Efficiently Extracted Cellulose Nanocrystals and Starch Nanoparticles and Techno-Functional Properties of Films Made Thereof

Metzger, Christoph; Sanahuja, Solange; Behrends, Lisa; Sängerlaub, Sven; Lindner, Martina; Briesen, Heiko (2018). Efficiently Extracted Cellulose Nanocrystals and Starch Nanoparticles and Techno-Functional Properties of Films Made Thereof Coatings, 8(4), p. 142. MDPI 10.3390/coatings8040142

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Cellulose nanocrystals (CNC) and starch nanoparticles (SNP) have remarkable physical and mechanical characteristics. These properties particularly facilitate their application as high-performance components of bio-based packaging films as alternatives to fossil-based counterparts. This study demonstrates a time-efficient and resource-saving extraction process of CNC and SNP by sulfuric acid hydrolysis and neutralization. The yields of the hydrolyzed products were 41.4% (CNC) and 32.2% (SNP) after hydrolysis times of 3 h and 120 h, respectively. The nanoparticle dispersions were wet-coated onto poly(lactic acid) (PLA) and paper substrates and were incorporated into starch films. No purification or functionalization of the nanoparticles was performed prior to their application. Techno-functional properties such as the permeability of oxygen and water vapor were determined. The oxygen permeability of 5–9 cm3 (STP) 100 µm m−2 d−1 bar−1 at 50% relative humidity and 23 °C on PLA makes the coatings suitable as oxygen barriers. The method used for the extraction of CNC and SNP contributes to the economic production of these nanomaterials. Further improvements, e.g., lower ion concentration and narrower particle size distribution, to achieve reproducible techno-functional properties are tangible.

Item Type:	Journal Article (Original Article)
Division/Institute:	School of Agricultural, Forest and Food Sciences HAFL > Consumer-focused Food Production School of Agricultural, Forest and Food Sciences HAFL > Consumer-focused Food Production > Food Processing
Name:	Metzger, Christoph; Sanahuja, Solange; Behrends, Lisa; Sängerlaub, Sven; Lindner, Martina and Briesen, Heiko
Subjects:	Q Science > QC Physics Q Science > QD Chemistry T Technology > TJ Mechanical engineering and machinery T Technology > TP Chemical technology
ISSN:	2079-6412
Publisher:	MDPI
Language:	English
Submitter:	Solange Sanahuja
Date Deposited:	01 Nov 2019 11:32
Last Modified:	05 Oct 2020 12:06
Publisher DOI:	10.3390/coatings8040142
Uncontrolled Keywords:	cellulose nanocrystals (CNC); starch nanoparticles (SNP); biopolymers; packaging; barrier films; nanomaterials; nanocomposites; bio-coatings; oxygen barrier; water vapor barrier
ARBOR DOI:	10.24451/arbor.8700
URI:	https://arbor.bfh.ch/id/eprint/8700