Novel antimicrobial bioplastic based on PLA-chitosan by addition of TiO2 and ZnO

Journal of Environmental Health Science and Engineering (2021)Cite this article

Abstract

Purpose

The purpose of this study was to develop antimicrobial bioplastics based on Poly Lactic Acid (PLA) with the addition of chitosan-ZnO, and chitosan-TiO2 to improve antimicrobial properties.

Methods

For the preparation of the bioplastics, PLA with chitosan-ZnO or chitosan-TiO2 were used. The antimicrobial activity, mechanical and thermal properties, and water vapor permeability of bioplastics were evaluated.

Results

PLA-chitosan-ZnO indicated a robust antimicrobial activity against bacteria such as Salmonella typhi, Bacillus subtilis, Escherichia coli, Staphylococcus aureus, yeast such as Candida albicans, and fungus Aspergillus niger. No formation of new functional groups in PLA-chitosan-ZnO composites. In comparison to other PLA-based bioplastics, this bioplastic has medium tensile strength, tensile modulus, and elongation percentages with low barrier ability to water vapor. Chitosan-ZnO itself has a greater tensile strength compared to chitosan-TiO2. These two compounds undergo 2 stages of decomposition in a temperature range of 43 °C to 265 °C. The addition of PLA into chitosan-ZnO or chitosan TiO2 causes the bioplastics decomposed in a single stage. It also increases the decomposition temperature of bioplastic. However, compared to chitosan-ZnO or TiO2, the PLA-chitosan-ZnO or TiO2 bioplastics tend to produce a fragile composite indicating by decrease in their tensile strength.

Conclusion

In general, the addition of chitosan-ZnO into in PLA-based bioplastic produces better antimicrobial properties compared to TiO2.

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Affiliations

  1. Research Center for Biomaterials, Indonesian Institute of Sciences (LIPI), Jl Raya Bogor KM 46, Bogor, Cibinong, 16911, Indonesia

    Lisman Suryanegara, Widya Fatriasari, Deni Zulfiana, Sita Heris Anita & Nanang Masruchin

  2. Departement of Chemistry, Faculty of Mathematics and Natural Sciences, IPB University, Bogor, Indonesia

    Sesmi Gutari & Tetty Kemala

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  1. Lisman Suryanegara
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  2. Widya Fatriasari
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Correspondence to Lisman Suryanegara or Widya Fatriasari.

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Suryanegara, L., Fatriasari, W., Zulfiana, D. et al. Novel antimicrobial bioplastic based on PLA-chitosan by addition of TiO2 and ZnO. J Environ Health Sci Engineer (2021). https://doi.org/10.1007/s40201-021-00614-z

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Keywords

  • Antimicrobial properties
  • Bioplastic
  • Poly lactic acid (PLA)
  • Chitosan
  • TiO2
  • ZnO