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Bioconjugates of PAMAM dendrimers with trans-retinal, pyridoxal, and pyridoxal phosphate

Authors Filipowicz A, Wołowiec S

Received 23 May 2012

Accepted for publication 29 July 2012

Published 6 September 2012 Volume 2012:7 Pages 4819—4828

DOI https://doi.org/10.2147/IJN.S34175

Checked for plagiarism Yes

Review by Single-blind

Peer reviewer comments 6

A Filipowicz, S Wołowiec

Department of Cosmetology, University of Information Technology and Management in Rzeszów, Rzeszów, Poland

Background: Bioconjugates of a polyamidoamine (PAMAM) G3 dendrimer and an aldehyde were synthesized as carriers for vitamins A and B6, and the bioavailability of these vitamins for skin nutrition was investigated.
Methods: Nuclear magnetic resonance (NMR) and ultraviolet-visible methods were used to characterize the structure of the bioconjugates and for monitoring release of pyridoxal (Pyr) and pyridoxal phosphate (PLP) from these bioconjugates in vitro. A skin model permeation of bioconjugates was also studied in a Franz chamber.
Results: A transdermal G3 PAMAM dendrimer was used to synthesize bioconjugates with trans-retinal (Ret), pyridoxal (Pyr), or PLP. These nanomolecules, containing up to four covalently linked Ret, Pyr, or PLP (G34Ret, G34Pyr, and G34PLP), were able to permeate the skin, as demonstrated in vitro using a model skin membrane. PLP and Pyr bound to a macromolecular vehicle were active cofactors for glutamic pyruvic transaminase, as shown by 1H NMR spectral monitoring of the progress of the L-alanine + α-ketoglutarate → glutamic acid + pyruvic acid reaction.
Conclusion: PAMAM-PLP, PAMAM-Pyr, and PAMAM-Ret bioconjugates are able to permeate the skin. PLP and Pyr are available as cofactors for glutamic pyruvic transaminase.

Keywords: PAMAM, trans-retinal, pyridoxal phosphate, pyridoxal, transamination

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