The Interaction Between Surfactants and 2‐Hydroxy‐3‐(N,N‐dimethyl‐N‐dodecylammonium)‐propyloxy Starches

Abstract

The phase behavior of temperature-responsive hydrophobically modified starches and the interaction between oxidized potato amylose and hydrophobically modified potato amylopectin have been investigated by rheology, turbidity measurements and differential scanning calorimetry. When oxidized amylose was mixed with hydrophobically modified amylopectin, a viscosity peak was observed, indicative of a guest-host interaction between the oxidized amylose and the hydrophobically modified amylopectin. A series of oxidized and hydrophobically modified potato starches were investigated in the presence of an anionic and cationic surfactant. A coil-helix transition of the investigated starches was observed in the presence of surfactant, with the exception of a cationic surfactant combined with a hydrophobically modified zwitterionic starch of high positive net charge. The destabilizing mechanism (the phase separation) of the hydrophobically modified starches was studied as well as the difference in stabilizing capacity between the investigated cationic and anionic surfactants.

Composition and Film Properties of Temperature Responsive, Hydrophobically Modified Potato Starch

“…The less tightly bound complex thus starts to melt at a lower temperature. It is also possible that internal inclusion complexes are formed between the dodecyl part of the substituent and the amylose chain [22] or that the long dodecyl side chains compete to form partial complexes with the LPC molecules. There may also be some unfavorable interactions due to the presence of positively charged quaternary amine groups on both the HONP and the LPC molecules which lead to incomplete complex formation.…”

Surfactant Structure-Dependent Interactions with Modified Starch Nanoparticles Probed by Fluorescence Spectroscopy

“…To this end, the preparation of hydrophobically modified starch (HMS) with octenyl succinic anhydride, − cholesterol, acetyl, propionyl, hexanoyl, oleyl, stearyl, epoxyalkanes, and propyl substituents has been reported and the ability of these HMSs to interact with hydrophobic drugs ,,,, or stabilize oil droplets in emulsions ,, has been described. As for any hydrophobically modified water-soluble polymer, the properties of HMS can also be adjusted by the addition of surfactants and a number of studies have investigated the effect that surfactant/HMS interactions have on the stability of emulsions where HMS acts as colloidal stabilizer. ,− …”