Kraft lignin molecular weight distributions

Two Streptomyces strains, S. badius and S. viridosporus, were found to be able to grow on kraft lignin (In-dulin ATR) as sole carbon source. The resulting APPL (Acid Precipitable Polymeric Lignin) was characterized by FTIR and elemental analysis for C, H and N, and was found to contain proteins in addition to a relatively demethoxylated lignin component. The proteins were further characterized by amino acid analysis, while the lignin component was separated by solvent extraction and its molecular weight distribution determined by HPSEC. 

Figure 9. Apparent molecular weight distributions representing a homologous series of kraft lignin samples secured by desalting after association and dissociation in aqueous alkaline solutions for (1) 300 h, (2) 144 h and (3) 48 h at 170 gL1 in 1.0 M ionic strength aqueous 0.40 M NaOH (4) 0 h (5) 144 h and (6) 644 h at 0.50 gL 1 in aqueous 0.10 M NaOH. (Sephadex GlOO/aqueous 0.10 M NaOH elution profiles monitored at 320 nm.)...

Table 8.4.3. Molecular weight distribution of pine kraft lignin in black liquor measured by ultrafiltration...

R Morck, H Yoshida, KP Kringstad. Eractionation of Kraft Lignin by Successive Extraction with Organic Solvents I. Eunctional Groups, C NMR-spectra and Molecular Weight Distributions. Holsforschung 40(suppl) 51-60, 1986. 

Morck R, Yoshida H, Kringstad KP, Hatakeyama H (1986) Fractionation of kraft lignin by successive extraction with organic solvents-1. Functional groups, C13 NMR spectra and molecular weight distributions. Holzforschung 40 51... 

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