Effects of gold nanoparticles on photophysical behaviour of chlorophyll and pheophytin

Author(s):Show less -

Mezacasa, A. V. ^{[1, 2]} ; Queiroz, A. M. ^{[1, 2]} ; Graciano, D. E. ^{[1, 2]} ; Pontes, M. S. ^[3] ; Santiago, E. F. ^[3] ; Oliveira, I. P. ^[4] ; Lopez, A. J. ^[5] ; Casagrande, G. A. ^[1] ; Scherer, M. D. ^[1] ; dos Reis, D. D. ^[1] ; Oliveira, S. L. ^[1] ; Caires, A. R. L. ^{[1, 6]}

Affiliation

^[1] Univ Fed Mato Grosso do Sul, Inst Phys, Campo Grande, MS - Brazil

^[2] Fed Univ Grande Dourados, Fac Exact Sci & Technol, Dourados, MS - Brazil

^[3] Univ Estadual Mato Grosso do Sul, Nat Resources Study Ctr, Dourados, MS - Brazil

^[4] Univ Sao Paulo, Inst Biomed Sci, Sao Paulo - Brazil

^[5] Univ Estadual Campinas, Inst Chem, Campinas, SP - Brazil

^[6] Univ Essex, Sch Life Sci, Colchester, Essex - England

• Document type: Journal article
• Source: JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY; v. 389, FEB 15 2020.
• Web of Science Citations: 0

Abstract

The increasing application of engineering nanoparticles (ENPs) in various commercial products justifies the need for studying their impact on living organisms and environment. The interaction between gold nanoparticles (AuNPs) with different diameters (5, 10, and 20 nm) and two photosynthetic pigments - chlorophyll (Chl) and pheophytin (Pheo) - was investigated using optical techniques and computational simulations. UV-Vis absorption, steady-state fluorescence, and time-resolved fluorescence showed that AuNPs affected the optical features of the studied photosynthetic pigments. Moreover, the optical and computational results show that an analogous Pheo molecule (chlorin) was less susceptible than an analogous chlorophyll molecule (Mg-chlorin) to interact with AuNPs. Therefore, AuNPs interact with both Chl and Pheo so that they may change the operation of the plant photosystems in case of uptake and internalisation in plants. (AU)

• FAPESP's process: 17/02201-4 - Study of the inhibition of the accumulation of cyclic nucleotide by pyridopyrimidine derivatives using molecular dynamics simulations
• Grantee: Ivan Pires de Oliveira
• Support Opportunities: Scholarships in Brazil - Post-Doctoral