## Abstract Twoβdimensional diffusion ordered spectroscopy (DOSY) ^1^H NMR is proposed to analyze drugs that are complex mixtures in order to discriminate genuine from fake formulations. The method was applied to the analysis of 17 formulations of sildenafil, one being genuine Viagra and the others
β¦ LIBER β¦
2D and 3D DOSY methods for studying mixtures of oligomeric dimethylsiloxanes
β Scribed by Stchedroff, Marc J.; Kenwright, Alan M.; Morris, Gareth A.; Nilsson, Mathias; Harris, Robin K.
- Book ID
- 121256214
- Publisher
- Royal Society of Chemistry
- Year
- 2004
- Tongue
- English
- Weight
- 162 KB
- Volume
- 6
- Category
- Article
- ISSN
- 1463-9076
- DOI
- 10.1039/B403960B
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This paper formulates, analyses and discusses 2D and 3D static and dynamic model problems in the orthopaedic practice. Finite element approximations, algorithms and iterative methods for constrained optimization are discussed. Since the conjugate gradient method is one of the most effective methods