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Citation: CHEN Yu-Juan, ZHUO Ke-Lei, KANG Lei, XU Si-Jiao, WANG Jian-Ji. Dielectric Constants for Binary Saccharide-Water Solutions at 278.15-313.15 K[J]. Acta Physico-Chimica Sinica, ;2008, 24(01): 91-96. doi: 10.3866/PKU.WHXB20080116 shu

Dielectric Constants for Binary Saccharide-Water Solutions at 278.15-313.15 K

1.
School of Chemistry and Environmental Science, Henan Normal University, Xinxiang 453007, Henan Province, P. R. China

Received Date: 6 August 2007
Available Online: 20 November 2007

The dielectric constants (D) for aqueous solutions of D-(-)-fructose, D-(+)-glucose, D-(+)-galactose, D-(+)-xylose, and D-(-)-ribose were measured at 278.15, 283.15, 288.15, 293.15, 298.15, 303.15, 308.15, and 313.15 K. Molalities of saccharides are at 0.2, 0.4, 0.6, 0.8, 1.0, and 1.2 mol·kg -1. The results indicated that the logarithmic values of dielectric constants for these saccharide-water solutions decreased with increasing molalities of saccharides and decreased also as the temperature rising. At given molalities, the relationship between dielectric constants and temperatures can be expressed by lgD=A1-B1(T-298.15) for fructose-water, glucose-water, galactose-water, and xylose-water solutions, and by lgD=A2-B2(T-298.15)+C2(T-298.15)2 for ribose-water solution. At given temperatures, dependence of the dielectric constants on the mole fraction (x) can be described by lg(D/D0)=-B3x for all five saccharide-water solutions. At given temperatures and molalities, the dielectric constants are mostly in the order: water>galactose-water>fructose-water>glucose-water≥xylose-water (there is not the order for ribose).
- Dielectric constant; D-(-)-fructose; D-(+)-glucose; D-(+)-galactose; D-(+)-xylose; D-(-)-ribose
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