The maize stem as a potential source of cellulose nanocrystal: Cellulose characterization from its phenological growth stage dependence

Autor(es)

Longaresi, R. H. ^[1] ; de Menezes, A. J. ^[2] ; Pereira-da-Silva, M. A. ^{[3, 4]} ; Baron, D. ^[1] ; Mathias, S. L. ^[2]

Afiliação do(s) autor(es)

^[1] UFSCar Univ Fed Sao Carlos, Campus Lagoa Sino, CP 094, BR-18290000 Buri, SP - Brazil

^[2] UFSCar Univ Fed Sao Carlos, Campus Sorocaba, BR-18052780 Sorocaba, SP - Brazil

^[3] IFSC USP, Inst Phys Sao Carlos, BR-13566590 Sao Carlos, SP - Brazil

^[4] UNICEP, Paulista Cent Univ Ctr, BR-13563470 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: INDUSTRIAL CROPS AND PRODUCTS; v. 133, p. 232-240, JUL 2019.
• Citações Web of Science: 2

Resumo

In this study the biomass content in different phenological growth stages (V3, V9, V13, Tasseling and R3) of the maize plant (Zea mays L.) was investigated. The biomass was quantified according to the TAPPI standards to obtain lignin, hemicellulose, alpha-cellulose, and ash contents. The cellulose content from biomass, ranging approximately from 21 to 37%, showed a dependent behavior on the phenological growth stages due to the plant physiology. Fourier Transform Infrared Spectroscopy measurements demonstrated the partial removal of lignin and hemicellulose contents in the alpha-cellulose obtention process. Scanning Electron Microscopy has confirmed the micrometer size of the raw samples and microfibrils, ranging from 100(similar to)560 mu m and from 40.4 +/- 1.5 up to 70.8 +/- 2.5 nm, respectively. The crystallinity index (CI) showed no dependence on the phenological growth stages and the X-ray diffraction patterns confirmed type I cellulose for the raw samples, and type II cellulose for the bleached fibers. The cellulose nanocrystals (CNCs) obtained by acid hydrolysis presented uniform morphology and the average length (66.7 nm), diameter (2.7 nm) and aspect ratio (24.7) were determined by a statistical analysis method. (AU)

• Processo FAPESP: 16/23812-9 - Obtenção de nanocristais de celulose de diferentes estádios fenológicos da planta de milho (Zea mays l.)
• Beneficiário: Samir Leite Mathias
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica