*2.1. Materials*

The dried butterfly bean flower calyxes and fresh shrimp were obtained from the Zhenjiang Darunfa supermarket. Agar, ammonia, ethanol, potassium chloride, and hydrochloric acid were purchased from Sinopharm Chemical Reagent Co., Ltd. Citric acid, sodium acetate, and sodium dihydrogen citrate were bought from Jiangsu Thorpe Group Co., Ltd. (Zhenjiang, China) Carrageenan, glycerol, and disodium hydrogen phosphate were obtained from Jiangsu Chentong Chemical Co., Ltd. (Zhenjiang, China). Soybean lecithin, cholesterol, TritonX-100, and Tween80 were acquired from Zhenjiang Huadong Chemical Glass Co., Ltd. (Zhenjiang, China).
