scholarly journals Evaluation of Sudanese Phosphate Rocks by two Rapid Methods for Determination of Total and Available Phosphorus: Comparative Study

2016 ◽  
Vol 32 (5) ◽  
pp. 2503-2507
Author(s):  
Adam Farah ◽  
Salah Nour ◽  
Alassam Ahmed ◽  
H. Bayahia
Keyword(s):  
Comparative Study ◽  
Available Phosphorus ◽  
Phosphate Rocks ◽  
Rapid Methods

Determination of Pyridostigmine Bromide in Presence of its Related Impurities by Four Modified Classical Least Square Based Models: A Comparative Study

2020 ◽  
Vol 17 (1) ◽  
pp. 87-94
Author(s):  
Ibrahim A. Naguib ◽  
Fatma F. Abdallah ◽  
Aml A. Emam ◽  
Eglal A. Abdelaleem
Keyword(s):  
Comparative Study ◽  
Least Squares ◽  
Orthogonal Projection ◽  
Predictive Ability ◽  
Least Square ◽  
Projection To Latent Structures ◽  
Preprocessing Method ◽  
Spectral Residual ◽  
Latent Structures

: Quantitative determination of pyridostigmine bromide in the presence of its two related substances; impurity A and impurity B was considered as a case study to construct the comparison. Introduction: Novel manipulations of the well-known classical least squares multivariate calibration model were explained in detail as a comparative analytical study in this research work. In addition to the application of plain classical least squares model, two preprocessing steps were tried, where prior to modeling with classical least squares, first derivatization and orthogonal projection to latent structures were applied to produce two novel manipulations of the classical least square-based model. Moreover, spectral residual augmented classical least squares model is included in the present comparative study. Methods: 3 factor 4 level design was implemented constructing a training set of 16 mixtures with different concentrations of the studied components. To investigate the predictive ability of the studied models; a test set consisting of 9 mixtures was constructed. Results: The key performance indicator of this comparative study was the root mean square error of prediction for the independent test set mixtures, where it was found 1.367 when classical least squares applied with no preprocessing method, 1.352 when first derivative data was implemented, 0.2100 when orthogonal projection to latent structures preprocessing method was applied and 0.2747 when spectral residual augmented classical least squares was performed. Conclusion: Coupling of classical least squares model with orthogonal projection to latent structures preprocessing method produced significant improvement of the predictive ability of it.

scholarly journals Comparative study of two immunoassays used for the determination of serum vitamin D

2021 ◽  
pp. e00242
Author(s):  
Raquel Lahoz ◽  
Juan Pelegrín Sánchez ◽  
Silvia Górriz ◽  
Pilar Calmarza
Keyword(s):  
Vitamin D ◽  
Comparative Study ◽  
Serum Vitamin ◽  
Serum Vitamin D
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