Publication number
WO1999065469A2
WO1999065469A2 PCT/US1999/013755 US9913755W WO9965469A2 WO 1999065469 A2 WO1999065469 A2 WO 1999065469A2 US 9913755 W US9913755 W US 9913755W WO 9965469 A2 WO9965469 A2 WO 9965469A2
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Prior art keywords
water
surface modifier
insoluble
liquefied
process according
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Ceased
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PCT/US1999/013755
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English (en)
French (fr)
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WO1999065469A3 (en
Inventor
Gary W. Pace
G. Michael Vachon
K. Awadhesh Mishra
Inge B. Henriksen
Val Krukonis
Anthony Godinas
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RTP PHARMA Inc
RTP Pharma Corp
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RTP PHARMA Inc
RTP Pharma Corp
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Publication date
Priority to EP99930387A priority Critical patent/EP1089714B1/en
Priority to AT99930387T priority patent/ATE233549T1/de
Priority to AU46938/99A priority patent/AU755993C/en
Priority to CA002335472A priority patent/CA2335472C/en
Priority to DE69905716T priority patent/DE69905716T2/de
Priority to HK02100959.7A priority patent/HK1039566A1/zh
Priority to IL14027699A priority patent/IL140276A0/xx
Application filed by RTP PHARMA Inc, RTP Pharma Corp filed Critical RTP PHARMA Inc
Priority to JP2000554349A priority patent/JP4693238B2/ja
Publication of WO1999065469A2 publication Critical patent/WO1999065469A2/en
Publication of WO1999065469A3 publication Critical patent/WO1999065469A3/en
Priority to IL140276A priority patent/IL140276A/en
Priority to SE0004620A priority patent/SE521255C2/sv
Anticipated expiration legal-status Critical
Priority to AU2003203459A priority patent/AU2003203459A1/en
Ceased legal-status Critical Current

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K9/00—Medicinal preparations characterised by special physical form
    • A61K9/14—Particulate form, e.g. powders, Processes for size reducing of pure drugs or the resulting products, Pure drug nanoparticles
    • A61K9/16—Agglomerates; Granulates; Microbeadlets ; Microspheres; Pellets; Solid products obtained by spray drying, spray freeze drying, spray congealing,(multiple) emulsion solvent evaporation or extraction
    • A61K9/1682—Processes
    • A61K9/1688—Processes resulting in pure drug agglomerate optionally containing up to 5% of excipient
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K9/00—Medicinal preparations characterised by special physical form
    • A61K9/10—Dispersions; Emulsions
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K9/00—Medicinal preparations characterised by special physical form
    • A61K9/14—Particulate form, e.g. powders, Processes for size reducing of pure drugs or the resulting products, Pure drug nanoparticles
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K9/00—Medicinal preparations characterised by special physical form
    • A61K9/14—Particulate form, e.g. powders, Processes for size reducing of pure drugs or the resulting products, Pure drug nanoparticles
    • A61K9/141—Intimate drug-carrier mixtures characterised by the carrier, e.g. ordered mixtures, adsorbates, solid solutions, eutectica, co-dried, co-solubilised, co-kneaded, co-milled, co-ground products, co-precipitates, co-evaporates, co-extrudates, co-melts; Drug nanoparticles with adsorbed surface modifiers
    • A61K9/145—Intimate drug-carrier mixtures characterised by the carrier, e.g. ordered mixtures, adsorbates, solid solutions, eutectica, co-dried, co-solubilised, co-kneaded, co-milled, co-ground products, co-precipitates, co-evaporates, co-extrudates, co-melts; Drug nanoparticles with adsorbed surface modifiers with organic compounds
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K9/00—Medicinal preparations characterised by special physical form
    • A61K9/14—Particulate form, e.g. powders, Processes for size reducing of pure drugs or the resulting products, Pure drug nanoparticles
    • A61K9/141—Intimate drug-carrier mixtures characterised by the carrier, e.g. ordered mixtures, adsorbates, solid solutions, eutectica, co-dried, co-solubilised, co-kneaded, co-milled, co-ground products, co-precipitates, co-evaporates, co-extrudates, co-melts; Drug nanoparticles with adsorbed surface modifiers
    • A61K9/146—Intimate drug-carrier mixtures characterised by the carrier, e.g. ordered mixtures, adsorbates, solid solutions, eutectica, co-dried, co-solubilised, co-kneaded, co-milled, co-ground products, co-precipitates, co-evaporates, co-extrudates, co-melts; Drug nanoparticles with adsorbed surface modifiers with organic macromolecular compounds
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K9/00—Medicinal preparations characterised by special physical form
    • A61K9/14—Particulate form, e.g. powders, Processes for size reducing of pure drugs or the resulting products, Pure drug nanoparticles
    • A61K9/16—Agglomerates; Granulates; Microbeadlets ; Microspheres; Pellets; Solid products obtained by spray drying, spray freeze drying, spray congealing,(multiple) emulsion solvent evaporation or extraction
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K9/00—Medicinal preparations characterised by special physical form
    • A61K9/48—Preparations in capsules, e.g. of gelatin, of chocolate
    • A61K9/50—Microcapsules having a gas, liquid or semi-solid filling; Solid microparticles or pellets surrounded by a distinct coating layer, e.g. coated microspheres, coated drug crystals
    • A61K9/5005—Wall or coating material
    • A61K9/5015—Organic compounds, e.g. fats, sugars
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K9/00—Medicinal preparations characterised by special physical form
    • A61K9/48—Preparations in capsules, e.g. of gelatin, of chocolate
    • A61K9/50—Microcapsules having a gas, liquid or semi-solid filling; Solid microparticles or pellets surrounded by a distinct coating layer, e.g. coated microspheres, coated drug crystals
    • A61K9/51—Nanocapsules; Nanoparticles
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K9/00—Medicinal preparations characterised by special physical form
    • A61K9/48—Preparations in capsules, e.g. of gelatin, of chocolate
    • A61K9/50—Microcapsules having a gas, liquid or semi-solid filling; Solid microparticles or pellets surrounded by a distinct coating layer, e.g. coated microspheres, coated drug crystals
    • A61K9/51—Nanocapsules; Nanoparticles
    • A61K9/5192—Processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/50—Mixing liquids with solids
    • B01F23/51—Methods thereof
    • B01F23/511—Methods thereof characterised by the composition of the liquids or solids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/20—Jet mixers, i.e. mixers using high-speed fluid streams
    • B01F25/28—Jet mixers, i.e. mixers using high-speed fluid streams characterised by the specific design of the jet injector
    • B01F25/281—Jet mixers, i.e. mixers using high-speed fluid streams characterised by the specific design of the jet injector the jet injector being of the explosive rapid expansion of supercritical solutions [RESS] or fluid injection of molecular spray [FIMS] type, i.e. the liquid is jetted in an environment (gas or liquid) by nozzles, in conditions of significant pressure drop, with the possible generation of shock waves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J3/00—Processes of utilising sub-atmospheric or super-atmospheric pressure to effect chemical or physical change of matter; Apparatus therefor
    • B01J3/008—Processes carried out under supercritical conditions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F2101/00—Mixing characterised by the nature of the mixed materials or by the application field
    • B01F2101/22—Mixing of ingredients for pharmaceutical or medical compositions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/04—Specific aggregation state of one or more of the phases to be mixed
    • B01F23/043—Mixing fluids or with fluids in a supercritical state, in supercritical conditions or variable density fluids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/50—Mixing liquids with solids
    • B01F23/56—Mixing liquids with solids by introducing solids in liquids, e.g. dispersing or dissolving
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S977/00—Nanotechnology
    • Y10S977/70—Nanostructure
    • Y10S977/773—Nanoparticle, i.e. structure having three dimensions of 100 nm or less
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S977/00—Nanotechnology
    • Y10S977/70—Nanostructure
    • Y10S977/788—Of specified organic or carbon-based composition
    • Y10S977/797—Lipid particle
    • Y10S977/798—Lipid particle having internalized material
    • Y10S977/799—Containing biological material
    • Y10S977/801—Drug
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S977/00—Nanotechnology
    • Y10S977/902—Specified use of nanostructure
    • Y10S977/904—Specified use of nanostructure for medical, immunological, body treatment, or diagnosis
    • Y10S977/906—Drug delivery

Definitions

  • This invention provides processes for producing micrometer and sub- micrometer sized particulate preparations of biologically useful compounds that are water-insoluble or poorly water-soluble, particularly water-insoluble pharmaceutical agents.
  • a major problem in formulating biologically active compounds is their poor solubility or insolubility in water.
  • drugs listed in the United States Pharmacopoeia are either water-insoluble or poorly water-soluble.
  • Oral formulations of water-insoluble drugs or compounds with biological uses frequently show poor and erratic bioavailability.
  • drug insolubility is one of the most recalcitrant problems facing medicinal chemists and pharmaceutical scientists developing new drugs. Water-insolubility problems delay or completely block the development of many new drugs and other biologically useful compounds, or prevent the much-needed reformulation of certain currently marketed drugs.
  • water-insoluble compounds may be formulated by solubilization in organic solvents or aqueous-surfactant solutions, in many cases such solubilization may not be a preferred method of delivery of the water-insoluble agent for their intended biological use.
  • solubilization may not be a preferred method of delivery of the water-insoluble agent for their intended biological use.
  • many currently available injectable formulations of water-insoluble drugs carry important adverse warnings on their labels that originate from detergents and other agents used for their solubilization.
  • Haynes teaches uses of phospholipid-coated microcrystals in the delivery of water-soluble biomolecules such as polypeptides and proteins.
  • the proteins are rendered insoluble by complexation and the resulting material forms the solid core of the phospholipid-coated particle.
  • the solvent properties of liquefied-gas are strongly affected by their fluid density in the vicinity of the fluid's critical point.
  • a non-volatile solute is dissolved in a liquefied-gas that remains either in the supercritical or sub-critical phase.
  • Nucleation and crystallization are triggered by reducing the solution density through rapid expansion of the liquefied-gas to atmospheric conditions.
  • the liquefied-gas is typically sprayed through 10-50 micron (internal diameter) nozzles with aspect ratios (L/D) of 5-100.
  • L/D aspect ratios
  • High levels of supersaturation result in rapid nucleation rates and limited crystal growth.
  • the combination of a rapidly propagating mechanical perturbation and high supersaturation is a distinguishing feature of rapid expansion from a liquefied-gas solution. These conditions lead to the formation of very small particles with a narrow particle size distribution.
  • Solvent removal from the product is unusually rapid. No carbon dioxide residue is left in the product, and carbon dioxide has a number of other desirable characteristics, for example it is non-toxic, nonflammable, and inexpensive. Furthermore, solvent waste is greatly reduced since a typical ratio of antisolvent to solvent is 30:1.
  • An essential element of this process is the use of phospholipids and other surface modifiers to alter the surface of the drug particles to prevent particle aggregation and thereby improve both their storage stability and pharmacokinetic properties.
  • This process combines or integrates phospholipids or other suitable surface modifiers such as surfactants, as the aqueous solution or dispersion in which the supercritical solution is sprayed.
  • the surfactant is chosen to be active at the compound-water interface, but is not chosen to be active at the carbon dioxide- organic solvent or carbon dioxide-compound interface when carbon dioxide is used as the supercritical solution.
  • the use of surface modifying agents in the aqueous medium allowed making submicron particles by the compressed fluid antisolvent process without particle aggregation or flocculation.
  • Figure 1 is a graph showing the size distribution (relative volume v. particle size in nm) of cyclosporine produced in Example 3, and
  • Figure 2 is a graph showing the size distribution (relative volume v. particle size in nm) of cyclosporine produced in Example 4, and
  • the rapid intimate contact with the surface modifier is achieved by having the surface modifiers dissolved in the liquefied-gas containing the dissolved drug.
  • a rapid intimate contact between the surface modifier and the newly formed particle substantially inhibits the crystal growth of the newly formed particle.
  • the rate at which the liquefied-gas droplet containing the drug is brought into contact with the anti-solvent is much slower if very small stable particles are to be obtained.
  • first surface modifier should be dissolved along with the water insoluble substance to be reduced in size in the liquefied gas in the inventive process
  • second surface modifying agents may also be included in the aqueous medium.
  • the fluid streams may be subjected to additional high shear forces, cavitation or turbulence by a high-pressure homogenizer to facilitate intimate contact of the particle surface and the surface modifier.
  • the overall objective of the present invention is to develop a process with high productivity based on the use of liquefied gas solvents, including supercritical fluid technology, that yields surface modifier stabilized suspensions of water insoluble drugs with an average particle size of 50 nm to about 2000 nm and a narrow size distribution.
  • the process is robust, scalable and applicable to a wide range of water- insoluble compounds with biological uses.
  • the present invention includes procedures for using super critical or compressed fluids to form surface modified particles of up to about 2000 nm in size and usually below 1000 nm, desirably less than 500 nm, preferably less than about 200 nm and often in a range of 5 to 100 nm in size.
  • the size of the particles refers to volume weighted mean diameters of these particles suspended in aqueous medium.
  • the process of the present invention includes forming aqueous microparticulate suspensions of water insoluble or poorly water soluble compounds while simultaneously stabilizing of same with surface modifier molecules by rapid expansion into an aqueous medium from a compressed solution of the compound and surface modifiers in a liquefied-gas (Rapid Expansion of Liquefied Gas Solution, RELGS).
  • another embodiment of the invention includes forming aqueous microparticulate suspensions of water insoluble or poorly water soluble compounds while simultaneously stabilizing the same with surface modifier molecules by rapid expansion into an aqueous medium of a compressed solution of the compound and surface modifiers in a liquefied-gas and homogenizing the aqueous suspension thus formed with a high pressure homogenizer (Rapid Expansion of Liquefied-Gas Solution and Homogenization, RELGS-H).
  • the processes of this invention are believed to induce rapid nucleation of the liquefied-gas dissolved drugs and other biologically active substances in the presence of surface modifying agents resulting in particle formation with a desirable size distribution in a very short time.
  • Phospholipids or other suitable surface modifiers such as surfactants, as may be required, may be integrated into the processes as a solution or dispersion in the liquefied gas.
  • the surface modifier may or may not be incorporated via its solution or dispersion in the aqueous medium.
  • some of the surface modifiers may be dissolved in the liquefied gas along with the water insoluble substance and expanded into a homogenized aqueous dispersion of rest of the surface modifier of the formulation.
  • suitable surface modifying agents in the above noted processes serves to stabilize the generated small particles and suppress any tendency of particle agglomeration or particle growth while they are formed.
  • the water insoluble compounds are those having a poor solubility in water, that is less than 5 mg/mL at a physiological pH of 6.5 to 7.4, although the water solubility may be less than 1 mg/mL and even less than 0.1 mg/mL.
  • water-insoluble drugs examples include immunosuppressive and immunoactive agents, antiviral and antifungal agents, antineoplastic agents, analgesic and anti-inflammatory agents, antibiotics, anti-epileptics, anesthetics, hypnotics, sedatives, antipsychotic agents, neuroleptic agents, antidepressants, anxiolytics, anticonvulsant agents, antagonists, neuron blocking agents, anticholinergic and cholinomimetic agents, antimuscarinic and muscarinic agents, antiadrenergic and antiarrhythmics, antihypertensive agents, antineoplastic agents, hormones, and nutrients.
  • immunosuppressive and immunoactive agents examples include immunosuppressive and immunoactive agents, antiviral and antifungal agents, antineoplastic agents, analgesic and anti-inflammatory agents, antibiotics, anti-epileptics, anesthetics, hypnotics, sedatives, antipsychotic agents, neuroleptic agents, antidepressants,
  • gaseous oxides such as carbon dioxide and nitrous oxide
  • alkanes such as ethane, propane, butane, and pentane
  • alkenes such as ethylene and propylene
  • alcohols such as ethanol and isopropanol
  • ketones such as acetone
  • ethers such as dimethyl or diethyl ether
  • esters such as ethyl acetate
  • Carbon dioxide has a critical temperature of 31.3 degrees C. and a critical pressure of 72.9 atmospheres (1072 psi), low chemical reactivity, physiological safety, and relatively low cost.
  • Another preferred supercritical fluid is propane.
  • Suitable surface modifiers include: (a) natural surfactants such as casein, gelatin, natural phospholipids, tragacanth, waxes, enteric resins, paraffin, acacia, gelatin, and cholesterol, (b) nonionic surfactants such as polyoxyethylene fatty alcohol ethers, sorbitan fatty acid esters, polyoxyethylene fatty acid esters, sorbitan esters, glycerol monostearate, polyethylene glycols, cetyl alcohol, cetostearyl alcohol, stearyl alcohol, poloxamers, polaxamines, methylcellulose, hydroxycellulose, hydroxy propylcellulose, hydroxy propylmethylcellulose, noncrystalline cellulose, and synthetic phospholipids, (c) anionic surfactants such as potassium laurate, triethanolamine stearate, sodium lauryl sulfate, alkyl polyoxyethylene sulfates, sodium alginate, dioctyl sodium sulfosuccinate, negatively charged
  • the phospholipid may be salted or desalted, hydrogenated or partially hydrogenated or natural semisynthetic or synthetic.
  • a detailed description of these surfactants may be found in Remington's Pharmaceutical Sciences, 18th Edition, 1990, Mack Publishing Co., PA; and Theory and Practice of Industrial Pharmacy, Lachman et al., 1986.
  • Fenofibrate Microparticle Formation by the RELGS Process A solution containing Fenofibrate (2g), Lipoid E-80 (0.2g), Tween-80 (0.2g) in the liquefied carbon dioxide pressurized to 3000 psi was expanded through a 50 mm orifice plate into water held at atmospheric pressure and room temperature (22°C). A fine suspension of fenofibrate was obtained with a mean particle size of about 200 nm. The particle sizing was performed by photon correlation spectroscopy using Submicron Particle Sizer-Autodilute Model 370 (NICOMP Particle Sizing Systems, Santa Barbara, CA). This instrument provides number weighted, intensity weighted, and volume weighted particle size distributions as well as multi-modality of the particle size distribution, if present.
  • a fine spray-nozzle was constructed with PEEK capillary tubing of an internal diameter of 63.5 mm.
  • This PEEK nozzle was fastened with a M-100 Minitight male nut and attached to an Upchurch SS20V union body which was further attached to a % inch high pressure manifold via SwagelokTM brand fittings of appropriate size. Except for the PEEK tubing all other components were made up of 316 stainless steel.
  • a liquefied gas solution of the water insoluble substance was introduced at high pressure (>1000 psig) through the % inch high pressure manifold into the 63.5mm PEEK nozzle to be expanded into the aqueous medium.
  • the vessel for the liquefied gas solution was charged with 1 g of cyclosporine and 0.2 g of Tween-80.
  • the vessel was filled with carbon dioxide at 5000 psig and heated to about 24°C.
  • the vessel was allowed to stand for about 20 minutes for complete dissolution and for attaining equilibrium.
  • a 2% w/w suspension of egg phospholipid (Lipoid E80 from Lipoid GmbH) in a 5.5% solution of mannitol was homogenized at 6000 psi with an Avestin Emulsiflex C50 homogenizer (Avestin Inc, Ottawa, Canada) for 15 min when it produced a clear dispersion.
  • the pH of the phospholipid suspension was adjusted to 8.0 with aqueous NaOH solution prior to homogenization.
  • the carbon dioxide solution of cyclosporine and Tween-80 that was held at 24°C and 5000 psig was expanded into the aqueous dispersion of egg phospholipid. Very rapidly, in about 3 minutes, a translucent aqueous suspension of about 23 nanometer particle size was obtained (See Figure 1).
  • This example provides a simple scalable process by the way of incorporation of several such PEEK nozzles within a manifold and simultaneously expanding into a reservoir containing appropriate amount of the aqueous medium.
  • the PEEK nozzle is known to be inert and very inexpensive. Construction of the nozzle is very simple and can be done in less than 10 minutes.
  • Cyclosporine Microparticle Formation by the RELGS-H Process An aqueous suspension containing Mannitol (5.5%), Lipoid E-80 (2%), and Tween 80 (2%), was prepared. A solution of cyclosporine in the Liquifed gas was also prepared and kept at 2000 psig and 60°C. This solution was expanded through a 63.5 mm PEEK nozzle into the aqueous suspension. A suspension of about 3 g cyclosporine was made in this way. The resulting suspension was homogenized for 8 passes at 6,000 psig. The final mean particle size after homogenization was 86 nanometers with the 99 percentile at 150 nm (see Figure 2) as measured using the Submicron Particle Sizer-Autodilute Model 370 (NICOMP Particle Sizing Systems, Santa Barbara, CA).

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  • Physics & Mathematics (AREA)
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  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Medicines That Contain Protein Lipid Enzymes And Other Medicines (AREA)
  • Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)
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PCT/US1999/013755 1998-06-19 1999-06-18 Processes to generate submicron particles of water-insoluble compounds Ceased WO1999065469A2 (en)

Priority Applications (11)

Application Number Priority Date Filing Date Title
HK02100959.7A HK1039566A1 (zh) 1998-06-19 1999-06-18 生产水不溶性化合物的亚微粒子的方法
AT99930387T ATE233549T1 (de) 1998-06-19 1999-06-18 Neues verfahren zur herstellung von partikeln wasserunlöslicher komponenten im grössenbereich bis 2000 nm
AU46938/99A AU755993C (en) 1998-06-19 1999-06-18 Processes to generate submicron particles of water-insoluble compounds
CA002335472A CA2335472C (en) 1998-06-19 1999-06-18 Processes to generate submicron particles of water-insoluble compounds
DE69905716T DE69905716T2 (de) 1998-06-19 1999-06-18 Neues verfahren zur herstellung von partikeln wasserunlöslicher komponenten im grössenbereich bis 2000 nm
IL14027699A IL140276A0 (en) 1998-06-19 1999-06-18 Processes to generate submicron particles of water-insoluble compounds
JP2000554349A JP4693238B2 (ja) 1998-06-19 1999-06-18 水に溶けない化合物のサブミクロン粒子を生成させる方法
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IL140276A IL140276A (en) 1998-06-19 2000-12-13 Processes for the preparation of suspensions of non-soluble compounds with biological activity containing particles up to two microns in size
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CA2335472C (en) 2008-10-28
SE0004620D0 (sv) 2000-12-14
SE521255C2 (sv) 2003-10-14
IL140276A (en) 2007-07-24
JP2002518318A (ja) 2002-06-25
CA2335472A1 (en) 1999-12-23
DE69905716D1 (de) 2003-04-10
CN1160059C (zh) 2004-08-04
JP2011079839A (ja) 2011-04-21
AU2003203459A1 (en) 2003-06-12
AU755993C (en) 2003-10-30
ES2194477T3 (es) 2003-11-16
EP1089714A2 (en) 2001-04-11
ATE233549T1 (de) 2003-03-15
CN1312708A (zh) 2001-09-12
US6177103B1 (en) 2001-01-23
JP4693238B2 (ja) 2011-06-01
IL140276A0 (en) 2002-02-10
SE0004620L (sv) 2001-02-08
WO1999065469A3 (en) 2000-03-02
KR100622047B1 (ko) 2006-09-07
DE69905716T2 (de) 2004-02-05
AU755993B2 (en) 2003-01-02
AU2003203459A8 (en) 2010-04-29
HK1039566A1 (zh) 2002-05-03
KR20010053041A (ko) 2001-06-25
AU4693899A (en) 2000-01-05

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