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Boosting Antibacterial Efficacy of Silicon Quantum Dots through Chiral Surface Engineering
Kairen Zhao1, Lin Hou1, Feng Li1
1Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education; Key Laboratory of Analytical Chemistry for Life Science of Shaanxi Province, School of Chemistry & Chemical Engineering, Shaanxi Normal University, Xi'an 710119, China.
ACS Applied Materials & Interfaces
|March 18, 2026
Summary
Chiral silicon quantum dots (SiQDs) show enhanced antibacterial activity against S. aureus and E. coli. This chirality significantly boosts SiQD performance, offering a promising alternative to traditional antibiotics.
Area of Science:
- Materials Science
- Nanotechnology
- Biochemistry
Background:
- Antibiotic resistance is a major global health concern, necessitating novel antimicrobial approaches.
- Silicon quantum dots (SiQDs) show potential as antimicrobial agents with reduced resistance risk, but conventional SiQDs have limited efficacy.
- Chirality is explored as a strategy to enhance nanomaterial antibacterial properties.
Purpose of the Study:
- To synthesize and evaluate the antibacterial activity of chiral silicon quantum dots (SiQDs).
- To investigate the role of chirality in enhancing the antimicrobial efficacy of SiQDs.
- To explore the potential of chiral SiQDs in anti-infective applications and on material surfaces.
Main Methods:
- Chiral SiQDs (D-SiQDs and L-SiQDs) were synthesized using a one-step polymerization method with APTMS and d- or l-cysteine.
- Antibacterial activity was tested against Staphylococcus aureus (S. aureus) and Escherichia coli (E. coli).
- Mechanistic studies assessed membrane damage, nucleic acid leakage, and ATP depletion; cytotoxicity and fabric application were also evaluated.
Main Results:
- D-SiQDs demonstrated significantly enhanced antibacterial activity compared to achiral SiQDs against both S. aureus and E. coli.
- Sterilization rates of 95% were achieved with D-SiQDs at 50 μg/mL for S. aureus and 250 μg/mL for E. coli.
- D-SiQDs induced greater membrane damage, nucleic acid leakage, and ATP depletion in S. aureus, showing minimal cytotoxicity and conferring antibacterial properties to fabrics.
Conclusions:
- Chirality significantly enhances the antibacterial performance of silicon quantum dots.
- Chiral SiQDs represent a potent and biocompatible alternative to conventional antibiotics.
- The findings support the development of chiral nanomaterials for advanced anti-infective strategies and material functionalization.
