Carotenoids, tocopherols and thiols as biological singlet molecular oxygen quenchers.

  title={Carotenoids, tocopherols and thiols as biological singlet molecular oxygen quenchers.},
  author={Paolo di Mascio and Thomas P.A. Devasagayam and Stefan. Kaiser and Helmut Sies},
  journal={Biochemical Society transactions},
  volume={18 6},
Singlet molecular oxygen (1O2) has been shown to be generated in biological systems and is capable of damaging proteins, lipids and DNA. The ability of some biological antioxidants to quench 1O2 was studied by using singlet oxygen generated by the thermodissociation of the endoperoxide of 3,3'-(1,4-naphthylidene) dipropionate (NDPO2). The carotenoid lycopene was the most efficient 1O2 quencher (kq + kr = 31 x 10(9) M-1 s-1). Tocopherols and thiols were less effective. The singlet oxygen… CONTINUE READING


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