NDLI: Spectroscopic study of TPPS<sub>4</sub> nanostructures in the presence of bovine serum albumin

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Photochemical & Photobiological Sciences Vol - 5 Issue - 3

Photochemical & Photobiological Sciences Vol - 5 Issue - 2

Photochemical & Photobiological Sciences Vol -4

Photochemical & Photobiological Sciences Vol -3

Photochemical & Photobiological Sciences Vol -2

Spectroscopic study of TPPS₄ nanostructures in the presence of bovine serum albumin

Content Provider	Royal Society of Chemistry (RSC)
Author	Streckyte, Giedre Valanciunaite, Jurga Rotomskis, Ricardas Bagdonas, Saulius
Copyright Year	2006
Abstract	The influence of bovine serum albumin (BSA) on the formation of J-aggregates of meso-tetra(4-sulfonatophenyl)porphine (TPPS4) in aqueous acid solution (pH 1.3) has been investigated by means of absorption and fluorescence spectroscopy. TPPS4 concentration was kept constant at 2 μM while BSA concentration was varied to get TPPS4 : BSA molar ratios from 1 : 0.005 to 1 : 20. In the presence of protein at all used concentrations the intensity of J-aggregates absorption band was higher than that in the pure solution. Spectral changes indicated that the dynamic equilibrium of the aggregated TPPS4 species was highly dependent on the molar ratio between TPPS4 and BSA. Small relative concentrations of BSA (TPPS4 : BSA, 1 : 0.005–1 : 0.1) had a stimulating effect on formation of J-aggregates. Several fractions of J-aggregates located in protein and aqueous moieties were detected in mixed solutions at intermediate BSA concentrations (TPPS4 : BSA, 1 : 0.5–1 : 8), when the absorbance intensity of the J-aggregates was the highest. At the highest used BSA concentrations (TPPS4 : BSA, 1 : 10–1 : 20) the spectral properties of the remaining J-aggregates were similar to those typical for pure porphyrin solution. Additionally, the split of the Soret band into two with peaks at 440 nm and 423 nm was followed by the simultaneous appearance of Q bands and reflected the formation of TPPS4–BSA complexes including both protonated and deprotonated TPPS4 forms.
Starting Page	381
Ending Page	388
Page Count	8
File Format	HTM / HTML PDF
ISSN	1474905X
Volume Number	5
Issue Number	4
Journal	Photochemical & Photobiological Sciences
DOI	10.1039/b513464a
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Subscribed
Subject Keyword	Fluorescence spectroscopy Absorption spectroscopy BSA Bovine serum albumin Porphyrin Absorption band Soret peak Concentration Protein Dynamic equilibrium
Content Type	Text
Resource Type	Article
Subject	Physical and Theoretical Chemistry

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