Fundamentals of Fourier Transform Infrared Spectroscopy

Smith, Brian C.

doi:10.1201/b10777

Cited by 713 publications

(633 citation statements)

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“…40 The lower precision of the ATR-IR method is likely associated with the variability in sample dryness for each replicate, and to the low number of ATR-IR scans (32 scans), as compared to the TIR method (512 scans). 44,46 Both IR-based analytical methods showed excellent specificity and good sensitivity, equivalent to or better than most methods previously reported to assess dairy calves for FTPI. 24,47,48 Both methods correctly identified the majority of FTPI cases, and the misclassified samples had RID IgG concentrations very close to the diagnostic cutoff of 10 g/L.…”

Section: Discussionmentioning

confidence: 99%

“…46 ATR-IR spectroscopy measures the changes that occur in a totally internally reflected IR beam when the beam comes into contact with a sample. 44 ATR-IR has the advantage of reduced sample preparation time, and is relatively impervious to variations in sample thickness compared to TIR, making collection of high-quality spectra easier. 30,44,46 The objective of our study was to investigate the utility of previously built partial least squares (PLS) models for quantifying IgG for a new set of samples and to compare the performance of TIR and ATR-IR spectroscopic approaches (in combination with multivariate analysis) as the basis to predict IgG levels in bovine serum, and to identify FTPI in dairy calves.…”

Section: Introductionmentioning

confidence: 99%

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Quantification of bovine immunoglobulin G using transmission and attenuated total reflectance infrared spectroscopy

et al. 2015

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Abstract. In this study, we evaluated and compared the performance of transmission and attenuated total reflectance (ATR) infrared (IR) spectroscopic methods (in combination with quantification algorithms previously developed using partial least squares regression) for the rapid measurement of bovine serum immunoglobulin G (IgG) concentration, and detection of failure of transfer of passive immunity (FTPI) in dairy calves. Serum samples (n = 200) were collected from Holstein calves 1-11 days of age. Serum IgG concentrations were measured by the reference method of radial immunodiffusion (RID) assay, transmission IR (TIR) and ATR-IR spectroscopy-based assays. The mean IgG concentration measured by RID was 17.22 g/L (SD ±9.60). The mean IgG concentrations predicted by TIR and ATR-IR spectroscopy methods were 15.60 g/L (SD ±8.15) and 15.94 g/L (SD ±8.66), respectively. RID IgG concentrations were positively correlated with IgG levels predicted by TIR (r = 0.94) and ATR-IR (r = 0.92). The correlation between 2 IR spectroscopic methods was 0.94. Using an IgG concentration <10 g/L as the cut-point for FTPI cases, the overall agreement between TIR and ATR-IR methods was 94%, with a corresponding kappa value of 0.84. The sensitivity, specificity, positive predictive value, negative predictive value, and accuracy for identifying FTPI by TIR were 0.87, 0.97, 0.91, 0.95, and 0.94, respectively. Corresponding values for ATR-IR were 0.87, 0.95, 0.86, 0.95, and 0.93, respectively. Both TIR and ATR-IR spectroscopic approaches can be used for rapid quantification of IgG level in neonatal bovine serum and for diagnosis of FTPI in dairy calves.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Quantification of bovine immunoglobulin G using transmission and attenuated total reflectance infrared spectroscopy

et al. 2015

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“…The broad peaks ranging from 436 to 653 cm -1 were observed in all samples and assigned to the vibration of Ti-O and Ti-O-Ti group (Bezrodna et al 2004). Errant peaks were observed around 2350 cm -1 , which were due to the interference of CO 2 in the atmosphere (Smith 2011). The graph showed successful functionalization of SO 4 2-ions in sample 500, 600, 700-w samples indicating peaks observed at 1135 and 1040 cm -1 due to the vibration of O=S=O and Ti-O-S which is consistent with the reported works, whereby the SO 4 2-groups functionalized via incorporation into the lattice structure of TiO 2 (Yang et al 2012).…”

Section: Resultsmentioning

confidence: 97%

Synthesis of ammonium and sulfate ion-functionalized titanium dioxide for photocatalytic applications

Cheng

Miao

et al. 2017

Appl Nanosci

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Due to high band gap energy the optimum photocatalytic activities can only be achieved under UV light, thus limiting the practical application of TiO 2 . In this study, a method combining NH 4? /SO 4 2--functionalization technique and post-treatment was developed and successfully applied to synthesize photoactive TiO 2 samples which showed higher photocatalytic activity than the commercial P25 TiO 2 under visible light radiation. The results also showed that the addition of (NH 4 ) 2 SO 4 surface functionalization on TiO 2 increased the photocatalytic activity, which could be due to the combined effect of crystallinity and band gap energies. Moreover, the results showed that calcination temperature was inversely proportional to photocatalytic activity. The degradation efficiency for methylene blue under visible light was improved by *2 times from 10.7% for P25 nano Degussa TiO 2 to 20.2% for the synthesized sample. The band gap energies were also reduced from 3.7 to 3.4 eV (under UV-Vis direct transition mode) indicating a red shift towards higher wavelength.

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“…These A values and the particle mass concentration, C m , obtained from the filter samplers were then used to calculate the σ m value on the basis of Beer's law, which relates the optical measurement to the C m of the obscurant [Smith (1996)]:…”

Section: Methodsmentioning

confidence: 99%

Infrared Extinction Properties of Nanostructured and Conventional Particles

Pjesky

Maghirang

2012

Particulate Science and Technology

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Brass flakes and carbon-based particulates are effective obscurants in the infrared (IR) region of the electromagnetic spectrum; however, they are toxic and can cause respiratory problems and environmental concerns. There is a need to develop or identify nontoxic IR obscurants. This research was conducted to determine the potential of nanostructured particles as IR obscurants. Three commercial nanostructured particles were compared with two conventional particles and common obscurants. Experiments involved dispersing a known mass of particles into a particle chamber and measuring the IR transmission through the chamber with a Fourier transform infrared analyzer and the mass concentration with filter samplers. The size distribution of the aerosolized particles was also measured with an aerodynamic particle sizer spectrometer.From the measured data, the mean values of the mass extinction coefficient, σ m , and volume extinction coefficient, σ v , for the spectral bands of interest (i.e., 3 to 5 µm and 8 to 12 µm) were calculated. Results showed that ISO fine test dust, NaHCO 3 and NanoActive ® TiO 2 (for 3 to 5 m) appeared to be the most promising alternatives to brass or graphite flakes. By manipulating the size and/or morphology of these particles, it might be possible to enhance their IR extinction performance.

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Fundamentals of Fourier Transform Infrared Spectroscopy

Cited by 713 publications

References 0 publications

Quantification of bovine immunoglobulin G using transmission and attenuated total reflectance infrared spectroscopy

Quantification of bovine immunoglobulin G using transmission and attenuated total reflectance infrared spectroscopy

Synthesis of ammonium and sulfate ion-functionalized titanium dioxide for photocatalytic applications

Infrared Extinction Properties of Nanostructured and Conventional Particles

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