Morphological and physicochemical characterization of starches from underground stems of Trimezia juncifolia collected in different phenological stages

Autor(es)

Almeida, Viviane O. ^[1] ; Di-Medeiros, Maria C. B. ^[2] ; Batista, Karla A. ^{[1, 3]} ; Moraes, Moemy G. ^[4] ; Fernandes, Katia F. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Goias, Inst Ciencias Biol, Lab Quim Polimeros, ICB 2, Goiania, Go - Brazil

^[2] Univ Fed Sao Carlos, Dept Quim, Lab Ressonancia Magnet Nucl, Sao Carlos, SP - Brazil

^[3] Inst Fed Educ Ciencia & Tecnol Goias, Dept Areas Acad, Campus Goiania Oeste, Goiania, Go - Brazil

^[4] Univ Fed Goias, ICB 1, Inst Ciencias Biol, Lab Fisiol Vegetal, Goiania, Go - Brazil

• Tipo de documento: Artigo Científico
• Fonte: International Journal of Biological Macromolecules; v. 166, p. 127-137, JAN 1 2021.
• Citações Web of Science: 0

Resumo

In this study, starches from underground stems of Trimezia Pont-Vona were evaluated during dry season (DSS), wet season (WSS) and sprouting (SS). Results evidenced that drought stress did not interfere with the yield, amylose content and degree of polymerization (DP) of amylopectin. However, the extraction yield in SS was 58% lower, being observed and increase of 7.5% in the content of amylose, and 135% in DP values for SS amylopectin, with a predominance of A-chains. The amount of total sugar, the starch granules size as well as solubility and swelling properties varied as function of the phenological status. Also, starch granules changed from A-type polymorph in DSS and SS to a C-A-type in WSS. Nevertheless, it was observed a crystallinity reduction from 56% in DSS to 37.1% in SS. In addition, thermograms evidenced the presence of amylose-lipid complexes, with endothermic transition temperatures being affected by drought stress and sprouting. Finally, results demonstrate that underground stems from T. juncifolia have adaptative strategies involving changes in the morphological and physicochemical properties of the starch granules. (C) 2020 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 19/16135-9 - Controle biorracional de insetos pragas e fitopatógenos
• Beneficiário: Maria Carolina Bezerra di Medeiros Leal
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado