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Title:Pinocembrin iz medu kot potencialni lovilec kemijskih karcinogenov - računalniški pristop : diplomsko delo visokošolskega strokovnega študijskega programa I. stopnje
Authors:ID Vtič, Urška (Author)
ID Bren, Urban (Mentor) More about this mentor... New window
ID Furlan, Veronika (Comentor)
Files:.pdf VS_Vtic_Urska_2021.pdf (2,38 MB)
MD5: BB0EDFA21EB853047EAA97F3B4F0C6DA
PID: 20.500.12556/dkum/c68bb5d0-d077-427e-9579-63ca11f9423a
 
Language:Slovenian
Work type:Bachelor thesis/paper
Typology:2.11 - Undergraduate Thesis
Organization:FKKT - Faculty of Chemistry and Chemical Engineering
Abstract:V diplomskem delu smo preučevali pinocembrin iz medu v vlogi lovilca končnih kemijskih karcinogenov s pomočjo kvantnomehanskih simulacij. Obravnavali smo devet končnih kemijskih karcinogenov: 2-cianoetilen oksid, aflatoksin B1-ekso-8,9-epoksid, β-propiolakton, etilen oksid, kloroetilen oksid, glicidamid, propilen oksid, stiren oksid in vinil karbamat epoksid. S pomočjo kvantnomehanskih simulacij z metodo Hartree-Fock, ki smo jih izvedli s programom Gaussian 09 na gruči računalnikov VRANA, smo izračunali aktivacijske proste energije pri treh različnih fleksibilnih baznih setih HF/6-31G(d), HF/6-31+G(d,p) in HF/6-311++G(d,p), ob uporabi dveh različnih modelov implicitnih topil. Grafični rezultati dokazujejo, da reakcije alkilacije med pinocembrinom in devetimi končnimi kemijskimi karcinogeni potekajo po mehanizmu nukleofilne substitucije SN2. Aktivacijske proste energije za reakcije alkilacije med kemijskimi karcinogeni in pinocembrinom, pridobljene po solvatacijskih metodah Samouglašenega reakcijskega polja in Langevinovih dipolov, pa smo primerjali z eksperimentalnimi vrednostmi aktivacijskih prostih energij med identičnimi karcinogeni in gvaninom - najreaktivnejšo bazo DNK. Na podlagi primerjave z gvaninom smo lahko določili, kako dober lovilec kemijskih karcinogenov je pinocembrin. Ugotovili smo, da pinocembrin predstavlja enakovredno učinkovit lovilec kemijskih karcinogenov v primeru etilen oksida, kloroetilen oksida in glicidamida kot gvanin, saj so izračunane aktivacijske energije podobne eksperimentalnim vrednostim za reakcije z gvaninom. V primeru 2-cianoetilen oksida, AFB1 ekso-8,9-epoksida, propilen oksida in stiren oksida pa pinocembrin ne more učinkovito zaščititi našega dednega materiala, saj je aktivacijska prosta energija pri omenjenih karcinogenih višja od eksperimentalno določene vrednosti za reakcije teh karcinogenov z gvaninom. Pinocembrin predstavlja bolj učinkovit lovilec le v primeru β-propiolaktona in vinil karbamat epoksida, kjer sta bili aktivacijski prosti energiji nižji kot v primeru reakcije z gvaninom.
Keywords:pinocembrin, med, flavonoidi, kemijski karcinogeni, aktivacijska prosta energija, kvantnomehanski izračuni
Place of publishing:Maribor
Place of performance:Maribor
Publisher:[U. Vtič]
Year of publishing:2021
Number of pages:X, 28 str.
PID:20.500.12556/DKUM-80135 New window
UDC:615.277.041(043.2)
COBISS.SI-ID:77928195 New window
Publication date in DKUM:22.09.2021
Views:942
Downloads:120
Metadata:XML DC-XML DC-RDF
Categories:KTFMB - FKKT
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Licences

License:CC BY-SA 4.0, Creative Commons Attribution-ShareAlike 4.0 International
Link:http://creativecommons.org/licenses/by-sa/4.0/
Description:This Creative Commons license is very similar to the regular Attribution license, but requires the release of all derivative works under this same license.
Licensing start date:31.08.2021

Secondary language

Language:English
Title:Pinocembrin from honey as a potential scavenger of chemical carcinogens - a computational approach
Abstract:In this diploma thesis we studied pinocembrin in the role of a scavenger of chemical carcinogens with the help of quantum mechanical simulations. For the simulations the following nine ultimate chemical carcinogen were used: 2-cyanoethylene oxide, aflatoxin B1-exo-8,9-epoxide, β-propiolactone, ethylene oxide, chloroethylene oxide, glycidamide, propylene oxide, styrene oxide and vinyl carbamate epoxide. With the quantum mechanical simulations at the Hartree-Fock level of theory, performed with the program Gaussian 09 on the computer cluster VRANA, we calculated the activation free energies using three different flexible basis sets: HF/6-31G(d), HF/6-31+G(d,p) and HF/6-311++G(d,p) in conjunction with two different implicit solvation models. The results in the form of images prove that the alkylation reactions between pinocembrin and ultimate chemical carcinogens follow the mechanism of nucleophilic substitution SN2. The activation free energies obtained by the solvation models Self-Consistent Reaction Field and Langevin Dipoles were compared with the experimental values of the activation free energies between identical chemical carcinogens and guanine, which represents the most reactive DNA base. Based on the comparison with guanine, we were able to determine just how efficient scavenger of chemical carcinogens is pinocembrin. We found that pinocembrin represents a similar scavenger of ultimate chemical carcinogens as guanine for ethylene oxide, chloroethylene oxide and glycidamide as guanine, because the calculated activation free energies were similar to the experimentally determined values for the reactions with guanine. In the case of 2-cyanoethylene oxide, aflatoxin B1-exo-8,9-epoxide, propylene oxide and styrene oxide pinocembrin cannot efficiently protect our DNA, because the activation free energies for these carcinoges were higher than the experimentally determined values for reactions with guanine. Pinocembrin represents an efficient scavenger only in the case of β-propiolactone and vinyl carbamate epoxide, where the calculated activation free energies were lower than the experimentally determined ones for reactions with guanine.
Keywords:pinocembrin, honey, flavonoids, chemical carcinogens, activation free energy, quantum mechemical calculations


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