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Membrane Fluidity

Membrane Fluidity

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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Detergents are used to purify the integral proteins of the membrane. The hydrophobic portion of the detergent can replace membrane phospholipids while solubilizing the membrane proteins. When detergent monomers reach a specific concentration in a solution called critical micelle concentration (CMC), they form micelles. Above CMC, the concentration of the detergent monomers remains in equilibrium with the micelle. The number of detergent monomers present in the CMC varies for each detergent, and...

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Updated: Oct 23, 2025

Author Spotlight: Optimizing Hollow-Fiber Membranes for Continuous Liquid-Liquid Extraction of Medium-Chain Fatty Acids

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Membrane technology for vegetable oil processing-Current status and future prospects.

Subramanian Rangaswamy^1,2, Gopika S Kumar^1,2, Chezhiyan Kuppusamy¹

¹Department of Food Engineering, Central Food Technological Research Institute, Mysuru, India.

Comprehensive Reviews in Food Science and Food Safety

|August 25, 2021

Summary

This summary is machine-generated.

Membrane technology offers significant energy savings in vegetable oil processing, achieving up to 65% reduction in solvent evaporation energy. Further research and pilot plants are crucial for industrial adoption of these advanced membrane desolventizing techniques.

Keywords:

energy savings membrane filtration nonthermal processing solvent recovery vegetable oil

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Area of Science:

Chemical Engineering
Separation Technology

Background:

Membrane technology presents a promising nonaqueous application in vegetable oil processing.
Previous attempts focused on individual refining steps, showing moderate success.
Organic-solvent-nanofiltration has renewed interest in integrated membrane processing for oil extraction.

Purpose of the Study:

To review the current state and potential of membrane technology in vegetable oil processing.
To identify limitations and suggest future research directions for industrial adoption.
To propose a comprehensive process scheme for membrane-based extraction and refining plants.

Main Methods:

Review of existing literature on membrane applications in vegetable oil refining.
Evaluation of membrane-augmented desolventizing for energy savings.
Analysis of integrated membrane processes, including pretreatment and desolventizing.
Consideration of alternate solvents and membrane solvent recovery.

Main Results:

Membrane-augmented desolventizing can achieve approximately 65% energy savings in industrial settings.
Integrated membrane processes, combined with physical refining, offer enhanced benefits.
Membrane solvent recovery is advantageous for alternate solvents with higher thermal energy needs.

Conclusions:

Developing improved membranes and cleaning protocols is essential for stable performance.
Pilot-scale demonstrations are necessary to overcome practical challenges and facilitate industrial adoption.
Solvent selection requires a holistic evaluation of extraction and membrane desolventizing efficiency for specific oils.