Document Detail


Determination of surface-accessible acidic hydroxyls and surface area of lignin by cationic dye adsorption.
MedLine Citation:
PMID:  25033327     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
A new colorimetric method for determining the surface-accessible acidic lignin hydroxyl groups in lignocellulose solid fractions was developed. The method is based on selective adsorption of Azure B, a basic dye, onto acidic hydroxyl groups of lignin. Selectivity of adsorption of Azure B on lignin was demonstrated using lignin and cellulose materials as adsorbents. Adsorption isotherms of Azure B on wheat straw (WS), sugarcane bagasse (SGB), oat husk, and isolated lignin materials were determined. The maximum adsorption capacities predicted by the Langmuir isotherms were used to calculate the amounts of surface-accessible acidic hydroxyl groups. WS contained 1.7-times more acidic hydroxyls (0.21mmol/g) and higher surface area of lignin (84m(2)/g) than SGB or oat husk materials. Equations for determining the amount of surface-accessible acidic hydroxyls in solid fractions of the three plant materials by a single point measurement were developed. A method for high-throughput characterization of lignocellulosic materials is now available.
Authors:
Mika Henrikki Sipponen; Ville Pihlajaniemi; Kuisma Littunen; Ossi Pastinen; Simo Laakso
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2014-6-27
Journal Detail:
Title:  Bioresource technology     Volume:  169C     ISSN:  1873-2976     ISO Abbreviation:  Bioresour. Technol.     Publication Date:  2014 Jun 
Date Detail:
Created Date:  2014-7-17     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9889523     Medline TA:  Bioresour Technol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  80-87     Citation Subset:  -    
Copyright Information:
Copyright © 2014 Elsevier Ltd. All rights reserved.
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