Interaction of meso-tetrakis(4-sulphonatophenyl)porphine with chitosan in aqueous solutions
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22340%2F07%3A00018392" target="_blank" >RIV/60461373:22340/07:00018392 - isvavai.cz</a>
Result on the web
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DOI - Digital Object Identifier
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Alternative languages
Result language
angličtina
Original language name
Interaction of meso-tetrakis(4-sulphonatophenyl)porphine with chitosan in aqueous solutions
Original language description
Interaction of meso-tetrakis(4-sulphonatophenyl)porphine (TPPS4) with chitosan (Mr 400 kDa, N-acetyls 20 mol.%) was studied in aqueous solutions. UV-vis absorption and circular dichroism (CD) spectroscopic titration of 10 ?mol l-1 TPPS4 with chitosan demonstrated that an addition of the polysaccharide at appropriate concentrations and pH values induce and support self-aggregation of the macrocycles. The mode of aggregation was strongly dependent on pH: stacking (H-type) aggregates predominated at weak acidic conditions (pH 4.8-6.8) and tilted (J-type) aggregates at pH 2.5. At the intermediate pH value (3.6) both types of TPPS4 aggregates were detected. High amount of chitosan (>0.05 mmol l-1 of GlcN) disrupts H-aggregates forming monomeric porphyrin-chitosan complexes (pH 3.6-6.8), while J-aggregates (pH 2.5) are stable even at very high chitosan concentrations. CD titration experiments confirmed the formation of optically active species of TPPS4 in the presence of chitosan. The comple
Czech name
Interakce meso-tetrakis(4-sulphonatophenyl)porphinu s chitosanem ve vodním
Czech description
Interakce meso-tetrakis(4-sulphonatophenyl)porphinu s chitosanem (Mr 400 kDa, N-acetyls 20 mol.%) byla studovaná ve vodím prostředí. Spektroskopická titrace (UV-vis absorpční a CD) 10 ?mol l-1 TPPS4 s chitosanem prokázala že určité koncentrace roztoku polysacharidu podporují vzniknuti vysoce uspořádaných struktur makrociklu. Typ uspořádaní je závislý na pH roztoku. Tak pH 2.5 podporují uspořádaní podle typu - J, když slabo-kysele prostředí (pH 4.8-6.8) podporují uspořádaní podle typu - H. Oba typy uspořádaní projevovali optickou aktivitu.
Classification
Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
CB - Analytical chemistry, separation
OECD FORD branch
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Result continuities
Project
<a href="/en/project/GA203%2F02%2F0420" target="_blank" >GA203/02/0420: Tetrapyrrole Metallocomplexes for Modification of Triplex DNA Structures</a><br>
Continuities
Z - Vyzkumny zamer (s odkazem do CEZ)
Others
Publication year
2007
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy
ISSN
1386-1425
e-ISSN
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Volume of the periodical
66
Issue of the periodical within the volume
2
Country of publishing house
NL - THE KINGDOM OF THE NETHERLANDS
Number of pages
11
Pages from-to
225-235
UT code for WoS article
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EID of the result in the Scopus database
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