Abstract
Myostracum, which is connected from the umbo to the edge of a scar, is not a single layer composed of prismatic layers, but a hierarchically complex multilayered shape composed of minerals and an organic matrix. Through the analysis of the secondary structure, the results revealed that a β-antiparallel structure was predominant in the mineral phase interface between the myostracum (aragonite) and bottom folia (calcite). After the complete decalcification and deproteinization, the membrane obtained from the interface between the myostracum buried in upper folia, and the bottom folia was identified as chitin. The transitional zone in the interface between the adductor muscle scar and folia are verified. The myostracum disappeared at the edge of the scar of the posterior side. From this study, the entire structure of the myostracum from the adult oyster shell of Crassostrea gigas could be proposed.
Highlights
The mollusk shell has been investigated as a typical biomineralization model for nearly 25 years [1,2,3,4], and it has become especially important due to its potential as a novel synthetic route to high-performance composite materials [5,6,7,8]
The adductor muscle scar is the surface of the myostracal support for the attachment of the adductor muscle, and it is contained in the shell of most bivalves [15]
This study presents a comprehensive characterization of the structure, minerals, and organic matrix of the interface between aragonite and calcite in Crassostrea gigas
Summary
The mollusk shell has been investigated as a typical biomineralization model for nearly 25 years [1,2,3,4], and it has become especially important due to its potential as a novel synthetic route to high-performance composite materials [5,6,7,8]. The exact understanding and a control technique on organic matrices are needed to develop a novel synthetic route [9,10,11]. It is reported that the organic matrix of the aragonitic layer differed from that of the calcitic layer. The study of the interface between the aragonitic layer and calcitic layer could be a good guideline for the novel material synthesis related to organic-inorganic composites
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