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Natural Products and Their Derivatives as Potential Drugs: A Themed Issue in Honour of Prof. Gerald Blunden

A special issue of Molecules (ISSN 1420-3049). This special issue belongs to the section "Natural Products Chemistry".

Deadline for manuscript submissions: closed (1 September 2021) | Viewed by 11097

Special Issue Editors


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Guest Editor
King's College London, Institute of Pharmaceutical Science, School of Cancer & Pharmaceutical Sciences, Faculty of Life Sciences & Medicine, Franklin–Wilkins Building, London SE1 9NH, UK
Interests: discovery of novel anticancer therapies, especially those based on natural products; antibody–drug conjugates (ADCs); anticancer agents that work through a DNA-interactive mechanism
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Guest Editor
Department of Pharmaceutical Botany, Faculty of Pharmacy, Charles University, Heyrovského 1203, 500 05 Hradec Králové, Czech Republic
Interests: isolation of secondary metabolites from plants (with focus on alkaloids from Amaryllidaceae, Papaveraceae); preparation of analogues of Amaryllidaceae alkaloids; biological activity of alkaloids and their derivatives connected with potential treatment of neurodegenerative and oncological diseases
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleague,

Gerald Blunden, an Emeritus Professor of Pharmacognosy at the University of Portsmouth UK, has been an internationally renowned pioneer and authority in the fields of phytochemistry and phytomedicines with more than five decades of scientific research experience. Professor Blunden received his Bachelor and Master degrees in Pharmacy from the University of Nottingham and Ph.D. from the University of Portsmouth.

His first research publication was in 1963, and since then, he has published more than 400 scientific papers, both refereed and non-refereed, as well as being the author of various book chapters, and a joint editor of the book Seaweed Resources in Europe: Uses and Potential, published by John Wiley. Gerald supervised many research and post-doctoral students who came from all over the world, including Venezuela, Hungary, Italy, Czech Republic, Thailand, Myanmar, Nepal and China.

Professor Blunden has been awarded many distinctions, including Honorary Membership of the Hungarian Pharmaceutical Society, Honorary Professor of the Chinese Academy of Medical Sciences, the Faculty Gold Medal by the Faculty of Pharmacy, University of Szeged, Hungary, and the 650th Anniversary Medal of Charles’ University, Prague, Czech Republic.

Professor Blunden has been a member of or has chaired numerous national and international committees, including the American Society of Pharmacognosy, the Pharmacognosy Committee of the Pharmaceutical Society of Great Britain, the British Phycological Society Council, the Manpower Committee of the Royal Pharmaceutical Society of Great Britain, the Council for National Academic Awards Register (with particular reference to Pharmacy), Vice Chairman of the UK Heads of Schools of Pharmacy and the Advisory Committee to the British Pharmacopoeia Commission.

Moreover, Professor Blunden has been an editorial member or referee for over 50 scientific journals and 20 research grants around the world. In particular, the international journal Natural Product Communications has especially set up a “Gerald Blunden Award” for the best research papers and review articles published in the journal in order to honour his “innumerable contributions”. Professor Blunden was a founding editor and is currently the Honorary Editor for the journal.

It is also worth mentioning that he is a great friend of both Guest Editors.

Natural products are characterised by a wide spectrum of biological activities; some of them are already used in the therapy of different diseases and some of them are in clinical studies; thus, the potential of secondary metabolites as candidates for new drugs is indispensable. This Special Issue is focused on both original research and review articles that cover the analysis, isolation and structural elucidation of all classes of natural products. Evaluation of biological activities of novel compounds, their structure–activity relationship, preparation of semisynthetic derivatives of plant secondary metabolites and molecular mechanisms of action are welcomed.

Prof. Dr. David E. Thurston
Prof. Dr. Lucie Cahlíková
Guest Editors

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Keywords

  • Ethnobotany
  • Phytochemistry
  • Plant secondary metabolites
  • Analysis
  • Isolation
  • Structural elucidation
  • Biological activities
  • Drug discovery
  • Structure–activity relationships
  • Analogues of secondary metabolites
  • Anticancer agents
  • Antibody–drug conjugates (ADCs)

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Published Papers (3 papers)

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Research

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11 pages, 815 KiB  
Article
Dynamics of Phloridzin and Related Compounds in Four Cultivars of Apple Trees during the Vegetation Period
by Jan Táborský, Josef Sus, Jaromír Lachman, Barbora Šebková, Anežka Adamcová and Dalibor Šatínský
Molecules 2021, 26(13), 3816; https://doi.org/10.3390/molecules26133816 - 22 Jun 2021
Cited by 12 | Viewed by 3334
Abstract
Apple trees (Malus domestica Borgh) are a rich source of dihydrochalcones, phenolic acids and flavonoids. Considering the increasing demand for these phytochemicals with health-benefitting properties, the objective of this study was to evaluate the profile of the main bioactive compounds—phloridzin, phloretin, chlorogenic [...] Read more.
Apple trees (Malus domestica Borgh) are a rich source of dihydrochalcones, phenolic acids and flavonoids. Considering the increasing demand for these phytochemicals with health-benefitting properties, the objective of this study was to evaluate the profile of the main bioactive compounds—phloridzin, phloretin, chlorogenic acid and rutin—in apple tree bark, leaves, flower buds and twigs. The variety in the phenolic profiles of four apple tree cultivars was monitored during the vegetation period from March to September using chromatography analysis. Phloridzin, the major glycoside of interest, reached the highest values in the bark of all the tested cultivars in May (up to 91.7 ± 4.4 mg g−1 of the dried weight (DW), cv. ‘Opal’). In the leaves, the highest levels of phloridzin were found in cv. ‘Opal’ in May (82.5 ± 22.0 mg g−1 of DW); in twigs, the highest levels were found in cv. ‘Rozela’ in September (52.4 ± 12.1 mg g−1 of DW). In the flower buds, the content of phloridzin was similar to that in the twigs. Aglycone phloretin was found only in the leaves in relatively low concentrations (max. value 2.8 ± 1.4 mg g−1 of DW). The highest values of rutin were found in the leaves of all the tested cultivars (10.5 ± 2.9 mg g−1 of DW, cv. ‘Opal’ in September); the concentrations in the bark and twigs were much lower. The highest content of chlorogenic acid was found in flower buds (3.3 ± 1.0 mg g−1 of DW, cv. ‘Rozela’). Whole apple fruits harvested in September were rich in chlorogenic acid and phloridzin. The statistical evaluation by Scheffe’s test confirmed the significant difference of cv. ‘Rozela’ from the other tested cultivars. In conclusion, apple tree bark, twigs, and leaves were found to be important renewable resources of bioactive phenolics, especially phloridzin and rutin. The simple availability of waste plant material can therefore be used as a rich source of phenolic compounds for cosmetics, nutraceuticals, and food supplement preparation. Full article
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11 pages, 2351 KiB  
Communication
In Vitro Evaluation of Pro- and Antioxidant Effects of Flavonoid Tricetin in Comparison to Myricetin
by Vladimir Chobot, Franz Hadacek, Gert Bachmann, Wolfram Weckwerth and Lenka Kubicova
Molecules 2020, 25(24), 5850; https://doi.org/10.3390/molecules25245850 - 11 Dec 2020
Cited by 15 | Viewed by 2445
Abstract
Flavonoids are rather common plant phenolic constituents that are known for potent antioxidant effects and can be beneficial for human health. Flavonoids with a pyrogallol moiety are highly efficient reducing agents with possible pro- and antioxidant effects, depending on the reaction milieu. Therefore, [...] Read more.
Flavonoids are rather common plant phenolic constituents that are known for potent antioxidant effects and can be beneficial for human health. Flavonoids with a pyrogallol moiety are highly efficient reducing agents with possible pro- and antioxidant effects, depending on the reaction milieu. Therefore, the redox properties of myricetin and tricetin were investigated by differential pulse voltammetry and deoxyribose degradation assay. Tricetin proved to be a good antioxidant but only showed negligible pro-oxidant activity in one of the deoxyribose degradation assay variants. Compared to tricetin, myricetin showed pro- and antioxidant effects. The more efficient reducing properties of myricetin are probably caused by the positive mesomeric effect of the enolic 3-hydroxy group on ring C. It is evident that the antioxidant properties of structurally similar flavonoids can be converted to apparent pro-oxidant effects by relatively small structural changes, such as hydroxylation. Since reactive oxygen species (ROS) often serve as secondary messengers in pathological and physiological processes in animal and plant cells, the pro- and antioxidant properties of flavonoids are an important part of controlling mechanisms of tissue signal cascades. Full article
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Review

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20 pages, 4185 KiB  
Review
Chemistry and Biological Activity of Alkaloids from the Genus Lycoris (Amaryllidaceae)
by Lucie Cahlíková, Kateřina Breiterová and Lubomír Opletal
Molecules 2020, 25(20), 4797; https://doi.org/10.3390/molecules25204797 - 19 Oct 2020
Cited by 30 | Viewed by 4619
Abstract
Lycoris Herbert, family Amaryllidaceae, is a small genus of about 20 species that are native to the warm temperate woodlands of eastern Asia, as in China, Korea, Japan, Taiwan, and the Himalayas. For many years, species of Lycoris have been subjected to extensive [...] Read more.
Lycoris Herbert, family Amaryllidaceae, is a small genus of about 20 species that are native to the warm temperate woodlands of eastern Asia, as in China, Korea, Japan, Taiwan, and the Himalayas. For many years, species of Lycoris have been subjected to extensive phytochemical and pharmacological investigations, resulting in either the isolation or identification of more than 110 Amaryllidaceae alkaloids belonging to different structural types. Amaryllidaceae alkaloids are frequently studied for their interesting biological properties, including antiviral, antibacterial, antitumor, antifungal, antimalarial, analgesic, cytotoxic, and cholinesterase inhibition activities. The present review aims to summarize comprehensively the research that has been reported on the phytochemistry and pharmacology of the genus Lycoris. Full article
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