3 Biotech

, 9:135 | Cite as

Catalytic and antibacterial properties of gold nanoparticles synthesized by a green approach for bioremediation applications

  • J. Luis López-Miranda
  • R. Esparza
  • G. Rosas
  • R. Pérez
  • M. Estévez-GonzálezEmail author
Original Article


In this work, we are proposing the green synthesis of gold nanoparticles (AuNPs) using aqueous extracts of A. triphylla and evaluating their antibacterial and catalytic properties. Characterization was performed by UV–Vis and FT-IR spectroscopies, X-ray diffraction, and transmission electron microscopy (TEM). Antibacterial activity of AuNPs was analyzed using E. coli and S. Aureus and catalytic activity was determined by the degradation of methylene blue and congo red. UV–Vis analysis showed an increase in AuNPs concentration by increasing the extract concentration, volume extract, and precursor salt concentration. The crystalline nature of AuNPs was corroborated by X-ray diffraction. TEM analysis showed nanoparticles with spherical morphology (mostly) and size between 40 and 60 nm. These results are novel because they showed a homogeneous morphology and a narrow size distribution which is difficult to obtain in green synthesis processes. Results of antibacterial activity showed inhibition zones of 11.3 mm and 10.6 mm for S. Aureus and E. coli, respectively, indicating the bactericidal capacity of the nanoparticles. The degradation periods for methylene blue and congo red were 5 and 11 min, respectively, which are very short compared with previous reports. These results are of great significance for catalytic applications. Therefore, A. triphylla extracts made possible AuNPs synthesis and the nanoparticles obtained can be used as catalytic and antibacterial materials for water remediation.


Green synthesis Gold nanoparticles Catalytic activity Antibacterial Bioremediation Characterization Aloysia triphylla 



The authors would like to acknowledge to the Laboratorio Nacional de Caracterización de Materiales (LaNCaM) at the CFATA–UNAM. Authors acknowledge to J. A. Cervantes-Chávez from Universidad Autónoma de Querétaro for the support in the antibacterial study reported in the present work. The authors are grateful to Ana L. Ramos-Jacques for her comments in proofreading the final manuscript.

Compliance with ethical standards

Conflict of interest

On behalf of all the authors, the corresponding author states that there is no conflict of interest.


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Copyright information

© King Abdulaziz City for Science and Technology 2019

Authors and Affiliations

  • J. Luis López-Miranda
    • 1
  • R. Esparza
    • 1
  • G. Rosas
    • 2
  • R. Pérez
    • 3
  • M. Estévez-González
    • 1
    Email author
  1. 1.Centro de Física Aplicada y Tecnología AvanzadaUniversidad Nacional Autónoma de MéxicoSantiago de QuerétaroMexico
  2. 2.Instituto de Investigaciones Metalúrgicas, UMSNHMorelia MichoacánMexico
  3. 3.Instituto de Ciencias FísicasUniversidad Nacional Autónoma de MéxicoCuernavaca MorelosMexico

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