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Glucose Homeostasis: Regulation of Blood Glucose01:02

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Glucose transporters facilitate the transport of glucose across the cell membrane. In addition to glucose, some glucose transporters can also aid the movement of other hexoses such as fructose, mannose, and galactose.
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Glucose Absorption Into the Small Intestine01:26

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Complex carbohydrates consumed cannot be absorbed into the small intestine in their original form. First, they must be hydrolyzed to a monosaccharide form such as glucose or galactose. These monosaccharides are then transported across the intestinal membrane and into the blood via transcellular transport. The intestinal epithelial cells allow the movement of these monosaccharides with a defined 'entry' through membrane transporter proteins present on their apical membrane and...
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When a ligand binds to a cell-surface receptor, the receptor's intracellular domain changes shape, which may either activate its enzyme function or allow its binding to other molecules. The initial signal is amplified by most signal transduction pathways. This means that a single ligand molecule can activate multiple molecules of a downstream target. Proteins that relay a signal are most commonly phosphorylated at one or more sites, activating or inactivating the protein. Kinases catalyze...
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A non-enzymatic glucose sensor enabled by bioelectronic pH control.

Xenofon Strakosas1, John Selberg1, Pattawong Pansodtee1

  • 1Department of Electrical and Computer Engineering, University of California Santa Cruz, Santa Cruz, CA, 95064, USA.

Scientific Reports
|July 28, 2019
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Summary
This summary is machine-generated.

This study presents a novel non-enzymatic metal oxide glucose sensor for continuous monitoring in sweat and tears. This new sensor technology overcomes limitations of current devices, offering a longer lifespan for diabetic patients.

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Area of Science:

  • Biomedical Engineering
  • Materials Science
  • Analytical Chemistry

Background:

  • Continuous glucose monitoring (CGM) is crucial for diabetes management.
  • Current enzymatic CGM sensors have limited lifespans, requiring frequent replacement.
  • Existing metal oxide sensors are unsuitable for neutral biofluids like sweat and tears due to high pH operational requirements.

Purpose of the Study:

  • To develop a novel non-enzymatic metal oxide glucose sensor.
  • To enable continuous glucose monitoring in neutral pH biofluids such as sweat and tears.
  • To overcome the limitations of enzymatic sensors and high-pH dependent metal oxide sensors.

Main Methods:

  • Development of a non-enzymatic metal oxide glucose sensor.
  • Implementation of an electronic method to induce localized, reversible pH changes.
  • Testing sensor performance in neutral fluids simulating sweat and tears.
  • Integration with an electronic circuit board for wireless data transmission.

Main Results:

  • Successful glucose monitoring at physiologically relevant concentrations in neutral fluids.
  • Demonstration of a metal oxide sensor functioning effectively outside its typical high-pH range.
  • Wireless data transmission of glucose levels to a personal computer.

Conclusions:

  • The developed non-enzymatic metal oxide sensor offers a promising alternative for CGM in sweat and tears.
  • This technology overcomes the pH limitations of previous metal oxide sensors.
  • The sensor has the potential to improve diabetes management and patient quality of life.