Teuku Rihayat, Agung Efriyo Hadi, Nurhanifa Aidy, Aida Safitri, Januar Parlaungan Siregar, Tezara Cionita, Agustinus Purna Irawan, Mohammad Hazim Mohamad Hamdan, Deni Fajar Fitriyana
This study aims to produce and investigate the potential of biodegradable Polylactic Acid (PLA)-based composites mixed with chitosan and Turmeric Essential Oil (TEO) as an anti-microbial biomaterial. PLA has good barrier properties for moisture, so it is suitable for use as a raw material for making packaging and is included in the GRAS (Generally Recognized As Safe). Chitosan is a non-toxic and antibacterial cationic polysaccharide that needs to be improved in its ability to fight microbes. TEO must be added to increase antibacterial properties due to a large number of hydroxyl (-OH) and carbonyl functional groups. The samples were prepared in three different variations: 2 g of chitosan, 0 mL TEO and 0 mL glycerol (Biofilm 1), 3 g of chitosan, 0.3 mL TEO and 0.5 mL of glycerol (Biofilm 2), and 4 g of chitosan, 0.3 of TEO and 0.5 mL of glycerol (Biofilm 3). The final product was characterized by its functional group through Fourier transform infrared (FTIR); the functional groups contained by the addition of TEO are C-H, C=O, O-H, and N-H with the extraction method, and as indicated by the emergence of a wide band at 3503 cm−1, turmeric essential oil interacts with the polymer matrix by creating intermolecular hydrogen bonds between their terminal hydroxyl group and the carbonyl groups of the ester moieties of both PLA and Chitosan. Thermogravimetric analysis (TGA) of PLA as biofilms, the maximum temperature of a biofilm was observed at 315.74◦ C in the variation of 4 g chitosan, 0.3 mL TEO, and 0.5 mL glycerol (Biofilm 3). Morphological conditions analyzed under scanning electron microscopy (SEM) showed that the addition of TEO inside the chitosan interlayer bound chitosan molecules to produce solid particles. Chitosan and TEO showed increased anti-bacterial activity in the anti-microbial test. Furthermore, after 12 days of exposure to open areas, the biofilms generated were able to resist S. aureus and E. coli bacteria. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.
Department of Chemical Engineering, Politeknik Negeri Lhokseumawe, Lhokseumawe, 24301, Indonesia; Mechanical Engineering Department, Faculty of Engineering, Universitas Malahayati, Bandar Lampung, 35153, Indonesia; Department of Renewable Energy Engineering, Universitas Malikussaleh, Muara Batu, 24355, Indonesia; Department of Chemical Engineering, Faculty of Engineering, Universitas Sumatera Utara, Kota Medan, 20222, Indonesia; College of Engineering, Universiti Malaysia Pahang, Gambang, 26300, Malaysia; Department of Mechanical Engineering, Faculty of Engineering and Quantity Surveying, INTI International University, Seremban, 71800, Malaysia; Faculty of Engineering, Universitas Tarumanagara, Jakarta Barat, 11440, Indonesia; Faculty of Engineering and Computing, First City University College, Petaling Jaya, 47600, Malaysia; Department of Mechanical Engineering, Universitas Negeri Semarang, Semarang, 50229, Indonesia
