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What are Lipids?01:38

What are Lipids?

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What are Lipids?01:31

What are Lipids?

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Lipids function as structural components of cellular membranes, in addition to acting as energy reservoirs and signaling molecules. They are thus crucial to all living organisms.  The three biologically important classes of lipids are triglycerides, phospholipids, and steroids.
Non-Polar and Hydrophobic Characteristics of Lipids
Lipids are a structurally and functionally diverse group of hydrocarbons—compounds consisting of carbon and hydrogen atoms. The carbon-carbon and...
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Lipids are large molecules that are generally not water-soluble. Since most of the digestive enzymes in the human body are water-based, there are specific steps the body must take to break down lipids and make them available for use.
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Lipids include a diverse group of compounds that are largely nonpolar in nature. This is because they are hydrocarbons that include mostly nonpolar carbon-carbon or carbon-hydrogen bonds. Non-polar molecules are hydrophobic (“water fearing”), or insoluble in water. Lipids perform many different functions in a cell. Cells store energy for long-term use in the form of fats. Lipids also provide insulation from the environment for plants and animals. For example, they help keep aquatic...
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In the plasma membrane, the lipids forming the bilayer can also act as an anchor to tether proteins to the membrane. The three main types of lipid anchors found in eukaryotes are – prenyl groups, fatty acyl groups, and glycosylphosphatidylinositol or GPI groups. Prenyl and fatty acyl groups act as anchors on the cytosolic surface of the membrane, whereas GPI anchors proteins on the extracellular side.
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Lipid Catabolism01:25

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Triglycerides serve as crucial long-term energy storage molecules in microorganisms, providing a dense source of metabolic energy. Their breakdown is mediated by lipases, which hydrolyze triglycerides into glycerol and free fatty acids. Each of these components follows distinct metabolic pathways, ultimately contributing to ATP synthesis and cellular energy homeostasis.Glycerol MetabolismGlycerol, released from triglyceride hydrolysis, is phosphorylated by glycerol kinase to form...
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Quantification of Lipids: Model, Reality, and Compromise.

Spiro Khoury1,2, Cécile Canlet3,4, Marlène Z Lacroix5

  • 1Centre des Sciences du Goût et de l'Alimentation, AgroSup Dijon, CNRS, INRA, Université Bourgogne Franche-Comté, 9E Boulevard Jeanne d'Arc, F-21000 Dijon, France. spiro.khoury@inra.fr.

Biomolecules
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Summary

Quantifying diverse lipids is essential for lipidomics. This review covers analytical techniques like nuclear magnetic resonance (NMR) and mass spectrometry for accurate lipid measurement.

Keywords:
lipidomicmass spectrometrynuclear magnetic resonancequantificationuniversal detector

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Area of Science:

  • Biochemistry
  • Analytical Chemistry
  • Lipidomics

Background:

  • Lipids play vital roles in numerous biological processes.
  • Accurate lipid quantification is critical for many research studies and the advancement of lipidomics.
  • The structural diversity of lipids presents significant analytical challenges.

Purpose of the Study:

  • To review current techniques for lipid analysis and quantification.
  • To discuss the state-of-the-art in quantitative lipidomics, including definitions and standardization.
  • To examine the technical considerations and limitations of analytical tools for absolute lipid quantification.

Main Methods:

  • Review of analytical techniques including Nuclear Magnetic Resonance (NMR) spectroscopy.
  • Analysis of Mass Spectrometry (MS) based methods, with and without chromatography.
  • Discussion of universal detectors for lipid analysis.

Main Results:

  • Various analytical techniques exist for lipid analysis, each with specific strengths and weaknesses.
  • Standardization and clear definitions are crucial for reliable quantitative lipidomics.
  • Absolute quantification of lipids remains a challenge due to their complexity and diversity.

Conclusions:

  • Effective lipid quantification requires careful selection and application of appropriate analytical techniques.
  • Advancements in NMR, MS, and universal detectors are improving lipid analysis capabilities.
  • Addressing the challenges in absolute quantification is key to unlocking the full potential of lipidomics research.