pH-Responsive Polyketone/5,10,15,20-Tetrakis-(Sulfonatophenyl)Porphyrin Supramolecular Submicron Colloidal Structures

Abstract

In this work, we prepared color-changing colloids by using the electrostatic self-assembly approach. The supramolecular structures are composed of a pH-responsive polymeric surfactant and the water-soluble porphyrin 5,10,15,20-tetrakis-(sulfonatophenyl)porphyrin (TPPS). The pH-responsive surfactant polymer was achieved by the chemical modification of an alternating aliphatic polyketone (PK) via the Paal–Knorr reaction with N-(2-hydroxyethyl)ethylenediamine (HEDA). The resulting polymer/dye supramolecular systems form colloids at the submicron level displaying negative zeta potential at neutral and basic pH, and, at acidic pH, flocculation is observed. Remarkably, the colloids showed a gradual color change from green to pinky-red due to the protonation/deprotonation process of TPPS from pH 2 to pH 12, revealing different aggregation behavior.

Nitrogen Dioxide Optical Sensor Based on Redox-Active Tetrazolium/Pluronic Nanoparticles Embedded in PDMS Membranes

“…SEM morphological characterisation of the CSN was performed by scanning electron microscopy (SEM, Dual Beam FIB/SEM Helios Nano-Lab 600i, FEI, Hillsboro, OR, USA), with a 10 KeV accelerating voltage and variable magnification. For SEM analysis, the samples were deposited on a copper grid and were left to dry at room temperature and ambient pressure without metallic coating, as reported in a previous work [33].…”

Enhanced Antibacterial Activity of Vancomycin Loaded on Functionalized Polyketones

“…Within this panorama, aliphatic PK appear as an interesting yet scantly explored solution as polymeric carriers for DDS production [55,56]. In fact, aliphatic PK, produced by catalytic copolymerization of CO and ethylene, may be easily post-functionalized by means of the so-called Paal-Knorr reaction [57], allowing to obtain customized PK with specific desired functional groups [58][59][60][61][62][63][64][65][66][67][68][69][70][71].…”

Functionalized aliphatic polyketones with germicide activity

“…In this work, we aimed at developing innovative multifunctional polymeric materials, containing both germicide and polar moieties in their molecular structures. Based on our experience in the synthesis of functionalized polyketones, [14][15][16][17][18] spectrum of 2,3,4-triacetoxy-6-tosyl-a-methyl-D-glucopyranoside (2). Fig.…”

“…In this work, we aimed at developing innovative multifunctional polymeric materials, containing both germicide and polar moieties in their molecular structures. Based on our experience in the synthesis of functionalized polyketones, 14–18 we inserted quaternary ammonium groups on polyketone to make it able to kill pathogens and, at the same time, sugar portions to increase its hydrophilic properties on cellulose-based materials, such as paper objects and surfaces. These functional copolymers were prepared by grafting the new moieties on a perfect alternating aliphatic polyketone via the Paal–Knorr reaction.…”