Details

Autor(en) / Beteiligte

• Zvezdanovic, Jelena
• Cvetic, Tijana
• Veljovic-Jovanovic, Sonja
• Markovic, Dejan

Titel

Chlorophyll bleaching by UV-irradiation in vitro and in situ: Absorption and fluorescence studies

Ist Teil von

• Radiation physics and chemistry (Oxford, England : 1993), 2009, Vol.78 (1), p.25-32

Ort / Verlag

Elsevier Ltd

Erscheinungsjahr

2009

Quelle

Access via ScienceDirect (Elsevier)

Beschreibungen/Notizen

• Chlorophyll bleaching by UV-irradiation has been studied by absorbance and fluorescence spectroscopy in extracts containing mixtures of photosynthetic pigments, in acetone and n-hexane solutions, and in aqueous thylakoid suspensions. Chlorophyll undergoes destruction (bleaching) accompanied by fluorescent transient formation obeying first-order kinetics. The bleaching is governed by UV-photon energy input, as well as by different chlorophyll molecular organizations in solvents of different polarities ( in vitro), and in thylakoids ( in situ). UV-C-induced bleaching of chlorophylls in thylakoids is probably caused by different mechanisms compared to UV-A- and UV-B-induced bleaching.