The use of active packaging technologies and biopolymeric materials are among the emerging trends for implementation of sustainability in the food packaging industry. Thus, herein, bioactive transparent nanocomposite films of thermoplastic starch (TPS) reinforced with bacterial nanocellulose (BNC) (1%, 5% and 10% w/w, relative to starch) and enriched with gallic acid (GA) (1 and 1.5% w/w, relative to starch) were prepared by the solvent casting method. The addition of BNC (≥5% w/w) and GA (1 and 1.5% w/w) enhanced both the mechanical properties (Young's Modulus: 1.2–2.0 GPa vs. 1.0 GPa for TPS; tensile strength: 23–39 MPa vs. 20 MPa for TPS) and the water resistance (moisture absorption and solubility in water) of the nanocomposites. All films are thermally stable up to 125 °C. It was also found that the addition of GA imparted the hydrocolloid TPS-BNC nanocomposites with UV-blocking properties and antioxidant activity (DPPH scavenging activity above 80%). In addition, the film with 10% w/w of BNC nanofibers and 1% w/w of GA had good oxygen barrier properties with a coefficient of permeability of 0.91 ± 0.12 cm³ μm m⁻² d⁻¹ kPa⁻¹ and antibacterial activity against the gram-positive Staphylococcus aureus (reduction of about 4.5 log₁₀ colony forming units (CFU) mL⁻¹ after 48 h). This is the first time that antibacterial activity is reported for TPS-BNC nanocomposites. The film with 10% w/w of BNC nanofibers and 1% w/w of GA was further demonstrated to have the ability of delaying the browning and weight loss of packaged fresh cut apple stored at +4 °C for 7 days. All these outcomes are of great relevance for the packaging sector, thus attesting the potential of the developed TPS-BNC-GA nanocomposites as sustainable and eco-friendly film materials for active food packaging.

活性包装技术和生物聚合材料的使用是食品包装行业实现可持续发展的新兴趋势之一。因此，本文中，用细菌纳米纤维素（BNC）（相对于淀粉为1％、5％和10％w/w）增强并富含没食子酸（GA）（1和1.5）的热塑性淀粉（TPS）的生物活性透明纳米复合材料薄膜％w/w，相对于淀粉）通过溶剂浇铸法制备。添加 BNC（≥5% w/w）和 GA（1 和 1.5% w/w）增强了机械性能（杨氏模量：1.2–2.0 GPa，TPS 为 1.0 GPa；拉伸强度：23–39 MPa对比 TPS 的 20 MPa）和纳米复合材料的耐水性（吸湿性和水中溶解度）。所有薄膜在高达 125 °C 的温度下均具有热稳定性。研究还发现，GA的添加赋予了水胶体TPS-BNC纳米复合材料具有阻挡紫外线的性能和抗氧化活性（DPPH清除活性在80%以上）。此外，含有10% w/w BNC纳米纤维和1% w/w GA的薄膜具有良好的氧气阻隔性能，渗透系数为0.91 ± 0.12 cm³ μm m ^-2  d ^-1  kPa ^-1和对革兰氏阳性金黄色葡萄球菌的抗菌活性（48小时后减少约4.5 log ₁₀菌落形成单位（CFU）mL ^-1）。这是首次报道 TPS-BNC 纳米复合材料的抗菌活性。进一步证明含有10% w/w BNC纳米纤维和1% w/w GA的薄膜具有延缓包装鲜切苹果在+4℃储存7天的褐变和失重的能力。所有这些结果都与包装行业密切相关，从而证明了所开发的 TPS-BNC-GA 纳米复合材料作为活性食品包装可持续且环保的薄膜材料的潜力。