Ultrasound-Assisted Enzymatic Extraction and Structural Characterization of Cowhide Collagen
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摘要: 以牛皮为原料,优化超声波辅助酶提取牛皮中胶原蛋白的工艺。在单因素实验的基础上设计响应面试验,以牛皮胶原蛋白提取率为响应值,优化得到胶原蛋白的最佳提取工艺,并对其进行结构表征。结果表明:牛皮中胶原蛋白的最佳提取工艺条件为超声波功率161 W、超声波处理时间64 min、胃蛋白酶添加量109 U/g、料液比1:16 g/mL,在此条件下胶原蛋白的提取率为63.77%。十二烷基硫酸钠-聚丙烯酰胺凝胶电泳(SDS-PAGE)、紫外光谱(UV)和傅立叶红外光谱(FTIR)分析表明,超声波辅助酶提取的胶原蛋白符合Ⅰ型胶原蛋白的特征,保持了其完整的三螺旋结构,氨基酸组成和扫描电镜(SEM)分析得到超声波辅助酶提取的胶原蛋白三螺旋稳定程度略微下降。本研究为牛皮中胶原蛋白的提取优化了一种有效的工艺,且很大程度上缩短了胶原蛋白的提取时间,并且具有较高的应用价值。Abstract: Using cowhide as raw material, the process of ultrasonic-assisted enzyme extraction of collagen from cowhide was optimized. Based on the single factor experiment, a response surface test was designed, and the extraction rate of cowhide collagen was used as the response value to optimize the optimal extraction process of collagen, and its structure was characterized. The results showed that the optimal extraction conditions of collagen from cowhide were ultrasonic power 161 W, ultrasonic treatment time 64 min, pepsin addition 109 U/g, and solid-liquid ratio 1:16 g/mL. Under these conditions, the extraction rate of collagen was 63.77%. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE), ultraviolet spectroscopy (UV) and Fourier transform infrared spectroscopy (FTIR) analysis showed that the collagen extracted by ultrasound-assisted enzyme was in line with the characteristics of type I collagen, maintaining its complete triple helix structure, amino acid composition and scanning electron microscope (SEM) analysis showed that the collagen triple helix extracted by ultrasonic assisted enzyme was relatively stable. In this study, an effective process is optimized for the extraction of collagen from cowhide, besides, the extraction time of collagen is greatly shortened and it has high utilization value.
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Key words:
- cowhide collagen /
- ultrasound /
- extraction rate /
- process optimization /
- structure characterization
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表 1 响应面试验因素水平表
Table 1. Factors and levels table of response surface experiment
水平 因素 A超声功率
(W)B超声时间
(min)C酶添加量
(U/g)D料液比
(g/mL)−1 120 50 87 1:10 0 150 60 105 1:15 1 180 70 123 1:20 表 2 Box-Behnken 设计方案及结果
Table 2. Design scheme and results of Box-Behnken
试验号 A
超声功率B
超声时间C
酶添加量D
料液比Y 胶原蛋白提取率
(%)1 −1 1 0 0 52.00 2 0 −1 −1 0 48.35 3 0 −1 1 0 54.40 4 −1 0 −1 0 50.03 5 0 0 0 0 63.24 6 0 0 −1 1 56.99 7 1 −1 0 0 55.43 8 0 0 1 −1 57.32 9 0 0 1 1 59.33 10 1 0 1 0 59.09 11 0 1 −1 0 55.32 12 0 −1 0 1 51.24 13 0 0 0 0 63.62 14 0 0 −1 −1 47.24 15 0 −1 0 −1 55.25 16 1 0 0 1 58.96 17 −1 −1 0 0 53.50 18 −1 0 1 0 54.60 19 0 0 0 0 62.83 20 0 1 1 0 58.85 21 1 0 0 −1 53.24 22 0 0 0 0 61.81 23 −1 0 0 1 55.14 24 0 0 0 0 61.77 25 −1 0 0 −1 51.96 26 1 0 −1 0 53.46 27 0 1 0 −1 54.21 28 0 1 0 1 59.59 29 1 1 0 0 60.87 表 3 回归模型方差分析
Table 3. Variance analysis of regression model
方差来源 平方和 自由度 均方 F值 P值 显著性 模型 520.11 11 47.28 22.42 <0.0001 ** A-超声功率 47.28 1 47.28 22.42 0.0005 ** B-超声时间 42.86 1 42.86 20.32 0.0007 ** C-酶添加量 86.45 1 86.45 40.99 <0.0001 ** D-料液比 40.45 1 40.45 19.18 0.0009 ** AB 12.06 1 12.06 5.72 0.0385 * AC 0.28 1 0.28 0.12 0.7343 AD 1.62 1 1.62 0.70 0.4170 BC 1.59 1 1.59 0.69 0.4204 BD 22.02 1 22.02 10.44 0.0081 ** CD 15 1 15 7.11 0.0232 * A2 98.07 1 98.07 46.5 <0.0001 ** B2 93.59 1 93.59 44.37 <0.0001 ** C2 120.08 1 120.08 56.93 <0.0001 ** D2 84.89 1 84.89 40.25 <0.0001 ** 残差 35.86 17 2.11 失拟项 33.04 13 2.54 3.61 0.0898 不显著 纯误差 2.82 4 0.7 总误差 555.97 28 R2=0.93 R2Adj=0.89 变异系数=1.45 注:**表示影响极显著,P<0.01;*表示影响显著,P<0.05。 表 4 FTIR红外光谱谱峰位置、峰值波数及说明
Table 4. FTIR infrared spectrum peak position, peak wave number and description
谱峰位置 峰值波数(cm−1) 说明 EEC UAEEC 酰胺A 3308.22 3305.34 N—H伸缩振动 酰胺B 3079.28 3076.40 CH2基团的反对称收缩振动 酰胺Ⅰ 1638.37 1634.07 C=O伸缩振动 酰胺Ⅱ 1548.23 1545.36 N—H弯曲振动和C—N伸缩振动 酰胺Ⅲ 1240.58 1234.42 N—H 形变振动 表 5 EEC和UAEEC二级结构含量
Table 5. Secondary structure content of EEC and UAEEC
处理方式 α-螺旋(%) β-折叠(%) β-转角(%) 无规则卷曲(%) EEC 33.70±1.44a 37.11±2.29b 8.11±0.17a 18.73±0.67b UAEEC 20.93±0.40b 44.23±1.21a 7.23±0.11b 28.37±0.68a 注:同列不同字母表示具有显著性差异(P<0.05)。 表 6 牛皮胶原蛋白的氨基酸组成分析
Table 6. Analysis of the amino acid composition of cowhide collagen
序号 氨基酸种类 氨基酸含量(%) EEC UAEEC 1 天门冬氨酸 0.02±0.00 0.04±0.00 2 谷氨酸 1.36±0.06 2.43±0.04 3 丝氨酸 2.95±0.20 3.61±0.06 4 甘氨酸 29.96±0.03 27.14±0.46 5 组氨酸 1.10±0.01 0.93±0.01 6 精氨酸 7.49±0.13 6.97±0.08 7 苏氨酸 1.92±0.14 1.09±0.05 8 丙氨酸 10.16±0.27 8.22±0.04 9 脯氨酸 29.39±0.41 35.96±0.22 10 酪氨酸 2.82±0.00 2.14±0.02 11 缬氨酸 0.28±0.00 0.24±0.00 12 蛋氨酸 2.96±0.06 2.51±0.05 13 胱氨酸 0.13±0.01 0.46±0.02 14 异亮氨酸 1.54±0.01 1.44±0.01 15 亮氨酸 3.01±0.01 2.64±0.11 16 苯丙氨酸 1.93±0.05 2.00±0.21 17 赖氨酸 2.98±0.02 2.16±0.08 -
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