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    Protein Adsorption on Hydroxyapatite Nano-crystals with Quartz Crystal Microbalance Technique

    Year: 2008

    Journal: Key Engineering Materials Vols. 361-363 (2008) pp 1119-1122, 20100827

    Authors: Yoshioka T. *, Ikoma T., Monkawa A., Tonegawa T., Chakarov D., Kasemo B., Hanagata N., Tanaka J.

    Last authors: J. Tanaka

    Organizations: *Department of Metallurgy and Ceramics Science, Tokyo Institute of Technology, 2-12-1, Ookayama, Meguro-ku, Tokyo 152-8550, Japan, tyoshioka@ceram.titech.ac.jp

    Country: Japan

    Real time adsorption behaviors of six proteins with different isoelectric points on hydroxyapatite (HAp) nanocrystal surfaces have been investigated by using HAp sensors for quartz crystal microbalance with dissipation technique (QCM-D). The dissipation (D)–frequency (f) plots clearly showed that the different types of protein adsorption behaviors; the D-f plots of acidic proteins lie on one straight line with a constant slope under all initial protein concentrations, while those of neutral and basic proteins lie on two straight lines with different slopes. The acidic proteins formed a monolayer, while the neutral and basic proteins could cause conformational changes with the adsorbed amount of proteins. The QCM-D technique with novel HAp nanocrystal sensor is useful for the liquid phase changes of proteins on the surface.