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Title: Photochemistry of anthocyanins and their biological role in plant tissues
Authors: Quina, Frank H.
Moreira, Paulo F.
Vautier-Giongo, Carolina [UNIFESP]
Rettori, Daniel [UNIFESP]
Rodrigues, Rita F.
Freitas, Adilson A.
Silva, Palmira F.
Macanita, Antonio L.
Universidade de São Paulo (USP)
Universidade Federal de São Paulo (UNIFESP)
Univ Bandeirante São Paulo
Univ Tecn Lisboa
Keywords: anthocyanins
charge transfer
proton transfer
Issue Date: 1-Sep-2009
Publisher: Walter de Gruyter Gmbh
Citation: Pure and Applied Chemistry. Berlin: Walter de Gruyter Gmbh, v. 81, n. 9, p. 1687-1694, 2009.
Abstract: Anthocyanins, the major red, purple, and blue pigments of plants, absorb visible as well as UV radiation and are effective antioxidants and scavengers of active oxygen species. in plant leaves, one of the functional roles proposed for anthocyanins is protection of the photosynthetic apparatus from the effects of excess incident visible or UV-B radiation and photooxidative stress. in essence, a photoprotective role requires that the excited singlet states of both complexed and uncomplexed anthocyanins deactivate back to the ground state so quickly that intersystem crossing, photoreaction, and diffusion-controlled quenching processes cannot compete. Studies of the photochemical properties of synthetic analogs of anthocyanins and of several naturally occurring anthocyanins show that this is indeed the case, uncomplexed anthocyanins decaying back to the ground state via fast (subnanosecond) excited-state proton transfer (ESPT) and anthocyanin-copigment complexes by fast (sub-picosecond) charge-transfer-mediated internal conversion.
ISSN: 0033-4545
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Appears in Collections:Em verificação - Geral

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