It was showed that both OFLX and CPFX had a strong ability to quench the CAT intrinsic fluorescence through a static quenching procedure.

• 结果表明：药物对过氧化氢酶的内源荧光有较强的猝灭作用，形成复合物所产生的静态猝灭是引起过氧化氢酶荧光猝灭的主要原因。