Journal of Thermal Analysis and Calorimetry

, Volume 132, Issue 2, pp 1039–1053 | Cite as

Investigation into the physical–chemical properties of chemically pretreated sugarcane bagasse

  • Glauber Cruz
  • Patrícia A. Santiago
  • Carlos E. M. Braz
  • Paulo SeleghimJr.
  • Paula Manoel Crnkovic


Enzymatic hydrolysis is one of the major steps involved in the conversion of sugarcane bagasse into ethanol. Pretreatments break down macrostructures in order to improve the enzyme access to the targeted glycosidic bonds. This study reports on the use of thermoanalytic techniques together with other different techniques for the verification of the structural and morphological changes occurred in sugarcane bagasse subjected to acid and alkaline pretreatments. The techniques evaluated differences in the BET and BJH surface areas, diameter and pore volume investigated by porosimetry, scanning electron microscopy and wettability. Thermal analysis (TG/DTG and DTA) was also used to evaluate the thermal degradation of hemicelluloses, cellulose and lignin contents that remained in the samples after pretreatments. The results show that chemical pretreatments were effective in the degradation of lignocellulosic samples and significant morphological changes occurred after the pretreatments. Acid and alkaline pretreatments caused an increase in the surface area, diameter and volume of pores. Wettability also revealed important effects regarding surface changes of the biomasses. In summary, all tested pretreatments were effective to chemically degrade the macrostructures of sugarcane bagasse that hinder enzymatic hydrolysis in, for instance, the second-generation ethanol production.

Graphical Abstract


Bioethanol production Chemical pretreatment Enzymatic hydrolysis Lignocellulosic biomass Thermal analysis Surface area 



The authors gratefully acknowledge CAPES (DS00011/07-0) and FAPESP (2010/20681-4 and 2012/00639-2) for the financial support, Thermal Engineering and Fluids Laboratory (LETeF) from University of São Paulo (USP), Dra. Adriana Faria de Azevedo (National Institute for Space Research—INPE) for the Wettability analysis, and Angela Pregnolato Giampedro for the English language review.


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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2018

Authors and Affiliations

  • Glauber Cruz
    • 1
    • 2
  • Patrícia A. Santiago
    • 2
  • Carlos E. M. Braz
    • 3
  • Paulo SeleghimJr.
    • 2
  • Paula Manoel Crnkovic
    • 2
  1. 1.Department of Mechanical EngineeringFederal University of MaranhãoSão LuísBrazil
  2. 2.Thermal Engineering and Fluids Laboratory, Department of Mechanical Engineering, Engineering School of São CarlosUniversity of São PauloSão CarlosBrazil
  3. 3.Department of ChemistryFederal University of São CarlosSão CarlosBrazil

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