自由基捕捉剂又称自由基捕获剂，是能够与活性自由基作用，形成可稳定存在的自由基或稳定分子的物质。
本文用自由基捕捉剂与esr相结合的方法系统研究了各种取代苯胺与二苯酮光化夺氢反应中的活泼自由基。
Active free radicals in the photochemical hydrogen abstraction reaction between benzophenone and aromatic amines have been studied systematically by combination of spin trapping reagents and ESR.
结果发现用NOS自旋捕捉剂可检测到该体系所产生的超氧阴离子自由基。
It was found that the superoxide radicals could be detected by NOS in the above system.
研究结果表明：以PBN为自旋捕捉剂捕集气相自由基用ESR检测的方法和以剑桥滤片捕集固相自由基用ESR检测的方法来分别检测气相自由基和固相自由基的方法是可行的。
PBN was finally selected to trap the gas-phase free radicals and the formed adduct was detected with ESR in the determination of gas-phase free radicals in cigarette smoke.
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