Effect of the milling process on the thermal behavior and crystallinity of buckwheat starch

Autor(es)

Demario Vieira, Renata Leia ^[1] ; Gaglieri, Caroline ^[2] ; de Oliveira, Cristina Soltovski ^[1] ; Ferreira, Laura Teofilo ^[2] ; Schnitzler, Egon ^[1] ; Bannach, Gilbert ^[2]

Afiliação do(s) autor(es)

^[1] Univ Estadual Ponta Grossa, Av Carlos Cavalcanti 4748, BR-84030900 Ponta Grossa, Parana - Brazil

^[2] Sao Paulo State Univ, Sch Sci, UNESP, Chem Dept, BR-17033260 Bauru, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY; v. 144, n. 3 MAR 2020.
• Citações Web of Science: 0

Resumo

Buckwheat starch is an alternative source to supply the high global demand for starch. The properties of starch can be modified through chemical and physical methods; one of them is the milling process, which can be considered as green method according with the green chemistry principles. Thus, this work aims to use the milling process and study its effects on thermal and crystalline properties of starch extracted from common buckwheat (Fagopyrum esculentum). It was observed in differential scanning calorimetry and X-ray powder diffraction that after the milling process, the starch losted its crystallinity and was pre-gelatinized. Nevertheless, the samples showed similar decomposition, dehydration and oxidation profiles, as observed by thermogravimetry and differential thermal analysis curves. The thermal stability did not show considerable difference (less than 5 degrees C) after the milling process. Moreover, the medium infrared spectroscopy showed that the milling process did not change the functional groups of starch. The morphology of the starch granules, as observed by scanning electron microscope presented surface roughness, and also the decrease of the average diameter of the modified starch was observed. (AU)

• Processo FAPESP: 17/08820-8 - Síntese e caracterização de biopolímeros a partir de óleos vegetais e glicerol seguindo os princípios da química verde.
• Beneficiário: Gilbert Bannach
• Modalidade de apoio: Auxílio à Pesquisa - Regular