Characterization by Pyrolysis/Gas Chromatography/Mass Spectrometry of the Alkalilignin Obtained from Wheat Straw Soda-cooking Effluents After Treatment with Streptomyces Strains
✍ Scribed by J. Rodriguez; M. Hernández; P. Bocchini; G. C. Galletti; M. E. Arias
- Publisher
- John Wiley and Sons
- Year
- 1996
- Tongue
- English
- Weight
- 395 KB
- Volume
- 10
- Category
- Article
- ISSN
- 0951-4198
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✦ Synopsis
Alkalilignin samples obtained from untreated paper-mill effluent and eftluent decolorized by Streptomyces UAH 30 and Streptomyces UAH 51 were analyzed by pyrolysidgas chromatography/mass spectrometry. The molecular composition of the samples and the chemical modifications occurring in the lignin units were studied in order to know the mechanism of decolorization carried out by these microorganisms. The pyrolysis data showed a notable reduction in the lignin pyrolysis products of alkalilignins in efiiuent decolorized by Streptomyces strains. Moreover, chemical modifications, such as oxidation and shortening of the side chain of the phenyl-propyl moieties of lignin were also detected.
Alkalilignin preparation
Untreated and decolorized effluents were acidified with 12 M HCI to pH 1-2 and then centrifuged at 12 00Ox g for 10 min. The alkalilignin obtained after centrifugation was