Sorptive properties of aluminium ions containing mesoporous silica towards l-histidine

The applicability of aluminium-containing mesoporous materials as carriers for l-histidine has been evaluated for the first time. The modified mesoporous silica such as SBA-15 and SBA-16 were synthesised by hydrothermal method and characterised by low-temperature nitrogen sorption, transmission and scanning microscopy, X-ray and laser diffraction methods. The results of these studies confirmed the ordered mesoporous structures of all materials obtained. The modification of mesoporous materials with aluminium ions changed the textural parameters and particle size distribution relative to those in the pristine material. Aluminium-modified SBA-15 exhibited higher release rate of amino acid than the pure material. The opposite phenomenon was observed when l-His was released from pristine and modified SBA-16 materials. The kinetics of amino acid release from all mesoporous materials followed the Korsmeyer–Peppas model. The results proved that the structural parameters of mesoporous materials and the percentage content of aluminium strongly influenced the release rate of l-His.