Isoelectric focusing and electrophoresis at subzero temperatures

Electrophoretic and isoelectric focusing separations have been achieved at -20 to -30°C, i.e., at temperatures considerably lower than previously reported by using as supporting media gels of acrylamide-methylacrylate copolymers and dimenthylsulfoxide-water mixtures. Hybrids of human and sickle cell hemoglobin and partially oxidized human carboxyhemoglobin have been separated in the temperature range -20 to -30°C, both by a discontinuous buffer gel electrophoresis and by isoelectric focusing.