Plasmonic enhancement of the antibacterial photodynamic efficiency of a zinc tetraphenylporphyrin photosensitizer/dextran polyacrylamide anionic copolymer/Au nanoparticles hybrid nanosystem.

A zinc tetraphenylporphyrin photosensitizer/dextran polyacrylamide anionic copolymer/Au nanoparticles (ZnTPP/D--PAAan/AuNPs) triple hybrid nanosystem was synthesized in water-based solution as a nanodrug for potential photodynamic therapy applications. Dynamic light scattering studies showed that the nanosystem is stable against aggregation and sedimentation for several days after preparation. The dependence of the ZnTPP fluorescence intensity on the gold concentration in the ZnTPP/D--PAAan/AuNPs nanosystem has been revealed to be non-monotonic, with a maximum 2.

Laser-driven structural transformations in dextran--PNIPAM copolymer/Au nanoparticles hybrid nanosystem: the role of plasmon heating and attractive optical forces.

Laser induced structural transformations in a dextran grafted-poly(-isopropylacrylamide) copolymer/Au nanoparticles (D--PNIPAM/AuNPs) hybrid nanosystem in water have been observed. The laser induced local plasmonic heating of Au NPs leads to Lower Critical Solution Temperature (LCST) phase transition in D--PNIPAM/AuNPs macromolecules accompanied by their shrinking and aggregation. The hysteresis non-reversible character of the structural transformation in D--PNIPAM/AuNPs system has been observed at the decrease of laser intensity, the aggregates remains in solution after the turn-off the laser illumination.

Extracellular Synthesis of Luminescent CdS Quantum Dots Using Plant Cell Culture.

The present study describes a novel method for preparation of water-soluble CdS quantum dots, using bright yellow-2 (BY-2) cell suspension culture. Acting as a stabilizing and capping agent, the suspension cell culture mediates the formation of CdS nanoparticles. These semiconductor nanoparticles were determined by means of an UV-visible spectrophotometer, photoluminescence, high-resolution transmission electron microscopy (HRTEM), and XRD.

Biosynthesis of luminescent CdS quantum dots using plant hairy root culture.

Unlabelled: CdS nanoparticles have a great potential for application in chemical research, bioscience and medicine. The aim of this study was to develop an efficient and environmentally-friendly method of plant-based biosynthesis of CdS quantum dots using hairy root culture of Linaria maroccana L. By incubating Linaria root extract with inorganic cadmium sulfate and sodium sulfide we synthesized stable luminescent CdS nanocrystals with absorption peaks for UV-visible spectrometry at 362 nm, 398 nm and 464 nm, and luminescent peaks at 425, 462, 500 nm.