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SEM micrographs of PLGA encapsulated iron oxide NPs a) without cryoprotectant (freeze dried in DI water), b) 0.01% dextrose, c) 0.1% dextrose, d) 1% dextrose, e) 2% dextrose, and f) 5% dextrose. Sugar matrix is not visible until 2% dextrose.
