Tupa Maribel Victoria, Ávila Ramírez Jhon Alejandro, Vázquez Analía, Foresti María Laura
Grupo de Biotecnología y Biosíntesis - Instituto de Tecnología en Polímeros y Nanotecnología (ITPN) - Facultad de Ingeniería, Universidad de Buenos Aires, Las Heras 2214 (CP 1127AAR), Buenos Aires, Argentina.
Grupo de Biotecnología y Biosíntesis - Instituto de Tecnología en Polímeros y Nanotecnología (ITPN) - Facultad de Ingeniería, Universidad de Buenos Aires, Las Heras 2214 (CP 1127AAR), Buenos Aires, Argentina.
Food Chem. 2015 Mar 1;170:295-302. doi: 10.1016/j.foodchem.2014.08.062. Epub 2014 Aug 23.
Starch acetates with varying degree of substitution (DS) were prepared by a novel solvent-free organocatalytic methodology. The acetylation protocol involved a non-toxic biobased α-hydroxycarboxylic acid as catalyst, and proceeded with high efficiency in absence of solvents. The effect of reaction conditions including reaction temperature (90-140 °C), catalyst load (0-2.3 g/g starch), acetic anhydride/starch weight ratio (6.5-13.5 g/g), and starch moisture content (0.6-14.8%) on the DS of the esters was evaluated. The analysis performed showed that the increase of temperature and catalyst concentration resulted in higher DS values, and evidenced a beneficial contribution of native starch moisture content on the substitution level achieved. Variation of reaction conditions allowed starch esters to be obtained with DS in the 0.03-2.93 range. Starch esters were characterised in terms of morphology, chemical structure, thermal properties, and distribution in polar/non polar liquid systems.
采用一种新型无溶剂有机催化方法制备了不同取代度（DS）的淀粉醋酸酯。乙酰化方案使用无毒的生物基α-羟基羧酸作为催化剂，在无溶剂的情况下高效进行。评估了反应温度（90 - 140°C）、催化剂用量（0 - 2.3 g/g淀粉）、乙酸酐/淀粉重量比（6.5 - 13.5 g/g）和淀粉水分含量（0.6 - 14.8%）等反应条件对酯类取代度的影响。所进行的分析表明，温度和催化剂浓度的增加导致更高的取代度值，并证明天然淀粉水分含量对所达到的取代水平有有益贡献。通过改变反应条件，可以获得取代度在0.03 - 2.93范围内的淀粉酯。对淀粉酯的形态、化学结构、热性能以及在极性/非极性液体体系中的分布进行了表征。
