Green Synthesis, Characterization and Cholinesterase Inhibitory Potential of Gold Nanoparticles

  • Zainab University of Malakand
  • Khalid Saeed Bacha Khan University
  • Ammara University of Malakand
  • Shujaat Ahmad Shaheed Benazir Bhutto University
  • Hanif Ahmad University of Malakand
  • Farhat Ullah University of Malakand
  • Abdul Sadiq University of Malakand
  • Ala Uddin Bacha Khan University
  • Idrees Khan Bacha Khan University
  • Manzoor Ahmad University of Malakand
Keywords: Green synthesis, morphology, gold nanoparticles, enzyme inhibition, bioactivity

Abstract

Abstract. The green synthesis of gold nanoparticles (Au NPs) from their precursor was carried out using Delphinium uncinatum and Erythrophyleum guineense plants extracts. The Au NPs obtained were characterized by various instrumental techniques such as scanning electron microscopy (SEM), energy dispersive X-ray (EDX), X-ray diffraction (XRD) and UV/Visible (UV/VIS) spectrophotometer. The SEM study presented that E. guineense (GE) and D. uncinatum (GN) synthesized gold nanoparticles was below 100 and 300 nm, respectively.  The micrographs also presented that E. guineense (GE) synthesized gold particles had irregular round shaped while the D. uncinatum (GN) synthesized nanoparticles had cylindrical shaped. The XRD spectra presented peaks at about 38.1°, 44.43°, 64.6° and 77.64° can be indexed to (111), (200), (220) and (311) orientation, respectively, which confirmed the presence of gold nanoparticles. It means that both E. guineense (GE) and D. uncinatum (GN) synthesized gold nanoparticles are highly crystalline.  The UV/VIS analysis presented that both plant extracts significantly reduced the gold slat and as a result high quantity of gold nanoparticles were formed. The E. guanense gold NP and D. uncinatum gold NPs were investigated for their in-vitro cholinesterases inhibitory potentials in 62.5-1000 µg/mL concentrations range. The bioactivity results presented that the loading of the test samples in gold NPs enhanced their AChE and BChE inhibitory potentials.

 

Resumen. La síntesis verde de nanopartículas de oro (NP de Au) se llevó a cabo mediante extractos de plantas de Delphinium uncinatum y Erythrophyleum guineense. Las NP de Au obtenidas se caracterizaron mediante diversas técnicas instrumentales como microscopía electrónica de barrido (SEM), dispersión de energía de rayos X (EDX), difracción de rayos X (XRD) y espectrofotómetro UV / Visible (UV / Vis). El estudio SEM reveló tamaños de las nanopartículas de oro sintetizadas por E. guineense (GE) y D. uncinatum (GN) por debajo de 100 y 300 nm, respectivamente. Las micrografías también mostraron que las partículas de oro sintetizadas por E. guineense (GE) tenían una forma redonda irregular, mientras que las nanopartículas sintetizadas por D. uncinatum (GN) tenían una forma cilíndrica. Los patrones XRD presentaron picos a aproximadamente 38.1 °, 44.43 °, 64.6 ° y 77.64 ° pueden indexarse ​​a la orientación (111), (200), (220) y (311), respectivamente, lo que confirmó la presencia de nanopartículas de oro cristalinas. El análisis UV / Vis mostró que ambos extractos de plantas formaron nanopartículas de oro. Se investigaron las NP de oro como inhibidores de colinesterasas in vitro en un intervalo de concentraciones de 62.5 a 1000 µg / ml. Los resultados de la bioactividad mostraron que la carga de las muestras de prueba en NP de oro mejoró sus potenciales inhibidores de AChE y BChE.

Author Biographies

Zainab, University of Malakand

Department of Chemistry

Khalid Saeed, Bacha Khan University

Department of Chemistry

Ammara, University of Malakand

Department of Chemistry

Shujaat Ahmad, Shaheed Benazir Bhutto University

Department of Pharmacy

Hanif Ahmad, University of Malakand

Department of Chemistry

Farhat Ullah, University of Malakand

Department of Pharmacy

Abdul Sadiq, University of Malakand

Department of Pharmacy

Ala Uddin, Bacha Khan University

Department of Chemistry

Idrees Khan, Bacha Khan University

Department of Chemistry

Manzoor Ahmad, University of Malakand

Department of Chemistry

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Published
07-01-2021