Department of Biotechnology, College of Life Sciences and Biotechnology, Korea University, Seoul 02841, Republic of Korea.
Department of Biotechnology, College of Life Sciences and Biotechnology, Korea University, Seoul 02841, Republic of Korea; Department of Food Bioscience and Technology, College of Life Sciences and Biotechnology, Korea University, Seoul 02841, Republic of Korea.
Carbohydr Polym. 2024 Nov 1;343:122502. doi: 10.1016/j.carbpol.2024.122502. Epub 2024 Jul 19.
In this study, carbon nanodot (CD)-corn starch (CS) nanocomposite films are fabricated for active food packaging applications. First, ginkgo biloba leaves (GBL) were used as a biomass-derived carbon precursor, and a facile hydrothermal method was employed to synthesise environmentally sustainable CDs. The GBL-derived carbon nanodots (gCDs) were then characterised and incorporated into a CS matrix via an extrusion process to fabricate the CS/gCD nanocomposite film. The effects of various gCD concentrations on the physicochemical and functional properties of CS/gCD composite films were systematically investigated. The gCD exhibited non-cytotoxic effect against human colorectal adenocarcinoma cell line (Caco-2) cells when exposed up to 1000 μg/mL. The incorporation of gCDs into the CS film improved its mechanical properties, with the toughness of the CS/gCD nanocomposite film exhibiting 198 % superiority compared to the CS film. In addition, the oxygen barrier and UV-blocking properties were significantly improved. Furthermore, the CS/gCD nanocomposite film significantly extended the shelf life of ω-3 oils owing to the superior antioxidant activity of the gCDs, exhibiting only 9 meq/kg during the 15-day storage period. Our results suggest that the developed CS/gCD active composite film is a promising candidate for environmentally sustainable solutions to enhance food shelf life and reduce food waste.
在这项研究中，制备了碳纳米点（CD）-玉米淀粉（CS）纳米复合材料薄膜，用于活性食品包装应用。首先，使用银杏叶（GBL）作为生物量衍生的碳前体，采用简便的水热法合成环保可持续的 CDs。然后对 GBL 衍生的碳纳米点（gCDs）进行了表征，并通过挤出工艺将其掺入 CS 基质中，以制备 CS/gCD 纳米复合材料薄膜。系统研究了不同 gCD 浓度对 CS/gCD 复合薄膜的物理化学和功能性质的影响。当暴露于高达 1000μg/mL 时，gCD 对人结肠直肠腺癌细胞系（Caco-2）细胞表现出非细胞毒性作用。gCDs 的掺入提高了 CS 膜的机械性能，CS/gCD 纳米复合材料膜的韧性比 CS 膜提高了 198%。此外，氧气阻隔和紫外线阻挡性能得到了显著改善。此外，由于 gCDs 的优越抗氧化活性，CS/gCD 纳米复合薄膜显著延长了 ω-3 油的保质期，在 15 天的储存期内仅产生 9meq/kg 的酸败。我们的结果表明，开发的 CS/gCD 活性复合膜是一种很有前途的环保可持续解决方案，可用于延长食品保质期和减少食物浪费。
