Work

Gallic acid derivatives as stabilizers in cellulose solutions: analysis by 31P NMR spectroscopy

Year: 2023

Type: article

Abstract: Lyocell dopes for cellulosic fiber manufacture, i.e., cellulose solutions in N-methylmorpholine-N-oxide monohydrate, are commonly stabilized by propyl gallate, or alternatively by recently proposed gallic acid amide derivatives. In this study, the analysis of the stabilizer and its major degradation products, ellagic acid and ellagoquinone, is investigated. The stabilizer-derived compounds are readily extracted from the dopes with polar aprotic solvents without solvent or cellulose interference. This is followed by the derivatization of the OH groups with a phosphitylation agent and subsequent 31P NMR analysis—an approach frequently used to differentiate and quantify OH groups in lignins. The chemical shifts of the resulting phosphites are reported and structures of the stabilizer derivatives are discussed. The 31P NMR approach offers a straightforward way to analyze the stabilizer chemistry in the Lyocell process. Graphical abstract

Source: Cellulose

DOI: 10.1007/s10570-023-05275-9

Authors: Johanna Zieher, Ivan Melikhov, Markus Bacher, Hubert Hettegger, Antje Potthast, Thomas Rosenau

Institutions: BOKU University, Åbo Akademi University

Language: English

Topic: Lignin and Wood Chemistry

Subfield: Biomedical Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $4,390

Funder: Universität für Bodenkultur Wien