食品包装用ZnO纳米抗菌淀粉生物膜的研制
Developing ZnO Nanoparticle embedded Antimicrobial Starch Biofilm for Food Packaging
摘要：
淀粉基生物膜作为可生物降解的包装材料，可替代合成聚合物，用于涂覆和包装食品。纳米颗粒（NPs）也是抗生素的替代品，可以靶向病原体。通过纳米颗粒与食品包装材料的相互作用，包装食品的整体质量也得到了提高。本研究制备了ZnO纳米粒子包埋玉米淀粉薄膜。首先，采用溶胶-凝胶法和绿色合成法制备了ZnO纳米粒子，并制备了ZnO纳米粒子包埋玉米淀粉生物膜。采用溶胶-凝胶法在pH值为8 ~ 11的条件下合成了ZnO纳米粒子，其平均晶粒尺寸为28 ~ 53 nm。在绿色合成技术中，以印楝为原料，分别以2%和3%的浓度合成了平均粒径分别为36 nm和32 nm的ZnO纳米粒子。采用XRD、UV-DRS、UV-VIS、FTIR和FE-SEM对合成的ZnO纳米粒子进行了表征。添加5%柠檬酸溶液（w/w）作为交联剂，0.90g甘油（w/w）作为增塑剂，可提高ZnO包埋淀粉膜的功能性能。包埋有化学合成的ZnO NP的膜-F1、包埋有生物化学合成的ZnO NP的膜-F2和未被任何NP包埋的膜-F3。用SEM和XRD对薄膜进行了表征。F2膜液对大肠杆菌和金黄色葡萄球菌的抑菌圈分别为14 mm和6 mm，抑菌效果优于F1。与此同时，他们目前的应用和未来的前景，在食品部门也进行了探讨
英文摘要：
Starch based bio-films act as biodegradable packaging material for coating and wrapping food products, which is alternate to the synthetic polymer. Nanoparticles (NPs) are also alternative to antibiotics to target pathogens. Through interaction of nanoparticles with food packaging material the overall quality of the packaged food also get enhanced. In this research work, ZnO NP embedded corn starch films were developed. First, ZnO NP were synthesized by two approaches (a) Sol-gel approach and (b) Green synthesis approach; and then ZnO NP embedded corn-starch bio-films were developed. In sol-gel technique ZnO NP were synthesized at different pH ranging from 8 to 11, with an average crystallite size of 28 to 53 nm. In green synthesis technique ZnO NP were synthesized by using Azadirachta indica (Neem) at different concentration of 2\% and 3\% with an average crystallite size of 36 nm and 32 nm, respectively. Characterization of synthesized ZnO NPs were done with XRD, UV-DRS, UV-VIS, FTIR and FE-SEM. The functional properties of the ZnO embedded starch film were enhanced with addition of 5\% citric acid solution(w/w) as cross-linker and 0.90 g glycerol(w/w) as plasticizer. Film-F1 embedded with chemically synthesized ZnO NP, Film-F2 embedded with biochemcially synthesized ZnO NP and Film-F3 without being embedded by any NPs. Characterization of synthesized films were done with SEM and XRD. Film solution of F2 showed higher antimicrobial effectiveness than F1; against E.coli and S.aureus bacterial strains with an inhibition zone of 14 mm and 6 mm. 7days biodegradability analysis of the films were also done. Along with this, their current application and future perspectives in the food sector are also explored
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