Journal Article

PUBDB-2016-02711

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Detailed Spectroscopic Study of the Role of Br and Sr in Coloured Parts of the Callinectes Sapidus Crab Claw

Katsikini, M. (Corresponding author)Extern*

2016
Elsevier San Diego, Calif.

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Please use a persistent id in citations: doi:10.1016/j.jsb.2016.05.006  doi:10.3204/PUBDB-2016-02711

Abstract: The exoskeleton of crustaceans consists mainly of calcium carbonate (CaCO$_3$) minerals and in many cases exhibits vivid colouration due to the presence of proteins rich in carotenoid chromophores. The exposure of aquatic animals in sea water results often in the incorporation of trace elements in their exoskeleton. The bonding configuration of Br and Sr trace elements in regions with different staining (white, orange and blue) of the exoskeleton of the Callinectes sapidus in crab claw are systematically investigated by a number of complementary spectroscopic techniques, including X-ray absorption fine structure spectroscopy (EXAFS), X-ray fluorescence, Raman and visible light reflectivity spectroscopies. It is found that Sr substitutes for Ca and the Sr/Ca ratio is constant along the claw. In the orange region that includes the claw fingers, CaCO$_3$ adopts a calcite-like structure, whereas in the blue and white regions, located in the palm of the claw, an aragonite-like structure dominates. On the other hand, Br, present only in the blue and orange stained parts of the claw, is bound to phenyl and/or phenol rings of amino acid residues, most probably to phenylalanine and/or tyrosine, of the chromophore protein.

Note: (c) Elsevier Inc.

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Contributing Institute(s):

1. DOOR-User (DOOR)

Research Program(s):

1. 899 - ohne Topic (POF3-899) (POF3-899)
2. CALIPSO - Coordinated Access to Lightsources to Promote Standards and Optimization (312284) (312284)

Experiment(s):

1. DORIS Beamline C (DORIS III)

Appears in the scientific report 2016

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Database coverage:
; ; BIOSIS Previews ; Current Contents - Life Sciences ; IF < 5 ; JCR ; NCBI Molecular Biology Database ; Nationallizenz ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection ; Zoological Record

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