Isolation, identification, thermal analysis, DFT calculations and antioxidant activity studies of lichen metabolites norstictic acid and evernic acid Abstract
Zayed, M., Manojlovic, N. (2020). Isolation, identification, thermal analysis, DFT calculations and antioxidant activity studies of lichen metabolites norstictic acid and evernic acid Abstract. EKB Journal Management System, 63(11), 4589-4605. doi: 10.21608/ejchem.2020.28473.2611
mohamed A. Zayed; Nedeljko T Manojlovic. "Isolation, identification, thermal analysis, DFT calculations and antioxidant activity studies of lichen metabolites norstictic acid and evernic acid Abstract". EKB Journal Management System, 63, 11, 2020, 4589-4605. doi: 10.21608/ejchem.2020.28473.2611
Zayed, M., Manojlovic, N. (2020). 'Isolation, identification, thermal analysis, DFT calculations and antioxidant activity studies of lichen metabolites norstictic acid and evernic acid Abstract', EKB Journal Management System, 63(11), pp. 4589-4605. doi: 10.21608/ejchem.2020.28473.2611
Zayed, M., Manojlovic, N. Isolation, identification, thermal analysis, DFT calculations and antioxidant activity studies of lichen metabolites norstictic acid and evernic acid Abstract. EKB Journal Management System, 2020; 63(11): 4589-4605. doi: 10.21608/ejchem.2020.28473.2611

Isolation, identification, thermal analysis, DFT calculations and antioxidant activity studies of lichen metabolites norstictic acid and evernic acid Abstract

Egyptian Journal of Chemistry
Article 37, Volume 63, Issue 11, November 2020, Page 4589-4605  XML PDF (1.58 MB)
Document Type: Original Article
DOI: 10.21608/ejchem.2020.28473.2611
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Authors
mohamed A. Zayed email orcid 1; Nedeljko T Manojlovic2
1Department of chemistry, Faculty of Science, Cairo University (D.Sc. Anal.Chem.)
2Professor Medical Faculty, University of Kragujevac, Svetozara Markovica 69, 34000 Kragujevac, Serbia Phone: 034 306 800 ext. 226 Fax: 034 306 800 E-mail: ntm@kg.ac.rs Web: www.medf.kg.ac.yu
Abstract
This manuscript deals with successful trials to isolate two lichen acids (Noristicic and Everinic acids) from natural sources. The isolated compounds were purified, crystallized from suitable solvent, and their melting points were measured. Their structures were identified by elemental analyses, spectroscopic tools (Electronic spectra, FT-IR, Mass), and finally using thermal analyses (TG, DTG and DTA). Their thermal fragmentation pathways were compared with mass fragmentation. These fragmentation pathways were compared with the theoretical molecular orbital calculations (DFT- MOCs). The molecular structures of the title compounds in the ground state were optimized by a DFT method using B3LYP functional combined with 6-311G** (d) basis set. Calculations were carried out using GAUSSIAN 09 suite of programs. In addition, antioxidant activity of norstictic acid and everinic acid were determined. The results showed that both compounds exhibited antioxidant activity, but that the norstictic acid showed several times higher activity than evernic acid. This study refers to successful obtaining of these biologically active acids from natural sources and of wide biomedical applications.
Keywords
Key words: Isolation; Norstictic acid; Evernic acid; Spectroscopic studies; Thermal Analyses; DFT-MOCs; Biological Activities
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