O-acetyl galactoglucomannan esters for barrier coatings
2014 (English)In: Cellulose (London), ISSN 0969-0239, E-ISSN 1572-882X, Vol. 21, no 6, 4497-4509 p.Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
2014. Vol. 21, no 6, 4497-4509 p.
Galactoglucomannan, Hemicellulose esters, Grease barrier, WVTR, Thin coating, Biopolymer
Paper, Pulp and Fiber Technology
IdentifiersURN: urn:nbn:se:kth:diva-158809DOI: 10.1007/s10570-014-0428-7ISI: 000344802700053ScopusID: 2-s2.0-84911911636OAI: oai:DiVA.org:kth-158809DiVA: diva2:785082
QC 201502022015-02-022015-01-122015-02-02Bibliographically approved