Fluorescence polarization method for studying molecular orientation of mono- and multilayered polyimide films prepared by the Langmuir-Blodgett technique

1991 ◽  
Vol 24 (3) ◽  
pp. 659-665 ◽  
Author(s):  
Shinzaburo Ito ◽  
Koichi Kanno ◽  
Satoru Ohmori ◽  
Yoshihiko Onogi ◽  
Masahide Yamamoto
Keyword(s):  
Fluorescence Polarization ◽  
Molecular Orientation ◽  
Polarization Method ◽  
Polyimide Films ◽  
Langmuir Blodgett

ChemInform Abstract: FT IR Spectra and Molecular Orientation in Thin Langmuir-Blodgett Films of Dodecyloxyphenylpyrazine Carboxylic Acid and Its Barium Salt.

ChemInform ◽  
2010 ◽  
Vol 22 (7) ◽  
pp. no-no
Author(s):  
T. KAMATA ◽  
J. UMEMURA ◽  
T. TAKENAKA ◽  
K. TAKEHARA ◽  
K. ISOMURA ◽  
...  
Keyword(s):  
Carboxylic Acid ◽  
Ir Spectra ◽  
Molecular Orientation ◽  
Barium Salt ◽  
Langmuir Blodgett ◽  
Langmuir Blodgett Films ◽  
Ft Ir

Molecular Orientation and Photocurrent of Alkyl-Aromatic Polyimide Films Prepared by Vapor Deposition Polymerization

1989 ◽  
Vol 28 (Part 1, No. 12) ◽  
pp. 2552-2555 ◽  
Author(s):  
Kazuo Iida ◽  
Tsukasa Nohara ◽  
Kazuyuki Totani ◽  
Shuhei Nakamura ◽  
Goro Sawa
Keyword(s):  
Vapor Deposition ◽  
Molecular Orientation ◽  
Polyimide Films ◽  
Aromatic Polyimide

Optimization of a Fluorescence Polarization Immunoassay for Rapid Quantification of Deoxynivalenol in Durum Wheat–Based Products

2006 ◽  
Vol 69 (11) ◽  
pp. 2712-2719 ◽  
Author(s):  
VINCENZO LIPPOLIS ◽  
MICHELANGELO PASCALE ◽  
ANGELO VISCONTI
Keyword(s):  
High Pressure ◽  
Liquid Chromatography ◽  
Durum Wheat ◽  
High Pressure Liquid Chromatography ◽  
Fluorescence Polarization ◽  
Fluorescence Polarization Immunoassay ◽  
Polarization Method ◽  
Chromatography Method ◽  
Liquid Chromatography Method ◽  
Rapid Quantification

A fluorescence polarization immunoassay previously described for deoxynivalenol (DON) screening in wheat was optimized for the rapid quantification of DON in durum wheat kernels, semolina, and pasta. A background signal was observed in both spiked and naturally contaminated samples, strictly depending on the testing matrix. After subtracting the background DON level for durum wheat (0.27 μg of DON per g), semolina (0.08 μg of DON per g), and pasta (0.04 μg of DON per g), an accurate quantification of DON was possible at levels greater than 0.10 μg/g for all matrices. Average recoveries from spiked samples (0.25 to 1.75 μg/g) were 98, 102, and 101% for wheat, semolina, and pasta, respectively. Comparative analyses of 35 naturally contaminated durum wheat samples, 22 semolina samples, and 26 pasta samples performed by both the fluorescence polarization method and high-pressure liquid chromatography/immunoaffinity cleanup showed a good correlation (r > 0.995). The fluorescence polarization method showed better accuracy and precision with respect to the high-pressure liquid chromatography method and is suitable for the rapid and quantitative determination of DON in durum wheat–based products at levels foreseen by existing or coming international regulations.

Molecular Orientation of Langmuir−Blodgett Films of Designed Heme Protein and Lipoprotein Maquettes

1998 ◽  
Vol 102 (33) ◽  
pp. 6425-6432 ◽  
Author(s):  
Xiaoxi Chen ◽  
Christopher C. Moser ◽  
Denis L. Pilloud ◽  
P. Leslie Dutton
Keyword(s):  
Molecular Orientation ◽  
Heme Protein ◽  
Langmuir Blodgett ◽  
Langmuir Blodgett Films

Polyamic Acid Langmuir-Blodgett (LB) Films Containing A Stable Second-Order NLO Chromophore

1995 ◽  
Vol 413 ◽  
Author(s):  
D. W. Cheong ◽  
J. -I Chen ◽  
J. Kumar ◽  
S. K. Tripathy
Keyword(s):  
Nonlinear Coefficient ◽  
Polarized Light ◽  
Second Order ◽  
Polyimide Films ◽  
Polyamic Acid ◽  
Lb Films ◽  
Langmuir Blodgett ◽  
Number Of Layers ◽  
Absorption Correction ◽  
Nlo Chromophores

ABSTRACTNonlinear optical (NLO) LB films of polyamic acid containing a stable NLO dye were prepared and imidized either chemically or thermally. The optical properties and molecular orientation of these LB films were studied. From the absorption spectra, we infer that the derivative of the pnitroazobenzene chromophore covalently attatched to polyamic acid did not show significant aggregation. Quadratic dependence of SHG on the number of layers in polyamic acid films indicated the noncentrosymmetric organization of polar NLO chromophores. A second-order nonlinear coefficient (d33) of 23.4 pm/V was observed at 1064 nm after absorption correction. In polyimide films, SH intensity was dramatically reduced due to the collapse of the layered structure upon imidization process. In-plane isotropy of the LB films of polyamic acid and polyimide were lost upon irradiation of polarized light.

scholarly journals Studies of the Agarose Gelling System by the Fluorescence Polarization Method. II.

1978 ◽  
Vol 10 (5) ◽  
pp. 485-494 ◽  
Author(s):  
Akira Hayashi ◽  
Kyosuke Kinoshita ◽  
Masaru Kuwano ◽  
Atsumi Nose
Keyword(s):  
Fluorescence Polarization ◽  
Polarization Method
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