Antigoni Cheilari

National and Kapodistrian University of Athens | uoa · Department of Pharmacognosy and Chemistry of Natural Products

Quantitative NMR spectroscopy (qNMR) is known as excellent alternative to chromatography based mixture analysis. NMR spectroscopy is a non-destructive method, needs only limited sample preparation and can be readily automated. A head-to-head comparison of qNMR to an uHPLC-DAD based quantitative analysis of six flavonolignan congeners (silychristin,...

The present study aimed to investigate the metabolic profile, as well as the antioxidant and anti-ageing activities of twenty propolis samples from different regions of Greece. Chemical profiling of methanolic extracts was investigated using HPTLC and ¹H-NMR techniques. Their antioxidant activity was evaluated by free radical scavenging methods (DP...

The processing of medicinal and aromatic plants (MAPs) results in the production of a significant amount of plant by-products; herbal material of inferior quality and/or unusable plant parts that are not commercially exploitable. An extensive study of Greek native species was performed toward the production of innovative bioactive products using as...

A review research was conducted to provide an overview of the ethnobotanical knowledge of medicinal plants and traditional medical practices for the treatment of skin disorders in Albania, Cyprus, Greece, and Turkey. The geographical and ecological characteristics of the Balkan Peninsula and Mediterranean Sea, along with the historical connection a...

As part of our ongoing research on phytoestrogens, we investigated the phytochemical profile and estrogen-like activities of eight extracts from the aerial parts of four Genista species of Greek flora using estrogen-responsive cell lines. Ethyl acetate and methanolic extracts of G. acanthoclada, G. depressa,G. hassertiana, and G. millii were obtain...

Conventional isolation methods in natural products chemistry are time-consuming and costly and often result in the isolation of moderately active compounds or the detection of already known natural products (NPs). A fast and cost-effective way to identify bioactive metabolites in plant extracts prior to isolation has been developed based on the nuc...

Preterm birth, affecting about 10% of pregnancies, significantly contributes to perinatal morbidity and mortality. Recent research indicates that metabolomics could enhance pregnancy outcomes and reduce costs by identifying biomarkers related to common pregnancy complications. Our team focused on analyzing amniotic fluid collected during the second...

Organometallic ruthenium complexes with p-cymene = 1-methyl-4-(1-methylethyl)-benzene and N^N = bidentate polypyridyl ligands constitute interesting candidates with biological and catalytic properties. Towards this aim, we have synthesized four ruthenium(II)–arene complexes of the type [Ru(η6-p-cymene)(N^N)Cl][X] (N^N = Br-Qpy = 6-bromo-4-phenyl-2-...

Organometallic complexes of the formula [Ru(N^N)(p-cymene)Cl][X] (N^N = bidentate polypyridyl ligands, p-cymene = 1-methyl-4-(1-methylethyl)-benzene, X = counter anion), are currently studied as possible candidates for the potential treatment of cancer. Searching for new organometallic compounds with good to moderate cytotoxic activities, a series...

Thiazolin-4-ones and their derivatives represent important heterocyclic scaffolds with various applications in medicinal chemistry. For that reason, the synthesis of two 5-substituted thiazolidin-4-one derivatives was performed. Their structure assignment was conducted by NMR experiments (2D-COSY, 2D-NOESY, 2D-HSQC and 2D-HMBC) and conformational a...

Purpose Crayfish treatment leads to the production of waste and byproducts up to 80% of the total initial seafood amount. The current common method to handle such waste is the landfilling practice which produces remarkable amounts of hazardous gasses and substances due to the anaerobic decomposition process. In this study, an integrated procedure i...

Introduction Processing of Medicinal Aromatic Plants (MAPs) results in the production of a significant amount of by-products, which are not commercially exploitable. Towards this direction, we studied extensively the by-products of oregano and thyme, remaining after the aromatization of olive oils with microwave assisted extraction (MAE). The purpo...

The volatiles of different aerial parts of three kumquat species (Fortunella margarita Swingle–Nagami, Fortunella japonica Swingle–Marumi, and Fortunella crassifolia Swingle–Meiwa) growing in Greece were analyzed via GC-MS and evaluated for their antimicrobial properties against nine human pathogenic microorganisms. A total number of 23 compounds w...

In the last decades, the use of medicinal and aromatic plants (MAPs) shows an increase in both animal and human nutrition and demonstrates a plethora of beneficial properties attributed to the bioactive compounds that have been investigated in their extracts and essential oils, which are considered as a great source of antioxidant and antimicrobial...

Food waste and byproducts landfilling practice produce remarkable amounts of hazardous gasses and substances due to the anaerobic decomposition process. Vertical integration of production and waste valorization are two of the methods adopted globally to reduce food waste following the circular economy and environmentally friendly practices spirit....

Preterm delivery (PTD) is a notable pregnancy complication, affecting one out of every ten births. This study set out to investigate whether analyzing the metabolic composition of amniotic fluid (AF) collected from pregnant women during the second trimester of pregnancy could offer valuable insights into prematurity. The research employed 1H–NMR me...

Throughout centuries, traditional herbal medicine and the employment of medicinal plants have constituted an important tool for the treatment and prevention of numerous diseases. The present study focuses on the collection of ethnopharmacological data regarding the uses of medicinal plants for the treatment of dermatological ailments in various vil...

The potential of the 4,6-diphenyl-3,4-dihydropyrimidine-2(1H)-thione (abbreviated as KKII5) and (E)-N'-benzylidenehydrazinecarbothiohydrazide (abbreviated as DKI5) compounds as possible drug leads is investigated. KKII5 and DKI5 are synthesized in high yield of up to 97%. Their structure, binding in the active site of the LOX-1 enzyme, and their to...

In this study, the black fertile (BSs) and the red unfertile seeds (RSs) of the Greek endemic Paeonia clusii subsp. rhodia (Stearn) Tzanoud were studied for the first time. Nine phenolic derivatives, trans-resveratol, trans-resveratrol-4′-O-β-d-glucopyranoside, trans-ε-viniferin, trans-gnetin H, luteolin, luteolin 3′-O-β-d-glucoside, luteolin 3′,4′...

The aim of the present study was the phytochemical analysis of the aerial parts of Heliotropium procumbens Mill., a herb from Boraginaceae plant family not previously studied. The methanol (ME) and aqueous extracts (WE) of the aerial parts were assayed for their total phenolic and flavonoid content and antioxidant properties, using free radical sca...

Inhalation of plant extracts has proven to treat chronic or acute diseases of the respiratory tract, due to the presence of bioactive compounds with antioxidant, antimicrobial and anti-inflammatory activity (Santana et al., 2016). However, the protective role of inhalation of extracts derived from plants of the Greek flora in pulmonary inflammation...

Heliotropium (Boraginaceae) is a plant genus widespread, used in folk medicine for its healing properties (against inflammation, rheumatism, skin disorders etc), known source of pyrrolizidine alkaloids (PAs) and their N-oxides (PANOs), and phenolic metabolites [1]. In the framework of our phytochemical studies on Boraginaceae plants [2], we report...

Propolis is a bee-produced substance rich in bioactive compounds, which has been utilized widely in folk medicine, in food supplement and cosmetology areas because of its biological properties, (antibacterial, antiviral, antioxidant, anti-inflammatory, etc.). The subject of this study is associated with the chemical analysis and the biological eval...

The structure assignment and conformational analysis of the thiosemicarbazones, DKI21 and DKI24, were performed through homonuclear and heteronuclear 2D Nuclear Magnetic Resonance (NMR) spectroscopy (2D-COSY, 2D-NOESY, 2D-ROESY, 2D-HSQC, and 2D-HMBC) and quantum mechanics (QM) calculations, using Functional Density Theory (DFT). In addition, utiliz...

Cynara cardunculus L. is a plant of the Mediterranean basin, known since antiquity as a food and for its therapeutic properties. The needs of the 21st century for the utilization of agricultural waste has led to the study of the seed oil of a Greek cultivar of Cynara cardunculus (GCCC) as potential nutritional oil, as large amounts of cardoon seeds...

Background Prolonged maintenance of proteome stability and functionality (proteostasis) is of emerging significance in aging retardation and healthspan. Purpose An enriched polyphenolic extract obtained from the hydrodistillation of rose petals was tested for its capacity to activate the proteostasis network modules, and thus modulate health- and/...

Introduction Bioactive constituents of medicinal-aromatic plants used as feed additives may affect the metabolic profile and oxidative stability of hen eggs. Objectives To determine the effects of dietary supplementation with a mixture of dried oregano, thyme, sideritis tea and chamomile on laying hen performance, egg quality parameters, and oxida...

Chemical composition of propolis depends on the plant source and thus on the geographic and climatic characteristics of the site of collection. The aim of this study was to investigate the chemical profile of Greek and Chinese propolis extracts from different regions and suggest similarities and differences between them. Untargeted ultrahigh-perfor...

The purpose of this study was to evaluate the response of estrogen target cells to a series of isoflavone glucosides and aglycones from Genista halacsyi Heldr. The methanolic extract of aerial parts of this plant was processed using fast centrifugal partition chromatography, resulting in isolation of four archetypal isoflavones (genistein, daidzein...

The effect of cultivation methods on plant development, yield, secoiridoid glycoside content, and physical and microbiological contamination of centaury (Centaurium erythraea) were investigated. Plants were cultivated in uncovered soil, soil covered with mulch film, or in pots. There was no difference in dry matter yield of plants grown on a mulch...

Silybum marianum (L.) Gaertn. (Asteraceae) is one of the most investigated plant extracts with known mechanism of action. Milk thistle preparations have been used to treat a variety of ailments, particularly against liver damage. The beneficial properties of S. marianum are ascribed to silymarin, a mixture of (at least) six flavonolignans and one f...

Plants of genus Genista (Fabaceae) have been characterized by significant presence of isoflavones which have demonstrated important phytoestrogenic activity and therefore there are of great interest for our research group1. Genista hassertiana is a Greek endemic plant without phytochemical references and its methanolic extract has showed a rich phy...

Fabaceae family contains plants that are characterized by significant biological activities. The main edible plants of this family constitute an important part of the Mediterranean diet and contain secondary metabolites with considerable estrogenic, antioxidant and chemopreventing activity1. Recent years CCC has become a method of choice in separat...