Figure 5.

OM photos and vitamin B12 cumulative release (%) of CS55 hydrogel beads. The beads are ionically cross-linked by TPP 1%, TPP 5%, and TPP 10%. Scale bar = 200 μm.

Huang et al. Nanoscale Research Letters 2013 8:417   doi:10.1186/1556-276X-8-417
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