Preliminary Studies on the Absorbance Ratio Method Used to Determining the Age of Stamp‐pad Ink Seal

2019 ◽  
Vol 64 (4) ◽  
pp. 1203-1212
Author(s):  
Guoliang Ouyang ◽  
Biao Li ◽  
Pengnan Zhao ◽  
Xingfei Guo ◽  
Changliang Wang
Keyword(s):  
Ratio Method ◽  
Absorbance Ratio

scholarly journals ULTRAVIOLET SPECTROSCOPY AND ITS PHARMACEUTICAL APPLICATIONS- A BRIEF REVIEW

2018 ◽  
Vol 11 (2) ◽  
pp. 59 ◽  
Author(s):  
Dipali M Atole ◽  
Hrishikesh H Rajput
Keyword(s):  
Simultaneous Equation ◽  
Ratio Method ◽  
Isosbestic Point ◽  
Complex Matrix ◽  
Spectrophotometric Methods ◽  
Factor Method ◽  
Absorbance Ratio ◽  
Present Information ◽  
Different Types ◽  
Absorbance Difference

 Rapid and easy analytical methods are needed due to increasing number of multicomponent formulations, biotherapeutic products and samples of complex matrix in que. Number of Ultraviolet (UV) spectrophotometric methods used for these purpose. Different types of UV spectrometric methods developed on the basis of principle of additivity, absorbance difference, processing absorption spectra. The aim of this review is to present information on simultaneous equation method, difference spectrophotometry, derivative spectrophotometry, absorbance ratio spectra, derivative ratio spectra, successive ratio - derivative spectra, Q-absorbance ratio method, absorptivity factor method, dual wavelength method, absorption factor method, multivariate chemometric methods, and isosbestic point method. A brief summary on theories, mathematical background and some applications of these methods are presented here.

Unveiling heme proteins conformational stability through a UV absorbance ratio method

2007 ◽  
Vol 371 (2) ◽  
pp. 253-255 ◽  
Author(s):  
Luis M.A. Oliveira ◽  
Carlos Cordeiro ◽  
Ana Ponces Freire ◽  
Carla Ascenso ◽  
Alexandre Quintas
Keyword(s):  
Heme Proteins ◽  
Conformational Stability ◽  
Ratio Method ◽  
Uv Absorbance ◽  
Absorbance Ratio

scholarly journals Precision and accuracy of determination in the absorbance ratio method

1969 ◽  
Vol 18 (4) ◽  
pp. 446-454 ◽  
Author(s):  
Bunzo TAMURA ◽  
Ikuyo FURUYAMA ◽  
Kazuyuki MORIURA ◽  
Sumio KATAYAMA
Keyword(s):  
Ratio Method ◽  
Absorbance Ratio ◽  
Precision And Accuracy

Spectroscopic Determination of Aspirin and Omeprazole by Absorbance Ratio and Multicomponent Mode Method

2017 ◽  
Vol 10 (6) ◽  
pp. 3900-3905
Author(s):  
Hajera Khan ◽  
Swapna S Bandewar ◽  
Mohammad Zameeruddin ◽  
Vishvanath B Bharkad
Keyword(s):  
Accurate Method ◽  
Analysis Data ◽  
Spectroscopic Determination ◽  
Ratio Method ◽  
Analysis Method ◽  
Isobestic Point ◽  
Absorbance Ratio ◽  
Ich Guidelines ◽  
Mode Method

Here we describe a simple, rapid and accurate method for simultaneous assay of aspirin and omeprazole. The first method was Absorbance ratio method (Method 1) and second method was multi component mode method of analysis (Method 2).  Methanol: water (8:2) was used as solvent for both methods, using 293 nm as isobestic point for absorbance ratio method. The wavelength ranges 275.80 nm for aspirin and 302.20 nm for omeprazole for method 2, which represents the absorbance maxima of both drugs respectively. Beer’s law was applied in the concentration ranges of 2-14μg/mL and 2-18 μg/mL for aspirin and omeprazole, respectively, in absorbance ratio methods. The percentage assay was found to be in the range 99.74 to 100 % for aspirin and 99.69 to 99.9 % for omeprazole for both the methods. Recovery was found in the range of 99.74 –100.14 % for aspirin and omeprazole for both methods. The analysis data has been validated statistically and recovery studies confirmed the accuracy and reproducibility of the proposed methods, which were carried out according to the ICH guidelines.     

scholarly journals Quantitative determination of weak acids, weak bases and their salts by the absorbance ratio method

1968 ◽  
Vol 17 (6) ◽  
pp. 683-703
Author(s):  
Bunzo TAMURA ◽  
Ikuyo FURUYAMA ◽  
Kazuyuki MORIURA
Keyword(s):  
Quantitative Determination ◽  
Ratio Method ◽  
Weak Acids ◽  
Weak Bases ◽  
Absorbance Ratio
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