BP metabolites. DNA adducts, which account for less than 10% of the yields, also form. For BPDE in 0.20 mM ctDNA, k decreases 5.1 times as the Na+ concentration increases from 2.0 to 100 mM. Nevertheless, the DNA adduct level remains constant over the range of Na+ concentrations examined. These results provide evidence that, for BPDE in 0.20 mM DNA and 2.0 mM Na+, ctDNA adduct formation follows a mechanism
苯并[a] py(BP)和
苯并[a]蒽(
BA)代谢产物,(+/-)-trans-7 8-二羟基-抗-9、10-环
氧-7、8、9、10的反应-四
氢-BP(BPDE),(+/-)-trans-3,4-二羟基-反-1,2-环
氧-
1,2,3,4-四氢-BA(
BADE),(+/-)在伪一阶条件下,在变化的Na +(2.0-100 Mm)和
天然浓度下,检查了-
BP-4,5-
氧化物(
BPO)和(+/-)-
BA-5、6-
氧化物(
BAO)小牛胸腺DNA(ctDNA)浓度。在0.2 mM的ctDNA和2.0 mM的Na +中,pH值为7.3时,大多数BPDE,
BADE,
BPO和
BAO(87-95%)都会经历DNA催化的
水解或重排。对于BPDE和
BPO,2.0 mM Na +和0.2 mM ctDNA中的总体伪一级速率常数k比不使用DNA获得的值大21-72倍。对于
BADE和
BAO,速率常数受DNA的影响较小。k值为0。2