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. Author manuscript; available in PMC: 2016 May 19.
Published in final edited form as: ACS Appl Mater Interfaces. 2015 May 27;7(22):12099–12108. doi: 10.1021/acsami.5b02308

Figure 4.

Figure 4

Primary amine sites quantified by ninhydrin assay. Results show the fraction of primary amine quantity in GCX gels (y-axis), when compared to control gels. All gels show decreased fraction in primary amine groups. Higher reduction in primary amine groups suggests increased genipin reactivity at bonding sites along single fibroin chains, rather than reaction between two fibroin molecules.