目的 以天然高分子材料作为主要原料，制备一种凝胶态大米新鲜度指示材料，并探究其对大米新鲜度的指示效果。方法 用海藻酸钠和碳酸钙等多种助剂为原料，以甲基红和溴百里酚蓝为指示剂，采用原位释放法制备大米新鲜度指示材料。结果 通过测定材料的力学性能和溶胀性能，确定海藻酸钠/碳酸钙的最优比为2∶1，葡萄糖酸内酯的最优添加量为0.156 g;通过指示材料对大米中脂肪酸的识别检测，确定甲基红与溴百里酚蓝的最优体积比为7.5∶1，复合指示剂总体积的添加量为13%。结论 海藻酸钠基大米新鲜度指示水凝胶能够应用于大米的新鲜度检测。

The paper aims to prepare a gelatinous rice freshness indicator material with natural polymer materials as the main raw material, and explore its effect on rice freshness. Using sodium alginate, calcium carbonate and other auxiliaries as raw materials, methyl red and bromothymol blue as indicators, rice freshness indicator material were prepared by in-situ release method. Through the detection of properties and swelling properties of materials, the optimal ratio of sodium alginate/calcium carbonate was 2 : 1, and the optimal additive amount of gluconolactone was 0.156 g. Through the identification and detection of fatty acids in rice by the indicator material, and the optimal volume ratio of methyl red and bromothymol blue was 7.5 :1, and the optimal additive amount of the total volume of the composite indicator was 13%. The sodium alginate-based rice freshness indicator hydrogecan be applied to the freshness detection of rice.