Candida rugosa lipase(CRL)was immobilized on molecular sieve mesoporous silica SBA-15 by adsorption method.The concentration and the amount of immobilized enzyme protein were determined by three detection methods for comparison,including single wavelength UV spectrophotometric method,double-wavelength UV spectrophotometric method and bicinchoninic acid method(BCA).It was found that the UV spectrophotometric method was interfered easily by SBA-15,and the single wavelength UV method gave much higher results t...