Stoichiometry, Kinetics and Mechanism of Oxidation of L-Cysteine by Hexacyanoferrate (III) in Acidic Media
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23 - 41
Keywords
Abstract
The Stoichiometry, kinetics, and mechanism of oxidation of L-cysteine by hexacyanoferrate (III) in acidic media at constant ionic strength have been studied spectrophotometrically. A1:1 L-cysteine:hexacyanoferrate (III) has been established with 1..-cysteine as the only product. The reaction is zero order in hexacyanoferrate (III), first order in L-cysteine and inverse first in hydrogen ion concentration. The activation parameters were evaluated in the temperature range 15-40°C (Ea.# = 28.2 kJ/mol. ?S# = -192.4 J/mol. deg). The oxidation was inhibited in the presence of added hexacyanoferrate (II). The effects of other added salts and composition of the solvent have been rationalized. Two mechanisms are offered to explain the kinetic data.
Abu El-Hallow, R., Al-Subu, M. M., Abed, H. M., & Jondi, W. J. (1996). Stoichiometry, Kinetics and Mechanism of Oxidation of L-Cysteine by Hexacyanoferrate (III) in Acidic Media. An-Najah University Journal for Research - A (Natural Sciences), 10(1), 23–41. https://doi.org/10.35552/anujr.a.10.1.403
[1]R. Abu El-Hallow, M. M. Al-Subu, H. M. Abed, and W. J. Jondi, “Stoichiometry, Kinetics and Mechanism of Oxidation of L-Cysteine by Hexacyanoferrate (III) in Acidic Media,” An-Najah University Journal for Research - A (Natural Sciences), vol. 10, no. 1, pp. 23–41, Jan. 1996, doi: 10.35552/anujr.a.10.1.403.
Abu El-Hallow, Rajab, et al. “Stoichiometry, Kinetics and Mechanism of Oxidation of L-Cysteine by Hexacyanoferrate (III) in Acidic Media.” An-Najah University Journal for Research - A (Natural Sciences), vol. 10, no. 1, Jan. 1996, pp. 23–41. Crossref, https://doi.org/10.35552/anujr.a.10.1.403.
1.Abu El-Hallow R, Al-Subu MM, Abed HM, Jondi WJ. Stoichiometry, Kinetics and Mechanism of Oxidation of L-Cysteine by Hexacyanoferrate (III) in Acidic Media. An-Najah University Journal for Research - A (Natural Sciences) [Internet]. 1996 Jan;10(1):23–41. Available from: http://dx.doi.org/10.35552/anujr.a.10.1.403
Abu El-Hallow, Rajab, Mohammad M. Al-Subu, Hani M. Abed, and Waheed J. Jondi. “Stoichiometry, Kinetics and Mechanism of Oxidation of L-Cysteine by Hexacyanoferrate (III) in Acidic Media.” An-Najah University Journal for Research - A (Natural Sciences) 10, no. 1 (January 1996): 23–41. https://doi.org/10.35552/anujr.a.10.1.403.
سرعة ميكانيكية أكسدة ل.سيستين بواسطة حديدي سيانيد البوتاسيوم في وسط حامضي
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معلومات المقال
23 - 41
الكلمات الإفتتاحية
الملخص
The Stoichiometry, kinetics, and mechanism of oxidation of L-cysteine by hexacyanoferrate (III) in acidic media at constant ionic strength have been studied spectrophotometrically. A1:1 L-cysteine:hexacyanoferrate (III) has been established with 1..-cysteine as the only product. The reaction is zero order in hexacyanoferrate (III), first order in L-cysteine and inverse first in hydrogen ion concentration. The activation parameters were evaluated in the temperature range 15-40°C (Ea.# = 28.2 kJ/mol. ?S# = -192.4 J/mol. deg). The oxidation was inhibited in the presence of added hexacyanoferrate (II). The effects of other added salts and composition of the solvent have been rationalized. Two mechanisms are offered to explain the kinetic data.
Abu El-Hallow, R., Al-Subu, M. M., Abed, H. M., & Jondi, W. J. (1996). Stoichiometry, Kinetics and Mechanism of Oxidation of L-Cysteine by Hexacyanoferrate (III) in Acidic Media. An-Najah University Journal for Research - A (Natural Sciences), 10(1), 23–41. https://doi.org/10.35552/anujr.a.10.1.403
[1]R. Abu El-Hallow, M. M. Al-Subu, H. M. Abed, and W. J. Jondi, “Stoichiometry, Kinetics and Mechanism of Oxidation of L-Cysteine by Hexacyanoferrate (III) in Acidic Media,” An-Najah University Journal for Research - A (Natural Sciences), vol. 10, no. 1, pp. 23–41, Jan. 1996, doi: 10.35552/anujr.a.10.1.403.
Abu El-Hallow, Rajab, et al. “Stoichiometry, Kinetics and Mechanism of Oxidation of L-Cysteine by Hexacyanoferrate (III) in Acidic Media.” An-Najah University Journal for Research - A (Natural Sciences), vol. 10, no. 1, Jan. 1996, pp. 23–41. Crossref, https://doi.org/10.35552/anujr.a.10.1.403.
1.Abu El-Hallow R, Al-Subu MM, Abed HM, Jondi WJ. Stoichiometry, Kinetics and Mechanism of Oxidation of L-Cysteine by Hexacyanoferrate (III) in Acidic Media. An-Najah University Journal for Research - A (Natural Sciences) [Internet]. 1996 Jan;10(1):23–41. Available from: http://dx.doi.org/10.35552/anujr.a.10.1.403
Abu El-Hallow, Rajab, Mohammad M. Al-Subu, Hani M. Abed, and Waheed J. Jondi. “Stoichiometry, Kinetics and Mechanism of Oxidation of L-Cysteine by Hexacyanoferrate (III) in Acidic Media.” An-Najah University Journal for Research - A (Natural Sciences) 10, no. 1 (January 1996): 23–41. https://doi.org/10.35552/anujr.a.10.1.403.
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