Rizal Samsul, Abdul Khalil H P S, Hamid Shazlina Abd, Ikramullah Ikramullah, Kurniawan Rudi, Hazwan Che Mohamad, Muksin Umar, Aprilia Sri, Alfatah Tata
Department of Mechanical Engineering, Universitas Syiah Kuala, Banda Aceh 23111, Indonesia.
Bioresource Technology Division, School of Industrial Technology, Universiti Sains Malaysia, Penang 11800, Malaysia.
Polymers (Basel). 2023 Jan 10;15(2):365. doi: 10.3390/polym15020365.
Plastic pollution has raised interest in biodegradable and sustainable plastic alternatives. For edible food packaging, seaweed biopolymers have been studied for their film-forming properties. In this study, packaging films were developed using the solvent casting technique from natural red seaweed () and coffee waste product. The physico-chemical and thermal properties of seaweed/coffee biopolymer films was obtained using dynamic light scattering (DLS), scanning electron microscopy (SEM), Fourier transmission irradiation (FT-IR), water contact angle measurement (WCA) and thermogravimetric analysis (TGA). The characterization study was carried out to improve the film's morphological, thermal, and mechanical properties. The average particle size of coffee waste was found to be between 1.106 and 1.281 µm, with a zeta potential value of -27.0 mV indicating the compound's strong negative charge. The SEM analysis revealed that the coffee filler was evenly dispersed in the polymer matrix, improving the film's structural properties. The FT-IR result shows that coffee waste was successfully incorporated over the film matrix with the presence of a N-H bond. The hydrophobic property of the film was enhanced with the incorporation of coffee filler, indicating increased water contact angle compared to the neat film. The tensile properties of the biopolymer film were significantly improved at 4 wt% coffee powder with optimum tensile strength (35.47 MPa) with the addition of coffee waste powder. The incorporation of coffee waste into the seaweed matrix increased the functional properties of the fabricated biopolymer film. Thus, seaweed/coffee biopolymer film has the potential to be used in food packaging and other applications.
塑料污染引发了人们对可生物降解和可持续塑料替代品的兴趣。对于可食用食品包装，人们已对海藻生物聚合物的成膜特性进行了研究。在本研究中，采用溶剂浇铸技术，以天然红海藻（）和咖啡废料为原料制备了包装薄膜。利用动态光散射（DLS）、扫描电子显微镜（SEM）、傅里叶透射红外光谱（FT-IR）、水接触角测量（WCA）和热重分析（TGA）对海藻/咖啡生物聚合物薄膜的物理化学和热性能进行了测定。开展表征研究以改善薄膜的形态、热性能和机械性能。发现咖啡废料的平均粒径在1.106至1.281 µm之间，ζ电位值为-27.0 mV，表明该化合物带有很强的负电荷。SEM分析表明，咖啡填料均匀分散在聚合物基体中，改善了薄膜的结构性能。FT-IR结果表明，咖啡废料通过N-H键的存在成功地掺入了薄膜基体中。咖啡填料的加入增强了薄膜的疏水性，表明与纯薄膜相比水接触角增大。在添加4 wt%咖啡粉时，生物聚合物薄膜的拉伸性能得到显著改善，拉伸强度达到最佳值（35.47 MPa）。将咖啡废料掺入海藻基体中提高了所制备生物聚合物薄膜的功能性能。因此，海藻/咖啡生物聚合物薄膜具有用于食品包装及其他应用的潜力。
