Abstract
The ability of certain dyes and natural pigments to act as photosensitisers in the oxidation of organic and biological materials has been known for many years. Thus Kautsky (1939) was the first to suggest that dyes could generate what he called “activated oxygen” (now known to be “singlet oxygen” or 1O2), whilst Weiss (1939) showed that radicals could be involved in some dye sensitised photo-oxidation reactions. The literature on the reactions of singlet oxygen generated by dye sensitisers is very extensive (see e.g. texts by Wasserman and Murray (1979) or Ranby and Rabek (1978)). However, use of haematoporphyrin and other dye sensitisers in the phototherapy of cancers has generated much recent activity as is apparent from the papers presented in the present course.
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