Spectroscopic studies of D-α-tocopherol concentration-induced transformation in egg phosphatidylcholne vesicles

Cellular & Molecular Biology Letters

Paweł Górnas¹  Małgorzata Nogala-Kałucka²  Krzysztof Dwiecki¹  Agnieszka Wilk³  Krzysztof Polewski¹ 

[1] Department of Physics, Poznań, Poland$$;Department of Biochemistry and Food Analysis, Poznań, Poland$$August Cieszkowski Agricultural University, Poznań, Poland$$;Institute of Physics, A. Mickiewicz University, Poznań, Poland$$

关键词: Egg phosphatidylcholine;    Tocopherol;    Fluorescence;    Vesicles;    Optical microscopy;    Dynamic light scattering;   

DOI  :  10.2478/s11658-006-0059-6

学科分类：分子生物学，细胞生物学和基因

来源: Uniwersytet Wroclawski * Wydzial Biotechnologii / University of Wroclaw, Faculty of Biotechnology

【 摘 要 】

The effects of embedding up to 60 mol% of α-tocopherol (α-Toc) on the morphology and structure of the egg phosphatidylcholine (PC) membrane were studied using spectroscopic techniques. The resulting vesicles were subjected to turbidometric and dynamic light scattering measurements to evaluate their size distribution. The α-Toc intrinsic fluorescence and its quenching was used to estimate the tocopherol position in the membrane. Optical microscopy was used to visualize morphological changes in the vesicles during the inclusion of tocopherol into the 2 mg/ml PC membrane. The incorporation of up to 15 mol% of tocopherol molecules into PC vesicles is accompanied by a linear increase in the fluorescence intensity and the simultaneous formation of larger, multilamellar vesicles. Increasing the tocopherol concentration above 20 mol% induced structural and morphological changes leading to the disappearance of micrometer-sized vesicles and the formation of small unilamellar vesicles of size ranging from 30 to 120 nm, mixed micelles and non-lamellar structures.

【 授权许可】

Unknown