Apparent molar volumes of aqueous cellobiose solutions

Abstract

Apparent molar volume data for solutions of cellobiose and water are reported for 25, 35, 45, 55 and 65 O C . Osmotic coefficients were determined at 0 and 25 O C . Theories of dilute solutions are applied to solute-solvent and solute-solute interactions, assuming a rigid particle model for the repulsive potential.Sucrose and cellobiose are disaccharides of the same molecular formula but differing ring structures. Cellobiose is 4-0-( P-D-glucopyranosy1)-D-glucopyranose and sucrose is a-D-glucopyranosyl-P-D-fructofuranoside. They apparently have the same number of hydroxyl groups available for bonding in aqueous solution but differ considerably with respect to their solubilities in aqueous solution. Sucrose is ca. 5 times as soluble as cellobiose at 25 OC and dissolves much more quickly. Values for the solute-solvent and solute-solute interactions can be calculated from thermodynamic properties on the basis of rigorous statistical mechanical theories1* Information on the solute-solvent interaction is obtained from the partial molar volume of the solute at infinite dilution; data for the osmotic coefficient of the solvent then give values for the solute-solute interaction. It was decided to obtain these data for cellobiose and compare them with existing data for sucrose to try and throw some light on the problem.

Apparent molar volumes and apparent molar heat capacities of aqueous D(+)-cellobiose, D(+)-maltose, and sucrose at temperatures from (278.15 to 393.15)K and at the pressure 0.35MPa

“…Values of the regression coefficients m i for equation (5) are given in table 4. The regression surfaces (V / , m, T) for equation (5), our V N values from tables 1 to 3 and literature values of V / for the three aqueous disaccharides are shown in figures 1 to 3 [6][7][8][9][10][11][12][13][14][15][16][17]. Our regression surfaces differ from the literature values as follows: for cellobiose, average D = À0.76 cm 3 AE mol À1 , maximum D = 0.43 cm 3 AE mol À1 [14], minimum D = À1.10 cm 3 AE mol À1 [11]; for maltose, average D = À1.49 cm 3 AE mol À1 , maximum D = 0.35 cm 3 AE mol À1 [17], minimum D = À2.36 cm 3 AE mol À1 [14]; and for sucrose, average D = 0.08 cm 3 AE mol À1 , maximum D = 1.40 cm 3 AE mol À1 [15], minimum D = À1.14 cm 3 AE mol À1 [8].…”

“…Solutions were made from D D(+)-cellobiose (C 12 11 , M 2 = 342.30 mol AE kg À1 , Spectrum Chemical, CA, USA, Product # S1695, >99% assay) as received from the manufacturers. Purities of these three disaccharides were confirmed as 0.998, 0.997, and 0.995 mass fraction, 0021 respectively, by C and H analysis.…”

“…Apparent molar volume V / of aqueous cellobiose plotted against temperature T and molality m at p = 0.35 MPa. The surface was generated from equation (5) using parameters in table 4. s, experimental valuesfrom table 1; h, reference[14]; D, reference[12]; e, reference[11].…”

Thermodynamics of the hydrolysis reactions of 1,4-β-d-xylobiose, 1,4-β-d-xylotriose, d-cellobiose, and d-maltose

“…Karrer and Fioroni [23] D-cellobiose(cr) + 12 O 2 (g) = 12 CO 2 (g) + 11H 2 O(l) (10) D c H = À5648.5 (kJ Á mol À1 ) 15 Gorokhov and Sryvalin [24] D-cellobiose(cr) + 12 O 2 (g) = 12 CO 2 (g) + 11H 2 O(l) (10) D c H = À5401.5 (kJ Á mol À1 ) 16 Alexander [25] d-cellobioseðaqÞ þ HPO 2À…”

Oligosaccharide Analogues of Polysaccharides, Part 20 , NMR Analysis of Templated Cellodextrins Possessing Two Parallel Chains: A Mimic for Cellulose I?

“…This may be taken as evidence against strong interchain H-bonds of T-x-x (x 1 ± 4). The poor solubiliy of Tx (x 1 ± 4) in H 2 O presumably reflects the influence of the lipophilic template moiety, as evidenced by a comparison with the solubility of cellobiose (210 g/l at 258 [26]), cellotriose (very soluble in cold H 2 O [27]), and cellotetraose (130 g/l in warm H 2 O [27]). Like cellulose, the octaosides T-8 and T-8-8, are insoluble in H 2 O, sparingly soluble in pure N,N-dimethylacetamide (DMA; < 3 g/l), and better soluble in the complex solvent DMA/LiCl (> 20 g/l of T-8 or T-8-8 in DMA containing 30 g/l of LiCl as compared to 150 g/l of cellulose [28]).…”