APPLICATION OF MULTIVARIATE CALIBRATION AND DERIVATIVE ANALYSIS IN THE SPECTROPHOTOMETRIC DETERMINATION OF SOME ASCORBIC ACID PHARMACEUTICAL MIXTURES

2004 ◽  
Vol 27 (2) ◽  
pp. 269-280
Author(s):  
Ibrahim Refaat
Keyword(s):  
Ascorbic Acid ◽  
Spectrophotometric Determination ◽  
Multivariate Calibration ◽  
Derivative Analysis

scholarly journals Spectrophotometric determination of ascorbic acid in grapes with the Prussian Blue reaction

2012 ◽  
Vol 23 (2) ◽  
pp. 174-179 ◽  
Author(s):  
Nicoleta Matei ◽  
Simona Dobrinas ◽  
Gabriel Lucian Radu
Keyword(s):  
Ascorbic Acid ◽  
Vitamin C ◽  
Vitis Vinifera ◽  
Prussian Blue ◽  
Spectrophotometric Determination ◽  
Pinot Noir ◽  
Cabernet Sauvignon ◽  
Red Grapes ◽  
Blue Reaction

AbstractThe objective of the present work was to adapt the Prussian Blue reaction for the determination of ascorbic acid. The procedure was successfully applied for the determination of ascorbic acid in red and white grapes (Vitis vinifera L.) just previous ingathering. In the present work was used the red and white grapes from Murfatlar vineyard: Mamaia, Cabernet Sauvignon, Merlot, Pinot Noir, Chardonnay, Sauvignon, Muscat Ottonel and Riesling Italian. The results were situated in the range of 0.67 - 1.79 mg vitamin C/100g product for red grapes and respectively 0.50 - 1.49 mg vitamin C/100g for white grapes.

Electrochemical Studies of an Iron Porphyrin Immobilized on Nb2O5/SiO2 and Its Application for Simultaneous Determination of Dopamine and Ascorbic Acid Using Multivariate Calibration Methodology

2007 ◽  
Vol 19 (24) ◽  
pp. 2543-2550 ◽  
Author(s):  
Tatiane Skeika ◽  
Crislaine Marcovicz ◽  
Shirley Nakagaki ◽  
Sérgio Toshio Fujiwara ◽  
Karen Wohnrath ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Simultaneous Determination ◽  
Multivariate Calibration ◽  
Iron Porphyrin ◽  
Electrochemical Studies

scholarly journals Spectrophotometric determination of phenol in the presence of congeners by multivariated calibration

2001 ◽  
Vol 73 (4) ◽  
pp. 519-524 ◽  
Author(s):  
KELY VIVIANE DE SOUZA ◽  
PATRICIO PERALTA-ZAMORA
Keyword(s):  
Spectrophotometric Determination ◽  
Multivariate Calibration ◽  
Close Correlation ◽  
Degradation Process ◽  
Partial Least Square ◽  
Least Square ◽  
Partial Least Square Regression ◽  
Calibration Model ◽  
Transient Species

The generation of poly-hydroxilated transient species during the photochemical treatment of phenol usually impedes the spectrophotmetric monitoring of its degradation process. Frequently, the appearance of compounds such as pyrocatechol, hydroquinone and benzoquinone produces serious spectral interference, which hinder the use of the classical univariate calibration process. In this work, the use of multivariate calibration is proposed to permit the spectrophotometric determination of phenol in the presence of these intermediates. Using 20 synthetic mixtures containing phenol and the interferents, a calibration model was developed by using a partial least square regression process (PLSR) and processing the absorbance signal between 180 and 300 nm. The model was validated by using 3 synthetic mixtures. In this operation, typical errors lower than 3% were observed. Close correlation between the results obtained by liquid chromatography and the proposed method was also observed.

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