کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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608930 | 880611 | 2011 | 8 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Fluorescence of commercial Pluronic F127 samples: Temperature-dependent micellization Fluorescence of commercial Pluronic F127 samples: Temperature-dependent micellization](/preview/png/608930.png)
We present a novel approach of using the butylated hydroxytoluene (BHT) antioxidant found in commercial Pluronic F127 samples as a marker of polymer aggregation. The BHT marker was compared to the pyrene dye and static light scattering methods as a way to measure the critical micelle concentration (CMC) and critical micelle temperature (CMT). The n → π∗ transitions of BHT are sensitive to the microenvironment as demonstrated by plotting the fractional intensities of its excitation (≈280 nm) and emission (≈325 nm) peaks. BHT is more sensitive to changes in temperature than concentration. The partition coefficient increases ≈40-fold for pyrene compared to ≈2-fold for BHT when the temperature is increased from 25 to 37 °C. CMT values determined using the BHT fluorescence decrease with increasing F127 concentration. Our results show that BHT can be used as a reliable marker of changes in the microenvironment of Pluronic F127.
BHT antioxidant in Pluronic F127 can be used to probe polymer aggregation.Figure optionsDownload high-quality image (77 K)Download as PowerPoint slideResearch highlights
► Antioxidant BHT fluorescence sensitive to Pluronic F127 microenvironment.
► BHT fluorescence increases as it partitions into Pluronic F127 micellar phase.
► BHT fluorescence used to measure critical micelle temperature.
Journal: Journal of Colloid and Interface Science - Volume 354, Issue 2, 15 February 2011, Pages 662–669