title: Acetylation of barnyardgrass starch with acetic anhydride under iodine catalysis.
abstract: Barnyardgrass (Echinochloa crus-galli) is an invasive plant that is difficult to control and is found in abundance as part of the waste of the paddy industry. In this study, barnyardgrass starch was extracted and studied to obtain a novel starch with potential food and non-food applications. We report some of the physicochemical, functional and morphological properties as well as the effect of modifying this starch with acetic anhydride by catalysis with 1, 5 or 10mM of iodine. The extent of the introduction of acetyl groups increased with increasing iodine levels as catalyst. The shape of the granules remained unaltered, but there were low levels of surface corrosion and the overall relative crystallinity decreased. The pasting temperature, enthalpy and other gelatinisation temperatures were reduced by the modification. There was an increase in the viscosity of the pastes, except for the peak viscosity, which was strongly reduced in 10mM iodine.
authors.affiliation: Departamento de Ciência e Tecnologia Agroindustrial, Universidade Federal de Pelotas, 96010-900 Pelotas, Brazil. Electronic address: josibartz@gmail.com.
authors.forename: Josiane
authors.initials: J
authors.lastname: Bartz
authors.affiliation: Departamento de Ciência e Tecnologia Agroindustrial, Universidade Federal de Pelotas, 96010-900 Pelotas, Brazil.
authors.forename: Jorge Tiago
authors.initials: JT
authors.lastname: Goebel
authors.affiliation: Departamento de Fitotecnia, Universidade Federal de Pelotas, 96010-900 Pelotas, Brazil.
authors.forename: Marcos Antônio
authors.initials: MA
authors.lastname: Giovanaz
authors.affiliation: Departamento de Ciência e Tecnologia Agroindustrial, Universidade Federal de Pelotas, 96010-900 Pelotas, Brazil.
authors.forename: Elessandra da Rosa
authors.initials: Eda R
authors.lastname: Zavareze
authors.affiliation: Departamento de Ciência e Tecnologia Agroindustrial, Universidade Federal de Pelotas, 96010-900 Pelotas, Brazil.
authors.forename: Manoel Artigas
authors.initials: MA
authors.lastname: Schirmer
authors.affiliation: Departamento de Ciência e Tecnologia Agroindustrial, Universidade Federal de Pelotas, 96010-900 Pelotas, Brazil.
authors.forename: Alvaro Renato Guerra
authors.initials: AR
authors.lastname: Dias
mesh_terms: D000089:Acetic Anhydrides / Q000737:chemistry; D000107:Acetylation; D002384:Catalysis; D031747:Echinochloa / Q000737:chemistry*; D007455:Iodine / Q000737:chemistry*; D010936:Plant Extracts / Q000737:chemistry* / Q000302:isolation & purification; D013213:Starch / Q000737:chemistry* / Q000302:isolation & purification; D013696:Temperature; D014783:Viscosity
chemical_list: D000089:Acetic Anhydrides; D010936:Plant Extracts; C031800:acetic anhydride; D013213:Starch; D007455:Iodine
keywords: Acetylation; Barnyardgrass; Iodine catalysis; Nonconventional starch