Microscale lyophilization and drying methods for the stabilization of molecules

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Microscale lyophilization and drying methods for the stabilization of molecules
Inventor: JOHNSON AUDREY M (US); CIMA MICHAEL J (US)
EC: F26B5/06
IPC: F26B5/06; F26B5/04; (IPC1-7): A61K9/00
Publication info: US2004043042
Date: 2004-03-04
Abstract of US2004043042
Methods and systems are provided for microscale lyophilization or microscale drying of agents of interest, such as pharmaceutical agents or other molecules that are unstable or easily degraded in solution. The drying method includes (a) providing a liquid comprising an agent of interest dissolved or dispersed in a volatile liquid medium; (b) depositing a microquantity (between 1 nL and 10 muL) of the liquid onto a preselected site of a substrate; and then (c) drying the microquantity by volatilizing the volatile liquid medium to produce a dry, solid form of the agent of interest. The lyophilization method includes freezing the microquantity of liquid after step (b) and before step (c). By processing the agent of interest in microquantities in controlled contact with a substrate surface, improved heat and mass transfer is provided, yielding better process control over drying of the agent of interest compared to conventional bulk drying or lyophilization.