Journal of Cluster Science

, Volume 25, Issue 4, pp 1085–1098 | Cite as

Sensitivity of the Multiple Functional Moieties of Amino Acids for the Self-Assembly of Au Nanoparticles on Different Physicochemical Properties

Original Paper


This paper investigates the extent of the self-assembly process of Au nanoparticles, depending on the nature of structural and functional moieties of various amino acids (l-cystine, glutathione, l-cysteine and N-acetyl cysteine) and their influence on the plasmon sensitivity and electrokinetic parameters in correlation with the catalysis of p-nitrophenol reduction. DLS particle size analysis revealed that the hydrodynamic size 10–20 nm of Au nanospheres was increased to 135–550 nm, 100–460 nm and 130–240 nm after the addition of l-cystine, l-cysteine and glutathione, respectively, in contrast to no significant change of particle size (15–60 nm) after N-acetyl cysteine addition. This difference in the extent of aggregation as a function of structures of amino acids is further evidenced by lengthy tubular arrays formation by glutathione as compared to branched chain like morphology obtained by l-cystine through TEM. FTIR studies further confirmed the binding of amino acids to Au nanospheres via –SH followed by linking of adjacent nanoparticles through H-bonding. Due to the conformational diversity of amino acids, the surface adsorbed –SH, –COO and –NH3+ species over assembled Au nanoparticles led to the alteration of zeta potential and conductance, thus affected the catalysis for the reduction of p-nitrophenol as compared to unmodified Au nanoparticles.


Self-assemble Au nanospheres Amino acid modified Au nanoparticles Electrokinetic parameters Catalytic activity 

Supplementary material

10876_2014_691_MOESM1_ESM.doc (2.7 mb)
Supplementary material 1 (DOC 2726 kb)


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Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  1. 1.School of Chemistry and BiochemistryThapar UniversityPatialaIndia

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