Abstract
Lysozyme has been successfully immobilized in the mesoporous channels of SBA-15 rods with different sizes. In order to clarify how SBA-15 rods sizes affected the immobilization behavior of lysozyme, small-angle X-ray powder diffraction, Fourier-transformed infrared spectra and nitrogen adsorption/desorption were employed to characterize the SBA-15 rods before and after immobilization. The results clearly showed that lysozyme was immobilized into the channels of SBA-15 rods and the well ordered mesoporous structure of SBA-15 after adsorption of lysozyme was retained. The rate and amount of immobilization were strongly dependent on rods sizes. It was found that the rate and amount of lysozyme immobilization increased with decreasing the sizes of SBA-15 rods. The SBA-15 rods with small size exhibited rapid (<20 min to reach equilibrium) and high-capacity (up to 835 mg g−1) lysozyme immobilization. The effect of SBA-15 rods sizes on lysozyme immobilization rate and amount was discussed in detail. Furthermore, a mechanism for the effect of the rods sizes on the immobilization behavior was suggested.
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