• 食品工程 •

### 超声处理改善羊乳理化性质及其酶凝胶流变学特性

1. （1.中国农业科学院农产品加工研究所，北京 100193；2. 黑龙江飞鹤乳业有限公司，黑龙江 哈尔滨 150030）
• 发布日期:2021-09-29
• 基金资助:
“十三五”国家重点研发计划重点专项（2018YFC1604301；2017YFE0131800）；国家自然科学基金面上项目（31871834）

### Sonication Improves Physicochemical Properties of Goat Milk and Rheological Properties of Rennet-Induced Goat Milk Gel

ZHANG Shuwen, Eman Saad RAGAB, ZHANG Yumeng, WANG Tong, PANG Xiaoyang, LU Jing, JIANG Shilong, LENG Youbin, LÜ Jiaping

1. (1. Institute of Food Science and Technology, Chinese Academy of Agricultural Sciences, Beijing 100193, China; 2. Heilongjiang Feihe Dairy Co., Ltd., Harbin 150030, China)
• Published:2021-09-29

Abstract: The effect of different durations (15, 20, 25 and 30 min) of ultrasound treatment at a frequency of 20 kHz and a power of 800 W on the particles size, zeta potential, surface hydrophobicity and secondary structures of goat milk proteins was evaluated. Furthermore, the effect on rheological properties and microstructure of rennet-induced goat milk gel was studied by rheological measurement and scanning electron microscopy (SEM). The results showed that ultrasonic treatments reduced the particles size and altered the secondary structures of milk proteins significantly, increasing the percentages of β-sheet and random coil and decreasing the percentages of α-helix and β-turn. The β-sheet structure showed a positive correlation (r = 0.74) with the surface hydrophobicity. Prolonged (more than 20 min) sonication resulted in a significant (P < 0.05) increase in the maximum storage modulus (G’max) when compared to unsonicated raw goat milk and pasteurized goat milk, and the rennet coagulation time decreased after 25, 30 min of ultrasonic treatment. SEM observation revealed that the gel microstructure of the sonicated samples was more interconnected. To sum up, ultrasonic treatment could effectively improve the quality of rennet-induced goat milk gel and have potential application value in industrial production.