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Pregled bibliografske jedinice broj: 722892

The average local ionization energy and Fukui function of L-ascorbate, the local reactivity descriptors of antioxidant reactivity


Jakobušić Brala, Cvijeta; Fabijanić, Ivana; Karković Marković, Ana; Pilepić, Viktor
The average local ionization energy and Fukui function of L-ascorbate, the local reactivity descriptors of antioxidant reactivity // Computational and theoretical chemistry, 1049 (2014), 1-6 doi:10.1016/j.comptc.2014.09.008 (međunarodna recenzija, članak, znanstveni)


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Naslov
The average local ionization energy and Fukui function of L-ascorbate, the local reactivity descriptors of antioxidant reactivity

Autori
Jakobušić Brala, Cvijeta ; Fabijanić, Ivana ; Karković Marković, Ana ; Pilepić, Viktor

Izvornik
Computational and theoretical chemistry (2210-271X) 1049 (2014); 1-6

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Antioxidant; Ascorbate; Vitamin C; Fukui function; Average local ionization energy.

Sažetak
The DFT study of electron donor reactive sites of L-ascorbate, main reactive form of vitamin C for antioxidant reactions in water medium at physiological conditions, is presented. The local reactivity descriptors, average local ionization energy Ī(r) and electron donor Fukui function fˉ(r), for ascorbate conformers were calculated using B3LYP/6-311++G** level of theory in gas-phase. The obtained results show that Ī(r) and fˉ(r) identify nearly the same reactive site toward electrophiles on ascorbate molecule. The most preferred reactive site for donating electron in reaction with radical or oxidizing molecule is associated mostly with the less electronegative C(3) atom below the gama-lactone ring plane of ascorbate. The Ī(r) and fˉ(r) obtained for ascorbate conformers suggests that the side chain conformations or intramolecular H-bonding have no significant contributions to the reactive site position in ascorbate molecule. However, the values of minimum point of average local ionization energy on electron density isosurface ĪS, min calculated for ascorbate conformers suggests that the side chain conformations and intramolecular H-bonding could have a role in modulation of antioxidant reactivity of ascorbate. The results presented in this paper show that electron donor reactive site is different from the proton donor reactive site for ascorbate. The leaving H(9) proton of hydroxyl group on ascorbate gama-lactone ring in antioxidant reaction with radical or oxidizing molecule is not associated with large fˉ(r) values or HOMO orbital suggesting that, at least in early stage of reaction, the proton and electron could be transferred from ascorbate through different orbital set what is of importance in studies of antioxidant reaction mechanisms for ascorbate.

Izvorni jezik
Engleski

Znanstvena područja
Kemija



POVEZANOST RADA


Projekti:
006-0063082-0354 - Fizikalno kemijske interakcije biomedicinski važnih prirodnih antioksidansa (Pilepić, Viktor, MZOS ) ( POIROT)

Ustanove:
Farmaceutsko-biokemijski fakultet, Zagreb

Poveznice na cjeloviti tekst rada:

doi www.sciencedirect.com

Citiraj ovu publikaciju:

Jakobušić Brala, Cvijeta; Fabijanić, Ivana; Karković Marković, Ana; Pilepić, Viktor
The average local ionization energy and Fukui function of L-ascorbate, the local reactivity descriptors of antioxidant reactivity // Computational and theoretical chemistry, 1049 (2014), 1-6 doi:10.1016/j.comptc.2014.09.008 (međunarodna recenzija, članak, znanstveni)
Jakobušić Brala, C., Fabijanić, I., Karković Marković, A. & Pilepić, V. (2014) The average local ionization energy and Fukui function of L-ascorbate, the local reactivity descriptors of antioxidant reactivity. Computational and theoretical chemistry, 1049, 1-6 doi:10.1016/j.comptc.2014.09.008.
@article{article, author = {Jakobu\v{s}i\'{c} Brala, Cvijeta and Fabijani\'{c}, Ivana and Karkovi\'{c} Markovi\'{c}, Ana and Pilepi\'{c}, Viktor}, year = {2014}, pages = {1-6}, DOI = {10.1016/j.comptc.2014.09.008}, keywords = {Antioxidant, Ascorbate, Vitamin C, Fukui function, Average local ionization energy.}, journal = {Computational and theoretical chemistry}, doi = {10.1016/j.comptc.2014.09.008}, volume = {1049}, issn = {2210-271X}, title = {The average local ionization energy and Fukui function of L-ascorbate, the local reactivity descriptors of antioxidant reactivity}, keyword = {Antioxidant, Ascorbate, Vitamin C, Fukui function, Average local ionization energy.} }
@article{article, author = {Jakobu\v{s}i\'{c} Brala, Cvijeta and Fabijani\'{c}, Ivana and Karkovi\'{c} Markovi\'{c}, Ana and Pilepi\'{c}, Viktor}, year = {2014}, pages = {1-6}, DOI = {10.1016/j.comptc.2014.09.008}, keywords = {Antioxidant, Ascorbate, Vitamin C, Fukui function, Average local ionization energy.}, journal = {Computational and theoretical chemistry}, doi = {10.1016/j.comptc.2014.09.008}, volume = {1049}, issn = {2210-271X}, title = {The average local ionization energy and Fukui function of L-ascorbate, the local reactivity descriptors of antioxidant reactivity}, keyword = {Antioxidant, Ascorbate, Vitamin C, Fukui function, Average local ionization energy.} }

Časopis indeksira:


  • Current Contents Connect (CCC)
  • Web of Science Core Collection (WoSCC)
    • Science Citation Index Expanded (SCI-EXP)
    • SCI-EXP, SSCI i/ili A&HCI
  • Scopus


Citati:





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