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Related Concept Videos

Membrane Lipids01:32

Membrane Lipids

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Lipids are an essential component of all biological membranes. The average lipid content in mammalian membranes is 50%, though it can be as low as 20% in the inner mitochondrial membrane or as high as 80% in the myelin sheath present around the nerve cells.
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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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Biological membranes show uneven distribution of different types of lipids in the inner and outer layers, resulting in transverse asymmetric membranes. The treatment of the erythrocyte membrane with the enzyme phospholipase confirmed the asymmetric nature of the lipid bilayer. The enzyme hydrolyzes lipids into fatty acids and hydrophilic groups. The phospholipase acts only on the outer layer of the membrane, while the inner layer remains intact. The phospholipase treatment resulted in 80%...
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Biological membranes are more than just a barrier separating cell cytoplasm from the outside environment. They are highly dynamic and help maintain the integrity and physiological stability of the cells as well as membrane-bound organelles. Membranes also play vital roles in cell-to-cell and intracellular communication.
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Cell membranes are composed of phospholipids, proteins, and carbohydrates loosely attached to one another through chemical interactions. Molecules are generally able to move about in the plane of the membrane, giving the membrane its flexible nature called fluidity. Two other features of the membrane contribute to membrane fluidity: the chemical structure of the phospholipids and the presence of cholesterol in the membrane.
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Milk polar lipids composition and functionality: a systematic review.

Meyya Venkat1, Loo Wee Chia1,2, Tim T Lambers2

  • 1FrieslandCampina Development Centre AMEA, Singapore.

Critical Reviews in Food Science and Nutrition
|August 23, 2022
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Summary
This summary is machine-generated.

Milk polar lipids, including glycerophospholipids and sphingolipids, are vital nutrients. This review details their composition, structure, and health benefits in human and bovine milk.

Keywords:
GlycerophospholipidsMFGMmilksphingophospholipids

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Area of Science:

  • Nutritional Science
  • Lipid Biochemistry

Background:

  • Polar lipids (glycerophospholipids, sphingolipids) are crucial nutrients found abundantly in milk, especially for infants.
  • Milk fat globule membrane (MFGM) is the primary structural and compositional unit for milk polar lipids.

Approach:

  • Systematic review of 2840 records, with 378 studies included for analysis.
  • Focused on human and bovine milk polar lipid composition, MFGM structure, formulation sources, and physiological functions.

Key Points:

  • Bovine milk polar lipid yield and composition vary significantly with dairy stream selection and processing methods.
  • Human milk polar lipid concentration is influenced by lactational stage and maternal diet; bovine milk levels are primarily affected by overall milk lipid concentration.
  • Milk polar lipids are organized within the MFGM, forming a tri-layer structure around triglycerides.

Conclusions:

  • The health benefits of milk polar lipids are well-established, particularly for brain development, immune function, and lipid metabolism.
  • Emerging research highlights the structure-function relationship of MFGM and the superior bioactivity of milk-derived polar lipids over plant-based alternatives.
  • Further research into MFGM structure and the unique properties of milk polar lipids can drive innovation in food development.