Application of Absorbancy Ratios to the Analysis of Pharmaceuticals III

Yokoyama, F.; Pernarowski, M.

doi:10.1002/jps.2600501115

Cited by 12 publications

(4 citation statements)

References 3 publications

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“…The fundamental principles of ratio spectra derivative UV spectrophotometry have been described in the pioneering work of Pernarowskii (Yokoyama and Pernarowskii, 1961;Pernarowskii et al, 1961). Salinas et al (1990) and Berzas Nevado et al (1992) developed a new spectrophotometric method based on the use of the first derivative of the ratio spectra.…”

Section: Introductionmentioning

confidence: 99%

Determination of Tartrazine and Ponceau-4R in Various Food Samples by Vierordt's Method and Ratio Spectra First-Order Derivative UV Spectrophotometry

Altınöz

Toptan²

2002

Journal of Food Composition and Analysis

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Section: Introductionmentioning

confidence: 99%

Determination of Tartrazine and Ponceau-4R in Various Food Samples by Vierordt's Method and Ratio Spectra First-Order Derivative UV Spectrophotometry

Altınöz

Toptan²

2002

Journal of Food Composition and Analysis

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“…One of the most useful DS techniques, so called “ratio spectra derivative” is based on dividing the spectrum of a mixture into the standard spectra of each of the components and deriving the quotient to obtain a spectrum that is independent of the component concentration used as divisor 23. The fundamental principles of ratio spectra derivative UV spectrophotometry have been described in the pioneering work of Pernarowskii and coworker25 and Salinas et al 26…”

Section: Introductionmentioning

confidence: 99%

Combination of free‐breathing and breathhold steady‐state free precession magnetic resonance angiography for detection of coronary artery stenoses

Dewey

Teige

Schnapauff

et al. 2006

Magnetic Resonance Imaging

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Purpose:To analyze the incremental diagnostic value of a combination of two approaches (free-breathing and breathhold) vs. the sole free-breathing approach to coronary magnetic resonance angiography (CMRA) for detection of significant stenoses. Materials and Methods:Thirty patients were consecutively included in this prospective trial. CMRA was performed on a 1.5-T MR scanner (Magnetom Sonata, Siemens) using a balanced steady-state free precession (SSFP) sequence during free-breathing (2.4 ϫ 0.9 ϫ 0.7 mm 3 ). Breathholding acquisitions (3.0 ϫ 1.5 ϫ 0.7 mm 3 ) were only performed in cases in which the quality of free-breathing CMRA precluded assessment. Patients with contraindications to CMRA, claustrophobia, or nonassessable images were not excluded from the assessment of diagnostic accuracy (intention-to-diagnose design). Results:In 60% of all free-breathing coronary acquisitions the image quality was adequate for diagnostic assessment. For the remaining 40% of the cases, breathhold acquisitions were obtained. The sensitivity, specificity, nonassessable rate, and accuracy in identifying main coronary branches with significant stenoses using the combination of both breathing approaches and the free-breathing approach alone were 65% vs. 32%, 73% vs. 53%, 24% vs. 52%, and 71% vs. 46%, respectively (P Ͻ 0.001). Conclusion:In this consecutive cohort of patients, the combination of free-breathing and breathhold CMRA significantly improved diagnostic accuracy. Nevertheless, even this combination did not reach accuracies sufficient for routine clinical application.

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“…[21][22][23][24]18 One of the most useful DS techniques, so called ''ratio spectra derivative'' is based on dividing the spectrum of a mixture into the standard spectra of each of the components and deriving the quotient to obtain a spectrum that is independent of the component concentration used as divisor. 23 The fundamental principles of ratio spectra derivative UV spectrophotometry have been described in the pioneering work of Pernarowskii and coworker 25 and Salinas et al…”

Section: Introductionmentioning

confidence: 99%

Dye binary mixture formulation by means of derivative ratio spectra of the Kubelka–Munk function

Nateri

Ekrami

2010

Color Research & Application

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In this study, a new method is introduced for the determination of dye concentration in fabrics dyed with bicomponent dye mixtures. The reflectance spectra of the samples dyed with different binary mixtures of dyes were recorded between 400 and 700 nm. The obtainedspectrum of each of the components in the mixtures and the derivative spectra were calculated. The amounts of dyes were determined by measurements in suitably selected wavelengths in the acquired derivative ratio spectra. The obtained results indicate that the developed derivative ratio K S À Á spectra method is more accurate than the normal Kubelka-Munk method. The proposed derivative method is simple, accurate, and suitable for quantitative analysis of samples dyed with binary mixed shades.

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Application of Absorbancy Ratios to the Analysis of Pharmaceuticals III

Cited by 12 publications

References 3 publications

Determination of Tartrazine and Ponceau-4R in Various Food Samples by Vierordt's Method and Ratio Spectra First-Order Derivative UV Spectrophotometry

Determination of Tartrazine and Ponceau-4R in Various Food Samples by Vierordt's Method and Ratio Spectra First-Order Derivative UV Spectrophotometry

Combination of free‐breathing and breathhold steady‐state free precession magnetic resonance angiography for detection of coronary artery stenoses

Dye binary mixture formulation by means of derivative ratio spectra of the Kubelka–Munk function

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