title: Protection of a model protein, lactate dehydrogenase by encapsulation in liposome.
abstract: The objective of this study was to determine if encapsulating a model protein, lactate dehydrogenase (LDH), inside liposomes can protect it during storage, upon freeze-thaw cycles and during freeze-drying. LDH, which undergoes cold denaturation, was entrapped insides liposomes prepared using modification of Bangham's method. It was found that when LDH was entrapped in liposomes and subjected to a single freeze-thaw treatment, there was about 7 times more recovery of activity than when LDH was free in solution. Similarly, LDH encapsulated in liposomes showed 60% recovery after freeze-drying compared to 1-2% recovery for the unentrapped LDH. The role of phospholipid content, residual moisture content and protein content were evaluated. Possible mechanism(s) of cold temperature inactivation of proteins and role of liposomes in preventing such cryodenaturation will be discussed in light of these results.
authors.affiliation: Department of Pharmaceutics, University of Tennessee, Memphis, USA.
authors.forename: S
authors.initials: S
authors.lastname: Nema
authors.forename: K E
authors.initials: KE
authors.lastname: Avis
mesh_terms: D004339:Drug Compounding; D005612:Freeze Drying; D005615:Freezing; D007527:Isoenzymes; D007770:L-Lactate Dehydrogenase / Q000737:chemistry*; D008081:Liposomes
chemical_list: D007527:Isoenzymes; D008081:Liposomes; D007770:L-Lactate Dehydrogenase