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s it avoids frequent, repeated intakes of medicines. Another positive point is that this method reduces side effects; by circumventing the digestive tract, the active substance passes directly into the bloodstream. Thus it is also possible to reduce the quantity of drug administered, as there is no longer any need to allow for its partial destruction as it passes through the digestive tract.

In view of these advantages, why can the technique not be extended to a broader range of active substances? Because, until now, we only knew how to make these biodegradable polymers using two monomers (the basic components of polymers), lactide and glycolide. It is rather like making a bead necklace when only green and red beads are available. And in the same way that such a two-colored necklace would not match all outfits, so the polyesters obtained cannot be combined with just any active substance. Without accounting for the fact that when using these little reactive lactide and glycolide monomers, industrial preparation of the polymers requires lengthy reaction times at high temperatures (e.g. several hours at 140°C-160°C).

This is where Didier Bourissou's team same up with the idea of changing the recipe and ingredients in order to facilitate access to these polyesters and increase their diversity. Many tests later, they achieved their goal. In collaboration with Isochem, they have developed a new synthetic process for these polymers. This involves new elementary building blocks, the O-carboxy anhydrides, which are much more reactive (i.e. more beads for our necklace), so that the polyesters can be prepared under much less harsh laboratory conditions (e.g. a few minutes at 25°C).

And above all, a much wider variety of polymers is available, thus multiplying the chances that an active substance will find its appropriate biodegradable excipient. These promising results have given rise to the filing of two patents.

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