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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Lignin contributions to the nanoscale porosity of raw and treated lignocelluloses as observed by calorimetric thermoporometry

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Driemeier, Carlos [1] ; Oliveira, Marcelo M. [1, 2] ; Curvelo, Antonio A. S. [1, 3]
Total Authors: 3
[1] CNPEM, Lab Nacl Ciencia & Tecnol Bioetanol CTBE, Caixa Postal 6192, BR-13083970 Sao Paulo - Brazil
[2] Univ Sao Paulo, EESC, Caixa Postal 780, BR-13560970 Sao Paulo - Brazil
[3] Univ Sao Paulo, IQSC, Caixa Postal 780, BR-13560970 Sao Paulo - Brazil
Total Affiliations: 3
Document type: Journal article
Source: INDUSTRIAL CROPS AND PRODUCTS; v. 82, p. 114-117, APR 2016.
Web of Science Citations: 8

Thermoporometry probes water in nanoscale confinement, the so-called freezing bound water (FBW). Although well established for characterization of delignified cellulosics, application and interpretation of thermoporometry has been elusive for lignin-containing biomass. Here we show that calorimetric thermoporometry discriminates two types of lignin contributions to the nanoscale porosity of a wide set of raw and treated lignocelluloses. First, the well-known role of lignin as pore filler is observed as delignification-promoted gains in FBW, mainly in pores of 10-200 nm. Second, lignocelluloses submitted to acidic aqueous treatments present an additional FBW contribution, mainly in pores <4 nm. This FBW at smaller dimensions is attributed to surface irregularities of the lignin aggregates left by the acidic treatments. Hence, our findings demonstrate that thermoporometry detects a confined water state associated with restructured lignin, thus contributing to the understanding of processes for biomass valorization. (C) 2015 Elsevier B.V. All rights reserved. (AU)

FAPESP's process: 10/05523-3 - Nanomorphologic changes of sugarcane lignocellulosic matter
Grantee:Carlos Eduardo Driemeier
Support type: Research Grants - Young Investigators Grants