Infrared Spectroscopy

Gore, R. C.

doi:10.1021/ac60061a002

Cited by 13 publications

(1 citation statement)

References 112 publications

(118 reference statements)

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“…16 fleet 17 investigated some hydroxy compounds, Kaye reviewed nIr spectral identification and analytical applications 18 as well as instrumentation and technique, 19 while Wheeler 6 reported the nIr spectra of organic compounds. the number of publications in the 1940s is impressive and reviews were written periodically by Barnes and Gore, 20 Gore [21][22][23][24][25][26] and others 27,28 and have continued to provide reviews to the present day.…”

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confidence: 99%

A Review of Band Assignments in near Infrared Spectra of Wood and Wood Components

Schwanninger

Rodrigues

Fackler

2011

Journal of Near Infrared Spectroscopy

548

479

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Near infrared (NIR) spectra of wood and wood products contain information regarding their chemical composition and molecular structure. Both influence physical properties and performance, however, at present, this information is under-utilised in research and industry. Presently NIR spectroscopy is mainly used following the explorative approach, by which the contents of chemical components and physico-chemical as well as mechanical properties of the samples of interest are determined by applying multivariate statistical methods on the spectral data. Concrete hypotheses or prior knowledge on the chemistry and structure of the sampleexceeding that of reference data-are not necessary to build such multivariate models. However, to understand the underlying chemistry, knowledge on the chemical/functional groups that absorb at distinct wavelengths is indispensable and the assignment of NIR bands is necessary. Band assignment is an interesting and important part of spectroscopy that allows conclusions to be drawn on the chemistry and physico-chemical properties of samples. To summarise current knowledge on this topic, 70 years of NIR band assignment literature for wood and wood components were reviewed. In addition, preliminary results of ongoing investigations that also led to new assignments were included for discussion. Furthermore, some basic considerations on the interactions of NIR radiation with the inhomogeneous, anisotropic and porous structure of wood, and what impact this structure has on information contained in the spectra, are presented. In addition, the influence of common data (pre)-processing methods on the position of NIR bands is discussed. For more conclusive band assignments, it is recommended that wood is separated into its components. However, this approach may lead to misinterpretations when evaluation methods other than direct comparison of spectra are used, because isolation and purification of wood components is difficult and may lead to chemical and structural alterations when compared to the native state. Furthermore, "pure" components have more distinct and symmetric bands that influence the shape of the spectra. This extended review provides the reader with a comprehensive summary of NIR bands, as well as some practical considerations important for the application of NIR to wood.

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