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      Finding Novel Antibiotic Substances from Medicinal Plants – Antimicrobial Properties of Nigella Sativa Directed against Multidrug-resistant Bacteria

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          Abstract

          The progressive rise in multidrug-resistant (MDR) bacterial strains poses serious problems in the treatment of infectious diseases. While the number of newly developed antimicrobial compounds has greatly fallen, the resistance of pathogens against commonly prescribed drugs is further increasing. This rise in resistance illustrates the need for developing novel therapeutic and preventive antimicrobial options. The medicinal herb Nigella sativa and its derivatives constitute promising candidates. In a comprehensive literature survey (using the PubMed data base), we searched for publications on the antimicrobial effects of N. sativa particularly directed against MDR bacterial strains. In vitro studies published between 2000 and 2015 revealed that N. sativa exerted potent antibacterial effects against both Gram-positive and Gram-negative species including resistant strains. For instance, N. sativa inhibited the growth of bacteria causing significant gastrointestinal morbidity such as Salmonella, Helicobacter pylori, and Escherichia coli. However, Listeria monocytogenes and Pseudomonas aeruginosa displayed resistance against black cumin seed extracts. In conclusion, our literature survey revealed potent antimicrobial properties of N. sativa against MDR strains in vitro that should be further investigated in order to develop novel therapeutic perspectives for combating infectious diseases particularly caused by MDR strains.

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          Antioxidant activity of Nigella sativa essential oil.

          M Burits, F Bucar (2000)
          The essential oil of black cumin seeds, Nigella sativa L., was tested for a possible antioxidant activity. A rapid evaluation for antioxidants, using two TLC screening methods, showed that thymoquinone and the components carvacrol, t-anethole and 4-terpineol demonstrated respectable radical scavenging property. These four constituents and the essential oil possessed variable antioxidant activity when tested in the diphenylpicrylhydracyl assay for non-specific hydrogen atom or electron donating activity. They were also effective.OH radical scavenging agents in the assay for non-enzymatic lipid peroxidation in liposomes and the deoxyribose degradation assay. GC-MS analysis of the essential oil obtained from six different samples of Nigella sativa seeds and from a commercial fixed oil showed that the qualitative composition of the volatile compounds was almost identical. Differences were mainly restricted to the quantitative composition. Copyright 2000 John Wiley & Sons, Ltd.
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            β-Lactams and β-Lactamase Inhibitors: An Overview.

            Karen Bush, Patricia Bradford (2016)
            β-Lactams are the most widely used class of antibiotics. Since the discovery of benzylpenicillin in the 1920s, thousands of new penicillin derivatives and related β-lactam classes of cephalosporins, cephamycins, monobactams, and carbapenems have been discovered. Each new class of β-lactam has been developed either to increase the spectrum of activity to include additional bacterial species or to address specific resistance mechanisms that have arisen in the targeted bacterial population. Resistance to β-lactams is primarily because of bacterially produced β-lactamase enzymes that hydrolyze the β-lactam ring, thereby inactivating the drug. The newest effort to circumvent resistance is the development of novel broad-spectrum β-lactamase inhibitors that work against many problematic β-lactamases, including cephalosporinases and serine-based carbapenemases, which severely limit therapeutic options. This work provides a comprehensive overview of β-lactam antibiotics that are currently in use, as well as a look ahead to several new compounds that are in the development pipeline.
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              Pharmacological and toxicological properties of Nigella sativa.

              B Ali, Gerald Blunden (2003)
              The seeds of Nigella sativa Linn. (Ranunculaceae), commonly known as black seed or black cumin, are used in folk (herbal) medicine all over the world for the treatment and prevention of a number of diseases and conditions that include asthma, diarrhoea and dyslipidaemia. This article reviews the main reports of the pharmacological and toxicological properties of N. sativa and its constituents. The seeds contain both fixed and essential oils, proteins, alkaloids and saponin. Much of the biological activity of the seeds has been shown to be due to thymoquinone, the major component of the essential oil, but which is also present in the fi ed oil. The pharmacological actions of the crude extracts of the seeds (and some of its active constituents, e.g. volatile oil and thymoquinone) that have been reported include protection against nephrotoxicity and hepatotoxicity induced by either disease or chemicals. The seeds/oil have antiinflammatory, analgesic, antipyretic, antimicrobial and antineoplastic activity. The oil decreases blood pressure and increases respiration. Treatment of rats with the seed extract for up to 12 weeks has been reported to induce changes in the haemogram that include an increase in both the packed cell volume (PCV) and haemoglobin (Hb), and a decrease in plasma concentrations of cholesterol, triglycerides and glucose. The seeds are characterized by a very low degree of toxicity. Two cases of contact dermatitis in two individuals have been reported following topical use. Administration of either the seed extract or its oil has been shown not to induce significant adverse effects on liver or kidney functions. It would appear that the beneficial effects of the use of the seeds and thymoquinone might be related to their cytoprotective and antioxidant actions, and to their effect on some mediators of inflammation. Copyright 2003 John Wiley & Sons, Ltd.
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                Author and article information

                Journal
                Journal ID (nlm-ta): Eur J Microbiol Immunol (Bp)
                Journal ID (iso-abbrev): Eur J Microbiol Immunol (Bp)
                Journal ID (publisher-id): EUJMI
                Title: European Journal of Microbiology & Immunology
                Publisher: Akadémiai Kiadó (Budapest )
                ISSN (Print): 2062-509X
                ISSN (Electronic): 2062-8633
                Publication date (Electronic): 16 March 2017
                Publication date Collection: March 2017
                Volume: 7
                Issue: 1
                Pages: 92-98
                Affiliations
                Department of Microbiology and Hygiene, Charité – University Medicine Berlin , Berlin, Germany
                Author notes
                * Charité – University Medicine Berlin, CC5, Department of Microbiology and Hygiene, Campus Benjamin Franklin, FEM, Garystr. 5, D-14195 Berlin, Germany; +49-30-450524318; markus.heimesaat@ 123456charite.de

                Conflict of interest

                Stefan Bereswill and Markus M. Heimesaat are Editorial Board members.

                Article
                DOI: 10.1556/1886.2017.00001
                PMC ID: 5372484
                SO-VID: 0f8a3d9a-26fb-4e11-85ad-c24bf7b416fd
                Copyright © © 2017, The Author(s)
                License:

                This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( http://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

                History
                Date received : 16 January 2017
                Date accepted : 05 February 2017
                Page count
                Figures: 1, Tables: 1, Equations: 0, References: 28, Pages: 7
                Funding
                Funding sources: There has been no source of funding.
                Categories
                Subject: Original Article

                Keywords: nigella sativa,antimicrobial effects,multidrug-resistant (mdr) bacteria,medicinal plants,phytotherapy,herbal medicine
                Data availability:
                Keywords: nigella sativa, antimicrobial effects, multidrug-resistant (mdr) bacteria, medicinal plants, phytotherapy, herbal medicine

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