Acetylation of barnyardgrass starch with acetic anhydride under iodine catalysis

作者：Bartz Josiane^*; Goebel Jorge Tiago; Giovanaz Marcos Antonio; Zavareze Elessandra da Rosa; Schirmer Manoel Artigas; Guerra Dias Alvaro Renato

来源：Food Chemistry, 2015, 178: 236-242.

DOI：10.1016/j.foodchem.2015.01.095

• Nonconventional starch
• Acetylation
• Iodine catalysis
• Barnyardgrass

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 10 mM 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 10 mM iodine.

• 出版日期2015-7-1