-
摘要: 研究了动态高压微射流技术对木瓜蛋白酶活性的影响,并以荧光光谱为检测手段对木瓜蛋白酶的分子构象进行表征。结果显示,动态高压微射流处理(120~180 MPa)后,木瓜蛋白酶酶活降低。经180 MPa处理1次,木瓜蛋白酶相对酶活降至90.04%。随着处理压力的增加,木瓜蛋白酶分子、酪氨酸残基、色氨酸残基的荧光发射峰位置分别从对照组的334、285、277.5 nm红移至140 MPa处理组的335.5、285.5、278.5 nm,然后回移至180 MPa处理组的334、285、278 nm。在0~4 ℃放置24 h后,酶活进一步降低,木瓜蛋白酶和酪氨酸残基的荧光强度出现波动(降低、上升然后再降低),表明动态高压微射流处理(120~180 MPa)改变木瓜蛋白酶分子构象的效果较为明显,形成的新构象稳定性低。Abstract: The effect of dynamic high pressure microfluidization (DHPM) on the activity of papain had been investigated, and the molecular conformation changes of papain had been detected by fluorescence spectra. The results showed that after DHPM (120~180 MPa) treatment, the enzyme activity decreased in different degrees. The papain activity reduced to 90.04% after 180 MPa treatment. With the increasing of treatment pressure, the fluorescence emission peaks of papain, Tyr and Trp residues gradually red shifted from 334, 285 and 277.5 nm for untreated sample to 335.5, 285.5 and 278.5 nm for 140 MPa treated sample, and then returned to 334, 285 and 278 nm for 180 MPa treated sample, respectively. After 24 h placing at 0~4 ℃, papain activity further decreased and the fluorescence intensity of papain and Tyr residue showed oscillate (down, up and down), which indicated that DHPM treatment (120~180 MPa) changed the molecular conformation of papain visibly with low stability of the new formed conformation.
-
Liu W, Liu J H, Xie M Y, et al. Characterization and High Pressure Microfluidization-Induced Activation of Polyphenoloxidase from Chinese Pear (Pyrus Pyrifolia Nakai) [J]. J Agric Food Chem, 2009, 57(12): 5376-5380. Iordache M, Jelen P. High Pressure Microfluidization Treatment of Heat Denatured Whey Proteins for Improved Functionality [J]. Innovat Food Sci Emerg Tech, 2003, 4(4): 367-376. Giancarlo F, Marco F, Maria E G. Effect of High Hydrostatic Pressure and High Pressure Homogenization on the Enantioselectivity of Microbial Reductions [J]. Tetrahedron: Asymmetry, 1996, 7(10): 2879-2887. Jafari S M, He Y H, Bhandari B. Optimization of Nano-Emulsions Production by Microfluidization [J]. Eur Food Res Technol, 2007, 255(5-6): 733-741. Thompson A K, Singh H. Preparation of Liposomes from Milk Fat Globule Membrane Phospholipids Using a Microfluidizer [J]. J Dairy Sci, 2006, 89: 410-419. Liu C M, Liu W, Xiong H W, et al. Effect of Instantaneous High Pressure (IHP) Treatment on Solubility and Rheologic Properties of Soybean Dietary Fiber [A]//The 232nd ACS National Meeting [C]. San Francisco, America, 2006: 33. Smelt J P P M. Recent Advances in the Microbiology of High Pressure Processing [J]. Trends Food Sci Tech, 1998, 9(4): 152-158. Liu W, Zhang Z Q, Xie M Y, et al. Ability and Stability Change of Trypsin Treated by Dynamic High-Pressure Microfuidization [A]//International Conference on Non-Thermal Processing Technologies [C]. Beijing, 2009: 1. Wallerstein L. Prevention the Clouding of Beer on Chilling by Adding Papain: US, 995: 825 [P]. 1911-6-20. Drenth J, Jansonius J N, Koekoek R, et al. Structure of Papain [J]. Nature, 1968, 218: 929-932. Zeng Q M, Pan J, Xie H M, et al. Effect of High Pressure (HP) Treatments on Polyphenoloxidase (PPO) Activity in Pear Juices [J]. Chinese Journal of High Pressure Physics, 2004, 18(2): 144-148. (in Chinese) 曾庆梅, 潘见, 谢慧明, 等. 超高压处理对多酚氧化酶活性的影响 [J]. 高压物理学报, 2004, 18(2): 144-148. Xie H M, Huang X D, Pan J, et al. Effect of High Pressure on Exoproteinase of Bacillus Subtilis [J]. Chinese Journal of High Pressure Physics, 2007, 21(1): 95-102. (in Chinese) 谢慧明, 黄训端, 潘见, 等. 超高压对枯草杆菌胞外蛋白酶的影响 [J]. 高压物理学报, 2007, 21(1): 95-102. Gomes M R A, Sumner I G, Ledward D A. Effects of High Pressure on Papain Activity and Structure [J]. J Sci Food Agr, 1997, 75(1): 67-72. Huang L, Sun Y M, Pan K, et al. Influence of Ultra High Pressure on Peroxidase Pectin Methyl Esterase and Soluble Protein in Litchi Fruit [J]. Chinese Journal of High Pressure Physics, 2005, 19(2): 179-182. (in Chinese) 黄丽, 孙远明, 潘科, 等. 超高压处理对荔枝果肉中两种酶和可溶性蛋白的影响 [J]. 高压物理学报, 2005, 19(2): 179-182. Huang L, Sun Y M, Chen B N, et al. Influence of Combined Treatment of Ultra High Pressure and Enzyme Inhibitors on Peroxidase and Pectin Methyl Esterase in Litchi Pulp [J]. Chinese Journal of High Pressure Physics, 2007, 21(1): 89-94. (in Chinese) 黄丽, 孙远明, 陈柏暖, 等. 超高压和酶抑制剂联合处理对荔枝果肉中过氧化物酶和果胶甲基酯酶的影响 [J]. 高压物理学报, 2007, 21(1): 89-94. Zeng Q M, Pan J, Xie H M, et al. Effect of Ultra High Pressure (UHP) Treatment on the Secondary Structure and Activity of Horseradish Peroxidase (HRP) [J]. Food Science, 2005, 26(5): 29-33. (in Chinese) 曾庆梅, 潘见, 谢慧明, 等. 超高压处理对辣根过氧化物酶二级结构及其活力的影响 [J]. 食品科学, 2005, 26(5): 29-33. Liu W, Liu C M, Zhong Y J, et al. Effect of Instantaneous High Pressure Process on Polyphenoloxidase Activities [J]. Food Science, 2006, 27(10): 179-183. (in Chinese) 刘伟, 刘成梅, 钟业俊, 等. 瞬时高压作用对多酚氧化酶活性的影响 [J]. 食品科学, 2006, 27(10): 179-183. Liu W, Xie M Y, Liu J H, et al. Effect of Instantaneous High Pressure Treatment on Activity of Polyphenol Oxidase from Pears [A]//The 14th World Congress of Food Science Technology [C]. Shanghai, 2008: 538. Liu W, Liu J H, Liu C M. Activation and Conformational Changes of Mushroom Polyphenoloxidase by High Pressure Microfluidization Treatment [J]. Innovat Food Sci Emerg Tech, 2009, 10(2): 142-147. Li F Y, Xing Y J, Ding X. Immobilization of Papain on Cotton Fabric by Sol-Gel Method [J]. Enzyme Microb Technol, 2007, 40(7): 1692-1697. Katsaros G I, Katapodis P, Taoukis P S. High Hydrostatic Pressure Inactivation Kinetics of the Plant Proteases Ficin and Papain [J]. J Food Eng, 2009, 91(1): 42-48. Sun N, Lee S, Song K B. Effect of High-Pressure Treatment on the Molecular Properties of Mushroom Polyphenoloxidase [J]. LWT-Food Sci Techol, 2002, 35(4): 315-318.
点击查看大图
计量
- 文章访问数: 7510
- HTML全文浏览量: 276
- PDF下载量: 723