22.12.2013 Views

Projekt 4. - Institut for Matematik og Datalogi - Syddansk Universitet

Projekt 4. - Institut for Matematik og Datalogi - Syddansk Universitet

Projekt 4. - Institut for Matematik og Datalogi - Syddansk Universitet

SHOW MORE
SHOW LESS

You also want an ePaper? Increase the reach of your titles

YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.

N a t u r v i d e n s k a b e l i g t P r o j e k t / F a r m a c e u t : V a l g f r i t P r o j e k t<br />

<strong>Projekt</strong> 53. Polymorphism in crystalline aspirin: new<br />

tricks with mankind’s oldest drug<br />

Vejleder: Andrew Bond, adb@ifk.sdu.dk<br />

<strong>Institut</strong>: <strong>Institut</strong> <strong>for</strong> Fysik <strong>og</strong> Kemi (IFK)<br />

Praktisk del: <strong>Institut</strong>e<br />

Gruppeplacering: Library<br />

Gruppestørrelse: Minimum 3 and maximum 4 students. One group can work on the project.<br />

Kommentarer: The project is especially targeted at Pharmacy students, but it can be taken by<br />

any student on the Science Year. The project is undertaken in English.<br />

Keywords:<br />

Crystallisation, drugs, X-ray diffraction.<br />

Abstract<br />

Crystalline <strong>for</strong>ms of drugs are of paramount importance in the pharmaceutical industry <strong>for</strong> two<br />

main reasons: (i) the majority of drugs are administered as crystalline solids; (ii) the crystalline<br />

<strong>for</strong>m of a drug can influence pharmaceutically relevant properties such as solubility, bioavailability<br />

and processing ability (<strong>for</strong> example, tablet <strong>for</strong>mation). The term polymorphism refers to the<br />

ability of a particular molecule to adopt more than one crystalline <strong>for</strong>m. This project considers<br />

polymorphism in mankind‟s oldest drug, aspirin.<br />

Since the first determination of the aspirin crystal structure in 1967, there have been many claims<br />

in the literature <strong>for</strong> discovery of new aspirin polymorphs, but none could ever be conclusively<br />

proven. The puzzle was finally solved in 2007 through work per<strong>for</strong>med at SDU. This project<br />

studies aspirin polymorphism, and includes the following activities:<br />

(i) Survey of the literature concerning aspirin polymorphism.<br />

(ii) Synthesis and crystallisation of aspirin polymorphs.<br />

(iii) Characterisation of aspirin polymorphs using X-ray diffraction.<br />

(iv) Visualisation and understanding of the aspirin crystal structures.<br />

The project will provide an overview of crystalline solid <strong>for</strong>ms of pharmaceutical molecules, and<br />

give some experience in techniques <strong>for</strong> crystallisation and characterisation of crystalline solids.<br />

Minikurser<br />

Obligatorisk: <strong>Projekt</strong>arbejde (Microsoft, Nat).<br />

Anbefalede: Ingen.<br />

Litteraturliste over metode artikler, som udleveres til de studerende<br />

A. D. Bond, R. Boese and G. R. Desiraju, American Pharmaceutical Review, May/June 2007.<br />

Selected sections from J. Bernstein, Polymorphism in Molecular Crystals, Ox<strong>for</strong>d University<br />

Press, 2002.<br />

Selected sections from R. Hilfiker (ed.), Polymorphism in the Pharmaceutical Industry, Wiley-<br />

VCH, 2006.<br />

55

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!