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Coconut husk-lignin derived carbon dots incorporated carrageenan based functional film for intelligent food packaging
International Journal of Biological Macromolecules ( IF 7.7 ) Pub Date : 2024-03-24 , DOI: 10.1016/j.ijbiomac.2024.131005 U K Sangeetha 1 , Nandhana Sudhakaran 2 , P A Parvathy 1 , Malini Abraham 1 , Subrata Das 1 , Sriparna De 3 , Sushanta K Sahoo 1
International Journal of Biological Macromolecules ( IF 7.7 ) Pub Date : 2024-03-24 , DOI: 10.1016/j.ijbiomac.2024.131005 U K Sangeetha 1 , Nandhana Sudhakaran 2 , P A Parvathy 1 , Malini Abraham 1 , Subrata Das 1 , Sriparna De 3 , Sushanta K Sahoo 1
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Carbon dots (CDs) derived from sustainable natural feed-stocks like lignin have gained wide acceptance by virtue of their renewability and promising potential in intelligent sensing applications. The precursor lignin is isolated from agro-biomass waste, coconut husk through sodium hydroxide based extraction process. CDs are synthesised from amine functionalized lignin through solvothermal process and integrated into carrageenan biopolymer matrix (1, 2 and 3 wt%). The composite film with 2 wt% CDs (CARR2CD) showed optimum fluorescent emission intensity, excellent pH dependent fluorescent color change in the food pH range, reasonable tensile strength (46.50 ± 1.32 MPa) and 27 % increase in elongation at break. CDs imparted UV-light blocking properties (70 % UV-light) and enhanced hydrophobicity of the carrageenan matrix. CARR2CD film showed 84 % visible light transparency, 79 % reduction in oxygen transmittance rate (OTR), 81 % reduction in CO gas permeability and excellent antioxidant and antibacterial properties (against and ). As a practical application, the developed responsive packaging material is used to track pH change associated with milk spoilage via noticeable color change in fluorescent emission of the composite film. Thus, the developed responsive composite film paves a way for use as green and sustainable transparent intelligent food packaging material.
中文翻译：
用于智能食品包装的椰壳木质素衍生碳点掺入卡拉胶基功能膜
源自木质素等可持续天然原料的碳点（CD）凭借其可再生性和在智能传感应用中的巨大潜力而获得了广泛接受。通过基于氢氧化钠的提取工艺从农业生物质废物、椰子壳中分离出前体木质素。 CD 由胺功能化木质素通过溶剂热工艺合成，并整合到角叉菜胶生物聚合物基质中（1、2 和 3 wt%）。含有 2 wt% CD (CARR2CD) 的复合薄膜表现出最佳的荧光发射强度、食品 pH 范围内出色的 pH 依赖性荧光颜色变化、合理的拉伸强度 (46.50 ± 1.32 MPa) 和断裂伸长率增加 27%。 CD 赋予角叉菜胶基质紫外线阻挡性能（70% 紫外线）并增强疏水性。 CARR2CD薄膜表现出84％的可见光透明度，氧气透过率（OTR）降低79％，CO气体渗透性降低81％，以及优异的抗氧化和抗菌性能（针对和）。作为实际应用，所开发的响应性包装材料可通过复合薄膜荧光发射中明显的颜色变化来跟踪与牛奶腐败相关的 pH 值变化。因此，所开发的响应性复合薄膜为绿色可持续的透明智能食品包装材料铺平了道路。
更新日期：2024-03-24
中文翻译：
用于智能食品包装的椰壳木质素衍生碳点掺入卡拉胶基功能膜
源自木质素等可持续天然原料的碳点（CD）凭借其可再生性和在智能传感应用中的巨大潜力而获得了广泛接受。通过基于氢氧化钠的提取工艺从农业生物质废物、椰子壳中分离出前体木质素。 CD 由胺功能化木质素通过溶剂热工艺合成，并整合到角叉菜胶生物聚合物基质中（1、2 和 3 wt%）。含有 2 wt% CD (CARR2CD) 的复合薄膜表现出最佳的荧光发射强度、食品 pH 范围内出色的 pH 依赖性荧光颜色变化、合理的拉伸强度 (46.50 ± 1.32 MPa) 和断裂伸长率增加 27%。 CD 赋予角叉菜胶基质紫外线阻挡性能（70% 紫外线）并增强疏水性。 CARR2CD薄膜表现出84％的可见光透明度，氧气透过率（OTR）降低79％，CO气体渗透性降低81％，以及优异的抗氧化和抗菌性能（针对和）。作为实际应用，所开发的响应性包装材料可通过复合薄膜荧光发射中明显的颜色变化来跟踪与牛奶腐败相关的 pH 值变化。因此，所开发的响应性复合薄膜为绿色可持续的透明智能食品包装材料铺平了道路。
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