Study of microbial polyhydroxyalkanoates using two-dimensional Fourier-transform infrared correlation spectroscopy

2001 ◽  
Vol 82 (4) ◽  
pp. 934-940 ◽  
Author(s):  
Qiong Wu ◽  
Ge Tian ◽  
Suqin Sun ◽  
Isao Noda ◽  
Guo-Qiang Chen
Keyword(s):  
Fourier Transform ◽  
Fourier Transform Infrared ◽  
Correlation Spectroscopy ◽  
Two Dimensional

Variable-Temperature Fourier Transform Infrared Spectroscopic Investigations of Poly(3-Hydroxyalkanoates) and Perturbation-Correlation Moving-Window Two-Dimensional Correlation Analysis. Part I: Study of Non-Annealed and Annealed Poly(3-Hydroxybutyrate) Homopolymer

2009 ◽  
Vol 63 (9) ◽  
pp. 1027-1033 ◽  
Author(s):  
Miriam Unger ◽  
Shigeaki Morita ◽  
Harumi Sato ◽  
Yukihiro Ozaki ◽  
Heinz W. Siesler
Keyword(s):  
Fourier Transform ◽  
Correlation Analysis ◽  
Crystalline State ◽  
Variable Temperature ◽  
Fourier Transform Infrared ◽  
Melting Behavior ◽  
Correlation Spectroscopy ◽  
Moving Window ◽  
Two Dimensional ◽  
Ft Ir

Generalized two-dimensional correlation spectroscopy (2DCOS) and perturbation-correlation moving-window two-dimensional (PCMW2D) correlation spectroscopy were applied to explore the melting behavior of non-annealed and annealed poly(3-hydroxybutyrate) (PHB) homopolymer as studied by variable-temperature Fourier transform infrared (FT-IR) spectroscopy. The absorption band of the C=O stretching vibration was employed to investigate the structural changes during the heating process (30–200 °C). Non-annealed PHB showed a recrystallization process in the temperature range 30–120 °C. In the asynchronous 2D correlation spectrum we clearly captured the existence of two components in the crystallinity-sensitive wing of the C=O stretching mode: a well-ordered crystalline state at lower wavenumbers (1718 cm−1) and a less ordered crystalline state at higher wavenumbers (1724 cm−1). These crystallinity-sensitive bands at 1718 and 1724 cm−1, which are not readily detectable in the one-dimensional (1D) FT-IR spectra, share asynchronous cross-peaks with bands at around 1737 and 1747 cm−1 assignable to the C=O stretching absorptions due to the amorphous components. In the case of the melting process of non-annealed PHB in the temperature range 120–200 °C, it is helpful to use the PCMW2D correlation analysis, which indicates the recrystallization between 40 and 110 °C by the shift of the C=O stretching band from 1726 cm−1 to 1722 cm−1 and the sharp change to the broad amorphous C=O stretching absorption at 1747 cm−1 at the melting temperature of PHB around 190 °C. For an annealed sample of PHB only the melting behavior was observed in the PCMW2D correlation analysis by the sharp transition from the crystalline to the amorphous C=O stretching band.

One- and two-dimensional Fourier transform infrared correlation spectroscopy of Phyllagathis rotundifolia

2011 ◽  
Vol 1006 (1-3) ◽  
pp. 297-302 ◽  
Author(s):  
Hooi Poay Tan ◽  
Sui Kiong Ling ◽  
Cheng Hock Chuah
Keyword(s):  
Fourier Transform ◽  
Fourier Transform Infrared ◽  
Correlation Spectroscopy ◽  
Two Dimensional

Discrimination of authentic Polyporus umbellatus and counterfeit by Fourier Transform Infrared and two dimensional infrared correlation spectroscopy

2020 ◽  
Vol 1199 ◽  
pp. 126917
Author(s):  
Xiangdong Chen ◽  
YewKeong Choong ◽  
Weiwei Zhang ◽  
Guoqiang Li ◽  
Jin Lan
Keyword(s):  
Fourier Transform ◽  
Fourier Transform Infrared ◽  
Correlation Spectroscopy ◽  
Two Dimensional ◽  
Polyporus Umbellatus

Two-dimensional Fourier transform infrared correlation spectroscopy and evolving factor analysis in the study of cationic curing of DGEBA and γ-valerolactone mixtures

2008 ◽  
Vol 46 (12) ◽  
pp. 3886-3899 ◽  
Author(s):  
Nicolás Spegazzini ◽  
Itziar Ruisánchez ◽  
M. Soledad Larrechi ◽  
Angels Serra ◽  
Ana Mantecón
Keyword(s):  
Factor Analysis ◽  
Fourier Transform ◽  
Fourier Transform Infrared ◽  
Correlation Spectroscopy ◽  
Two Dimensional

Application of Step-Scan Interferometry to Two-Dimensional Fourier Transform Infrared (2D FT-IR) Correlation Spectroscopy

1991 ◽  
Vol 45 (1) ◽  
pp. 12-17 ◽  
Author(s):  
Richard A. Palmer ◽  
Christopher J. Manning ◽  
James L. Chao ◽  
Isao Noda ◽  
Anthony E. Dowrey ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Fourier Transform Infrared ◽  
Correlation Spectroscopy ◽  
Two Dimensional ◽  
Ft Ir
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