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This paper demonstrates for the first time that plant metabolites of the phenylamide type, conjugates of putrescine with hydroxycinnamic acids (p-coumaric, caffeic and ferulic), possess  1 O 2  quenching properties. Data were obtained confirming that their acidic parent compounds were also able to quench  1 O 2 , as did polyamines (putrescine, spermidine and spermine), and that this ability depends on the number of amino groups. Potentiation of the  1 O 2  quenching ability of the conjugates relative to both parent components was established. The importance of polyamines and phenylamides in the plant non-enzymatic antioxidant defence at sites of intensive  1 O 2  generation, such as the photosynthetic centers, was suggested.

Singlet Oxygen Quenching by Phenylamides and their Parent Compounds