Benner
دنيا لفته الدحيدحاوي ( أستاذ مساعد )
كلية الصيدلة - صيدلة عام
[email protected]
07805057667
 
 
 
Comparative Molecular Modelling Studies of Coumarin Derivatives as Potential Antioxidant Agents
تحميل
بحث النوع:
صيدلة التخصص العام:
Ahmed Abdulamier Al-Amiery اسم الناشر:
Kawkab Y. Saour2, Dunia Lafta A-Duhaidahawi3, Yasameen Kadhum Al-Majedy1, Abdul Amir Kadhum1, Abu Bakar Mohamad4 اسماء المساعدين:
Free Radicals and Antioxidants الجهة الناشرة:
Impact Factor® as reported in the 2015 Journal Citation Reports® (Thomson Reuters, 2016): 0.831 5 Year Impact Factor® as reported in the 2015 Journal Citation Reports® (Thomson Reuters, 2016): 1.201  
2017 سنة النشر:

الخلاصة

Background: Coumarin is quite extend in plants including various vegeta- bles, flavors, foods. Coumarin has various significant medicinal activities such as anti-inflammatory, anti-oxidant, anti-viral, anti-microbial, anti-cancer and has been indicated to increase central nervous system activity. Methods: The syntheses of tailor-made coumarins, which are highly compelling for medical applications due to their structurally interesting antioxidant activity, were report in this manuscript. Coumarins were synthesized success- fully through the modification of 4-hydroxycoumarin by different reaction steps. The molecular structures of the coumarins were characterized by the Fourier transformation infrared and Nuclear magnetic resonance (NMR) spectroscopies. The antioxidant efficiency of the 4-hydroxycoumarins were evaluated by typical spectroscopic method, using radicals DPPH• and H2O2. Results: The new coumarins synthesized in this work exhibited an excellent antioxidant compared to the free vitamin C. Molecular modelling studies using DFT (Density Functional Theory) calculations showed that there is a high correlation between dipole moment, Ionization potential (IP), Electron affinity (EA), Hardness (η), Softness (S), Electro negativity (μ), energy gap, HOMO (Highest Occupied Molecular Orbital) and LUMO (Lowest Unoccupied Molecular) energies and antioxidant activity. Conclusion: New coumarin derivatives were successfully synthesized using chemical methods. The characterized of these coumarins were done by using different spectroscopic techniques (FT-IR and NMR) and micro-elemental analysis (CHNS). The antioxidant activity of these coumarins were determined by using DPPH and hydrogen peroxide assays. Results indicated that the new coumarins possess higher scavenging activity than vitamin C.