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Related Concept Videos

What are Proteins?01:28

What are Proteins?

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Proteins are polymers of amino acids linked together by peptide bonds. Proteins and polypeptides are interchangeably used to refer to long chains of amino acids. However, polypeptides have a molecular weight of fewer than 10,000 daltons, while proteins have greater molecular weight.  Polypeptides with less than 20 amino acids are called oligopeptides or simply peptides. Interactions among the constituent amino acid side chains of proteins help them fold into a stable 3-dimensional...
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Amino acids are the monomers that comprise proteins. Each amino acid has the same fundamental structure, which consists of a central carbon atom, or the alpha (α) carbon, bonded to an amino group (NH2), a carboxyl group (COOH), and to a hydrogen atom. Every amino acid also has another atom or group of atoms bonded to the central atom known as the R group. There are 20 common amino acids present in proteins, each with a different R group. Variation in the amino acid sequence is responsible...
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A peptide bond covalently attaches amino acids through a dehydration reaction. One amino acid's carboxyl group and another amino acid's amino group combine, releasing a water molecule. The resulting bond is the peptide bond. The products that such linkages form are peptides. As more amino acids join this growing chain, the resulting chain is a polypeptide. Each polypeptide has a free amino group at one end. This end has the N-terminal, or the amino-terminal, and the other end has a free...
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Flexible Proton-Conducting Biocomposites Based on Amino Acid Biomolecules.

Jiajie Sui1, Shuting Wang1, Ruoxing Wang1

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Summary

Researchers created a new flexible proton-conducting film using poly(acrylic acid), amino acids, and glycerol. This material shows promise for self-powered wearable electronics and biointegrated devices.

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Amino acidsBiocompositeConductive biomaterialFlexible electronicsMoisture electric generation

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Area of Science:

  • Materials Science
  • Biomaterials Engineering
  • Bioelectronics

Background:

  • Proton-conducting biomaterials are key for bioelectronics due to biocompatibility and tunable properties.
  • Existing protein-based materials face challenges with humidity-dependent conductivity, stability, and brittleness.
  • Developing robust and flexible proton conductors is crucial for advanced bioelectronic applications.

Purpose of the Study:

  • To develop a stable, flexible, and efficient proton-conducting biocomposite film.
  • To overcome the limitations of traditional protein-based proton conductors.
  • To demonstrate the potential of the novel biocomposite in energy harvesting devices.

Main Methods:

  • Integration of amino acids and glycerol into a poly(acrylic acid) (PAA) matrix to form a biocomposite film.
  • Characterization of the film's proton conductivity, flexibility, and stability under varying conditions.
  • Fabrication and testing of a moisture electric generator (MEG) utilizing the biocomposite film as the active layer.

Main Results:

  • The PAA-amino acid-glycerol biocomposite exhibited excellent flexible proton conductivity, comparable to dried natural proteins.
  • The film demonstrated enhanced stability under moderate mechanical stress and improved water management.
  • The developed film successfully powered a moisture electric generator, producing a stable voltage of ~0.17 V and a short-circuit current of 0.18 μA.

Conclusions:

  • The novel PAA-amino acid-glycerol biocomposite offers a promising solution for limitations in current proton-conducting biomaterials.
  • This material demonstrates significant potential for next-generation self-powered wearable electronics.
  • The findings pave the way for advanced biointegrated devices utilizing efficient and stable proton conductors.