| 摘要 |
A polyalkylene glycol (PAG)-preferably a polyethylene glycol-or a derivative or conjugate thereof, in particulate form, having a residual solvent content of 200 ppm or less and a volume mean particle diameter of 25 mum or less. Also methods for forming particulate products containing PAGs or derivatives or conjugates thereof, in particular by carrying out a GAS process-preferably a Nektar(TM) SCF process-on a solution or suspension of a target substance but using as the anti-solvent fluid a compressed fluid which at the point of its contact with the solution or suspension is at a temperature of 25° C. or below.
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