Lafraya Alvaro, Prieto Cristina, Pardo-Figuerez Maria, Chiva Alberto, Lagaron Jose M
Novel Materials and Nanotechnology Group, Institute of Agrochemistry and Food Technology (IATA), Spanish Council for Scientific Research (CSIC), Calle Catedrático Agustín Escardino Benlloch 7, 46980 Paterna, Spain.
Bioinicia R&D Department, Bioinicia S.L., Calle Algepser 65, nave 3, 46980 Paterna, Spain.
Nanomaterials (Basel). 2021 Dec 10;11(12):3354. doi: 10.3390/nano11123354.
In the current work, a super-repellent biopaper suitable for food contact applications was developed. To do this, three different kinds of biopolymers, namely polylactide (PLA), poly(ε-caprolactone) (PCL), poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV), and hydrophobic silica microparticles (SiO), were sequentially processed by electrohydrodynamic processing (EDHP). As a first step, the ultrathin biopolymer fibers were deposited onto a commercial food contact cellulose paper by electrospinning and, thereafter, the nanostructured silica was sequentially electrosprayed. The multilayer coated papers were annealed at different temperatures to promote adhesion between the layers and enhance the super-repellent properties. The developed coatings were characterized in terms of morphology, permeance to water vapor, adhesion, mechanical resistance, and contact and sliding angle. The resultant multilayer biopapers presented a hierarchical micro/nanostructured surface with an apparent water contact angle (WCA) higher than 155° and sliding angle (SA) lower than 10° for all the tested biopolymers used. Among the different multilayer approaches, it was observed that the paper/PHBV/SiO showed the best performance, in terms of water vapor permeance; resistance after the tape peeling-off test; and food super-repelling properties to water, yogurt, and custard. Overall, this study presents the successful generation of super-repellent biopapers coated with PLA, PCL, or PHBV along with hydrophobic silica microparticles and its effectiveness for easy emptying food packaging applications to reduce food waste.
在当前工作中，开发了一种适用于食品接触应用的超疏水性生物纸。为此，通过电液动力学处理（EDHP）依次处理了三种不同的生物聚合物，即聚乳酸（PLA）、聚（ε-己内酯）（PCL）、聚（3-羟基丁酸酯-co-3-羟基戊酸酯）（PHBV）和疏水性二氧化硅微粒（SiO）。第一步，通过静电纺丝将超薄生物聚合物纤维沉积在商用食品接触纤维素纸上，然后依次对纳米结构二氧化硅进行电喷雾。对多层涂层纸在不同温度下进行退火处理，以促进各层之间的粘附并增强超疏水性。对所开发的涂层进行了形态、水蒸气渗透性、粘附性、机械抗性以及接触角和滑动角等方面的表征。对于所有测试的生物聚合物，所得多层生物纸呈现出具有分级微/纳米结构的表面，其表观水接触角（WCA）高于155°，滑动角（SA）低于10°。在不同的多层方法中，观察到纸/PHBV/SiO在水蒸气渗透性、胶带剥离试验后的抗性以及对水、酸奶和蛋奶冻的食品超排斥性能方面表现最佳。总体而言，本研究成功制备了涂覆有PLA、PCL或PHBV以及疏水性二氧化硅微粒的超疏水性生物纸，并证明了其在易于排空食品包装应用以减少食物浪费方面的有效性。
