Chaudhary Savita, Kour Manmeet, Kumar Rajeev
Department of Chemistry and Centre of Advanced Studies in Chemistry, Panjab University, Chandigarh 160014, India.
Department of Chemistry and Centre of Advanced Studies in Chemistry, Panjab University, Chandigarh 160014, India; Department of Environment Studies, Panjab University, Chandigarh 160014, India.
Int J Biol Macromol. 2024 Nov;281(Pt 1):136218. doi: 10.1016/j.ijbiomac.2024.136218. Epub 2024 Oct 1.
The over usage plastics have possessed serious threat to the ecological system. Thus progressive advancement in fabricating biodegradable and renewable bioplastics is persuasively required to furnish an effective alternative to non-biodegradable plastics. In this view, the current work highlights the production of starch based bioplastic films using waste Colocasia esculenta (taro herb) as a viable starting precursor. The functional ability of developed taro starch based film was further modified by incorporating carbon dots (CQDs) fillers generated from the waste slurry produced during starch extraction from taro herbs. The optimization of films production was achieved by varying the CQDs amount (0.4 %, 0.8 %, 2 % and 4 % w/w) on taro-based films using casting technology. The data illustrates that the addition of CQDs has the ability to enhance the fluorescence property, mechanical properties (Tensile Strength 0.332-4.635 MPa, Elongation at break 42.45-547.63 %) and water resistance ability of films (Moisture content 15-6.4 %, Water Solubility 50-30 % Water Vapour Transmission Rate 2.0012-1.0054 g h and Water Contact Angle 40.6-89.6°). The developed films are found to be thermally stable. The formed films possessed anti-oxidative abilities which safeguard the film from oxidative attacks and ultimately protect the film from the external environment. The fluorescence nanosensor probe has further been developed by utilizing CQDs embedded in a starch-based bioplastic nanocomposite. The developed sensor displayed selective sensing ability towards Fe ion with high sensitivity and accuracy in aqueous medium. Thus, the proposed sensor in this work offers a portable, efficient, low-cost, disposable, non-lethal, and eco-friendly nanosensor for on-site monitoring of metal ion for the food, beverage, and pharmaceutical industries. This is one of the primary reports where metal ions sensing is reported for Taro@CQDs nanocomposites based films. Our outcomes of this work hold significant relevance to providing a smart sensory and biodegradable probe for metal ion sensing by using waste resources, thus offering a better and sustainable alternative for environmental remediation applications.
塑料的过度使用已对生态系统构成严重威胁。因此，迫切需要在制造可生物降解和可再生生物塑料方面取得进展，以提供一种有效的替代不可生物降解塑料的材料。鉴于此，当前的工作重点是利用废弃的芋（芋头）作为可行的起始前体来生产淀粉基生物塑料薄膜。通过掺入从芋头草本植物淀粉提取过程中产生的废浆液中生成的碳点（CQDs）填料，进一步改善了所开发的芋头淀粉基薄膜的功能特性。使用流延技术，通过改变芋头基薄膜上CQDs的含量（0.4%、0.8%、2%和4% w/w）实现了薄膜生产的优化。数据表明，添加CQDs能够增强薄膜的荧光性能、机械性能（拉伸强度0.332 - 4.635 MPa，断裂伸长率42.45 - 547.63%）和耐水性（水分含量15 - 6.4%，水溶性50 - 30%，水蒸气透过率2.0012 - 1.0054 g/h，水接触角40.6 - 89.6°）。所开发的薄膜具有热稳定性。形成的薄膜具有抗氧化能力，可保护薄膜免受氧化攻击，并最终保护薄膜免受外部环境影响。通过利用嵌入淀粉基生物塑料纳米复合材料中的CQDs，进一步开发了荧光纳米传感器探针。所开发的传感器在水介质中对铁离子显示出选择性传感能力，具有高灵敏度和准确性。因此，本工作中提出的传感器为食品、饮料和制药行业的金属离子现场监测提供了一种便携式、高效、低成本、一次性、无致死性且环保的纳米传感器。这是关于基于芋头@CQDs纳米复合材料薄膜进行金属离子传感的主要报道之一。我们这项工作的成果对于利用废弃资源提供一种用于金属离子传感的智能传感且可生物降解的探针具有重要意义，从而为环境修复应用提供了一种更好且可持续的替代方案。
