Untersuchung zur mikrobiologischen Stabilisierung von Emulsionen

Viele Lebensmittel wie Milch liegen in Form von Öl-in-Wasser-Emulsionen vor, andere wie Butter als Wasser-in-Öl(W/O)-Emulsionen. Gegenstand dieser Arbeit ist die Untersuchung der mikrobiologischen Stabilisierung von Emulsionen durch drei Methoden: Die Stabilisierung von W/O-Emulsionen durch Herstellung hinreichend kleiner Tropfen, die thermische Inaktivierung von Mikroorganismen und die Abtrennung von Mikroorganismen aus Emulsionen mittels Premix-Membranverfahrens

Untersuchung zur mikrobiologischen Stabilisierung von Emulsionen

Viele Lebensmittel wie Milch liegen in Form vo

Water vapor sorption and glass transition temperatures of phase-separated amorphous blends of hydrophobically-modified starch and sucrose

This article contains water vapor sorption data obtained on amorphous blends of octenyl succinic acid-modified (denoted as hydrophobically modified starch; HMS) and sucrose (S) in the anhydrous weight HMS/S ratios between 100/0 and 27/75. The water vapor sorption data was obtained gravimetrically. The amorphous state of the blends was confirmed by X-ray diffraction. The glass transition temperatures of the phase-separated blends are listed; the blends show phase separation into a sucrose-rich phase and a HMS-rich phase, the composition of which varies with the blend ratios. The sucrose-rich phase is characterized by a glass transition temperature Tg,lower that is 40 to 90 K lower than the glass transition temperature Tg,upper of the HMS-rich phase

Phase separation in amorphous hydrophobically modified starch–sucrose blends: Glass transition, matrix dynamics and phase behavior

The phase behavior and matrix dynamics of amorphous blends of octenyl succinic anhydride (OSA) modified starch and sucrose was studied as function of blend composition and water content. Phase separation into two amorphous phases, one enriched in OSA starch and the other in sucrose, was confirmed by differential scanning calorimetry (DSC). DSC and 1H solid-state NMR show that the phase separation is only partial. The glass transition temperature (Tg) of the OSA starch-rich phase was found to be ∼30–100 K higher than the Tg of the sucrose-rich phase, depending on blend composition and water content. A novel type of coupling between changes in physical state of the sucrose-rich phase and plasticizer redistribution is proposed, leading to an unexpected increase of the glass transition temperature of the modified starch-rich phase at higher matrix water contents. A quantitative model for the phase separation of the anhydrous blends into two amorphous phases is presented. The model predicts that, with increasing blend sucrose content, the weight fraction of the sucrose-rich phase decreases, while the sucrose content of both the OSA starch-rich phase and the sucrose-rich phase increases. This novel phenomenon is relevant in the understanding of the stability and performance of multiphase food and pharmaceutical components