Direct Determination of the S1Excited-State Energies of Xanthophylls by Low-Temperature Fluorescence Spectroscopy†

2002 ◽  
Vol 106 (19) ◽  
pp. 4815-4824 ◽  
Author(s):  
Jesusa S. Josue ◽  
Harry A. Frank
Keyword(s):  
Low Temperature ◽  
Fluorescence Spectroscopy ◽  
Direct Determination

scholarly journals A Fluorescence-Based Method for Rapid and Direct Determination of Polybrominated Diphenyl Ethers in Water

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
Huimei Shan ◽  
Chongxuan Liu ◽  
Zheming Wang ◽  
Teng Ma ◽  
Jianying Shang ◽  
...  
Keyword(s):  
Fluorescence Spectroscopy ◽  
Polybrominated Diphenyl Ethers ◽  
Environmental Variables ◽  
Fluorescence Spectra ◽  
Direct Determination ◽  
Spectral Signal ◽  
Diphenyl Ethers ◽  
Spectral Profiles ◽  
Bde 209

A new method was developed for rapid and direct measurement of polybrominated diphenyl ethers (PBDEs) in aqueous samples using fluorescence spectroscopy. The fluorescence spectra of tri- to deca-BDE (BDE 28, 47, 99, 153, 190, and 209) commonly found in environment were measured at variable emission and excitation wavelengths. The results revealed that the PBDEs have distinct fluorescence spectral profiles and peak positions that can be exploited to identify these species and determine their concentrations in aqueous solutions. The detection limits as determined in deionized water spiked with PBDEs are 1.71–5.82 ng/L for BDE 28, BDE 47, BDE 190, and BDE 209 and 45.55–69.95 ng/L for BDE 99 and BDE 153. The effects of environmental variables including pH, humic substance, and groundwater chemical composition on PBDEs measurements were also investigated. These environmental variables affected fluorescence intensity, but their effect can be corrected through linear additivity and separation of spectral signal contribution. Compared with conventional GC-based analytical methods, the fluorescence spectroscopy method is more efficient as it only uses a small amount of samples (2–4 mL), avoids lengthy complicated concentration and extraction steps, and has a low detection limit of a few ng/L.

Direct determination of paracetamol in powdered pharmaceutical samples by fluorescence spectroscopy

2005 ◽  
Vol 539 (1-2) ◽  
pp. 257-261 ◽  
Author(s):  
Altair B. Moreira ◽  
Hueder P.M. Oliveira ◽  
Teresa D.Z. Atvars ◽  
Iara L.T. Dias ◽  
Graciliano O. Neto ◽  
...  
Keyword(s):  
Fluorescence Spectroscopy ◽  
Direct Determination ◽  
Pharmaceutical Samples

Direct determination of the absorption of porous silicon by photocurrent measurement at low temperature

2000 ◽  
Vol 366 (1-2) ◽  
pp. 216-224 ◽  
Author(s):  
G Lérondel ◽  
F Madéore ◽  
R Romestain ◽  
F Muller
Keyword(s):  
Porous Silicon ◽  
Low Temperature ◽  
Direct Determination ◽  
Photocurrent Measurement

LED fluorescence spectroscopy for direct determination of monoamine oxidase B inactivation

2005 ◽  
Vol 343 (2) ◽  
pp. 293-298 ◽  
Author(s):  
J. Castillo ◽  
J. Hung ◽  
M. Rodriguez ◽  
E. Bastidas ◽  
I. Laboren ◽  
...  
Keyword(s):  
Monoamine Oxidase ◽  
Fluorescence Spectroscopy ◽  
Direct Determination ◽  
Monoamine Oxidase B

Direct determination of mineral nutrients in soybean leaves under vivo conditions by portable X‐ray fluorescence spectroscopy

2019 ◽  
Vol 49 (2) ◽  
pp. 274-283 ◽  
Author(s):  
Geovani Tadeu Costa Junior ◽  
Lidiane Cristina Nunes ◽  
Marcos Henrique Feresin Gomes ◽  
Eduardo Almeida ◽  
Hudson Wallace Pereira de Carvalho
Keyword(s):  
Fluorescence Spectroscopy ◽  
Direct Determination ◽  
Mineral Nutrients ◽  
X Ray ◽  
Soybean Leaves
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