Density (

ρ

) and viscosity (

η

) measurements were carried out for 4-aminobutyric acid in 0.0041

0.0125 and 0.0207 mol·L

-1

aqueous salbutamol sulphate at

T

=308.15

313.15 and 318.15K.The measured values of density and viscosity

were used to estimate some important parameters such as apparent molar volume V

φ

limiting apparent molar volume

V

φ

0

transfer volume △

V

φ

0

hydration number

n

H

second derivative of infinite dilution of partial molar volume with temperature ∂

2

V

φ

0

/∂T

2

viscosity B-coefficients

variation of

B

with temperature d

B

/d

T

free energy of activation per mole of solvent △

μ

1

0*

and solute △

μ

2

0*

activation entropy △

S

2

0*

and activation enthalpy △

H

2

0*

of the amino acids.These parameters have been interpreted in terms of solute-solute and solute-solvent interactions and structure making/breaking ability of solutes in the given solution.