Figure 7.

OM photos and vitamin B12 cumulative release (%) of chemical cross-linking CS55 hydrogel beads. The beads are chemical-cross-linked by GA and GP after TPP 5% ionically cross-linked by TPP. Scale bar = 200 μm.

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