Biopolymer‐based sachets enriched with acorn shell extracts produced by ultrasound‐assisted extraction for active packaging

Abstract

Acorn shell residue is valorized for the efficient obtention of antioxidant extracts by ultrasound-assisted extraction and applied in the development of biopolymerbased films, studying its influence in different matrices for the subsequent preparation of emitting sachets for active food packaging. The effect of increasing extract addition on the physical, mechanical, optical, and antioxidant properties of biopolymer films is studied. It is observed that the water resistance increases with increasing amounts of extract in PVA films and from 5% extract in chitosan films. Furthermore, 3% extract in both types of matrices increases the UV-light blocking capacity (up to 97%). Considering the mechanical performance, not weakening of the structure is observed because of the extract addition. Films possess radical scavenging activity against DPPH with the incremental amounts of extract. Moreover, acorn shell extract as active additive in biopolymer-based sachets demonstrates an effective delay of soybean oil oxidation during 10 days of storage.

The Potential of Acorn Extract Treatment on PUFAs Oxidative Stability: A Case Study on Fish Cooking Wastewater

“…In a more recent study, several solvents were tested to develop acorn shell extract as a component for active food packaging [ 34 ]. The water extract showed an even lower TPC value (80.65 mg GAE/g of extract).…”

“…Similar results were described for acorns [ 17 , 40 ] and acorn cups [ 39 ]. The highest amount of ellagic acid associated with the highest antioxidant activity by ORAC of 50% ethanol acorn cup extract was developed by Yin et al [ 34 ]. More recently, Başyiğit et al [ 41 ] tested the food-protecting ability of an ethanolic extract of Quercus infectoria gall, where ellagic acid was the predominant compound.…”

“…More recently, an acorn shell extract was tested as a component for active food packaging [ 34 ]. This study incorporated an acorn shell extract from ultrasound-assisted extraction (70% acetone:30% water, 30 min) into chitosan and polyvinyl alcohol (PVA) films into different concentrations.…”

The Use of Biopolymers as a Natural Matrix for Incorporation of Essential Oils of Medicinal Plants

“… where F is the maximum load (kN), and a is the surface (mm 2 ). A travel speed of 10 mm/min was chosen based on standard requirements for testing films and foils of 5 to 10 mm/min, as well as on the published evidence [ 45 , 46 , 47 , 48 , 49 , 50 ].…”