NDLI: Trivalent f-elements in human saliva: a comprehensive speciation study by time-resolved laser-induced fluorescence spectroscopy and thermodynamic calculations

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Trivalent f-elements in human saliva: a comprehensive speciation study by time-resolved laser-induced fluorescence spectroscopy and thermodynamic calculations

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Dalton Transactions Vol - 46 Issue - 4

Dalton Transactions Vol - 46 Issue - 3

Dalton Transactions Vol - 46 Issue - 2

Dalton Transactions Vol -39

Dalton Transactions Vol -0

Trivalent f-elements in human saliva: a comprehensive speciation study by time-resolved laser-induced fluorescence spectroscopy and thermodynamic calculations

Content Provider	Royal Society of Chemistry (RSC)
Author	Stumpf, Thorsten Heller, Anne Ikeda-Ohno, Atsushi Wilke, Claudia Barkleit, Astrid
Copyright Year	2017
Abstract	In the case of oral ingestion of radioactive contaminants, the first contact medium is saliva in the mouth. To gain a first insight into the interaction of radioactive contaminants in human saliva, the speciation of curium (Cm(III)) and europium (Eu(III)), i.e., trivalent f-elements, was investigated in different salivary media with time-resolved laser-induced fluorescence spectroscopy (TRLFS). The results indicate that these metal cations are primarily complexed with carbonates and phosphates, forming ternary complexes with a possible stoichiometry of 1 : 1 : 2 (M(III) : carbonate : phosphate). For charge compensation, calcium is also involved in these ternary complexes. In addition to these inorganic components, organic substances, namely α-amylase, show a significant contribution to the speciation of the trivalent f-elements in saliva. This protein is the major enzyme in saliva and catalyzes the hydrolysis of polysaccharides. In this context, the effect of Eu(III) on the activity of α-amylase was investigated to reveal the potential implication of these metal cations for the in vivo functions of saliva. The results indicate that the enzyme activity is strongly inhibited by the presence of Eu(III), which is suppressed by an excess of calcium.
Starting Page	1593
Ending Page	1605
Page Count	13
File Format	HTM / HTML PDF
ISSN	14779226
Volume Number	46
Issue Number	5
Journal	Dalton Transactions
DOI	10.1039/c6dt03726g
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Isotopic labeling Saliva Speciation Curium Europium Laser-induced fluorescence Spectroscopy Stoichiometry Phosphate Calcium Protein Enzyme Catalysis Hydrolysis
Content Type	Text
Resource Type	Article
Subject	Inorganic Chemistry

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