TiO2对牛血清白蛋白的光催化降解的研究

报道了TiO2对牛血清白蛋白（BSA）的光催化降解。利用紫外-可见光谱（UV—Vis）、傅里叶变换红外光谱（FTIR）以及高效液相色谱（HPLC）研究了降解过程并对降解终产物进行了分析。结果显示：在近紫外灯（365nm）照射下，BSA在5h内就可以被TiO2光催化完全降解为小碎片，延长反应时间到40h可使BSA完全矿化（93．5％），其中C，N和S分别被矿化成CO2，NO3^-和SO4^2-而在仅有紫外灯或仅有TiO2存在的条件下，5h内仅有30％左右BSA被降解为小碎片，即使延长反应时间，也无法使BSA矿化成CO2和无机离子。

Investigation of TiO2 Photocatalytic Degradation of Bovine Serum Albumin

The present paper reports photocatalytic degradation of bovine serum albumin (BSA) by TiO2 under near UV (365 nm) irradiation. Ultraviolet-Visible spectrometry, FTIR spectrometry and HPLC were used to study the degradation and characterize the final degradation products. It was found that under near UV irradiation, BSA (0.1 g x L(-1)) can be totally degraded to small fragments by TiQ2 in 5 h. Total mineralization of BSA (93.5%) is reached after reacting for 40 h. C, N and S in BSA are mineralized to give CO2, NO3- and SO4(2-). It is suggested that the degradation of BSA happens in two steps: first to small fragments, then further mineralized to small inorganic molecule. The absence of UV irradiation or TiQ2 can only lead to partial degradation of BSA (30%) in 5 h and no CO2 is observed even in longer reaction time.