4.7 Article

Polarity studies of single polyelectrolyte layers in polyelectrolyte multilayers probed by steady state and life time doxorubicin fluorescence

Journal

JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 607, Issue -, Pages 153-162

Publisher

ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2021.08.207

Keywords

Polarity; Doxorubicin; Fluorescence Lifetime; Polyelectrolyte Multilayers; Layer by Layer Technique

Funding

  1. ministry of research and innovation of Spain [PID2020-114356RB-I00]
  2. Agencia Nacional de Promocion Cientifica y Tecnologica (ANPCyT), Argentina [PICT-2016-0787, PICT-20193185]
  3. Consejo Nacional de Investigaciones Cientificas y Tecnicas (CONICET), Argentina
  4. PIP GI [11220130100668CO]
  5. Universidad Nacional del Sur (UNS), Argentina [PGI-UNS 24/F080]
  6. Spanish State Research Agency [MDM-2017-0720]
  7. Sapienza Visiting Professor Programme 2018
  8. Consorzio Sistemi a Grande Interfase (C.S.G.I.)

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The study explores the polarity at the single polyelectrolyte layer level inside PEMs using DX, and finds that different polar environments may be present in a PEM due to variations in charge compensation between layers.
Hypothesis: Polarity in polyelectrolyte multilayers (PEMs) may vary from the inner to the top layers of the film as the charge compensation of the layers is more effective inside the PEMs than in outer layers. Doxorubicin hydrochloride (DX) is used here to sense polarity at the single polyelectrolyte level inside PEMS. Experimental: DX is complexed electrostatically to a polyanion, either polystyrene sulfonate (PSS) or polyacrylic acid (PAA) and assembled at selected positions in a multilayer of the polyanion and polyallylamine hydrochloride (PAH) as polycation. Local polarity in the layer domain is evaluated through changes in the intensity ratio of the first to second band of spectra of DX (I1/I2 ratio) by steady state fluorescence, and by Lifetime fluorescence. Findings: PAH/PSS multilayers, show a polarity similar to water with DX/PSS as top layer, decreasing to I1/ I2 ratios similar to organic solvents as the number of polyelectrolyte layers assembled on top increases. For PAH/PAA multilayers, polarity values reflect a more polar environment than water when DX/PAA is the top layer, remaining unaltered by the assembly of polyelectrolyte layers on top. Results show that different polar environments may be present in a PEM when considering polarity at the single layer level. (c) 2021 Published by Elsevier Inc.

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