O-acetyl galactoglucomannan esters for barrier coatings

A1 Journal article (refereed)


Internal Authors/Editors


Publication Details

List of Authors: Victor Kisonen, Chunlin Xu, Roger Bollström, Jonas Hartman, Hille Rautkoski, Maristiina Nurmi, Jarl Hemming, Patrik Eklund, Stefan Willför
Publisher: SPRINGER
Publication year: 2014
Journal: Cellulose
Journal acronym: CELLULOSE
Volume number: 21
Issue number: 6
Start page: 4497
End page: 4509
Number of pages: 13
ISSN: 0969-0239
eISSN: 1572-882X


Abstract

A major enhancement of grease and water vapor barrier properties was accomplished with a 1-10 g/m(2) coating of O-acetyl galactoglucomannan (GGM) ester or with GGM coatings applied as water dispersions on cartonboard. GGMs were esterified with phthalic and benzoic anhydrides, respectively. The novel phthalic esters of GGM (GGM-Ph) were characterized with HPLC, NMR, and matrix-assisted laser desorption/ionization with mass spectrometry (MALDI-TOF-MS). The degree of substitution of GGM-Ph was obtained by H-1 NMR, C-13 NMR, and HPLC. The GGM esters and GGM were coated onto cartonboard, and they demonstrated good moisture and very good grease resistance even with thin 1-3 g/m(2) coatings. The time for penetration of 0.1 % rapeseed oil was 54 h with the 2.4 g/m(2) coating thickness. The lowest water vapor transmission value was 39 g/m(2)/24 h with 9.7 g/m(2) coating. The GGM esters had clearly higher water resistance and slightly higher grease barrier values than native GGM. High-molar-mass-based GGM (50 kg/mol) and GGM-Ph rendered better water vapor and grease barrier properties than low-molar-mass GGM (9 kg/mol) and GGM-Ph. The GGM-based coatings can be safely used on an industrial scale as water was used as a solvent. As obtained from non-food-based side-stream wood-based resources, GGM and GGM esters project a sustainable and modern conception for barrier purposes in food packaging.


Keywords

Biopolymer, Galactoglucomannan, Grease barrier, Hemicellulose esters, Thin coating, WVTR

Last updated on 2019-18-09 at 08:32