Abstract
The calcium complex of human-like collagen (HLC) was generated in aqueous solution, purified by dialysis or ultrafiltration, and isolated by freeze-drying. Evidence for interactions between HLC and calcium(II) was obtained through measurements of the complex's fluorescence and UV-visible spectra, the interpretation of its Fourier transform infrared spectroscopy and circular dichroism spectra, thermogravimetric (TG) analysis, and differential scanning calorimetry (DSC). The HLC–Ca complex is considered a new chemical compound in which HLC retains its helical structure and the calcium ion is linked to the protein via C=O and N–H groups. Additionally, TG and DSC measurements indicate that the HLC–Ca complex is thermodynamically more stable than free HLC. The results obtained provide important evidence for the further study of the interactions of HLC with Ca(II).





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Acknowledgments
This study was financially supported by the National High Technology Research and Development Program of China (2007AA03Z456), the National Natural Science Foundation of China (20776119, 21076169 and 31000019), the Xi'an Research and Development Program (NC08005 and YF07078), the Scientific Research Program of Shaanxi Provincial Department of Education, China (08JK452, 08JK453, JG08181, 2010JC21, 2010JS107, 2010JS108, 2010JK876 and 2010JS109), the Shaanxi Provincial Scientific Technology Research and Development Program (2007 K06-03, 2010JQ2012, SJ08B03), the Specialized Research Fund for the Doctoral Program of Higher Education of China (20096101120023 and 20096101110014), the NWU Graduate Innovation and Creativity Funds (09YSY26) and the Shaanxi Key Subject Program, China.
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Yu, Y., Fan, D. Characterization of the Complex of Human-like Collagen with Calcium. Biol Trace Elem Res 145, 33–38 (2012). https://doi.org/10.1007/s12011-011-9167-x
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DOI: https://doi.org/10.1007/s12011-011-9167-x


