Determination of Binding Constants of Cyclodextrins in Room-Temperature Ionic Liquids by Near-Infrared Spectrometry

2002 ◽  
Vol 74 (20) ◽  
pp. 5337-5341 ◽  
Author(s):  
Chieu D. Tran ◽  
Silvia H. De Paoli Lacerda
Keyword(s):  
Ionic Liquids ◽  
Room Temperature ◽  
Near Infrared ◽  
Binding Constants ◽  
Room Temperature Ionic Liquids ◽  
Infrared Spectrometry ◽  
Near Infrared Spectrometry

Absorption of Water by Room-Temperature Ionic Liquids: Effect of Anions on Concentration and State of Water

2003 ◽  
Vol 57 (2) ◽  
pp. 152-157 ◽  
Author(s):  
Chieu D. Tran ◽  
Silvia H. De Paoli Lacerda ◽  
Daniel Oliveira
Keyword(s):  
Ionic Liquids ◽  
Hydrogen Bonds ◽  
Room Temperature ◽  
Near Infrared ◽  
Room Temperature Ionic Liquids ◽  
Water Molecules ◽  
Structure Of Water ◽  
State Of Water

Near-infrared (NIR) spectrometry was successfully used for the noninvasive and in situ determination of concentrations and structure of water absorbed by room-temperature ionic liquids (RTILs). It was found that RTILs based on 1-butyl-3-methylimidazolium, namely, [BuMIm]+[BF4]−, [BuMIm]+[bis((trifluoromethyl)sulfonyl)amide, or Tf2N]− and [BuMIm]+[PF6]−, are hydroscopic and can quickly absorb water when they are exposed to air. Absorbed water interacts with the anions of the RTILs, and these interactions lead to changes in the structure of water. Among the RTILs studied, [BF4]− provides the strongest interactions and [PF6]− the weakest. In 24 hours, [BuMIm]+[BF4]− can absorb up to 0.320 M of water, whereas [BuMIm]+[PF6]− can only absorb 8.3 × 10−2 M of water. It seems that higher amounts of water can be absorbed when the anion of the RTIL can strongly interact and hence stabilize absorbed water molecules by forming hydrogen bonds with them or inducing hydrogen bonds among water molecules. More importantly, the NIR technique can be sensitively used for the noninvasive, in situ determination of absorbed water in RTILs, without any pretreatment, and at limits of detection as low as 3.20 × 10−3 M.

Flow-injection determination of water in organic solvents by near-infrared spectrometry

1993 ◽  
Vol 281 (2) ◽  
pp. 259-264 ◽  
Author(s):  
Salvador Garrigues ◽  
Máximo Gallignani ◽  
Miguel de la Guardia
Keyword(s):  
Organic Solvents ◽  
Flow Injection ◽  
Near Infrared ◽  
Infrared Spectrometry ◽  
Near Infrared Spectrometry

On-line non-destructive determination of proteins and infiltrated fat in Iberian pork loin by near infrared spectrometry with a remote reflectance fibre optic probe

2002 ◽  
Vol 453 (2) ◽  
pp. 281-288 ◽  
Author(s):  
Inmaculada González-Martı́n ◽  
Claudio González-Pérez ◽  
Jesús Hernández-Méndez ◽  
Noelia Alvarez-Garcı́a ◽  
José-Luis Hernández Andaluz
Keyword(s):  
Near Infrared ◽  
Infrared Spectrometry ◽  
Fibre Optic ◽  
Fibre Optic Probe ◽  
On Line ◽  
Near Infrared Spectrometry ◽  
Pork Loin ◽  
Optic Probe ◽  
Non Destructive

Viscosity-induced errors in the density determination of room temperature ionic liquids using vibrating tube densitometry

2007 ◽  
Vol 252 (1-2) ◽  
pp. 96-102 ◽  
Author(s):  
Y.A. Sanmamed ◽  
D. González-Salgado ◽  
J. Troncoso ◽  
C.A. Cerdeiriña ◽  
L. Romaní
Keyword(s):  
Ionic Liquids ◽  
Room Temperature ◽  
Room Temperature Ionic Liquids ◽  
Density Determination

Spectral Amplification in near Infrared Spectrometry

1998 ◽  
Vol 6 (A) ◽  
pp. A207-A210
Author(s):  
Marc Meurens
Keyword(s):  
Prediction Error ◽  
Diffuse Reflectance ◽  
Near Infrared ◽  
Diffuse Reflectance Spectroscopy ◽  
Reflectance Spectroscopy ◽  
Infrared Spectrometry ◽  
Chemical Analyses ◽  
Wavelength Selection ◽  
Near Infrared Spectrometry

“SPECTRAL AMPLIFICATION” is the significant name of a new algorithm of wavelength selection developed to improve the precision of the partial least squares (PLS) calibration of near infrared a (NIR) spectrometer for quantitative chemical analyses. This algorithm amplifies selectively some spectral data by mutiplicative coefficients so that they are predominant in the spectra and lower the prediction error of the PLS calibration. The poster presents a demonstration of “spectral amplification” in the determination of moisture on milk powders by NIR diffuse reflectance spectroscopy.

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