AI Article Synopsis
- Researchers created an antimicrobial thermoplastic starch (TPS) by mixing it with chlorhexidine gluconate (CHG) and epoxy resin (Er), which improved its strength and hardness significantly, especially at 5 wt% of Er.
- The addition of epoxy resin also enhanced water resistance and confirmed chemical reactions through advanced analyses, indicating a successful blending of materials.
- While some blends showed effectiveness against both Staphylococcus aureus and Bacillus cereus, the highest concentrations of epoxy resin primarily inhibited only Staphylococcus aureus, with several blends also effective against yeast.
Article Abstract
An antimicrobial thermoplastic starch (TPS) was developed by melt-mixing TPS with chlorhexidine gluconate (CHG) and epoxy resin (Er). The tensile strength and hardness of the TPSCh blend increased with the addition of Er (TPSCh/Er), especially at 5 wt% Er (TPSCh/Er5) (19.5 MPa and 95 %, respectively). The water contact angle of TPSCh/Er was higher than those of TPS and TPSCh because of the improved interfacial tension. Fourier transform infrared and nuclear magnetic resonance analyses confirmed the reaction between the epoxy groups of Er, hydroxyl groups of starch, and amino groups of CHG. TPSCh/Er5 exhibited a significantly lower CHG release than TPSCh owing to the rearrangement of TPSCh chains via Er crosslinking. TPSCh/Er0.5 and TPSCh/Er1 showed inhibition zones against both tested bacteria (Staphylococcus aureus and Bacillus cereus), whereas TPSCh/Er2.5, TPSCh/Er5, and TPSCh/Er10 showed inhibition zones only against S. aureus. Moreover, TPSCh and TPSCh/Er0.5-2.5 exhibited inhibition zones with Saccharomyces cerevisiae.
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| http://dx.doi.org/10.1016/j.carbpol.2022.120328 | DOI Listing |
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