Instituto de Agroquímica y Tecnología de Alimentos, CSIC, Avda. Agustín Escardino 7, 46980 Paterna, Valencia, Spain.
Int J Food Microbiol. 2012 Aug 17;158(2):113-9. doi: 10.1016/j.ijfoodmicro.2012.07.004. Epub 2012 Jul 13.
Cellulose/copper composites with antifungal properties have been synthesized by physical/chemical methods. Physical treatments by heat or by a combination of heat and UV radiation provided composites with metallic copper and excellent interfacial adhesion; in contrast, chemical reduction with borohydride generated small although partially aggregated copper oxide nanoparticles. Copper micro/nano-particles and copper ions (Cu(2+)) were released from the cellulose matrix at an adequate rate to achieve a strong antimicrobial activity against Saccharomyces cerevisiae in in vitro experiments. Moreover, the copper oxide composites showed an excellent antifungal activity in pineapple and melon juice, reducing about 4 log cycles the loads of spoilage-related yeasts and moulds. The metallic copper composites reduced in 4 log cycles the load of yeasts and moulds in pineapple juice, although their antifungal activity was weaker in contact with melon juice. Copper loaded absorbent materials could be selectively implemented during the shelf-life of minimally processed fruits to reduce the number of spoilage-related microorganisms in the drip.
通过物理/化学方法合成了具有抗真菌性能的纤维素/铜复合材料。通过热或热和紫外辐射的组合进行物理处理，提供了具有金属铜和优异界面附着力的复合材料；相比之下，用硼氢化钠进行化学还原生成了虽然部分聚集但较小的氧化铜纳米颗粒。铜微/纳米颗粒和铜离子（Cu(2+)）从纤维素基质中以适当的速率释放出来，以在体外实验中对酿酒酵母实现强大的抗菌活性。此外，氧化铜复合材料在菠萝和瓜汁中表现出优异的抗真菌活性，减少了约 4 个对数周期的与变质相关的酵母和霉菌负荷。金属铜复合材料在 4 个对数周期内减少了菠萝汁中酵母和霉菌的负荷，尽管它们在与瓜汁接触时的抗真菌活性较弱。负载铜的吸收材料可以在最小加工水果的保质期内选择性地实施，以减少滴液中与变质相关的微生物数量。
