Implementation of a Lipoprotein Isolation Method in a Lipidomic High-throughput Workflow

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dc.contributor Helsingin yliopisto, Maatalous-metsätieteellinen tiedekunta fi
dc.contributor University of Helsinki, Faculty of Agriculture and Forestry en
dc.contributor Helsingfors universitet, Agrikultur- och forstvetenskapliga fakulteten sv
dc.contributor.author Sylvänne, Tuulia
dc.date.issued 2013
dc.identifier.uri URN:NBN:fi:hulib-201507212089
dc.identifier.uri http://hdl.handle.net/10138/40282
dc.description.abstract Lipoproteins play a central role in the disease mechanisms of cardiovascular diseases (CVD) and therefore they have been studied widely. They carry several classes of apolipoproteins where apo-A1 and apo-B are the major classes. The sucrose based sequential lipoprotein isolation method can retrieve the lipoprotein fractions suitable for lipidomics analyses. The main lipoprotein classes are very low-density lipoprotein (VLDL), low-density lipoprotein (LDL) and high density lipoprotein (HDL) that can be isolated easily by their density from human blood plasma or serum. Lipidomics analyses can quantify lipids that lipoproteins carry in the circulation. Mainly they carry cholesterol and its esterified forms, glycerolipids, small amounts of sphingolipids and phospholipids form their monolayer membrane. The isolation method was set-up together with scaled-down sample volumes. The protein and lipid content of the main lipoprotein fractions were evaluated by electrophoresis analysis, various enzymatic assays and lipidomics analyses. The total protein and apolipoprotein content was found to be similar as in the literature. Apo-B was found to be the main apolipoprotein in the VLDL and the LDL fractions whereas apo-A1 was the main apolipoprotein in the HDL fractions. Triglycerides (TG) were measured by enzymatic analysis and TG was mainly found in LDL and VLDL. The lipidomics analyses demonstrated the lipid content of the lipoproteins were similar as in the literature with minor changes. The main lipid class found in all the lipoproteins was cholesteryl esters (CE) followed by phosphatidylcholines (PC) that are commonly found in cell membranes. Sphingolipids such as ceramides were also detected in lipid class level only in small quantities in the lipoprotein fractions. The low initial sample volume did not correlate linearly with higher sample volume and low sample volume is not recommended to use in this specific isolation method. Based on the results of the comprehensive screening of isolated lipoproteins the isolation method was successfully established. en
dc.language.iso eng
dc.publisher Helsingfors universitet sv
dc.publisher University of Helsinki en
dc.publisher Helsingin yliopisto fi
dc.subject cardiovascular diseases en
dc.subject lipoproteins en
dc.subject glycerolipids en
dc.subject phospholipids en
dc.subject sphingolipids en
dc.subject lipidomics en
dc.title Implementation of a Lipoprotein Isolation Method in a Lipidomic High-throughput Workflow en
dc.type.ontasot pro gradu-avhandlingar sv
dc.type.ontasot pro gradu -tutkielmat fi
dc.type.ontasot master's thesis en
dc.subject.discipline Bioteknik sv
dc.subject.discipline Biotechnology en
dc.subject.discipline Biotekniikka fi
dct.identifier.urn URN:NBN:fi:hulib-201507212089

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