Comparison of soybean hull pre-treatments to obtain cellulose and chemical derivatives: Physical chemistry characterization

Paola Camiscia; Enrique D V Giordano; M Emilia Brassesco; Pablo Fuciños; Lorenzo Pastrana; M F Cerqueira; Guillermo A Picó; Nadia Woitovich Valetti

doi:10.1016/j.carbpol.2018.06.125

Comparison of soybean hull pre-treatments to obtain cellulose and chemical derivatives: Physical chemistry characterization

Carbohydr Polym. 2018 Oct 15:198:601-610. doi: 10.1016/j.carbpol.2018.06.125. Epub 2018 Jul 2.

Authors

Paola Camiscia¹, Enrique D V Giordano², M Emilia Brassesco³, Pablo Fuciños⁴, Lorenzo Pastrana⁵, M F Cerqueira⁶, Guillermo A Picó⁷, Nadia Woitovich Valetti⁸

Affiliations

¹ Instituto de Procesos Biotecnológicos y Químicos (CONICET-UNR), Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario, Suipacha 570, (2002 RLK), Rosario, Argentina. Electronic address: camiscia@iprobyq-conicet.gob.ar.
² Instituto de Procesos Biotecnológicos y Químicos (CONICET-UNR), Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario, Suipacha 570, (2002 RLK), Rosario, Argentina. Electronic address: giordano@iprobyq-conicet.gob.ar.
³ Instituto de Procesos Biotecnológicos y Químicos (CONICET-UNR), Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario, Suipacha 570, (2002 RLK), Rosario, Argentina. Electronic address: brassesco@iprobyq-conicet.gob.ar.
⁴ International Iberian Nanotechnology Laboratory (INL), Avda, Mestre José Veiga s/n, 4715 Braga, Portugal. Electronic address: pablo.fucinos@inl.int.
⁵ International Iberian Nanotechnology Laboratory (INL), Avda, Mestre José Veiga s/n, 4715 Braga, Portugal. Electronic address: lorenzo.pastrana@inl.int.
⁶ International Iberian Nanotechnology Laboratory (INL), Avda, Mestre José Veiga s/n, 4715 Braga, Portugal; Centro e Departamento de Física, Universidade do Minho, Campus de Gualtar 4710-057 Braga, Portugal. Electronic address: fatima.cerqueira.vt@inl.int.
⁷ Instituto de Procesos Biotecnológicos y Químicos (CONICET-UNR), Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario, Suipacha 570, (2002 RLK), Rosario, Argentina. Electronic address: pico@iprobyq-conicet.gob.ar.
⁸ Instituto de Procesos Biotecnológicos y Químicos (CONICET-UNR), Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario, Suipacha 570, (2002 RLK), Rosario, Argentina. Electronic address: woitovichvaletti@iprobyq-conicet.gob.ar.

PMID: 30093039
DOI: 10.1016/j.carbpol.2018.06.125

Abstract

The cellulose from soybean hull, a waste without value from the argentine agriculture, was successfully obtained by using two different treatments: the traditional alkaline-bleaching pathway and from a simple pre-alkaline treatment at low temperatures. The comparison of both methods yielded similar results regarding its ability to open the lignin cellulosic structure of the hull and the total elimination of the lignin content. Fourier Transform Infrared spectroscopy (FT-IR), Thermogravimetric analysis (TGA), Scanning electron microscopy (SEM), ¹³C nuclear magnetic resonance (¹³C-RMN) and Raman spectroscopy were used to characterize the structures and the properties of cellulose. The results showed that cellulose can be easily obtained with just an alkaline pre-treatment of 5% (w/v) NaOH during 40 h at 50 °C and free of any lignin content. The attachment of different functional groups, such as -COOH and (CH₃)₃N⁺, changed the physicochemical properties of the obtained cellulose, showing mayor crystalline structure, and consequently modifying the swelling capacity and its ability to adsorb model proteins.

Keywords: Bleaching; Cellulose; Soybean hull; Thermogravimetry; Waste.