Vitamin C(ascorbic acid) was oxidated to DHAA by Cu~(2+),then DHAA reacted with benzoic acid in buffer solution to form a fluorescent product,and the solution of cetyltrimethyl benzyl ammonium bromide can enhance the sensitivity of the method.

• 维生素C经Cu2+氧化为脱氢抗坏血酸,与苯甲酸及十六烷基三甲基溴化铵产生荧光协同增敏作用。