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Stability And Interfacial Viscoelasticity Of Oil-Water Nanoemulsions Stabilized By Soy 2 Lecithin And Tween 20 For The Encapsulation Of Bioactive Carvacrol, Jerome J. Nash, Kendra Erk
Stability And Interfacial Viscoelasticity Of Oil-Water Nanoemulsions Stabilized By Soy 2 Lecithin And Tween 20 For The Encapsulation Of Bioactive Carvacrol, Jerome J. Nash, Kendra Erk
School of Materials Engineering Faculty Publications
The rheology of oil-in-water (O/W) droplet interfaces stabilized by food-grade emulsifiers (soy lecithin or Tween 20) under controlled aqueous conditions was investigated to elucidate its contribution in the kinetic stabilization of nanoemulsion-based delivery systems containing carvacrol, a naturally-derived antimicrobial compound. Dilational rheology of surfactant-laden O/W interfaces was measured using axisymmetric drop shape analysis. The kinetic stability of corresponding nanoemulsions (containing mixtures of carvacrol and medium-chain triglyceride (MCT) oil dispersed in water (pH 7)) was characterized using dynamic light scattering. Zwitterionic lecithin molecules adsorbed to the O/W interface for 24 h formed a notably viscoelastic layer, compared to nonionic Tween 20 …
Rheological Investigation Of The Shear Strength, Durability, And Recovery Of Alginate Rafts Formed By Antacid Medication In Varying Ph Environments, Brooke M. Elliott, Kathleen E. Steckbeck, Lisa R. Murray, Kendra Erk
Rheological Investigation Of The Shear Strength, Durability, And Recovery Of Alginate Rafts Formed By Antacid Medication In Varying Ph Environments, Brooke M. Elliott, Kathleen E. Steckbeck, Lisa R. Murray, Kendra Erk
School of Materials Engineering Faculty Publications
The mechanical response of alginate rafts formed by mixing liquid alginate antacid medication (Gaviscon® Extra Strength Liquid Antacid) with acidic solutions was investigated by deforming isolated rafts in a shear rheometer. As rafts were deformed to varying magnitudes of applied strain, rheological parameters were identified and related to the overall strength, durability, and recoverability of rafts formed at different pH (1.1 – 1.7) and aging conditions (0.5 – 4 hr). Rafts formed in the lowest acidity solutions (pH 1.4, 1.7) were elastically weak (G0’ = 60, 42 Pa for un-aged raft) yet maintained their elasticity during applied …