A5002985415- Phytochemicals and Antioxidant Activities
- Edible Oils Quality and Analysis
- Free Radicals and Antioxidants
- Antioxidant Activity and Oxidative Stress
- Essential Oils and Antimicrobial Activity
- Spectroscopy and Chemometric Analyses
- Dye analysis and toxicity
- Saffron Plant Research Studies
- Phytochemistry and Biological Activities
- Fermentation and Sensory Analysis
- Identification and Quantification in Food
- Tea Polyphenols and Effects
- Synthesis of Organic Compounds
- Advanced Chemical Sensor Technologies
- Isotope Analysis in Ecology
- Metabolomics and Mass Spectrometry Studies
- Computational Drug Discovery Methods
- Analytical Chemistry and Chromatography
- Natural product bioactivities and synthesis
- Meat and Animal Product Quality
- Food Quality and Safety Studies
- Biochemical and biochemical processes
- Chemistry and Chemical Engineering
- Ginkgo biloba and Cashew Applications
- Nutrition, Genetics, and Disease
Aristotle University of Thessaloniki
2016-2025
Shandong University of Technology
2003-2004
University of Ioannina
2002
Observations on the applicability of ABTS•+ assay to define structure−activity relationships (SARs) among phenols (AH) were based experimental data and theoretical calculations. All AH examined (hydroxycinnamic derivatives, simple polyphenols, polyhydroxybenzoates, flavonoids) found be active toward ABTS•+. Moreover, known weak radical scavengers (i.e., coumaric isoferulic acids) efficient or comparatively caffeic rosmarinic acids in contradiction classification 1,1-diphenyl-2-picrylhydrazyl...
Oregano vulgare L. ssp. hirtum (Greek oregano), Salvia fruticosa sage), and Satureja hortensis (summer savory) were examined as potential sources of phenolic antioxidant compounds. The capacities (antiradical activity by DPPH* test, phosphatidylcholine liposome oxidation, Rancimat test) total phenol content determined in the ethanol acetone extracts dried material obtained from botanically characterized plants. ground was also tested test for its effect on stability sunflower oil. data...
The choice of reference compounds is examined as a "critical control point" antioxidant activity assessment. Gallic, caffeic, sinapic, uric, and ascorbic acids, isoeugenol, Trolox were tested using different redox (FRAP, Folin−Ciocalteu) radical scavenging (DPPH•, ABTS•+, CBA, ORAC) assays. ability to chelate transition metals was assessed support some the findings. Analytes also in liposomes. On basis findings, we do not recommend uric acid (due solubility constrains) fast degradation...
Differences in the antioxidant activity of some biosynthetically related ferulic acid derivatives induced by presence characteristic groups (−COOH, −CHO, −CH2OH, −CH3, and −COOC2H5) at end their carbon side chain were investigated using both experimental computational methods. The relative order scavenging toward DPPH radical derived from kinetic studies was isoeugenol ∼ coniferyl alcohol ≫ aldehyde ethyl ferulate. In bulk oil autoxidation (45 °C) same obtained. o/w emulsion autoxidation,...
Abstract Rapid 1,1‐diphenyl‐2‐picrylhydrazyl (DPPH • ) tests are often applied to classify the scavenging activity of phenolic compounds (AH). Published analytical protocols differ in more than one experimental condition, and results for relative order or magnitude contradictory. In this work, parameters such as duration test, [AH]/[DPPH ] molar ratio, solvent effects were examined discussed. The test value ratio did not influence among tested antioxidants. Ethanol, commonly used tests, was...
The radical scavenging activity of maritimetin and a series synthetic aurones has been studied by using density functional theory with the B3LYP exchange correlation functional. computation various molecular descriptors that could assist elucidation hydrogen atom electron donating ability selected compounds was carried out in gas phase liquid (benzene, methanol, water) aid IEF-PCM. For reasons comparison simple phenols known were also included study. results are discussed regards to...
A health claim on "olive oil polyphenols", namely, hydroxytyrosol and its derivatives, was recently approved by EC Regulation 432/2012. As no official method exists so far for the complete separation of all forms tyrosol present in oil, it is utmost importance to find a simple, reproducible, undisputable protocol protect consumers avoid unfair competition. In this study two hydrolysis protocols complex either polar fraction (protocol 1) or directly 2) were comparatively applied series extra...
Virgin avocado oil (VAO), treasured for its nutritional and sensory properties, is susceptible to oxidation. To improve oxidative stability, the feasibility of enrichment with antioxidants from or olive-processing by-products via ultrasound-assisted maceration was explored. Dried, milled (AL), olive leaves (OL), pomace (OP) were ultrasound-macerated laboratory-extracted VAO at 5, 10, 20% w/w levels. Induction-period (IP) values, determined Rancimat (110 °C, 20 L/h), increased by...
Data for antiradical properties of saffron extract and its bioactive constituents (crocins, crocetin) are limited poorly discussed in comparison with those extracts containing potent scavengers. Further examination was sought using the Folin−Ciocalteu (F−C) reagent various free radical species produced cell-free or cell model systems. Oregano turmeric methanol extracts, rich well established scavengers, also crocetin, rosmarinic acid, curcumin, representing major types three studied were...
Vibrational spectroscopic techniques, infrared (near, mid, far) and Raman that are based on the continuous vibrational motion of atoms in corresponding bonds compounds correlate a unique way physical properties materials gaseous, solid, or liquid state with molecular structure. Olive industry olive oil official control may benefit from introduction these powerful techniques to address quality authenticity issues. This review focuses evidence obtained comparative studies among different for...
Abstract The importance of a catechol moiety to the radical‐scavenging activity p ‐hydroxycinnamic derivatives is widely accepted, whereas role carbon side chain remains controversial. Extension conjugation this molecular feature that requires some attention. Differences in caffeic and dihydrocaffeic acids were examined using series experimental procedures: assays free radicals [1,1‐diphenyl‐2‐picrylhydrazyl (DPPH • ) 2,2′‐azino‐bis(3‐ethylbenzthiazoline‐6‐sulfonic acid) (ABTS •+ )]; based...
The radical scavenging potential of phenolic compounds occurring in Olea europaea and recently identified hydroxytyrosol metabolites was evaluated by means quantum chemical calculations. bond dissociation enthalpy (BDE) hydroxyl groups the ionization (IP) were calculated as descriptors to predict H-atom-donating electron-donating abilities antioxidants, respectively. Catechol derivatives had lowest BDE values (77.7-80.1 kcal/mol) whereas lignans, pinoresinol 1-acetoxypinoresinol, other...