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- W2010016292 abstract "Two prevailing theories for dry membrane preservation are the water replacement hypothesis and glass formation. A manifestation of the water replacement hypothesis is the ability of sugars to depress dry membrane main phase transition temperatures (Tm). Differential scanning calorimetry (DSC) was employed to test the effects of sugars (trehalose, α-lactose, maltose and glucose) on the Tms of slowly frozen, lyophilized liposomes prepared from hydrogenated egg phosphatidycholine [HEPC], dipalmitoylphosphatidylcholine [DPPC] and palmitoyloleoylphosphatidylcholine [POPC]. For each lyophilized phospholipid membrane, the disaccharides caused significant Tm reduction to at least 14°C below the hydrated membrane Tms. The Tm-reduction was achieved by heating the lyophilized product: an annealing process that included a membrane phase transition and a disaccharide glass transition. Thermogravimetric analysis (TGA) showed residual water loss (3–6%) during annealing and FTIR spectra suggested an annealing-induced disaccharide/phospholipid-carbonyl interaction. Scanning electron microscopy (SEM) showed an amorphous appearance of the lyophilized trehalose/HEPC matrix, which was confirmed by DSC to be glassy, and which remained intact after annealing. Also observed with SEM were membrane infolding, fusion of unprotected liposomes, and matrix porosity. Discussed are the potential implications of annealing, dry membrane Tm-reduction and glass formation for liposome dehydroprotection." @default.
- W2010016292 created "2016-06-24" @default.
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- W2010016292 date "1994-08-01" @default.
- W2010016292 modified "2023-09-25" @default.
- W2010016292 title "Phase transition temperature reduction and glass formation in dehydroprotected lyophilized liposomes" @default.
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- W2010016292 doi "https://doi.org/10.1016/0168-3659(94)90253-4" @default.
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