High gas barrier coating using non-toxic nanosheet dispersions for flexible food packaging film

Abstract

One of the major challenges in the circular economy relating to food packaging is the elimination of metallised film which is currently the industry standard approach to achieve the necessary gas barrier performance. Here, we report the synthesis of high aspect ratio 2D non-toxic layered double hydroxide (LDH) nanosheet dispersions using a non-toxic exfoliation method in aqueous amino acid solution. High O 2 and water vapour barrier coating films can be prepared using food safe liquid dispersions through a bar coating process. The oxygen transmission rate (OTR) of 12 μm PET coated film can be reduced from 133.5 cc·m −2 ·day −1 to below the instrument detection limit (<0.005 cc·m −2 ·day −1 ). The water vapour transmission rate (WVTR) of the PET film can be reduced from 8.99 g·m −2 ·day −1 to 0.04 g·m −2 ·day −1 after coating. Most importantly, these coated films are also transparent and mechanically robust, making them suitable for flexible food packing while also offering new recycling opportunities.

Evolution of biobased and nanotechnology packaging – a review

“…The first was termed hydrotalcite, it was found in a Norwegian geological specimen. The LDH's aspire to replace aluminium packaging to enter the area of high barrier food packaging (Yu et al 2019). The synthesis of LDH nanosheets is, however, extremely demanding because the very high in-plane charge density need to be over-comed requiring demanding exfoliation procedures, but has created orders of decreased oxygen and water vapor transmission rates.…”

Lignin Redistribution for Enhancing Barrier Properties of Cellulose-Based Materials

“…Food packaging needs to provide containment and protection for food products during distribution and storage in external and internal unfavorable conditions. Such protection prolongs the shelf life of food products, and meanwhile maintains the optimal quality and safety of the products [1][2][3]. Cellulose-based food packaging material has attracted much attention as a biodegradable and sustainable product compared to petroleum-based plastic [4,5].…”

Justification of selection of packaging material and packing method for preservation of vitamin-mineral concentrate quality

“…Несмотря на ряд преимуществ, в числе которых способность улучшать качество пищевых продуктов и выступать в качестве эффективного носителя для введения различных добавок, включая антимикробные препараты, антиоксиданты, красители и другие питательные вещества, высокие газобарьерные свойства и желаемая плёнкообразующая способность (например, для биополимеров на основе изолята сывороточного белка), биоплимеры обладают и недостатками, среди которых низкие влагобарьерные свойства [3,4]. Повышение влагобарьерных свойств и прочности структуры достигается за счёт внесения наночастиц зеина, целлюлозы и других [5,6].…”