Patent ID: 7405083

Claim:
A process for purifying a biological or chemical sample, said process comprising: providing an article having a well with a surface which is at least partially hydrophobic, said well having an open end and a closed end; depositing a liquid sample in said well, said liquid sample being a solution including liquid and first and second classes of solutes; evaporating said liquid from said liquid sample such that said first and second classes of solutes come out from solution from said liquid sample, said first class of solutes in said sample tightly binding to said surface, and said second class of solutes in said sample not tightly binding to said surface; depositing a first buffer in said well, said first buffer disassociating said second class of solutes from said surface; removing said first buffer and said disassociated second class of solutes from said well; depositing a second buffer in said well after removing said first buffer, said second buffer disassociating said first class of solutes from said surface.