Related Experiment Video
Updated: Aug 11, 2026

09:58
Lipidomics and Transcriptomics in Neurological Diseases
Published on: March 18, 2022
Chemically defined structured lipids: current status and future directions in gastrointestinal diseases
12nd Department of Internal Medicine, Johann Wolfgang Goethe University, Frankfurt, Germany.
International Journal of Colorectal Disease
|June 15, 1999
Summary
Chemically defined structured lipids offer unique benefits over traditional fat mixtures in parenteral and enteral nutrition. These advanced lipids hold significant therapeutic potential for hospitalized patients requiring specialized nutritional support.
Area of Science:
- Nutritional Biochemistry
- Lipid Metabolism
- Clinical Nutrition
Background:
- Traditional nutritional management uses physical mixtures of medium- and long-chain triglycerides.
- Recent advancements include chemically defined structured lipids with unique properties.
- Structured lipids are synthesized via transesterification, combining various fatty acids on a glycerol backbone.
Purpose of the Study:
- To review the current status of structured lipid-based fat emulsions.
- To explore the therapeutic potential of structured lipids in nutritional support.
- To highlight advancements in synthesizing specific structured lipid formulations.
Main Methods:
- Review of experimental and clinical studies on structured lipid emulsions.
- Analysis of synthesis methods including random and specific lipase-mediated transesterification.
- Evaluation of fatty acid incorporation, particularly at the sn-2 position.
Main Results:
- Structured lipids possess distinct chemical, physical, and physiological properties compared to simple fat blends.
- Enzymatic synthesis allows for precise control over fatty acid placement (e.g., sn-2 position).
- Specific fatty acid incorporations are being investigated for modulating membrane composition and absorption.
Conclusions:
- Chemically defined structured lipids represent a significant advancement in nutritional therapy.
- These specialized lipids offer therapeutic advantages for hospitalized patients.
- Further research is warranted to fully elucidate their clinical applications and benefits.
Related Concept Videos
Structure of Lipids
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 birds and...
Membrane Lipids
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.
Phosphatidylcholine, phosphatidylethanolamine, phosphatidylserine, and sphingomyelin are the most common phospholipids present in mammalian membranes. At physiological pH, phosphatidylserine is negatively charged, while the other three...
Phosphatidylcholine, phosphatidylethanolamine, phosphatidylserine, and sphingomyelin are the most common phospholipids present in mammalian membranes. At physiological pH, phosphatidylserine is negatively charged, while the other three...
Assembly of the Lipid Bilayer in the ER
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.
A large chunk of any biological membrane is composed of phospholipids. These lipids have a heterogeneous distribution across different subcellular organelles and even between...
A large chunk of any biological membrane is composed of phospholipids. These lipids have a heterogeneous distribution across different subcellular organelles and even between...
Membrane Lipids
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.
Phosphatidylcholine, phosphatidylethanolamine, phosphatidylserine, and sphingomyelin are the most common phospholipids present in mammalian membranes. At physiological pH, phosphatidylserine is negatively charged, while the other three...
Phosphatidylcholine, phosphatidylethanolamine, phosphatidylserine, and sphingomyelin are the most common phospholipids present in mammalian membranes. At physiological pH, phosphatidylserine is negatively charged, while the other three...
Lipid Absorption
Dietary triglycerides from chyme in the duodenum are mixed with bile salts produced by the liver to emulsify fats. As a result, large droplets are broken down into smaller ones, increasing the surface area for enzymatic action. Once emulsified, pancreatic lipases hydrolyze the triglycerides into free fatty acids and monoglycerides.
These breakdown products bind with bile salts and lecithin to form micelles, which quickly pass between microvilli to come in close contact with the apical...
These breakdown products bind with bile salts and lecithin to form micelles, which quickly pass between microvilli to come in close contact with the apical...
Biosynthesis of Lipids
Microbial membranes exhibit remarkable diversity in lipid composition, reflecting evolutionary adaptations to various environmental conditions. The three domains of life—Bacteria, Archaea, and Eukarya—synthesize membrane lipids through distinct biosynthetic pathways, leading to fundamental structural differences that impact membrane stability, function, and adaptability.Fatty Acid-Based Lipids in Bacteria and EukaryaBacteria and eukaryotes share a common fatty acid biosynthesis pathway, which...

