Physical, Barrier, Mechanical, and Biodegradability Properties of Modified Starch Films with Nut By-Products Extracts.

Marcos Leon-Bejarano,Senay Simsek,Maribel Ovando-Martínez,Yusuf Durmus

doi:10.3390/foods9020226

Marcos Leon-Bejarano, Senay Simsek + Show 2 more

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https://doi.org/10.3390/foods9020226

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Abstract

Starch-based films with phenolic extracts could replace the use of petroleum-based plastics. In this study, octenyl succinate starch (OSS) films with pecan nutshell extract (PSE) or hazelnut skin extract (HSE) were prepared. The water resistance, as well as the optical, physical, mechanical, and biodegradable properties of these films, were investigated. The PSE and HSE improved the water resistance (decreasing the solubility to 17% and increasing the contact angle to 96.80°) and UV-light barrier properties of the films. For PSE and HSE, as their concentrations increased, the film rigidity decreased since these extracts acted as plasticizers. Micrographs obtained by scanning electron microscopy (SEM) depicted a homogeneous surface as a result of extracts dispersion through the polymeric matrix and the interactions between the phenolic compounds (PC) of the extracts and the OSS. The phenolic extracts from nut by-products and octenyl succinic anhydride (OSA) starch could be used to develop films to replace the conventional plastics.

Highlights

Native and modified starch has become a potential alternative for petroleum-based plastics to mitigate the environmental problems associated with these materials [1]
That agrees with the reported by de la Rosa, et al [37] in pecan nutshells (30%–40%) and Taş and Gökmen [38] (60%) in hazelnut skins
These results indicated that both nut by-products were a potential source of phenolic compounds (PC), and the extraction method used was suitable to obtain them

Summary

Introduction

Native and modified starch has become a potential alternative for petroleum-based plastics to mitigate the environmental problems associated with these materials [1]. In this context, the food industry has been looking to use starch-based materials for the production of films that act as packaging materials or as edible coatings, thereby ensuring the quality of foods [2,3]. Most of the materials mentioned above are produced with native starch. The characteristics of native starch can be greatly improved by chemical modification, giving it greater value and expanding the field of application [5,6]. Chemical modification with octenyl succinic anhydride (OSA) (Figure 1) is one of the main modifications used in the food industry because of the emulsifying properties that octenyl succinate starch (OSS) presents [7]

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