New magnetic nano-absorbent for the determination of n-octanol/water partition coefficients
A novel and generic miniaturization methodology for the determination of partition coefficient values of organic compounds in n-octanol/water by using magnetic nanoparticles is, for the first time, described. We have successfully designed, synthesised and characterised new colloidal stable porous si...
| Autors principals: | , , , |
|---|---|
| Format: | Journal article |
| Idioma: | English |
| Publicat: |
2005
|
| _version_ | 1826305719692951552 |
|---|---|
| author | Gao, X Yu, C Tam, K Tsang, S |
| author_facet | Gao, X Yu, C Tam, K Tsang, S |
| author_sort | Gao, X |
| collection | OXFORD |
| description | A novel and generic miniaturization methodology for the determination of partition coefficient values of organic compounds in n-octanol/water by using magnetic nanoparticles is, for the first time, described. We have successfully designed, synthesised and characterised new colloidal stable porous silica-encapsulated magnetic nanoparticles of controlled dimensions. These nanoparticles absorbing a tiny amount of n-octanol in their porous silica over-layer are homogeneously dispersed into a bulk aqueous phase (pH 7.40) containing an organic compound prior to magnetic separation. The small size of the particles and the efficient mixing allow a rapid establishment of the partition equilibrium of the organic compound between the solid supported n-octanol nano-droplets and the bulk aqueous phase. UV-vis spectrophotometry is then applied as a quantitative method to determine the concentration of the organic compound in the aqueous phase both before and after partitioning (after magnetic separation). log D values of organic compounds of pharmaceutical interest (0.65-3.50), determined by this novel methodology, were found to be in excellent agreement with the values measured by the shake-flask method in two independent laboratories, which are also consistent with the literature data. It was also found that this new technique gives a number of advantages such as providing an accurate measurement of log D value, a much shorter experimental time and a smaller sample size required. With this approach, the formation of a problematic emulsion, commonly encountered in shake-flask experiments, is eliminated. It is envisaged that this method could be applicable to the high throughput log D screening of drug candidates. © 2005 Elsevier B.V. All rights reserved. |
| first_indexed | 2024-03-07T06:37:07Z |
| format | Journal article |
| id | oxford-uuid:f807555a-8b6e-4c12-96db-ce9ffd23bef0 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T06:37:07Z |
| publishDate | 2005 |
| record_format | dspace |
| spelling | oxford-uuid:f807555a-8b6e-4c12-96db-ce9ffd23bef02022-03-27T12:47:14ZNew magnetic nano-absorbent for the determination of n-octanol/water partition coefficientsJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:f807555a-8b6e-4c12-96db-ce9ffd23bef0EnglishSymplectic Elements at Oxford2005Gao, XYu, CTam, KTsang, SA novel and generic miniaturization methodology for the determination of partition coefficient values of organic compounds in n-octanol/water by using magnetic nanoparticles is, for the first time, described. We have successfully designed, synthesised and characterised new colloidal stable porous silica-encapsulated magnetic nanoparticles of controlled dimensions. These nanoparticles absorbing a tiny amount of n-octanol in their porous silica over-layer are homogeneously dispersed into a bulk aqueous phase (pH 7.40) containing an organic compound prior to magnetic separation. The small size of the particles and the efficient mixing allow a rapid establishment of the partition equilibrium of the organic compound between the solid supported n-octanol nano-droplets and the bulk aqueous phase. UV-vis spectrophotometry is then applied as a quantitative method to determine the concentration of the organic compound in the aqueous phase both before and after partitioning (after magnetic separation). log D values of organic compounds of pharmaceutical interest (0.65-3.50), determined by this novel methodology, were found to be in excellent agreement with the values measured by the shake-flask method in two independent laboratories, which are also consistent with the literature data. It was also found that this new technique gives a number of advantages such as providing an accurate measurement of log D value, a much shorter experimental time and a smaller sample size required. With this approach, the formation of a problematic emulsion, commonly encountered in shake-flask experiments, is eliminated. It is envisaged that this method could be applicable to the high throughput log D screening of drug candidates. © 2005 Elsevier B.V. All rights reserved. |
| spellingShingle | Gao, X Yu, C Tam, K Tsang, S New magnetic nano-absorbent for the determination of n-octanol/water partition coefficients |
| title | New magnetic nano-absorbent for the determination of n-octanol/water partition coefficients |
| title_full | New magnetic nano-absorbent for the determination of n-octanol/water partition coefficients |
| title_fullStr | New magnetic nano-absorbent for the determination of n-octanol/water partition coefficients |
| title_full_unstemmed | New magnetic nano-absorbent for the determination of n-octanol/water partition coefficients |
| title_short | New magnetic nano-absorbent for the determination of n-octanol/water partition coefficients |
| title_sort | new magnetic nano absorbent for the determination of n octanol water partition coefficients |
| work_keys_str_mv | AT gaox newmagneticnanoabsorbentforthedeterminationofnoctanolwaterpartitioncoefficients AT yuc newmagneticnanoabsorbentforthedeterminationofnoctanolwaterpartitioncoefficients AT tamk newmagneticnanoabsorbentforthedeterminationofnoctanolwaterpartitioncoefficients AT tsangs newmagneticnanoabsorbentforthedeterminationofnoctanolwaterpartitioncoefficients |