E-ISSN 2063-5346
 

Research Article 
ECB. 2017; 6(8): 355-358


SPECTROPHOTOMETRIC DETERMINATION OF THE IONIZATION CONSTANTS OF METHIONINE, CYSTINE AND CYSTEINE

Hamad M. Adress Hasan, Ibrahim H. Habib, Ahlam M. Ali.

Abstract
A simple, rapid and sensitive method has been applied on three amino acids viz., methionine, cystine and cysteine, to estimate the ionization constant. Spectrophotometric measurements were carried out on the absorbance of each amino acid at different pH values. The results showed that the cystine and cysteine have one pKa, while the methionine gave two different pKa values by using this method.

Key words: amino acids, ionization constant, spectrophotometry, cystine, cysteine, methionine.


 
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How to Cite this Article
Pubmed Style

Hamad M. Adress Hasan, Ibrahim H. Habib, Ahlam M. Ali. SPECTROPHOTOMETRIC DETERMINATION OF THE IONIZATION CONSTANTS OF METHIONINE, CYSTINE AND CYSTEINE. ECB. 2017; 6(8): 355-358.


Web Style

Hamad M. Adress Hasan, Ibrahim H. Habib, Ahlam M. Ali. SPECTROPHOTOMETRIC DETERMINATION OF THE IONIZATION CONSTANTS OF METHIONINE, CYSTINE AND CYSTEINE. https://www.eurchembull.com/?mno=42879 [Access: January 21, 2023].


AMA (American Medical Association) Style

Hamad M. Adress Hasan, Ibrahim H. Habib, Ahlam M. Ali. SPECTROPHOTOMETRIC DETERMINATION OF THE IONIZATION CONSTANTS OF METHIONINE, CYSTINE AND CYSTEINE. ECB. 2017; 6(8): 355-358.



Vancouver/ICMJE Style

Hamad M. Adress Hasan, Ibrahim H. Habib, Ahlam M. Ali. SPECTROPHOTOMETRIC DETERMINATION OF THE IONIZATION CONSTANTS OF METHIONINE, CYSTINE AND CYSTEINE. ECB. (2017), [cited January 21, 2023]; 6(8): 355-358.



Harvard Style

Hamad M. Adress Hasan, Ibrahim H. Habib, Ahlam M. Ali (2017) SPECTROPHOTOMETRIC DETERMINATION OF THE IONIZATION CONSTANTS OF METHIONINE, CYSTINE AND CYSTEINE. ECB, 6 (8), 355-358.



Turabian Style

Hamad M. Adress Hasan, Ibrahim H. Habib, Ahlam M. Ali. 2017. SPECTROPHOTOMETRIC DETERMINATION OF THE IONIZATION CONSTANTS OF METHIONINE, CYSTINE AND CYSTEINE. European Chemical Bulletin, 6 (8), 355-358.



Chicago Style

Hamad M. Adress Hasan, Ibrahim H. Habib, Ahlam M. Ali. "SPECTROPHOTOMETRIC DETERMINATION OF THE IONIZATION CONSTANTS OF METHIONINE, CYSTINE AND CYSTEINE." European Chemical Bulletin 6 (2017), 355-358.



MLA (The Modern Language Association) Style

Hamad M. Adress Hasan, Ibrahim H. Habib, Ahlam M. Ali. "SPECTROPHOTOMETRIC DETERMINATION OF THE IONIZATION CONSTANTS OF METHIONINE, CYSTINE AND CYSTEINE." European Chemical Bulletin 6.8 (2017), 355-358. Print.



APA (American Psychological Association) Style

Hamad M. Adress Hasan, Ibrahim H. Habib, Ahlam M. Ali (2017) SPECTROPHOTOMETRIC DETERMINATION OF THE IONIZATION CONSTANTS OF METHIONINE, CYSTINE AND CYSTEINE. European Chemical Bulletin, 6 (8), 355-358.