1,721,089 research outputs found
Electrochemical characterization of species involved in photosynthesis: from proteins to model systems
No full textIn this paper, the results obtained in the last decade by using several electrochemical techniques to characterize species and processes involved in photosynthesis are reviewed, relating them to the work done in this field in our laboratory. The data are discussed in order of increasing level of complexity of the systems to which they are referred, going from chlorophyll aggregates to photosynthetic protein of bacteria and green plants. Possible applications of the photosynthetic systems in the field of the solar energy conversion are also described
“Formation of Chl a photoreactive dimers in alcoholic mixtures: spectroscopic and electrochemical study”
No full text
THE EFFECT OF INCREASING NACL CONCENTRATION ON THE STABILITY OF INCLUSION COMPLEXES IN AQUEOUS SOLUTION
No full textElectrochemical characterization of the fluorescent 2-(bis-(β-hydroxyethyl)-amino)-1.4-benzoquinone
No full textSpectroscopic and electrochemical study of Rose Bengal in aqueous solutions of cyclodextrins
No full textThe interaction of Rose Bengal (RB) in aqueous solution of LiClO4 0.1 M with a-cyclodextrin (a-CD), hydroxypropyl-h-cyclodextrins
(HP-h-CD) and hydroxypropyl-g-cyclodextrins (HP-g-CD) were studied by spectrophotometric measurements. The presence of Induced
Circular Signals and the results of the analysis of the modifications in the absorbance spectra of RB produced by the presence of CDs in
solution indicate that RB forms inclusion complexes only with HP-h-CD and with HP-g-CD
Study on the aggregation and electrochemical properties of Rose Bengal in aqueous solution of cyclodextrins
No full textThe interactions of Rose Bengal (RB) with α-cyclodextrin (α-CD), hydroxypropyl-β-cyclodextrin (HP-β-CD), hydroxypropyl-γ-cyclodextrin
(HP-γ-CD), heptakis(2,3,6-tri-O-methyll)-β-cyclodextrin (TM-β-CD) were studied in aqueous solutions of 0.1 M KClO4 and 0.1 M LiClO4 by
vis absorption, fluorescence spectroscopy as well as electrochemical measurements at 298 K. The spectrophometric results indicate that RB is
included in all β- and γ-CDs forming complexes with a stoichiometry 1:1 whose stability is slightly higher in KClO4 than in LiClO4 solutions.
The complex stability constants determined for salt-containing CD solutions are lower than those for water solutions. The complexation of RB
with β- and γ-CD and the differences between the complexes obtained in the presence of the two salts were confirmed by an electrochemical
study
Detailed Investigation of ROS arisen from Chlorophyll a/Chitosan based-biofilm
No full textThe aim of this work is to study the nature of reactive oxygen species, ROS, arisen from Chitosan/2-HP--Cyclodextrin/Chlorophyll a (CH/CD/Chla) blended biofilm under a photodynamic activity. Suitablemolecules, called primary acceptors, able to react selectively with ROS, in turn generated by the pho-tosensitizer (PS), herein Chla, are used to attempt this purpose. The changes of the absorption and theemission spectra of these acceptors after the irradiation of aqueous solution containing the active biofilmhave provided the specific nature of ROS and thus the main pathway of reaction followed by PS, in ourcondition. The1O2formation was unveiled using Uric Acid (UA) and 9,10-diphenilanthracene (DPA). Onthe other hand, 2,7- dichlorofluorescin and Ferricytochrome c (Cyt-c) were used to detect the formationof hydrogen peroxide and superoxide radical anion, respectively. Results suggest that among the possiblepathways of reaction, namely Type I and Type II, potentially followed by PSs, in our condition the hybridbiofilm CH/CD/Chla follows mainly Type II mechanism with the formation of1O2. However, the latter isinvolved in subsequent pathway of reaction involving Chla inducing, in addition, the formation of O2•−and H2O2
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