Biopolymers based hydrogels could have applications in various fields, such as packaging materials, drug delivery systems, biosensors, and agricultural practices. The current work aimed to develop starch/xanthan hydrogels through extrusion and thermopressing processes, using citric acid (CA) as crosslinking agent and sodium hypophosphite (SHP) as catalyst. The hydrogels were produced with different levels of CA (0.00, 0.75, 1.50 and 2.25 g/100 g polymer). Hydration, mechanical, thermal and microstructural properties of the hydrogels were determined. Swelling behavior of the materials with CA was lower than the control. Additionally, CA ensured the preservation of hydrogels integrity after the swelling process. Gel fraction increased with CA 0.75 g/100 g. Starch/xanthan hydrogels crosslinked with CA demonstrated lower strength than non-crosslinked hydrogels, which may be related to acid hydrolysis of the polymer chains. CA-SHP increased the storage modulus of the hydrogels. Reactive extrusion and thermopressing were efficient methods in the production of crosslinked starch/xanthan based hydrogels.

基于生物聚合物的水凝胶可在各种领域中应用，例如包装材料，药物输送系统，生物传感器和农业实践。当前的工作旨在通过挤出和热压工艺开发淀粉/黄原胶水凝胶，其中柠檬酸（CA）作为交联剂，次磷酸钠（SHP）作为催化剂。产生具有不同含量的CA（0.00、0.75、1.50和2.25 g / 100 g聚合物）的水凝胶。测定了水凝胶的水合，机械，热和微观结构性质。具有CA的材料的溶胀行为低于对照。此外，CA确保在溶胀过程后保持水凝胶的完整性。凝胶分数随CA 0.75 g / 100 g的增加而增加。与CA交联的淀粉/黄原胶水凝胶显示出比未交联的水凝胶低的强度，这可能与聚合物链的酸水解有关。CA-SHP增加了水凝胶的储能模量。反应挤出和热压是生产交联淀粉/黄原胶水凝胶的有效方法。