|Title||Marine hydroid perisarc: a chitin- and melanin-reinforced composite with DOPA-iron(III) complexes.|
|Publication Type||Journal Article|
|Year of Publication||2013|
|Authors||Hwang, DSoo, Masic, A, Prajatelistia, E, Iordachescu, M, Waite, JH|
|Date Published||2013 Sep|
|Keywords||Animals, Chitin, Dihydroxyphenylalanine, Horns, Hydrozoa, Iron, Melanins|
Many marine invertebrates utilize biomacromolecules as building blocks to form their load-bearing tissues. These polymeric tissues are appealing for their unusual physical and mechanical properties, including high hardness and stiffness, toughness and low density. Here, a marine hydroid perisarc of Aglaophenia latirostris was investigated to understand how nature designs a stiff, tough and lightweight sheathing structure. Chitin, protein and a melanin-like pigment, were found to represent 10, 17 and 60 wt.% of the perisarc, respectively. Interestingly, similar to the adhesive and coating of marine mussel byssus, a DOPA (3,4-dihydroxyphenylalanine) containing protein and iron were detected in the perisarc. Resonance Raman microprobe analysis of perisarc indicates the presence of catechol-iron(III) complexes in situ, but it remains to be determined whether the DOPA-iron(III) interaction plays a cohesive role in holding the protein, chitin and melanin networks together.
|Alternate Journal||Acta Biomater|