Non-ionic surfactant interactions in aqueous gelatin solution: A physico-chemical investigation

✍ Scribed by S. Chauhan; J. Jyoti; G. Kumar

• Publisher: Elsevier Science
• Year: 2011
• Tongue: English
• Weight: 825 KB
• Volume: 159
• Category: Article
• ISSN: 0167-7322
• DOI: 10.1016/j.molliq.2011.01.008

✦ Synopsis

In the present study, density and sound velocity measurements of non-ionic surfactant Triton X-100 (TX-100) in aqueous solutions of gelatin have been carried out over a wide temperature range (20-40 °C). Molar volume (ϕ v ) has been calculated from density measurements and various acoustical parameters such as apparent adiabatic compressibility (β) and apparent molar compressibility (ϕ k ) have been calculated from the sound velocity data in order to account for the consequences of protein-surfactant interactions. Negative values of ϕ v over an entire temperature range suggest that the protein-surfactant interactions are predominantly hydrophobic. Initial sharp increase in ϕ v values at low surfactant concentration indicates some hydrophilic interactions as well and leveling off at higher surfactant concentration could be due to self aggregation of TX-100 to form micelles. Further information to this effect has been obtained by evaluating activation energy parameters following viscosity studies. UV-Vis studies have also been carried out in case of ternary Protein-Surfactant-Water system by varying TX-100 concentration in the range (0.00043 M-0.16756 M).