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. 2017 May 25;10(6):579. doi: 10.3390/ma10060579

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© 2017 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Fourier Transform Infrared Spectroscopy (FTIR) spectra of: (a) untreated abaca; (b) NaOH-treated abaca; (c) NaOH + Al₂(SO₄)₃ treated abaca; and (d) precipitate or residue from the spent solution of Al₂(SO₄)₃ treatment.