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Soheila Ghasemi,Marzieh Owrang,Farzad Javaheri,Fatemeh Farjadian 한국고분자학회 2022 Macromolecular Research Vol.30 No.5
Poly(N-isopropylacrylamide) (PNIPAAm) hydrogel as a temperatureresponsive polymer was prepared through controlled process using reversible addition fragmentation chain transfer (RAFT) polymerization. The hydrogel was then amino modified using a biocompatible polyamine i.e. spermine and next the antitumor cisplatin drug was conjugated to the modified hydrogel via pH-sensitive spermine linkage. This system had a pH dependency and temperature sensitivity at lower critical solution temperature (LCST). Cisplatin potentially is liberated from the carrier in the acidic environment. However, the release of cisplatin from this polymeric system is increased considerably around the transition temperature of the polymer. The drug release manner of the prepared hydrogel was determined at two pH values (5.5 and 7.4) and three temperatures (37, 40 and 42℃) at different time intervals. The in vitro toxicity assessment was conducted on MCF-7 cell line which showed the system efficiency in killing breast cancer cells.
Eslami Akbar,Mahdipour Fayyaz,Maleksari Hajar Sharifi,Varank Gamze,Ghasemi Seyed Mehdi,Nejatian Parisa,Bagheri Amin,Madihi-Bidgoli Soheila 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.12
CaO2 was activated by Fe(II) and ultrasound (US) irradiation to degrade 2,4-dichlorphenoxyacetic acid (2,4-D) for the first time. Among transition metals (Fe, Cu, Mn and Co), Fe(II) had the best performance for the activation of CaO2. The impact of pH, CaO2 and Fe(II) concentration was studied, and under optimal situation ∼91% of 2,4-D was degraded during 60 min reaction time. The quenching experiments showed that the hydroxyl radical was the main factor for the destruction of 2,4-D while superoxide anions had a minor role. The bicarbonate ions and acid humic exhibited a strong inhibitory effect on the performance of CaO2/US/Fe(II) process. Carbon and chlorine mineralization of 2,4-D degradation was investigated; around 41% of C and 35% of Cl were mineralized during 60 min reaction time. The function of CaO2/US/Fe(II) process was studied on real drainage and other organic pollutants, and the results showed that the CaO2/US/Fe(II) process can be practical for water treatment. Finally, intermediates of 2,4-D degradation were identified, a pathway was proposed, and the toxicity of intermediates was assessed by ECOSAR software.