Naitzel Thaís de Cássia, Garcia Vitor Augusto Dos Santos, Lourenço Carla Alves Monaco, Vanin Fernanda Maria, Yoshida Cristiana Maria Pedroso, Carvalho Rosemary Aparecida de
Faculty of Animal Science and Food Engineering, USP-University of São Paulo, Street Duque de Caxias Norte 225, Pirassununga 13635-900, Brazil.
Faculty of Agricultural Sciences, UNESP-São Paulo State University, Street José Barbosa de Barros 1780, Botucatu 19082-080, Brazil.
Foods. 2023 Jul 19;12(14):2745. doi: 10.3390/foods12142745.
Paper is one of the packaging materials that presents a biodegradable character, being used in several areas; however, its barrier properties (gases and fat) and mechanics are reduced, which limits its application. Coating papers with synthetic polymers improve these properties, reducing their biodegradability and recyclability. The objective of this work was to develop and characterize coated paperboard, using the tape casting technique, with different ratios of film form agar-agar/chitosan (AA:CHI, 100:0, 50:50, and 0:100) and different numbers of coating layers (operating times for application of 14.25 min and 28.5 min for one and two layers, respectively). A significant reduction in water absorption capacity was found by applying a 0:100 coating (approximately 15%). Considering all coating formulations, the water vapor permeability reduced by 10 to 60% compared to uncoated paperboard, except for two layers coated with 0:100. The tensile index (independent of AA:CHI) was higher in the machine direction (22.59 to 24.99 MPa) than in the cross-section (11.87-13.01 MPa). Paperboard coated only with chitosan showed superior properties compared to the other formulation coatings evaluated.
纸张是具有生物可降解特性的包装材料之一，被应用于多个领域；然而，其阻隔性能（气体和油脂）及机械性能有所降低，这限制了其应用。用合成聚合物对纸张进行涂层处理可改善这些性能，但会降低其生物降解性和可回收性。本研究的目的是采用流延铸膜技术，开发并表征具有不同琼脂/壳聚糖（AA:CHI）比例（100:0、50:50和0:100）以及不同涂层层数（一层和两层的涂覆操作时间分别为14.25分钟和28.5分钟）的涂层纸板。通过涂覆0:100的涂层，发现吸水能力显著降低（约15%）。考虑所有涂层配方，与未涂层纸板相比，除了涂覆0:100的两层纸板外，水蒸气透过率降低了10%至60%。纵向（22.59至24.99兆帕）的拉伸指数（与AA:CHI无关）高于横向（11.87 - 13.01兆帕）。与所评估的其他配方涂层相比，仅用壳聚糖涂层的纸板表现出更优异的性能。
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