NDLI: Effect of the enzymatically modified supported dipalmitoylphosphatidylcholine (DPPC) bilayers on calcium carbonate formation

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Effect of the enzymatically modified supported dipalmitoylphosphatidylcholine (DPPC) bilayers on calcium carbonate formation

Content Provider	Semantic Scholar
Author	Szcześ, Aleksandra
Copyright Year	2016
Abstract	After an hour contact with a phospholipase A2 (PLA2) solution, only the outer leaflet of the dipalmitoylphosphatidylcholine (DPPC) bilayers supported on mica surface underwent hydrolysis whose products, i.e., palmitic acid and lysophospholipid, accumulated on the bilayer surface. Only calcite was present on the bare mica and enzymatically unmodified and modified supported DPPC bilayers soaked for 2 weeks at 25 and 37 °C in a solution of initial pH equals to 7.4 and 9.2 containing calcium and bicarbonate ions at their concentrations about those of human blood plasma. The DPPC bilayers accelerate the crystal growth at lower pH and favors CaCO3 nucleation at higher pH. Enzymatic modification of bilayers does not affect crystal morphology and its organization on the examined surface but causes a slight crystal size increase at lower pH and significantly reduces crystal size at alkaline pH. The temperature increase leads to the formation of bigger crystals under physiological pH and has almost no effect on crystal size at alkaline pH. The obtained results are probably attributed to Ca2+ interaction with a specific polar site on the surface of the membrane and DPPC hydrolysis products acting as nucleation centers.
Starting Page	409
Ending Page	419
Page Count	11
File Format	PDF HTM / HTML
PubMed reference number	26855469v1
Volume Number	294
Journal	Colloid and polymer science
Language	English
Access Restriction	Open
Subject Keyword	1,2-Dipalmitoylphosphatidylcholine Acids Bicarbonates Calcite Calcium Carbonate Calcium ion Carbonates Carboxyl Group Fever Greater Ions Iontophoresis Leaflet Device Component Palmitic Acid Phospholipase Phospholipases A2 Phospholipids Physiologic calcification Plasma Thioctic Acid Tissue membrane inorganic phosphate lysophosphatidic acid
Content Type	Text
Resource Type	Article

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