Docetaxel is an antineoplastic agent belonging to the taxoid family and is available on the market in the injection form under the brand name Taxotere^®, containing docetaxel trihydrate as an active pharmaceutical ingredient (API). Docetaxel trihydrate  crystallizes in two different forms, namely in form A and form B. Both forms have been disclosed by L.Zaske & col. [1], [2]. Their structure dates are available in Cambride Structure Database (code CSD: DARGOT & DARGOT01). The crystalografic data and Cambride Structure Datebase data of both docetaxel trihydrate crystal forms were not fulfilled. They include the space group information and unit cell parameters only.

The aims of this work were:

1. Fully identification of docetaxel trihydrate crystal forms by methods use in  the polymorphs studies, such as: Termogravimetric Analysis (TGA), Differential Scanning Calorimetry (DSC), Fourier Transform Infrared Spectroscopy (FT-IR), X-Ray Powder Diffraction (XRPD),
2. The research of new methods of obtaining of docetaxel trihydrate.

The standards of docetaxel trihydrate form A and B  have been obtained and identified. TGA date, DSC date, FT-IR characteristic peaks, and XRPD 2theta angels are shown.

The new preparation method of docetaxel trihydrate, form A, was a subject of our further research. The method is based on crystallization of docetaxel from 2-etoxyethanol and water mixture and is especially useful in docetaxel isolation and purification. As result of the direct docetaxel’s separation from reaction mixture, the product is obtained without decomposition and in course of a simple procedure. The isolated product has a purity of not less than 98%, depending on the starting purity of the employed substrate, and can be further purified by crystallization only.

The presented preparation-method of the docetaxel trihydrate, form A, is subject of Polish Patent application no. P-388498.

References:

[1] L.Zaske, M.-A.Perrin, F.Laveiller J.Phys. IV France 11(2001) Pr10-221;

[2] L.Zaske, M.-A.Perrin, C.Daiguebonne, O.Guillou, Materials Science Forum vols. 443-444 (2004); pp 411-0

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