Browsing by Author "Franco Araujo, Robert Felipe"
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Item Estudios mecánicos y microbiológicos de películas de almidón de yuca funcionalizadas con óxido de zinc y piperina(Universidad Santiago de Cali, 2022) Polindara Ospina, Gustavo Adolfo; Franco Araujo, Robert Felipe; Castro Narváez, Sandra Patricia (Directora); Caicedo Cano, Carolina (Directora)In recent decades, there has been a growing interest in replacing petroleum-based plastic packaging materials with biodegradable materials. Thermoplastic starch has emerged as a low cost and low environmental impact alternative. This study reports mechanical and microbiological properties of biodegradable films of cassava starch and glycerol as plasticizer, manufactured by casting method and functionalized with polyvinyl alcohol (PVOH), zinc oxide and piperine extract. All the films show a thickness variation of 119.9 ±1.1µm and high transparency higher than 90%, which decreases with the amount of ZnO reaching 75%. The Fourier transform infrared (FTIR) and Raman spectra show bands characteristic of starch, PVOH and ZnO, as well as displacement of the bands associated with hydrogen bridge intermolecular forces between the starch polymer, PVOH copolymer and ZnO. Calorimetric analyses (TGA and DSC) show a reduction in mass loss of 128% and tensile strength establishes that ZnO functionalized films are more stable and with better mechanical performance (10.83 MPa). The starch functionalized films show lower adherences to Escherichia Coli, Salmonella Aureus, the fungus Aspergillus Niger and the yeast Candida Albicans compared to the non-functionalized films. The obtained results together with the cost analysis allow the development of films for the manufacture of flexible packaging that do not require subsequent treatments for printing and lamination because they present surface energies higher than 40 mN/m.