Abstract
Two techniques have been developed in an attempt to eliminate the effect of surface tension forces during the drying of biological materials; namely, the critical point method of Anderson, and the freeze dry procedure of Williams. More recently, a procedure employing thermoelectric cooling was developed in this laboratory. This technique has now received further attention and development.Out present thermoelectric cooling unit* consists of four ceramic insulated modules connected in cascade, having 62, 31, 3, and 3 thermocouples, respectively (Fig. 1 ). The base stage is welded to a heat sink consisting of a copper block (2 1/2″ × 2″ × 1″), through which serpentines a 1/4″ wide channel, the thickness of the block, and which is connected by two threaded tubes to the base of the evaporating chamber (Fig. 2).
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