D Pal Manisha, Chawla Ruchi, Dutta Pradip Kumar
Polymer Research Laboratory, Department of Chemistry, Motilal Nehru National Institute of Technology Allahabad, Prayagraj 211004, Uttar Pradesh, India.
Polymer Research Laboratory, Department of Chemistry, Motilal Nehru National Institute of Technology Allahabad, Prayagraj 211004, Uttar Pradesh, India.
Int J Biol Macromol. 2024 Dec;282(Pt 1):136816. doi: 10.1016/j.ijbiomac.2024.136816. Epub 2024 Oct 22.
Chitosan (Cs) being a natural biopolymer serves as an excellent template to construct active packaging materials for achieving sustainable development. In this study, Cs was chemically modified via epoxide ring opening click reaction using vinyl epoxide to obtain a novel chitosan vinyl epoxide (Cs-VE) derivative with hydroxyl and olefinic functional groups. The Cs-VE transparent film was fabricated through the eco-friendly solution casting technique. A meticulous investigation into the chemical structure and physicochemical properties of the synthesized films was conducted using FT-IR, H NMR and XRD analyses. The thermal stability and homogeneity of the film were verified by thermogram and FE-SEM images respectively. Improved mechanical properties (tensile strength of 24.64 MPa and 12.08 % elongation at break) and excellent UV-light blocking ability (9.3 % transmittance at 350 nm and 22.15 % transparency at 600 nm) were observed. Also, important parameters such as water vapor permeability (WVP), swelling degree, water solubility and UV-barrier properties were found to be adequate for food packaging application. Similarly, enhanced antioxidant activity with 27.2 % and 73.6 % radical scavenging against DPPH and ABTS radicals respectively was observed for the synthesized Cs-VE film. The film showed antimicrobial activity against both bacteria and fungi. These results along with food packaging studies on Grewia asiatica fruit established the developed Cs-VE film as a suitable candidate for active food packaging application.
壳聚糖（Cs）作为一种天然生物聚合物，是构建活性包装材料以实现可持续发展的优良模板。在本研究中，通过使用环氧乙烯进行环氧开环点击反应对壳聚糖进行化学改性，以获得具有羟基和烯属官能团的新型壳聚糖环氧乙烯（Cs-VE）衍生物。通过环保的溶液浇铸技术制备了Cs-VE透明薄膜。使用傅里叶变换红外光谱（FT-IR）、核磁共振氢谱（H NMR）和X射线衍射（XRD）分析对合成薄膜的化学结构和物理化学性质进行了细致研究。分别通过热重曲线和场发射扫描电子显微镜（FE-SEM）图像验证了薄膜的热稳定性和均匀性。观察到其机械性能得到改善（拉伸强度为24.64MPa，断裂伸长率为12.08%），并且具有出色的紫外线阻隔能力（在350nm处透过率为9.3%，在600nm处透明度为22.15%）。此外，发现诸如水蒸气透过率（WVP）、溶胀度、水溶性和紫外线阻隔性能等重要参数适用于食品包装应用。同样，合成的Cs-VE薄膜对二苯基苦味酰基自由基（DPPH）和2,2'-联氮-双-3-乙基苯并噻唑啉-6-磺酸自由基（ABTS）的自由基清除率分别提高了27.2%和73.6%，表现出增强的抗氧化活性。该薄膜对细菌和真菌均显示出抗菌活性。这些结果以及对亚洲格木果实的食品包装研究表明，所开发的Cs-VE薄膜是活性食品包装应用的合适候选材料。
