Srisang, Siriwan

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Srisang, Siriwan
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siriwan.sr@kmitl.ac.th

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    Item type:Publication,
    Dip- and Spray-coating of Schanz pin with PLA and PLA nanosphere for prolonged antibacterial activity
    (2021-10-01)
    Chinavinijkul, Panarin
    ;
    Riansuwan, Kongkhet
    ;
    Kiratisin, Pattarachai
    ;
    Srisang, Siriwan
    ;
    Nasongkla, Norased
    In this study, variation of coating parameters was performed to determine a suitable condition for a vancomycin-coated Schanz pins in poly(lactic acid) (PLA) for prolonged antibacterial activity. Herein, the solvent used to dissolve the polymer (DCM vs. CHCl<inf>3</inf>), the concentration of the polymer in the solvent (2 vs. 5% w/v), the vertical withdrawing speed of the implant from the solution (0.4 vs. 2.4 cm/s), and the number of dip-coating cycles denoted in layers (1 L vs. 3 L) were investigated for its drug loading. Results showed that the optimal parameters were at 2% w/v PLA in DCM at 0.4 cm/s withdrawing speed and at 3 cycles for a high vancomycin loading with low deviation in result. Another experiment was performed by varying the concentration (1, 2, 4% w/v) and number of dip-coating cycles (10 L, 20 L, 30 L) which finalized 2% w/v PLA at 10 cycles as the optimal drug loading at 2.04 ± 0.09 mg. When observing the drug-release profile, the prior formulation released 2.21 ± 0.01 mg or 92.88 ± 0.44% of drug in one week. To reduce the amount of drug release in the first week, the method was further improved by spray-coating with PLA nanospheres (PLA-NS) for multiple cycles (10-, 20-, and 30-NS) to prolong drug release. After one, two, and three weeks, the drug-release were around 76%, 80%, and 88%, respectively. However, more drugs were lost as the number of cycles increases which suggests that lower (10-NS) coating cycle is better. Therefore, the final process was selected to be 2% PLA dip-coated for 10 cycles then spray-coated with PLA nanosphere for 10 cycles. Results showed that this method can help prolong release for at least 24 days. A short-term bacterial and cytotoxicity tests were done for 3 days with no S.aureus formed nor cytotoxicity. These results supported that the coating was successful in inhibiting the growth of S.aureus.