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Fig. 2 | Journal of Nanobiotechnology

Fig. 2

From: Development of a chitosan‐modified PLGA nanoparticle vaccine for protection against Escherichia coli K1 caused meningitis in mice

Fig. 2

Freeze-drying did not affect the formation of the VoNPs. a Scanning electron microscopy observation of the VoNPs after the freeze-drying process. b Transmission electron microscopy observation of the VoNPs after the freeze-drying process. c Change of the size distribution of the VoNPs after the freeze-drying process. d Change of the PDI of the VoNPs after the freeze-drying process. e Change of the zeta potential of the VoNPs after the freeze-drying process. n.s. no significant difference; *P < 0.05

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