Self-assembled chiral helical nanofibers by amphiphilic dipeptide derived from d- or l-threonine and application as a template for the synthesis of Au and Ag nanoparticles

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• 作者：Han Zhang^a ; Xia Xin^a ; ^b ; ^{xinx@sdu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Jichao Sun^a ; Liupeng Zhao^a ; Jinglin Shen^a ; Zhaohua Song^b ; Shiling Yuan^a ; ^{shilingyuan@sdu.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Dipeptide ; Threonine ; Nanofibers ; Helicity ; Nanoparticles
• 刊名：Journal of Colloid and Interface Science
• 出版年：2016
• 出版时间：15 December 2016
• 年：2016
• 卷：484
• 期：Complete
• 页码：97-106
• 全文大小：2763 K

文摘

The discovery of a class of self-assembling peptides that spontaneously undergo self-organization into well-ordered structures opened a new avenue for molecular fabrication of biological materials. In this paper, the structure controlled helical nanofibers were prepared by two artificial β-sheet dipeptides with long alkyl chains derived from l- and d-threonine (Thr) and sodium hydroxide (NaOH). These helical nanofibers have been characterized using transmission electron microscopy (TEM), field emission scanning electron microscopy (FE-SEM), atomic force microscopy (AFM), circular dichroism (CD), Fourier transform infrared (FT-IR) spectroscopy, and X-ray powder diffraction (XRD). It was demonstrated that the helicity of the nanofibers could be easily controlled by changing the chirality of the constituent amino acids in the peptide species (d- or l-threonine). Moreover, the hydrogen bonding interactions between the amide groups as well as the hydrophobic interactions among the alkyl chains play important roles in the self-assembly process. It also can be observed that with the passage of time, the hydrogen bonding interactions between the individual nanofiber induced the conversion from nanofibers to nanobelts. Particularly, gold and silver nanoparticles performed good catalytic ability were synthesized using the assembled nanofibers as template.