rhizome bark extract
Katerina Naumoska (Author), Urška Jug (Author), Kristi Kõrge (Author), Ana Oberlintner (Author), Majda Golob (Author), Uroš Novak (Author), Irena Vovk (Author), Blaž Likozar (Author)

Abstract

A 70% ethanol(aq) extract of the rhizome bark of the invasive alien plant species Japanese knotweed (JKRB) with potent (in the range of vitamin C) and stable antioxidant activity was incorporated in 1% w/v into a chitosan biofoil, which was then characterized on a lab-scale. The 2,2-diphenyl-1-picrylhydrazyl (DPPH) assay confirmed the antioxidant activity of the JKRB biofoil upon contact with the food simulants A, B, C, and D1 (measured half-maximal inhibitory concentrations—IC50) and supported the Folin–Ciocalteu assay result. The migration of the antioxidant marker, (−)-epicatechin, into all food simulants (A, B, C, D1, D2, and E) was quantified using liquid chromatography hyphenated to mass spectrometry (LC-MS). Calculations showed that 1 cm2 of JKRB biofoil provided antioxidant activity to ~0.5 L of liquid food upon 1 h of contact. The JKRB biofoil demonstrated antimicrobial activity against Gram-positive bacteria. The incorporation of JKRB into the chitosan biofoil resulted in improved tensile strength from 0.75 MPa to 1.81 MPa, while elongation decreased to 28%. JKRB biofoil’s lower moisture content compared to chitosan biofoil was attributed to the formation of hydrogen bonds between chitosan biofoil and JKRB compounds, further confirmed with attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR). The JKRB biofoil completely degraded in compost in 11 days. The future upscaled production of JKRB biofoil from biowastes for active packaging may support the fights against plastic waste, food waste, and the invasiveness of Japanese knotweed, while greatly contributing to the so-called ‘zero-waste’ strategy and the reduction in greenhouse gas emissions.

Keywords

Japanese knotweed rhizome bark extract;chitosan;antioxidant biofoil;antimicrobial activity;biodegradable material;active packaging;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: KI - National Institute of Chemistry
UDC: 579
COBISS: 112904195 Link will open in a new window
ISSN: 2076-3921
Views: 65
Downloads: 23
Average score: 0 (0 votes)
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Other data

Secondary keywords: Chitosan;Fallopia japonica;Rhizome;
Type (COBISS): Article
Source comment: Nasl. z nasl. zaslona; Opis vira z dne 27. 6. 2022; Št. članka: 1200;
Pages: str. 1-22
Volume: ǂVol. ǂ11
Issue: ǂno. ǂ6
Chronology: 18 Jun. 2022
DOI: 10.3390/antiox11061200
ID: 15822518