Treating water insoluble nanoparticles with hydrophilic alpha-hydroxyphosphonic acid conjugates, the so modified nanoparticles and their use as contrast agents
US9205155B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 30, 2009 |
| Grant date | Dec 8, 2015 |
| Priority date | — |
| Expiry date | Oct 11, 2032 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB82Y5/00
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
The present application discloses treating water insoluble nanoparticles, particularly nanoparticles of metals and metal compounds which find utility in diagnostic imaging such as MR and X-ray imaging, with an alpha-hydroxyphosphonic acid conjugate with a hydrophilic moiety to render the nanoparticles sufficiently hydrophilic to find utility in diagnostic imaging. Among the modified hydrophilic nanoparticles disclosed are those in which the hydrophilic moieties of the modifying conjugate are ethylene oxide based polymers and copolymers and zwitterions and the nanoparticles are composed of transition metal oxides such as superparamagnetic iron oxide and tantalum oxide. Disclosed are nanoparticles which are sufficiently hydrophilic to form stable aqueous colloidal suspensions. Also disclosed is diagnostic imaging such as MR and X-ray using the modified hydrophilic nanoparticles as contrast agents.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.