5.1.3.3	immobilization to porious silica does not stabilize the enzyme to a sufficient degree that it can be used for long periods of time	
5.1.3.3	photoinactivation in presence of methylene blue or rose bengal. A constant photoinactivation rate is observed in the range pH 5.5-8.0 which increases rapidly at higher values. The competitive inhibitor Hg2+ increases the photosensitivity of the enzyme. The competitive inhibitors, L-fucose and L-xylose protect from photoinactivation