title: Stearic acid based oleogels: a study on the molecular, thermal and mechanical properties.
abstract: Stearic acid and its derivatives have been used as gelators in food and pharmaceutical gel formulations. However, the mechanism pertaining to the stearic acid based gelation has not been deciphered yet. Keeping that in mind, we investigated the role of stearic acid on physic-chemical properties of oleogel. For this purpose, two different oil (sesame oil and soy bean oil) formulations/oleogels were prepared. In depth analysis of gel kinetics, gel microstructure, molecular interactions, thermal and mechanical behaviors of the oleogels were done. The properties of the oleogels were dependent on the type of the vegetable oil used and the concentration of the stearic acid. Avrami analysis of DSC thermograms indicated that heterogeneous nucleation was coupled with the one-dimensional growth of gelator fibers as the key phenomenon in the formation of oleogels. Viscoelastic and pseudoplastic nature of the oleogels was analyzed in-depth by fitting the stress relaxation data in modified Peleg's model and rheological studies, respectively. Textural studies have revealed that the coexistence of hydrogen bond dissipation and formation of new bonds is possible under stress conditions in the physical oleogels.
authors.affiliation: Department of Biotechnology and Medical Engineering, National Institute of Technology, Rourkela 769008, India.
authors.forename: S S
authors.initials: SS
authors.lastname: Sagiri
authors.affiliation: Department of Biotechnology and Medical Engineering, National Institute of Technology, Rourkela 769008, India.
authors.forename: Vinay K
authors.initials: VK
authors.lastname: Singh
authors.affiliation: Department of Biotechnology and Medical Engineering, National Institute of Technology, Rourkela 769008, India. Electronic address: pal.kunal@yahoo.com.
authors.forename: K
authors.initials: K
authors.lastname: Pal
authors.affiliation: Department of Biotechnology and Medical Engineering, National Institute of Technology, Rourkela 769008, India.
authors.forename: I
authors.initials: I
authors.lastname: Banerjee
authors.affiliation: School of Bioscience & Engineering, Jadavpur University, Kolkata 700032, India.
authors.forename: Piyali
authors.initials: P
authors.lastname: Basak
mesh_terms: D004548:Elasticity; D006358:Hot Temperature; D009930:Organic Chemicals / Q000737:chemistry; D012715:Sesame Oil / Q000737:chemistry*; D013024:Soybean Oil / Q000737:chemistry*; D013229:Stearic Acids / Q000737:chemistry*; D014783:Viscosity
chemical_list: D009930:Organic Chemicals; D013229:Stearic Acids; C016021:oleogels; C031183:stearic acid; D013024:Soybean Oil; D012715:Sesame Oil
keywords: Avrami analysis; Drug delivery; Edible oils; Modified Peleg analysis; Oleogels; Stearic acid