Biocompatible chitin-encapsulated CdS quantum dots: Fabrication and antibacterial screening

Matin Jasli Lim, Nurulizzatul Ningsheh M. Shahri, Hussein Taha, Abdul Hanif Mahadi, Eny Kusrini, Jun Wei Lim, Anwar Usman

Research output: Contribution to journalArticlepeer-review

Abstract

Chitin-encapsulated cadmium sulfide quantum dots (CdS@CTN QDs) were successfully synthesized from chitin and Cd(NO3)2 precursor using the colloidal chemistry method, toward the development of biocompatible and biodegradable QDs for biomedical applications. CdS@CTN QDs exhibited the nanocrystalline cubic CdS encapsulated by α-chitin. The average particle size of CdS@CTN QDs was estimated using empirical Henglein model to be 3.9 nm, while their crystallite size was predicted using Scherrer equation to be 4.3 nm, slightly larger compared to 3-mercaptopropionic acid-capped CdS QDs (3.2 and 3.6 nm, respectively). The mechanism of formation was interpreted based on the spectroscopic data and X-ray crystal structures of CdS@CTN QDs fabricated at different pH values and mass ratios of chitin to Cd(NO3)2 precursor. As an important step to explore potential biomolecular and biological applications of CdS@CTN QDs, their antibacterial activities were tested against four different bacterial strains; i.e. Escherichia coli, Bacillus subtillus, Staphylococcus aureus and Pseudomonas aeruginosa.

Original languageEnglish
Article number117806
JournalCarbohydrate Polymers
Volume260
DOIs
Publication statusPublished - 15 May 2021

Keywords

  • Antibacterial activity
  • Cadmium sulfide
  • Chitin
  • Encapsulation
  • Quantum dots

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