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Study on Mechanical Property of Individual Ferritin

Author: ZhangJinHai
Tutor: LouSenYue;ZhouXingFei
School: Ningbo University
Course: Theoretical Physics
Keywords: ferritin elastic modulus atomic force microscopy (AFM) adsorption pH
CLC: Q51
Type: Master's thesis
Year: 2009
Downloads: 3
Quote: 0
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Abstract


The nano-biological material is a focus in material science. The nano-biological technique will be the potentialest technique in the 21st century. The nano-biological technique is a joint class by nano meter technique and biological technique. The nano-biological technique is very important in chemistry and biological nano-structure. The new process is high precision, high agility and low cost, so it will be widely used in biological, medicine, electronics and material.The iron-storage proteins ferritins broadly exist in animals, plants and human bodies. Besides its important biological function, ferritin has been used widely in materials science due to its unique physical and chemical properties, such as magnetic and electrochemical properties. For example, ferritin has been used as a catalyst for carbon nanotube growth and as a template for synthesis of magnetic and photonic nanostructures. Recently, Shin et al. reported that poly(vinyl alcohol) (PVA) nanofibers containing bimolecular ferritin nanoparticles exhibited the enhancement of elastic modulus as compared to pure PVA nanofibers due to chemical interactions between the ferritin and the PVA matrix. Bhattacharyya found that the novel composite films containing ferritin-functionalized multiwall carbon nanotubes (MWCNTs) were reinforced by hydrogen bonding formed between the ferritin functionalized MWCNTs and the polymeric films.The particular structure of ferritin and how to participate in and how to keep the iron metabolize balance in the body were clarified in this work. The correlative information about Atomic Force Microscopy (AFM) were introduced. We investigated the pH-dependent adsorption of ferritin on mica modifisd by APS. The result was the surface density of ferritin was controlled by a variatin in the solution pH (from 3 to 7). The mechanical property of individual ferritin was measured with force-volume mapping (FV) under contact mode of AFM in this work. The elastic modulus of individual ferritin was estimated by the Hertz mode. In addition, the elastic modulus of individual ferritin was compared with that of the colloid gold nanoparticle.

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CLC: > Biological Sciences > Biochemistry > Protein
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