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Determination of cellulose Iα and Iβ in lignocellulosic materials

✍ Scribed by Helena Lennholm; Tomas Larsson; Tommy Iversen

Book ID
102996344
Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
646 KB
Volume
261
Category
Article
ISSN
0008-6215

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✦ Synopsis

A novel method to estimate the relative amounts of cellulose I a and I, in lignocellulosic materials has been developed . 13C-CP/MAS NMR spectra were recorded on 12 calibration samples containing cellulose of various degrees of crystallinity . Principal component analysis of the NMR data extracted qualitative information about the relative amounts of amorphous cellulose, cellulose I a, and cellulose I s in the calibration samples . A quantitative partial least-squares (PLS) model was established between estimates of amorphicity index, cellulose I . -content, and cellulose I n-content and the 13 C-CP/MAS NMR data of the calibration samples . The cellulose la and Is content in some chemical and high-yield pulps was predicted from their NMR spectra by use of the PLS model . The existence of substantial amounts of cellulose I a in the pulp samples was demonstrated with the PLS model .

📜 SIMILAR VOLUMES

Crystalline cellulose Iα and Iβ studied
Crystalline cellulose Iα and Iβ studied by molecular dynamics simulation
✍ Andreas P. Heiner; Junji Sugiyama; Olle Teleman 📂 Article 📅 1995 🏛 Elsevier Science 🌐 English ⚖ 1006 KB

A recent structure determination of native cellulose has shown that it is composed of two different crystal structures, a two-chain monoclinic phase and a single-chain triclinic phase. In this article a molecular dynamics study of the two allomorphs is presented, and a general picture of structure a