ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTwo-Dimensional Fourier Transform Near-Infrared Correlation Spectroscopy Studies of Temperature-Dependent Spectral Variations Oleyl AlcoholIsao Noda, Yongliang Liu, Yukihiro Ozaki, and Miroslaw A. CzarneckiCite this: J. Phys. Chem. 1995, 99, 10, 3068–3073Publication Date (Print):March 1, 1995Publication History Published online1 May 2002Published inissue 1 March...

Despite considerable efforts in developing curve-fitting protocols to evaluate the crystallinity index (CI) from X-ray diffraction (XRD) measurements, its present state XRD can only provide a qualitative or semi-quantitative assessment of amounts crystalline amorphous fraction sample. The greatest barrier establishing quantitative is lack appropriate cellulose standards, which are needed calibrate measurements. In practice, samples with known CI very difficult prepare determine. previous...

With cotton fiber growth or maturation, cellulose content in fibers markedly increases. Traditional chemical methods have been developed to determine content, but it is time-consuming and labor-intensive, mostly owing the slow hydrolysis process of components. As one approach, attenuated total reflection Fourier transform infrared (ATR FT-IR) spectroscopy technique has also utilized monitor formation, by implementing various spectral interpretation strategies both multivariate principal...

Individual fiber strength is an important quality attribute that greatly influences the of yarn spun from cotton fibers. Fiber usually measured bundles fibers due to difficulty reliably measuring individual However, bundle (BFS) not always correlated with since it affected by multiple properties involved in fiber-to-fiber interactions within a addition strength. Molecular mechanisms responsible for regulating remain unknown. Gossypium hirsutum near isogenic lines (NILs), MD52ne and MD90ne...

The premelting behavior of Nylon 12 has been investigated by two-dimensional (2D) Fourier-transform (FT) near-infrared (NIR) correlation spectroscopy. FT-NIR spectra in a cast film have measured over temperature range 30−150 °C. 2D NIR analysis reveals that there are at least eight bands the 6800−6100 cm-1 region where first overtone an NH stretching mode is expected to appear. They may be ascribed free- and hydrogen-bonded groups various environments. asynchronous spectrum above indicates...

This paper demonstrates the potential of two-dimensional infrared−Raman (2D IR-Raman) heterospectral correlation spectroscopy in analyses IR and Raman spectra complex systems correlations between bands. Temperature-dependent spectral variations N-methylacetamide (NMA) pure liquid state have been investigated as first example 2D IR-Raman study. NMA measured over a temperature range 30−65 °C. Generalized has also performed to assist analysis. The spectroscopic analysis reveals that amide I...

Conventional methods for detecting aflatoxigenic fungus and aflatoxin contamination are generally time-consuming, sample-destructive, require skilled personnel to perform, making them impossible large-scale nondestructive screening detection, real-time, on-site analysis. Therefore, the potential of visible-near-infrared (Vis-NIR) spectroscopy over 400-2500 nm spectral range was examined determination infection corresponding on corn kernels in a rapid manner. The two A. flavus strains, AF13...

<title>Abstract</title> Small scale research or individual seed cotton samples from breeders and geneticists are ginned using laboratory saw roller gins. The objective of this study was to examine the effects two different ginning (SG) rates subsequent mechanical blending on fiber high volume instrument (HVI) advanced information system (AFIS) quality measurement. Seed cottons diverse Upland cultivars, years, locations were evaluated. As SG rate increased, HVI results for uniformity index...

Cotton micronaire (MIC) is an essential fiber quality index that characterizes both maturity and fineness components. This study compared how MIC affects the high volume instrument (HVI) advanced information system (AFIS) qualities between Deltapine® PhytoGen upland varieties. There were noticeable differences among HVI AFIS from samples samples, with significant om strength elongation. development benefited enhancement also short (SFI), neps, contents, immature content (IFC) reduction, all...

This paper demonstrates the potential of generalized two-dimensional (2D) Fourier transform (FT) infrared (IR) and near-infrared (NIR) correlation spectroscopy in studies temperature-dependent spectral variations self-associated molecules. Three examples 2D analysis are discussed this paper. The first two concerned with IR NIR changes N-methylacetamide (NMA) pure liquid state. approach revealed that almost all peaks NMA 3400–1100-cm −1 region consist to four separate bands. For example,...

Generalized two-dimensional (2D) correlation spectroscopy has been applied to the near-infrared (NIR) region investigate temperature-dependent spectral variations of N-methylacetamide (NMA) in pure liquid state. The 2D NIR approach clearly reveals that there are at least five bands 6800−6050 cm-1 region. These 6790, 6650, 6510, 6440, and 6250 assigned, respectively, first overtones stretching modes free NH group monomer, terminal-free (free-end) groups dimer oligomers, hydrogen-bonded...

This paper reports two-dimensional Fourier-transform infrared (2D FT IR) correlation spectroscopy study of temperature-dependent spectral variations N-methylacetamide (NMA) in the pure liquid. The 2D spectroscopic analysis has demonstrated that amide I band NMA consists at least four distinct bands 1685, 1665, 1650, and 1635 cm-1. signs asynchronous cross peaks corresponding to these have shown sequence intensity change ascending order temperature is given by cm-1 < 1650 1665 1685 These...

Surface-enhanced Raman (SERS) spectra of various batches bacteria adsorbed on silver colloidal nanoparticles were collected to explore the potential SERS technique for rapid and routine identification E. coli L. monocytogenes cultures. Relative standard deviation (RSD) from suspensions ratios peaks small molecules (K(3)PO(4)) used evaluate reproducibility, stability, binding effectiveness citrate-reduced colloids over batch storage processes. The results suggested consistent reproducibility...

Fourier transform infrared (FTIR) spectra of seed and lint cottons were collected to explore the potential for discrimination immature from mature ones also determination actual cotton maturity. Spectral features revealed large differences in 900—1200 cm 1 region, such spectral distinctions formed basis on which develop a simple three-band ratio algorithm classification analysis. Next, an additional formula was created assess degree fiber maturity by converting ratios into appropriate FTIR...

Silver nanowires (AgNWs) are being widely utilized in an increasing number of consumer products, which could release silver to aquatic environments during the use or washing process, and have received growing concerns on their potential risks bio-organisms humans. The present study demonstrated that AgNWs mainly experienced direct oxysulfidation by reacting with dissolved sulfide species (initial S2- concentration at 1.6 mg/L) produce nanostructures under environmentally relevant conditions....

This paper reports the generalized two-dimensional (2D) visible/near-infrared (Vis/NIR) correlation spectroscopy study of chicken meats in cold storage. The 2D visible analysis revealed that, besides previously reported three absorption bands around 445, 485, and 560 nm ascribed to DeoxyMb, MetMb, OxyMb, there is an additional band 635 that could be assigned SulfMb, a product from reaction myoglobin with H2S generated by bacteria. Unlike spectral intensity reduction 440 bands, intensities...