scholarly journals In Situ Focused Beam Reflectance Measurement (FBRM), Attenuated Total Reflectance Fourier Transform Infrared (ATR-FTIR) and Raman Characterization of the Polymorphic Transformation of Carbamazepine

Pharmaceutics ◽  
2012 ◽  
Vol 4 (1) ◽  
pp. 164-178 ◽  
Author(s):  
Yingying Zhao ◽  
Ying Bao ◽  
Jingkang Wang ◽  
Sohrab Rohani
Keyword(s):  
Fourier Transform ◽  
Polymorphic Transformation ◽  
Fourier Transform Infrared ◽  
Attenuated Total Reflectance ◽  
Reflectance Measurement ◽  
Total Reflectance ◽  
Raman Characterization ◽  
Focused Beam

Characterization of cotton fabric scouring by Fourier transform-infrared attenuated total reflectance spectroscopy, gas chromatography-mass spectrometry and water absorption measurements

2018 ◽  
Vol 89 (12) ◽  
pp. 2305-2315 ◽  
Author(s):  
Eun Kyung Choe ◽  
Myunghee Lee ◽  
Kwang Seo Park ◽  
Chinkap Chung
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Fourier Transform ◽  
Water Absorption ◽  
Cotton Fabric ◽  
Fourier Transform Infrared ◽  
Gas Chromatography Mass Spectrometry ◽  
Attenuated Total Reflectance ◽  
Total Reflectance

Surface sensitive Fourier transform-infrared attenuated total reflectance (ATR) accessories using different crystals as well as incident beam angles were examined for the characterization of cotton fabric scouring. The extra sharp antisymmetric and symmetric C-H stretching peaks due to long chain alkyls at 2918 and 2849 cm−1 were observed in greige cotton fabrics with a tendency to be more profound with the ATR cell with bigger incident angles and a higher refractive index, due to less depth of penetration. Water absorption data and gas chromatography-mass spectrometry analyses indicated that these peaks were mostly caused by secondary added paraffin wax of higher linear alkanes (C22 to C30) and cotton wax of C16 and C18 fatty acids in free form. Absence of these peaks alone did not result in sufficient water absorption. No observation of carboxylate (COO−) peak at 1600 cm−1 together ensured a successful scouring. Presence of this weak peak can be further confirmed by the reversible shift between 1600 cm−1 and 1750 cm−1 of protonated carboxylic acids (COOH) under non-destructive and quick HCl or NH3 vapor exposures on cotton samples.

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