Browsing Chemistry by Author "Li, Lu"
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Characterization of Polysaccharides in Starch using Fluorescence Techniques
Li, Lu (University of Waterloo, 2020-09-25)Amylose and amylopectin, which are the two main constituents of starch, were characterized using the pyrene excimer fluorescence (PEF) technique. First, an amylose sample was randomly labeled with the dye pyrene to yield ... -
Characterization of the Long-Range Internal Dynamics of Pyrene-Labeled Macromolecules by Pyrene Excimer Fluorescence
Farhangi, Shiva; Casier, Remi; Li, Lu; Thoma, Janine L.; Duhamel, Jean (American Chemical Society, 2016-12)The long-range internal dynamics (LRID) of 74 pyrene-labeled macromolecules (PyLMs) were characterized in four solvents representing a broad range of dielectric constants equal to 2.4 (toluene), 7.6 (tetrahydrofuran, THF), ... -
Conformation of Pyrene-Labeled Amylose in DMSO Characterized with the Fluorescence Blob Model
Li, Lu; Duhamel, Jean (American Chemical Society, 2016-10-25)Amylose and poly(methyl acrylate) were randomly labeled with pyrene to yield a series of Py-Amylose and Py-PMA constructs, and their ability to form excimer in DMSO was characterized quantitatively by steady-state and ... -
Detection of Nitroaromatics Using the Excimer Fluorescence of Pyrene-Labeled Starch Nanoparticles
Patel, Sanjay; Seet, Jonathan; Li, Lu; Duhamel, Jean (American Chemical Society, 2019-09-09)Starch nanoparticles (SNPs) were hydrophobically modified using 1-pyrenebutyric acid (PyBA) with degrees of substitution (DS) between 0.0006 and 0.11. Fluorescence quenching studies were conducted on the pyrene-labeled ... -
DiPyMe in SDS Micelles: Artifacts and Their Implications in the Interpretation of Micellar Properties
Fowler, Michael; Hisko, Victoria; Henderson, Jason; Casier, Remi; Li, Lu; Thoma, Janine L.; Duhamel, Jean (American Chemical Society, 2015-11-10)This study provides experimental evidence that di(1-pyrenylmethyl) ether or DiPyMe, a well-known fluorescent probe employed to determine the microviscosity of surfactant or polymeric micelles, is being hydrolyzed in the ... -
Surfactant-Structure Dependent Interactions with Modified Starch Nanoparticles Probed by Fluorescence Spectroscopy
Zhang, Qian; Kim, Damin; Li, Lu; Patel, Sanjay; Duhamel, Jean (American Chemical Society, 2019-02-05)The interactions between the surfactants sodium dodecyl sulfate (SDS) and sodium dioctylsulfosuccinate (AOT) and starch nanoparticles hydrophobically modified with the hydrophobic dye pyrene (Py-SNPs) were investigated in ...