Synthesis of polyamidoamine dendrimer-grafted silica with microwave assisted protocol

Dendrimer-mediated proton sponge effect in the treatment of pulmonary acidosis

The present study aimed to synthesize tiotropium bromide (TIO)-loaded generation 5 polyamidoamine dendrimers (TIO-PAMAM-G5-DMs) using a solvent-free microwave assisted synthesis (MAS) for the treatment of pulmonary acidosis, a condition associated with decreased blood pH due to bronchoconstriction. The encapsulation of TIO into PAMAM-G5-DMs was achieved using MAS Michael addition and amidation reactions, following green chemistry principles. The DMs demonstrated particle size of 460.68 ± 1.38 nm, entrapment efficiency of 92.4 ± 0.44%, controlled release profiles of 90.4 ± 0.62% and 76 ± 0.84% in media of pH 6.8 and 7.4, respectively, and high buffering capacity (25 mL/pH units) using a proton sponge effect for the release of the drug into the system as compared to the conventional formulation. A synergistic rat model was used to compare the pharmacokinetics (PK) of marketed and DM-based formulations. The results showed a mean Cmax of 1987 ng/mL, tmax of 6 h, AUC of 10013863.5 ng.h/mL, and t½ of 18.59 h, respectively. The DMs exhibited low cytotoxicity, good biocompatibility, and higher IC50 value (> 10 µg) on human lung epithelial cell line BEAS-2B. Thus, our study introduces a cutting-edge alternative approach for treating pulmonary acidosis using PAMAM-DMs with proton sponge effect.

The advanced synthetic modifications and applications of multifunctional PAMAM dendritic composites

The profound advances in dendrimer chemistry have led to new horizons in polymer science.

End-grafted Cu-NNN pincer complexes on PAMAM dendrimers-SiO2: synthesis and characterization

A triazine-derived Cu(ii)-NNN pincer complex was linked onto dendritic nanoparticle supports.

Toward a Delaminated Organotalc: The Use of Polyamidoamine Dendrons

A sequence of generations of the polyamideamine dendron, PAMAM-talc-Gn (n = 1-7), was constructed on the surfaces of ethylenediaminepropyl-functionalized magnesium phyllosilicate lamellas by using a modified microwave-assisted synthesis. The successful functionalization of the inorganic layers by the organic dendrimer was confirmed by FTIR and (13)C NMR spectroscopies, elemental analyses, and thermogravimetric analysis (TGA). The solid materials presented an increase in their interlamellar space and disorganization of lamella packing with the growth of the dendrons. Thermal-programmed desorption analysis showed that the lower dendron generation, PAMAM-talc-G1, adsorbed 1.30 mmol of CO2/g of sorbent at 30 °C. PAMAM-talc-G5 adsorbed the double of PAMAM-talc-G3, probably due to the higher amount of the primary amine group; however, PAMAM-talc-G5 adsorbed more CO2 than PAMAM-talc-G7 probably because in the delaminated seventh generation intradendron N-H interactions were more prevalent than in the fifth generation and blocked CO2 interaction sites.

Immunoextraction of testosterone and epitestosterone from human urine sample based on polyamidoamine modified silica

Polyamidoamine dendrimer (PAMAM) is one of a number of dendritic polymers with precise molecular structure, highly geometric symmetry, and a large number of terminal groups. The polyamidoamine modified silica was synthesized with microwave assisted protocol. Anti-epitestosterone monoclonal antibodies were immobilized onto the PAMAM grafted silica and prepared an off-line immunoextraction column that applied in the extraction of testosterone and epitestosterone. The results showed that the affinity activity of the anti-epitestosterone monoclonal antibodies was remained at high level after immobilization. It was satisfactory to apply this new type of immunoextraction column to analyze testosterone and epitestosterone in spiked urine sample.