Fluorescence of commercial Pluronic F127 samples: Temperature-dependent micellization

Perry, Christopher C, Sabir, Theodore S, Livingston, Wesley J, Milligan, Jamie R, Chen, Qiao, Maskiewicz, Victoria and Boskovic, Danilo S (2011) Fluorescence of commercial Pluronic F127 samples: Temperature-dependent micellization. Journal of colloid and interface science, 354 (2). pp. 662-669. ISSN 1095-7103

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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 (≈280nm) and emission (≈325nm) 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.

Item Type: Article
Schools and Departments: School of Life Sciences > Chemistry
Subjects: Q Science
Depositing User: Deeptima Massey
Date Deposited: 29 Oct 2012 09:08
Last Modified: 29 Oct 2012 09:08
URI: http://sro.sussex.ac.uk/id/eprint/40897
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