TY - JOUR
T1 - Fluorescence spectra and decays of malvidin 3,5-diglucoside in aqueous solutions
AU - Figueiredo, Paulo
AU - Pina, Fernando
AU - Vilas-Boas, Luis
AU - Macanita, António L.
PY - 1990/1/1
Y1 - 1990/1/1
N2 -
The fluorescence properties of malvidin 3,5-diglucoside in aqueous solutions at various pH values were investigated using steady state and time-resolved fluorescence techniques. Fluorescence emission bands were assigned to the flavylium cation (AH
+
) (λ
max
= 620 nm), hemiacetal (B) (λ
max
= 370 nm), chalcone (C) (λ
max
= 435 nm), ionized chalcone (C
-
) (λ
max
= 495 nm), quinonoidal base (A) (λ
max
= 660 nm) and ionized quinonoidal base (A
-
) (λ
max
= 665 nm) forms. The fluorescence decays of these forms are, in general, multiexponential. In some cases, this is due to the overlap of more than one emission band, and in others indicates an excited state interconversion between some of these forms.
AB -
The fluorescence properties of malvidin 3,5-diglucoside in aqueous solutions at various pH values were investigated using steady state and time-resolved fluorescence techniques. Fluorescence emission bands were assigned to the flavylium cation (AH
+
) (λ
max
= 620 nm), hemiacetal (B) (λ
max
= 370 nm), chalcone (C) (λ
max
= 435 nm), ionized chalcone (C
-
) (λ
max
= 495 nm), quinonoidal base (A) (λ
max
= 660 nm) and ionized quinonoidal base (A
-
) (λ
max
= 665 nm) forms. The fluorescence decays of these forms are, in general, multiexponential. In some cases, this is due to the overlap of more than one emission band, and in others indicates an excited state interconversion between some of these forms.
UR - http://www.scopus.com/inward/record.url?scp=0001229714&partnerID=8YFLogxK
U2 - 10.1016/1010-6030(90)85019-S
DO - 10.1016/1010-6030(90)85019-S
M3 - Article
AN - SCOPUS:0001229714
SN - 1010-6030
VL - 52
SP - 411
EP - 424
JO - Journal of Photochemistry and Photobiology A: Chemistry
JF - Journal of Photochemistry and Photobiology A: Chemistry
IS - 3
ER -