工程异构结构铁纳米酶装饰脂肪体具有自级催化性能
Teng Wang1,2, Qing Wu1,2, Zhenyu Wang1,2
1State Key Laboratory of Ultrasound in Medicine and Engineering, College of Biomedical Engineering, Chongqing Medical University, Chongqing 400016, China. maox@cqmu.edu.cn.
Biomaterials science
|July 28, 2023
概括
这项研究引入了一种新的大豆酸胆/Fe3O4@Ag/GOx (SFAG) 生物复合物,作为级联金属酶模仿剂. 在生理条件下的葡萄糖检测中,SFAG表现出高效的过氧化酶类活性,为化学动力学应用提供了有前途的工具.
科学领域:
- 生物材料科学 生物材料科学
- 纳米技术纳米技术
- 酶模仿的酶模仿者
背景情况:
- 基于金属的酶模仿剂对于制造异质生物复合材料至关重要.
- 氧化铁纳米粒子 (Fe3O4 NPs) 是金属酶的一个有希望的替代品.
- 在生理条件下克服过氧化物类酶活性限制是必不可少的.
研究的目的:
- 为了制造一个大豆酸胆/Fe3O4@Ag/GOx (SFAG) 生物复合物作为一个级联酶.
- 为了研究SFAG在葡萄糖检测中类似过氧化酶的特性.
- 用超声波和微流体学来探索合成机制.
主要方法:
- 使用超声波和微流体方法制造SFAG生物复合材料.
- 描述SFAG属性,包括吸收峰值,尺寸和表面电荷.
- 通过用H2O2.2催化TMB来检测类似过氧酶的活性.
- 确定H2O2.2的迈凯利斯-门参数 (Km,Vmax).
- 在PBS和合成血液中测定葡萄糖的应用.
主要成果:
- SFAG在652nm处表现出特有的吸收峰值,尺寸为55μm,表面电荷为-32.93 ± 2.58 mV.
- 在生理条件下证实了类似过氧酶的活性,在pH值5.8,7.4和8.0时活性增强.
- 对H2O2的迈凯利斯-门参数被确定为Km = 1.914 mM和Vmax = 1.429 × 10^-7 M s^-1.
- 在PBS和合成血液中成功确定葡萄糖,具有出色的灵敏度和稳定性.
结论:
- 该SFAG生物复合物表现出有效的过氧化酶类活性和催化性能.
- 开发的平台显示出在化学动力学应用中作为级联金属酶的巨大潜力.
- SFAG提供了一种稳定而敏感的葡萄糖测定方法.
相关概念视频
01:07Catalytically Perfect Enzymes
The theory of catalytically perfect enzymes was first proposed by W.J. Albery and J. R. Knowles in 1976. These enzymes catalyze biochemical reactions at high-speed. Their catalytic efficiency values range from 108-109 M-1s-1. These enzymes are also called 'diffusion-controlled' as the only rate-limiting step in the catalysis is that of the substrate diffusion into the active site. Examples include triose phosphate isomerase, fumarase, and superoxide dismutase.
01:13Introduction to Mechanisms of Enzyme Catalysis
For many years, scientists thought that enzyme-substrate binding took place in a simple "lock-and-key" fashion. This model stated that the enzyme and substrate fit together perfectly in one instantaneous step. However, current research supports a more refined view scientists call induced fit. The induced-fit model expands upon the lock-and-key model by describing a more dynamic interaction between enzyme and substrate. As the enzyme and substrate come together, their interaction causes a mild...