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Polymeric micelles as a new generation of anti-oxidant carriers

Arrigo R., Tzankova Dintcheva N., Catalano G., Morici E., Cavallaro G., Lazzara G., Bruno M.

Polimery

2017

T. 62, nr 7-8

525--531

A promising strategy to immobilize a natural stabilizer in polymeric films is presented. Particularly, nevadensin (N, a natural basil flavonoid) molecules have been encapsulated in Pluronic F-127 micelles [F127, a triblock copolymer poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide)] and the obtained nanoparticles have been introduced in poly(ethylene glycol), PEG [otherwise known as poly(ethylene oxide), PEO]. In order to verify the effectiveness of the micelles as anti-oxidant carriers, PEG-based films have been subjected to artificial weathering. The encapsulation of anti-oxidant molecules allows the enhancement of N solubility in PEG, leading to advanced materials with enhanced photo-oxidative stability.

Przedstawiono obiecującą metodę immobilizacji naturalnych przeciwutleniaczy w materiale błon polimerowych. Cząsteczki naturalnego bazyliowego flawonoidu nevadensin (N) poddawano enkapsulacji w micelach tworzących się w roztworze triblokowego kopolimeru poli(tlenek etylenu)-poli(tlenek propylenu)-poli(tlenek etylenu), [PEO-PPO-PEO] – Pluronic F-127 (F127), a otrzymane nanocząstki wprowadzano do matrycy poli(tlenku etylenu) [PEO = PEG, poli(glikolu etylenowego)]. W celu zweryfikowania efektywności miceli jako nośników przeciwutleniaczy, błony wytworzone na bazie PEG poddano procesowi sztucznego starzenia. Stwierdzono, że enkapsulacja cząstek N w micelach F127 zwiększa rozpuszczalność nevadensinu w PEG, co umożliwia otrzymanie nowatorskiego materiału o zwiększonej stabilności fotooksydacyjnej.

Stimuli responsive polymeric nanoparticles in regulated drug delivery for cancer

Yadav D., Suri S., Chaudhary A.A., Hemant, Beg M. N., Asif M., Ahmad A.

Polish Journal of Chemical Technology

2012

Vol. 14, nr 1

57-64

Stimuli-responsive drug delivery system is a concept in which a drug is delivered at a suitable rate in response to stimuli. States of diseases may cause an alteration in some parameters of the body (e.g. in tumors) and the onset and offset of the drug delivery can be done by using this as a stimuli or a "trigger". Stimuli-responsive ("intellectual" or "sharp") resources and molecules show abrupt property changes in response to miniature changes in external stimuli such as pH, temperature etc. For regulated drug delivery, environmental stimuli such as pH and temperature, which undertake phase transition in polymer system, have been investigated. Thermally-responsive polymers can be tuned to a preferred temperature variety by copolymerization with a hydrophilic co-monomer or a hydrophobic co-monomer. Hydrophilic co-monomers increase the LCST while hydrophobic co-monomers decrease the LCST. The stimuli responsive polymer for regulated drug delivery can contain a polymer and copolymers having equilibrium of hydrophilic and hydrophobic groups. A number of these polymers have been investigated extensively and some success in drug delivery with them has been achieved, such as polymers and copolymers of N-isopropylacrylamide, PLGA, and PLA, HEMA etc. Thus this review is designed for stimuli pH and temperature responsive polymeric nanoparticles, which would be helpful to treat various cronic diseases such as cancer and others, for scientists in the field of the regulated drug delivery system.