Controlled dissolution crosslinked protein crystals
US6140475A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 11, 1997 |
| Grant date | Oct 31, 2000 |
| Priority date | — |
| Expiry date | Apr 11, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S530/81
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
Protein crystals crosslinked with a multifunctional crosslinking agent are produced that have the ability to change from an insoluble and stable form to a soluble and active form and to release protein activity at a controlled rate when a change in environment surrounding the crystals occurs. The change in environment may be a change in temperature, pH, chemical composition or shear force acting on the crystals, or a change from a concentrate to a dilute form, or a combination of the changes. The crosslinked protein crystals have a half-life activity under storage conditions greater than at least 2 times that of the soluble protein that is crystallized to form the crystals that are crosslinked, and under conditions of use have an activity similar to the soluble protein. Crosslinking is carried out by reacting a slurry of protein crystals with a multifunctional crosslinking agent such as glutaraldehyde, glyoxal, octanedialdehyde or succinaldehyde using a concentration of crosslinking agent and time for crosslinking that provides crosslinked protein crystals having the desired ability to change due to a change in environment. An epoxide multifunctional crosslinking agent may be used …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.