Visible absorption and fluorescence spectroscopy, togheter with circular dichroism were employed to investigate the equilibrating chlorophyll a species formed in solution at different water/acetonitrile content and different pigment concentrations. Changes in chlorophyll a auto-aggregation occurring in water containing acetonitrile in the range 0.1-33% (v/v) were observed and related to the bulk properties of the medium. A 713 nm absorbing species, occurring in solution for water concentrations exceeding 99% was characterized. The influence of the ionic strength of the solution was also subject of the present study, together with the time evolution of the different aggregates.
Chlorophyll a auto-aggregation in water rich region
AGOSTIANO, Angela;PALAZZO, Gerardo;
1993-01-01
Abstract
Visible absorption and fluorescence spectroscopy, togheter with circular dichroism were employed to investigate the equilibrating chlorophyll a species formed in solution at different water/acetonitrile content and different pigment concentrations. Changes in chlorophyll a auto-aggregation occurring in water containing acetonitrile in the range 0.1-33% (v/v) were observed and related to the bulk properties of the medium. A 713 nm absorbing species, occurring in solution for water concentrations exceeding 99% was characterized. The influence of the ionic strength of the solution was also subject of the present study, together with the time evolution of the different aggregates.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
