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Absence of subtransition in racemic dipalmitoylphosphatidylcholine vesicles
Authors:Athanas I. Boyanov  Boris G. Tenchov  Rumiana D. Koynova  Kamen S. Koumanov
Affiliation:Central Laboratory of Biophysics, Bulgarian Academy of Sciences, Acad. G. Bonchev. Str. Bl. 6, Sofia 1113 Bulgaria
Abstract:dl-Dipalmitoylphosphatidylcholine multilamellar vesicle suspensions were examined by the method of differential scanning calorimetry. A lack of the subtransition at 18°C was established. Such a subtransition is characteristic for l-dipalmitoylphosphatidylcholine suspensions. This lack is supposed to be the result of the impossibility of the racemic phospholipid mixture to form the low-temperature crystal structure Lc.
Keywords:Phospholipid vesicle  Dipalmitoylphosphatidylcholine  Racemic mixture  Phase transition  Differential scanning calorimetry
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