Abstract: An apparatus for processing an analyte includes a first receptacle having a first aperture, the first aperture having a first configuration; and a second receptacle having a second aperture, the second aperture having a second configuration. The first configuration and the second configuration are complementary, such that the first and second apertures engage each other at a sealing surface, whereby analyte solution within the first receptacle passes into the second receptacle substantially without leaking at the engaged first and second apertures. A method for processing an analyte comprises engaging the first and second receptacles at the sealing surface; putting a first batch of analyte solution into the first receptacle, processing the analyte solution; transferring the processed analyte solution into the second receptacle, and disengaging the second receptacle from the first receptacle.