Aulin-Erdtman

The various conflicting interpretations are attributed in part to the non-specific nature of the spectrum of lignin and more so to the fact that the. molecular weight of lignin is, as yet, unknown. Recently, Aulin-Erdtman (4) has successfully used the methoxyl content of various lignins instead of molecular weights in the determination of extinction coefficients. 

Aulin-Erdtman, G. Ultraviolet Spectroscopy of Lignin and Lignin Deriva-... 

The Swedish Research Council (VR), the Swedish Foundation for International Cooperation in Research and Higher Education, the Carl Trygger Foundation, the Aulin-Erdtman foundation, Knut och Alice Wallenbergs Stiftelse, and Ragnar och Astrid Signeuls for financial support. 

Aulin-Erdtman, G. Sanden, R. Acta Chem. Scand. 1968,22,1187-209. 

Table VIII compares the locations of the maxima of the spectra of the eluted vanillin, reference compound, the locations of the maxima of the spectra of the corresponding eluate of the reaction mixture, and the locations of the maxima of the spectra of vanillin as given by Aulin-Erdtman and Hegbom 4).

Bergstrom, S G. Aulin-Erdtman, B. Rolander, E. Stenbagen, and S. Ostling The Mono-oxo- and monohydroxy-octadecanoic acids. Acta Chem. Scand. 6, 1157 (1952) Chem. Abstr. 47, 8645 (1953). 

Aulin-Erdtman G (1954) Spectrographic contributions to lignin chemistry V Sven Papperstidn... 

To ensure complete oxidation of aldehydes to carboxylic acids, Aulin-Erdtman and Tomita (1963) treated the ozonation products of lignin model compounds with hydrogen peroxide. Soteland (1971) applied hydrogen peroxide to a groundwood ozonation product and found that it degraded the components to unidentified volatile substances. To simplify the product mixture, reduction is sometimes used to stop further oxidation. Tanahashi et al. (1975) applied palladium-catalyzed hydrogenation, while Kondo et al. (1987) added dimethyl sulfide. 

Aulin-Erdtman G, Tomita Y (1963) Studies on the degradation of lignin and model compounds I The configuration of dehydrodusoeugenol Acta Chem Scand 17 535-536 Bailey PS (1978) Ozonation in organic chemistry I Olefimc compounds Academic Press, New York, 272 pp... 

Milled wood lignin Coniferaldehyde UV Spectroscopy (A h,A/ ,) 3-41 Aulin-Erdtman and Hegbom 1958, Marton and Adler 1961... 

The majority of these are present in etherified coniferaldehyde units (Adler and Marton 1959, Aulin-Erdtman and Hegbom 1958). 

Adler E, Marton J, Falkehag 1 (1964a) The behavior of lignin in alkaline pulping. I. Model experiments with phenylcoumarans. Acta Chem Scand 18 1311-1312 Aulin-Erdtman G, Hegbom L (1958) Spectrographic contributions to lignin chemistry. Sven Papperstidn 61 187-210... 

A. Carboxylic acid media Acetic acid Phillips and Goss (1933) Aulin-Erdtman and Tomita... 

Aulin-Erdtman and Tomita 1963 Kaneko et al. 1983 Habu et al. 1990 Kaneko et al. 1983... 

In a series of papers, Aulin-Erdtman et al. [15-17] compiled extensive data on UV-visible spectra of lignin model phenols and the corresponding phenolate ions. A selection of these is presented in Table 3.4. 

Notes ShouWer on a band with < 210 nm. Shoulder on the 258 nm band. Shoulder on the 263 nm band. Shoulder on the 290 nm band. Shoulder on the 266 nm band. Aulin-Erdtman et al. give a single at 320 nm in their tabular data. However, to the author s eye, the spectrum seems better described as a coalescence of two bands at 300 and 330 nm. Shoulder on 344 nm band. Shoulder on the 337 nm band. 

G Aulin-Erdtman and R Sanden. Spectographic Contributions to Lignin Chemistry IX. Absorption Properties of Some 4-Hydroxyphenyl, Gnaiacyl, and 4-Hydroxy-3,5-dimeethoxyphenyl Type Compounds for Hardwood Lignins. Acta Chem. Scand. 22 1187-1209, 1968. 

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