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Statements

Subject Item
n2:RIV%2F60461373%3A22340%2F07%3A00018392%21RIV08-MSM-22340___
rdf:type
skos:Concept n19:Vysledek
dcterms: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 μmol 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 complex nat 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 μmol 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 complex nat 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 μmol 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.
dcterms:title
Interaction of meso-tetrakis(4-sulphonatophenyl)porphine with chitosan in aqueous solutions Interakce meso-tetrakis(4-sulphonatophenyl)porphinu s chitosanem ve vodním Interaction of meso-tetrakis(4-sulphonatophenyl)porphine with chitosan in aqueous solutions
skos:prefLabel
Interakce meso-tetrakis(4-sulphonatophenyl)porphinu s chitosanem ve vodním Interaction of meso-tetrakis(4-sulphonatophenyl)porphine with chitosan in aqueous solutions Interaction of meso-tetrakis(4-sulphonatophenyl)porphine with chitosan in aqueous solutions
skos:notation
RIV/60461373:22340/07:00018392!RIV08-MSM-22340___
n4:strany
225-235
n4:aktivita
n16:Z n16:P
n4:aktivity
P(GA203/02/0420), Z(MSM6046137305), Z(MSM6046137307)
n4:cisloPeriodika
2
n4:dodaniDat
n15:2008
n4:domaciTvurceVysledku
n13:6625657 n13:9893628 n13:2796546 n13:3002675
n4:druhVysledku
n18:J
n4:duvernostUdaju
n17:S
n4:entitaPredkladatele
n14:predkladatel
n4:idSjednocenehoVysledku
427052
n4:idVysledku
RIV/60461373:22340/07:00018392
n4:jazykVysledku
n6:eng
n4:klicovaSlova
TPPS4; Chitosan; Aggregation; UV-vis absorption; Circular dichroism
n4:klicoveSlovo
n9:Chitosan n9:TPPS4 n9:Circular%20dichroism n9:UV-vis%20absorption n9:Aggregation
n4:kodStatuVydavatele
NL - Nizozemsko
n4:kontrolniKodProRIV
[0E886FE03517]
n4:nazevZdroje
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy
n4:obor
n10:CB
n4:pocetDomacichTvurcuVysledku
4
n4:pocetTvurcuVysledku
5
n4:projekt
n7:GA203%2F02%2F0420
n4:rokUplatneniVysledku
n15:2007
n4:svazekPeriodika
66
n4:tvurceVysledku
Volka, Karel Král, Vladimír Synytsya, Andriy Blafková, Petra Synytsya, Alla
n4:zamer
n11:MSM6046137307 n11:MSM6046137305
s:issn
1386-1425
s:numberOfPages
11
n12:organizacniJednotka
22340