260
H. Schulz
Fig. 9.1 Raman spectra of pelargonidin- (plg-3-glc), cyanidin- (cyd-3-glc) and delphinidin-3-glucosides (dpd-3-glc) as chloride salts (a), in
acetate buffer solution at ph
5.0 (b), with addition of aluminium (c) and ferric (d) ions in acetate buffer at ph
5.0. Spectra of samples containing buffer were normalised to the CC stretching vibration from acetate at 925 cm
−1
and calibrated on signals at 2,935 cm
−1
and 925 cm
−1
.
then spectrum of acetate buffer has been subtracted. Spectra of chlorides are normalised to the stretching vibration of the phenyl rings at
~ 1,607 cm
−1
. [50]
H. Schulz
Fig. 9.1 Raman spectra of pelargonidin- (plg-3-glc), cyanidin- (cyd-3-glc) and delphinidin-3-glucosides (dpd-3-glc) as chloride salts (a), in
acetate buffer solution at ph
5.0 (b), with addition of aluminium (c) and ferric (d) ions in acetate buffer at ph
5.0. Spectra of samples containing buffer were normalised to the CC stretching vibration from acetate at 925 cm
−1
and calibrated on signals at 2,935 cm
−1
and 925 cm
−1
.
then spectrum of acetate buffer has been subtracted. Spectra of chlorides are normalised to the stretching vibration of the phenyl rings at
~ 1,607 cm
−1
. [50]