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Abstract: A rehydration process for freeze-dried human platelets was studied on 1 ml of samples. The effects of prehydration duration, prehydration temperature, and rehydration solution on the recovery rate, mean platelet volume (MPV), and platelet distribution width (PDW) were investigated. The mass changes during the prehydration process were also studied. Three prehydration durations: 0, 1.5, and 3.5 h, and two rehydration solutions: platelet-poor plasma and phosphate-buffered saline (PBS), were tested. It was found that: (1) the prehydration was of significance; (2) 1.5 h of prehydration had better effects than 3.5 h of prehydration; (3) as a rehydration solution, the platelet-poor plasma behaved better than the PBS. The impacts of prehydration duration and temperature on the results were studied. There was almost no difference between 35 and 37 °C. Among all the prehydration durations tested, 15, 30, 60, 90, and 120 min, the best result was achieved with the time duration of 15 min. The weights of prehydrated platelets at the end of each test were measured and the water contents were calculated. After 15 min of prehydration, the water contents in the samples were about (4.8±0.01)% and (5.27±0.29)% (w/w) corresponding to the conditions of 35 and 37 °C, respectively. These results will be helpful for further studies on the freeze-drying of mammalian cells.

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