Abstract
Background The surface energy the phospholipidic spherical membrane vs. pH, see Fig. 4A helped us to understand amphoteric character of cartilage surface (introduced together first time in literature) [4]. Methods The samples of articular cartilage were taken from the knees of an aged one to two-years-old ox. Friction coefficient (cartilage/cartilage) pair and the interfacial energy of a spherical lipid bilayer curves vs pH have “a bell-shaped curve” expressing amphoteric cartilage nature by the isoelectric point (IEP). Results It was found that the lowest energy values cover working conditions at pH 7.3 (±) 1.0 of natural joints, see Fig.4 A, B. The obtained “a bell-shaped curve” for (cartilage/cartilage) pair friction and spherical PLs bilayer is a novelty in this paper. Conclusions The observations have led to the conclusion that friction coefficient (cartilage/cartilage) pair and surface energy of a spherical lipid bilayer curves vs pH have (IEP) and expressing amphoteric surfaces character. The surface energy corresponds well with friction coefficient phospholipid amphoteric bilayer surface.
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