Effect of Free Volume on Curcumin Release from Various Polymer-Based Composite Films Analyzed Using Positron Annihilation Lifetime Spectroscopy.

Jong-Whan Rhim,Saygin Kuzeci,Swarup Roy,Cumali Tav,Necmettin Akti,Ugur Yahsi

doi:10.3390/ma14195679

Jong-Whan Rhim, Saygin Kuzeci + Show 4 more

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https://doi.org/10.3390/ma14195679

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Abstract

This work reports the effects of free volume on curcumin release in various polymer-based composite films. Curcumin-reinforced biocomposite films were fabricated with natural biopolymers (carrageenan and chitosan) and bioplastics (poly(lactide) (PLA) and poly (butylene adipate-co-terephthalate) (PBAT)) via the solvent casting method. The curcumin release test was performed using an aqueous medium, and it was found that it was released the fastest in the carrageenan film, followed by the chitosan, PLA, and PBAT films, presumably owing to the dissimilarity of the polymer matrix. The free volume of the polymer films was determined using positron annihilation lifetime spectroscopy (PALS) to understand the release phenomena of curcumin. The free volume fraction was varied and reliant on the type of polymer, with the highest in the PBAT-based film followed by the PLA-, chitosan-, and carrageenan-based films. The free volume method helps analyze the release of bioactive compounds in a polymer matrix and may help to achieve a better understanding of the release of bioactive compounds.

Highlights

In recent years, the manufacture of eco-friendly functional packaging films integrating numerous natural functional materials has garnered significant attention in the active packaging field [1,2]
Using the free volume measured as a result of positron annihilation lifetime spectroscopy (PALS), we tried to explain, for the first time, a phenomenon in which the release rate of curcumin varies depending on the film type
Using the free volume measured as a result of PALS, we tried to explain, for the first time, a phenomenon in which the release rate of curcumin varies6 of deexplain, for the first time, a phenomenon in which the release rate of curcumin varies depending on the film type

Summary

Introduction

The manufacture of eco-friendly functional packaging films integrating numerous natural functional materials has garnered significant attention in the active packaging field [1,2]. For the production of eco-friendly packaging films, natural biopolymers such as polysaccharides, proteins, blends, and various bioplastics such as PLA (poly(lactide)), PBAT (poly(butylene adipate-co-terephthalate)), and PHAs (polyhydroxyalkanoates) are combined with active functional materials, such as natural plant extracts and functional nanomaterials [1,3,4]. In this context, curcumin could be a good choice as a naturally produced bioactive functional material. It is known that the release of bioactive compounds from packaging films to food simulants depends on the polymer matrix [12]

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