“…UCST). 43 Figure 2.(a) UCST of PAA/MTA IPSAM and (b) UCST of PAA/MTA (5/5) with H 2 O 2 treatment.Figure 3.Interfacial tension of PAA solution, MTA solution and PAA/MTA IPSAM solutions.…”
Section: Resultsmentioning
confidence: 99%
“…The fluorescence intensity was measured at 613 nm in real time on a fluorescence spectrophotometer using an excitation wavelength of 556 nm. 43 where F t is the fluorescence intensity at a time-lapse, and F o is the fluorescence intensity at time zero.…”
Section: Methodsmentioning
confidence: 99%
“…UCST). 43 Figure 2(b) shows the oxidation-dependent optical density diagram of the PAA/MTA (5/5) solution (z mM, H 2 O 2 ). The reason why the PAA/MTA (5/5) solution was chosen for the experiment was due to the oxidation of MTA on the UCST.…”
Poly (acrylic acid) (PAA), an anionic polymer was used to prepare ion pair self-assembly (IPSAM) with 4-(methylthio)aniline (MTA), a hydrophobic counter ion, which is responsive to temperature and oxidation. The IPSAM was formed when the carboxylic to amino group molar ratio was 7/3-5/5. The structure of the IPSAM nanoparticle was spherical whose diameter was 30-40 nm on the TEM images. The PAA/MTA ion pair showed the upper critical solution temperature (UCST) that hiked with increasing MTA content. When the MTA of the ion pair was oxidized by H2O2, the UCST was also increased. The amphiphilic property of the ion pair was responsible for interface activity which declined upon the oxidation of the MTA. The surface tension was low for the ratio of PAA/MTA (5/5), which made the 5/5 ratio suitable for further studies. The interaction between PAA and MTA, which was ionic, and the oxidation of MTA was confirmed by FT-IR spectroscopy. The release of payload (i.e. Nile red) in IPSAM was restrained below the UCST but it was triggered above the phase transition temperature possibly due to the disintegration of the IPSAM whereas on MTA oxidation the release was shielded due to more hydrophobicity. The release was found to be higher in tumor environment temperature which could be controlled with the input concentration of H2O2 giving a stable IPSAM. The cell viability results showed that IPSAM has no significant cytotoxicity and can serve as a drug carrier for stimulus-response.
“…UCST). 43 Figure 2.(a) UCST of PAA/MTA IPSAM and (b) UCST of PAA/MTA (5/5) with H 2 O 2 treatment.Figure 3.Interfacial tension of PAA solution, MTA solution and PAA/MTA IPSAM solutions.…”
Section: Resultsmentioning
confidence: 99%
“…The fluorescence intensity was measured at 613 nm in real time on a fluorescence spectrophotometer using an excitation wavelength of 556 nm. 43 where F t is the fluorescence intensity at a time-lapse, and F o is the fluorescence intensity at time zero.…”
Section: Methodsmentioning
confidence: 99%
“…UCST). 43 Figure 2(b) shows the oxidation-dependent optical density diagram of the PAA/MTA (5/5) solution (z mM, H 2 O 2 ). The reason why the PAA/MTA (5/5) solution was chosen for the experiment was due to the oxidation of MTA on the UCST.…”
Poly (acrylic acid) (PAA), an anionic polymer was used to prepare ion pair self-assembly (IPSAM) with 4-(methylthio)aniline (MTA), a hydrophobic counter ion, which is responsive to temperature and oxidation. The IPSAM was formed when the carboxylic to amino group molar ratio was 7/3-5/5. The structure of the IPSAM nanoparticle was spherical whose diameter was 30-40 nm on the TEM images. The PAA/MTA ion pair showed the upper critical solution temperature (UCST) that hiked with increasing MTA content. When the MTA of the ion pair was oxidized by H2O2, the UCST was also increased. The amphiphilic property of the ion pair was responsible for interface activity which declined upon the oxidation of the MTA. The surface tension was low for the ratio of PAA/MTA (5/5), which made the 5/5 ratio suitable for further studies. The interaction between PAA and MTA, which was ionic, and the oxidation of MTA was confirmed by FT-IR spectroscopy. The release of payload (i.e. Nile red) in IPSAM was restrained below the UCST but it was triggered above the phase transition temperature possibly due to the disintegration of the IPSAM whereas on MTA oxidation the release was shielded due to more hydrophobicity. The release was found to be higher in tumor environment temperature which could be controlled with the input concentration of H2O2 giving a stable IPSAM. The cell viability results showed that IPSAM has no significant cytotoxicity and can serve as a drug carrier for stimulus-response.
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