Related Experiment Video
Updated: Jan 30, 2026
Solubility of Hydrophobic Compounds in Aqueous Solution Using Combinations of Self-assembling Peptide and Amino Acid
Published on: September 20, 2017
Self-assembly of amino acid-based random copolymers for antibacterial application and infection treatment as
1Key Laboratory of Textile Science and Technology, Ministry of Education, College of Textiles, Donghua University, Songjiang District, Shanghai 201620, China.
Abstract:
Bacterial infection is one of the most significant complications worldwide and has been one of the main factors of morbidity and mortality for the chronic wounds. Considering the negative charged feature of bacterial pathogens, a positive charged poly(ester amide) (PEA) micellar system based on lysine, arginine and phenylalanine is developed. In this study, a serials of PEA random copolymers can be obtained by altering the sorts of amino acids and feed ratio, and the self-assembled PEA micelles with an average diameter ranging from 150 to 200 nm exhibit the integrated properties of excellent biocompatibility and enzymatic biodegradation. More interesting, the degraded random block micelles can reassemble into smaller sized micelles with the diameter less than 20 nm which have promising applications in drug delivery. The PEA micellar nanocarriers display an intrinsic antibacterial property due to the pendant groups of lysine and arginine based moieties and this killing capacity can be enhanced by grafting levofloxacin without losing the original performance. The in vitro antibacterial evaluation proves all of the micelles display a concentration dependent efficiency of killing bacteria (up to 99.99%). The in vivo Staphylococcus aureus induced infection model demonstrates that the micelles are effective in killing the bacteria and infection treatment. The successful synthesis of the biocompatible and biodegradable amino acid based micellar nanocarriers may provide new insights into the development of biomedical materials for antibacterial applications and drug delivery.
Insights
A novel positively charged poly(ester amide) micellar system effectively combats bacterial infections in chronic wounds. These biocompatible, biodegradable micelles show significant antibacterial properties and potential for enhanced drug delivery applications.
Area of Science:
- Biomaterials Science
- Polymer Chemistry
- Nanotechnology
Background:
- Bacterial infections are a major cause of morbidity and mortality in chronic wounds.
- Developing effective antibacterial strategies is crucial for wound management.
- The negative charge of bacterial pathogens suggests potential for positively charged materials.
Purpose of the Study:
- To develop a positively charged poly(ester amide) (PEA) micellar system for antibacterial applications.
- To investigate the properties, antibacterial efficacy, and drug delivery potential of these novel micelles.
Main Methods:
- Synthesis of PEA random copolymers using lysine, arginine, and phenylalanine.
- Characterization of self-assembled PEA micelles (size, biocompatibility, biodegradability).
- Evaluation of intrinsic antibacterial activity and drug-loaded micelle performance in vitro and in vivo.
Main Results:
- PEA micelles (150-200 nm) demonstrated excellent biocompatibility and enzymatic biodegradability.
- Degraded micelles could reassemble into smaller nanoparticles (<20 nm) for drug delivery.
- Micelles exhibited intrinsic antibacterial properties, enhanced by levofloxacin grafting, achieving up to 99.99% bacterial killing.
- In vivo studies confirmed efficacy in treating Staphylococcus aureus infections.
Conclusions:
- Amino acid-based PEA micellar nanocarriers offer a promising platform for antibacterial applications.
- These biocompatible and biodegradable materials show potential for advanced wound management and drug delivery.
- The study provides new insights into developing next-generation biomedical materials for infection control.
More Related Videos
Related Concept Videos
03:42Amino acids
01:18Amino Acid Catabolism
01:29Amino Acid Biosynthetic Pathways
02:33Lewis Acids and Bases
A coordinate covalent bond (or dative bond) occurs when one of the atoms in the bond provides both bonding electrons. For example, a coordinate covalent bond occurs when a water molecule combines with a hydrogen ion to form a hydronium ion. A coordinate covalent bond also results when...
02:54Ions as Acids and Bases
Salts are ionic compounds composed of cations and anions, either of which may be capable of undergoing an acid or base ionization reaction with water. Aqueous salt solutions, therefore, may be acidic, basic, or neutral, depending on the relative acid-base strengths of the salt’s constituent ions. For example, dissolving the ammonium chloride in water results in its dissociation, as described by the equation:
02:58Bronsted-Lowry Acids and Bases