Microscale lyophilization and drying methods for the stabilization of molecules

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United States Patent Application 20040043042
Kind Code A1
Johnson, Audrey M. ; et al. March 4, 2004
Abstract
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 .mu.L) 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.
Inventors: Johnson, Audrey M.; (Somerville, MA) ; Cima, Michael J.; (Winchester, MA) ; Langer, Robert S.; (Newton, MA)
Correspondence Name and Address: SUTHERLAND ASBILL & BRENNAN LLP
999 PEACHTREE STREET, N.E.
ATLANTA
GA
30309
US

Serial No.: 308579
Series Code: 10
Filed: December 3, 2002
U.S. Current Class: 424/400; 34/286
U.S. Class at Publication: 424/400; 034/286
Intern'l Class: A61K 009/00; F26B 005/06
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