超声辅助酶法提取中华鳖裙边胶原蛋白及其热稳定性能

以中华鳖裙边为原料,采用单因素试验探讨加酶量、超声时间、超声功率、料液比对胶原蛋白的影响,通过Box-Behnken响应面方法建立数学模型,求得最佳酶提工艺,比较常规酶提和超声辅助酶提胶原蛋白的热稳定性能。结果表明,在提取溶剂为乙酸(0.5 mol/L)、料液比1∶20(g/m L)的条件下,采用超声酶提胶原蛋白的最佳工艺参数为加酶量0.8%、超声时间43 min、超声功率176 W,此条件下胶原蛋白得率为74.50%;差示扫描量热实验结果表明,超声酶提胶原蛋白的热稳定性显著优于常规酶提胶原蛋白。该研究可为中华鳖裙边胶原蛋白的精深加工及其应用提供一定科学依据。

Ultrasonic-Assisted Enzymatic Extraction and Thermal Stability of Collagen from Soft-Shelled Turtle Calipash

In the current study we optimized the ultrasonic-assisted enzymatic extraction of collagen from soft-shelled turtle calipash. One-factor-at-a-time method was used to investigate four factors affecting the extraction efficiency including enzyme dosage, ultrasonic time, ultrasonic power and solid-to-solvent ratio. Subsequently, a mathematical model with enzyme dosage, ultrasonic time and ultrasonic power as independent variables was established by Box-Behnken design. Meanwhile, we compared the thermostability of collagen extracted by routine enzymatic extraction and ultrasound-assisted enzymatic extraction. The optimal extraction conditions that provided the maximum collagen yield (74.50%) were determined as follows: 0.5 mol/L acetic acid as the extraction solvent, solid-to-liquid ratio 1:20 (g/mL), enzyme dosage 0.8%, ultrasonic time 43 min, and ultrasonic power 176 W. The results of differential scanning calorimetry showed that the thermostability of collagen extracted by the modified method was better than that of collagen prepared by conventional enzymatic extraction. The results of this study can provide a basis for intensitive processing and application of collagen from soft-shelled turtle calipash.