3,4-Dihydroxybenzaldehyde (protocatechuic aldehyde), (E)-3-(3,4-dihydroxyphenyl)prop-2-enoic acid (caffeic acid), (2S,3R,4S,5R,6R)-6-(hydroxymethyl)oxane-2,3,4,5-tetrol (d-galactose), and (3R,4S,5R,6R)-2-[[(2R,3S,4S,5R)-6-[(2S,3S,4S,5R)-3,4-dihydroxy-2,5-bis(hydroxymethyl)oxolan-2-yl]oxy-3,4,5-trihydroxyoxan-2-yl]methoxy]-6-(hydroxymethyl)oxane-3,4,5-triol (d-raffinose) are substances contained in danshen. In this study, the solubilities of protocatechuic aldehyde, caffeic acid, d-galactose, and d-raffinose pentahydrate in the mixtures of ethanol and water from 273.2 K to 303.2 K were determined. The solubilities of protocatechuic aldehyde and caffeic acid in ethanol water solutions are significantly higher than those in pure water. The solubilities of d-galactose and d-raffinose pentahydrate decrease as ethanol mass fraction increases. The solubilities of the four compounds increase as equilibrium temperature increases. Prediction values of d-galactose calculated using universal functional activity coefficient (UNIFAC) models agreed well with experimental data.
Compounds
#
Formula
Name
1
C6H12O6
(+)-galactose
2
C2H6O
ethanol
3
H2O
water
4
C18H42O21
D-raffinose, pentahydrate
5
C7H6O3
3,4-dihydroxybenzaldehyde
6
C9H8O4
caffeic acid
Datasets
The table above is generated from the ThermoML associated json file (link above).
POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied;
the numbers refer to the table of compounds on the left.