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|Title:||Partial molar volumes of transfer of some disaccharides from water to aqueous guanidine hydrochloride solutions at 298.15 K|
|Authors:||Banipal, T S|
Lark, B S
Banipal, P K
|Abstract:||Apparent molar volumes (ϕv) of some disaccharides [D(+)-maltose monohydrate, D(+)-cellobiose, D(+)-lactose monohydrate and D(+)-trehalose dihydrate] have been determined in water and in aqueous guanidine hydrochloride solutions (0.5, 1.0, 4.0, 6.0 and 8.0 m) at 298.15 K from density measurements using a vibrating-tube digital densitometer. Partial molar volumes at infinite dilution (Vo2) determined from ϕv values have been utilised to estimate partial molar volumes of transfer (Vo2,tr) for various disaccharides from water to aqueous guanidine hydrochloride solutions. The Vo2,tr values have been found to be positive for all the disaccharides and increase with the increase in the concentration of the cosolute which suggest that overall structural order is enhanced in aqueous guanidine hydrochloride solutions. The Vo2,tr Values have been rationalized in terms of solute-co-solute interactions using co-sphere overlap hydration model. Pair, triplet and quartet interaction coefficients have also been calculated using McMillan-Mayer approach and their sign and magnitude have also been discussed.|
|Appears in Collections:||IJC-A Vol.41A(06) [June 2002]|
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