Table 5: Results of a preliminary screening of different cryoprotectants.

Cryoprotectant Particle size (nm) Zeta potential (mV) PEG4000 1550 ± 296.3 −4.5 ± 0.3 Avicel RC591 956 ± 120.6 −6.9 ± 0.9 Mannitol 1056 ± 213.6 −2.8 ± 0.1 Dextrose 857 ± 87.6 −4.3 ± 0.4 Sorbitol 216 ± 21.2 −10.6 ± 0.7 Aerosil 480 ± 83.2 −15.6 ± 0.3