Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Crystalline microspheres and the process for manufacturing the same

a technology of crystalline microspheres and microspheres, which is applied in the direction of cellulosic plastic layered products, natural mineral layered products, transportation and packaging, etc., can solve the problems of incompatibility with active substances and loss of active substances, lack of release of active substances or lower extraction yields, etc., and achieves low hygroscopicity

Inactive Publication Date: 2015-05-21
SPI PHARMA
View PDF8 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides improved microspheres that are soluble, perfectly spherical, with no internal voids, and low hygroscopicity and moisture content. The microspheres have a uniform surface with limited roughness, and can be as small as 2 μm. These improvements make the microspheres ideal for use in various applications such as drug delivery and imaging agents.

Problems solved by technology

Reactive beads such as sucrose / starch beads can cause incompatibility with active substances and loss of active substance due to the presence of reducing sugars.
Reaction of moisture in beads made with microcrystalline cellulose, sucrose, starch or cellulose derivatives containing beads can cause incompatibility with active substances and loss of active substance due to the presence of moisture.
Loss of API in insoluble beads such as those made with microcrystalline cellulose, starch or cellulose derivatives can result in lack of release of active substance or lower extraction yields from the insoluble materials due to the of insoluble matrixes.
Also for very small spheres the contour of the starting particle contributes to a lack of having a smooth crevice-free and bump-free surface, thus lacking perfectly shaped solid spheres.
Larger beads place limitations on the tableting process (slower press speed) and formulation (requires more crushing agents) to create an environment that prevents bead fracturing of larger beads.
These materials are not spherical and thus prone to flow issues causing weight uniformity issues, especially at faster tablet press speeds.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Crystalline microspheres and the process for manufacturing the same
  • Crystalline microspheres and the process for manufacturing the same
  • Crystalline microspheres and the process for manufacturing the same

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0102]Mannitol (EP) (Shandong Tianli Pharmaceutical Ltd., Guangzhou, China) and mannitol / sorbitol (2.3%) (sorbitol, Roquette, Keokuk, Iowa) microspheres were produced by prilling (spray chilling) of a melt of the polyols in a stainless steel 2 quart sauce pan. The melted polyol was poured into a heated pressure vessel that was heated by electrical heat bands. The heated pressure vessel was pressurized to 50 psig and the plug valve at the bottom of the vessel was opened to send the mannitol thru the spray line to the nozzle. The spray line was heated by electrical heat tape. The nozzle was heated with a propane torch prior to opening the valve. The prills from the nozzle (Spraying Systems 6501) were collected on plastic and bagged for evaluation. Microspheres particle size distribution was determined by Malvern Mastersizer Laser analysis (Malvern, Pa.). Table 1 shows the particle size distribution of the microspheres. Microsphere diameters were in the 250 μm mean range with a broad d...

example 2

[0103]Mannitol EP (Shandong Tianli Pharmaceutical Ltd., Guangzhou, China), mannitol / sorbitol (2.3%) (sorbitol, Roquette, Keokuk, Iowa) and mannitol / polysorbate 80 (Unichema, New Castle, Del.) microspheres were made by melting polyol and dropping melt to spin disc for formation of microspheres. Mannitol is melted in pan or oven at 10° C. above its melting point for mannitol a temperature higher than 176° C. Once melted, the liquid mannitol is spun into a stream which, by centrifugal force, is spread into a thin film and exits the disk as a ligament that breaks into droplets or exits as droplets. Surface spinner style disk is preferred with a diameter of 4 inches or more and speed capabilities of from 500 RPM to 11,000 RPM. Wheel RPM controls film thickness and thus droplet / bead size. Microspheres are allowed to fall at least 8 feet in room temperature or chilled air to congeal. Once congealed a coarse screen can be used to complete cooling and maintain separation. Any twinning or chi...

example 3

[0137]Erythritol EP (Baolingbao Biology Co., LTD., China) was added to a Tornado Spin Disc (Gold Metal Cincinnati Ohio). The units spin head was heated to ˜160° C. while spinning at 3400 RPM and made microspheres with a PSD of d(0.1)=131 μm, a d(0.5)=262 μm and a d(0.9)=371 μm. The size distribution ratio is 2.8 to 1 for this run. The DSC of these beads shows a single and sharp melt peak at 121.6° C. with a heat of fusion of 273.1 J / g. A pure crystalline erythritol melt range of 199° C. to 121° C. is expected and thus crystal structure of formed microsphere is a standard and highest energy erythritol polymorph.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
aspect ratioaaaaaaaaaa
mean particle sizeaaaaaaaaaa
mean particle sizeaaaaaaaaaa
Login to View More

Abstract

The present invention relates to microspheres and compositions comprising a plurality of microspheres, wherein the microspheres are perfectly spherical and have a moisture content less than 1%, and the method of manufacturing the same. The present invention is useful in the manufacture of sustained and modified release active pharmaceutical ingredient (API) microspheres, as a free flowing excipient for mini-tablets and in the manufacture of API dispersions.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims priority to U.S. Provisional Application No. 61 / 638,073 filed Apr. 25, 2012 and U.S. Provisional Application No. 61 / 783,603 filed Mar. 14, 2013, which are hereby incorporated by reference in their entireties.FIELD OF THE INVENTION[0002]The present invention relates to a composition comprising a plurality of microspheres, wherein the microspheres are perfectly spherical, and the method of manufacturing the same. The present invention is useful in the manufacture of sustained and modified release active pharmaceutical ingredient (API) microspheres, as a free flowing excipient for mini-tablets and in the manufacture of API carrier dispersions.BACKGROUND OF THE INVENTION[0003]Many commercial pharmaceutical beads are either reactive or insoluble. Reactive beads such as sucrose / starch beads can cause incompatibility with active substances and loss of active substance due to the presence of reducing sugars. Reaction of mo...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(United States)
IPC IPC(8): A61K9/16
CPCA61K9/16A61K9/1623Y10T428/2982
Inventor PROPST, CECIL W.MEADOWS, MARC W.TODD, MICHAEL S.
Owner SPI PHARMA
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com