Quantitative determination of polymorphic forms in a formulation matrix using the near infra-red reflectance analysis technique

1987 ◽  
Vol 5 (3) ◽  
pp. 205-211 ◽  
Author(s):  
R. Gimet ◽  
A.T. Luong
Keyword(s):  
Quantitative Determination ◽  
Analysis Technique ◽  
Infra Red ◽  
Reflectance Analysis ◽  
Polymorphic Forms

Quantitative determination of water in granites by infra-red analysis

1969 ◽  
Vol 37 (286) ◽  
pp. 256-261 ◽  
Author(s):  
J. W. Aucott ◽  
M. Marshall
Keyword(s):  
Quantitative Determination ◽  
Water Content ◽  
Vibrational Mode ◽  
Internal Standard ◽  
Free Water ◽  
Biotite Granite ◽  
Silica Content ◽  
Infra Red ◽  
Granite Samples

SummaryTwo methods using nujol and hexachloro-butadiene mulls are described to analyse the water content of powdered granite samples. The nujol mull analyses were carried out on a Unicam SP 100 spectrometer using the silica content of the rock as an internal standard. The hexachlorobutadiene mull analyses were done by a twin-path Unicam SP 200 spectrometer, using hexachlorobutadiene as the internal standard. The broader and more pronounced V1 vibrational mode (3450 cm−1) is ratioed to a standard of known composition. Comparisons are also made between absorption due to free water (V1 = 3450 cm−1) and combined water (V3 = 3680 cm−1) in aplites, biotite granite, and chlorite schists.

Perchlorate in Sea Water

1961 ◽  
Vol 41 (1) ◽  
pp. 175-186 ◽  
Author(s):  
R. Greenhalgh ◽  
J. P. Riley
Keyword(s):  
Aqueous Solution ◽  
Quantitative Determination ◽  
Water Sample ◽  
Coefficient Of Variation ◽  
Sea Water ◽  
Absorption Spectrophotometry ◽  
Infra Red ◽  
Tetraphenylarsonium Chloride

The use of tetraphenylarsonium chloride for the detection and determination of perchlorate in sea water has been investigated. An aqueous solution of this reagent gives a visible precipitate of tetraphenylarsonium perchlorate with sea water containing 5 μg ClO4-/ml. within 10 min. For the quantitative determination of traces of perchlorate, potassium perrhenate is added to the water sample, and the tetraphenylarsonium perrhenate, which is precipitated by addition of the reagent, co-precipitates tetraphenylarsonium perchlorate. Perchlorate is determined in the mixed precipitate by infra-red absorption spectrophotometry. Using 100 ml. of sea water, a sensitivity of 0·03 μg ClO4-/ml. can be attained, with a coefficient of variation of ca. 10%. No interference is caused by the ions normally present in sea water.

scholarly journals Application of the TLC image analysis technique for the simultaneous quantitative determination of L-proline and L-lysine in dietary supplement

2021 ◽  
Author(s):  
Monika Skowron ◽  
Robert Zakrzewski ◽  
Witold Ciesielski
Keyword(s):  
Image Analysis ◽  
Quantitative Determination ◽  
Dietary Supplement ◽  
Phenyl Isothiocyanate ◽  
Good Precision ◽  
Image Analysis Technique ◽  
Analysis Technique ◽  
Precision And Accuracy ◽  
Layer Chromatography

AbstractA simple and sensitive thin-layer chromatography (TLC) method coupled with an image analysis technique was developed for the simultaneous quantitative determination of L-proline and L-lysine in dietary supplement with good precision and accuracy. Separation was performed on silica gel plates using ethanol‒toluene (2:3, V/V) as the mobile phase. The visualization of chromatograms was based on iodine–azide reaction; therefore, pre-chromatographic derivatization reaction of amino acids with phenyl isothiocyanate was performed. Digital images of TLC plate chromatograms were converted into peak chromatograms, and quantitative analysis was conducted using TLSee software.

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