کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7589917 1492099 2016 36 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Location of TEMPO derivatives in micelles: subtle effect of the probe orientation
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
Location of TEMPO derivatives in micelles: subtle effect of the probe orientation
چکیده انگلیسی
Partition coefficients for six 4-substituted derivatives of the 2,2,6,6-tetramethylpiperidine-N-oxyl (TEMPO) derivatives in aqueous solutions of reduced Triton X-100 (RTX-100) were determined by measurements of the probe EPR g-factor and of the fluorescence quenching of pyrene by the radical in the micelle. The partition constant attained a maximum value and then decreased with increasing probe hydrophobicity. Simulation of the probes inside the micelle showed that this trend could be rationalized by a change in the orientation of the 4-substituted TEMPO derivatives with the increasing substituent chain-length. The use of the EPR g-factor for the determination of partition constants of radicals in micellar systems was thus validated as a reliable and sensitive method, capable of describing the probe orientation in its microenvironment.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Food Chemistry - Volume 192, 1 February 2016, Pages 395-401
نویسندگان
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