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Related Concept Videos

Lipid Absorption01:24

Lipid Absorption

494
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...
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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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SNARE-mediated Fusion of Single Proteoliposomes with Tethered Supported Bilayers in a Microfluidic Flow Cell Monitored by Polarized TIRF Microscopy
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Triglyceride-Tethered Membrane Lipase Sensor.

Upeksha Mirissa Lankage1, Stephen A Holt1,2, Samara Bridge1

  • 1School of Life Sciences, University of Technology Sydney, Ultimo, NSW 2007, Australia.

ACS Applied Materials & Interfaces
|November 6, 2023
PubMed
Summary
This summary is machine-generated.

We developed a new sensor for measuring lipase activity in real-time without fluorescent labels or lengthy preparation. This impedance-based sensor detects enzymatic hydrolysis of triglycerides, offering a rapid and reliable method for diagnostics.

Keywords:
electrical impedance spectroscopy (EIS)lipase sensorneutron reflectometrytethered lipid membranestriolein

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Area of Science:

  • Biomedical Engineering
  • Analytical Chemistry
  • Enzyme Kinetics

Background:

  • Lipase activity measurement is crucial for enzyme production and medical diagnostics.
  • Current lipase sensors face limitations including fluorescent labels, pH control, and complex assay preparation.
  • A need exists for rapid, label-free, and user-friendly lipase detection methods.

Purpose of the Study:

  • To develop a novel impedance-based sensor for real-time lipase activity detection.
  • To utilize a sparsely tethered triglyceride substrate anchored to a gold electrode.
  • To overcome the limitations of existing lipase sensing technologies.

Main Methods:

  • Self-assembly of a sparsely tethered triglyceride substrate onto a gold electrode using solvent exchange.
  • Formation of an anchored bilayer creating an aqueous reservoir.
  • Measurement of electrical impedance changes to detect membrane defects caused by enzymatic hydrolysis.
  • Utilizing electrical impedance spectroscopy (EIS) for real-time monitoring.

Main Results:

  • The sensor successfully detected real-time lipase activity through impedance changes.
  • Enzymatic hydrolysis of triglycerides induced membrane defects, leading to decreased resistance.
  • The method demonstrated rapid and reliable detection of lipase activity.
  • The sensor operates without fluorescent labels or strict pH control.

Conclusions:

  • A novel, rapid, and reliable impedance-based sensor for lipase activity has been developed.
  • The sensor utilizes a unique anchored substrate design for label-free detection.
  • Potential applications include disease diagnostics, enzyme production monitoring, and point-of-care devices.