All Stories

  1. Subcritical Water Extraction Enables the Production of Cichoric and Caftaric Acid-Standardized Echinacea purpurea Root Extracts with Defined Composition and Favorable Biological Properties

    Article • Molecules, July 2026, MDPI AG

    Petko Denev, Assoc. prof. Milena Georgieva

  2. Chemical and Biological Characterization of Subcritical Water Extracts from <em>Echinacea purpurea</em> Roots Standardized to Hydroxycinnamic Acids

    Article • June 2026, MDPI AG

    Petko Denev, Assoc. prof. Milena Georgieva

  3. Subcritical Water Extraction as a Green Technology for the Development of Standardized Plant Extracts for Food and Pharmaceutical Uses

    Article • Processes, May 2026, MDPI AG

    Petko Denev

  4. From Plant Propagation to Anticancer Activity: Phytochemical and Biological Evaluation of Water Extracts of Salvia aethiopis L. Flowers, Leaves and Stems

    Article • Molecules, May 2026, MDPI AG

    Petko Denev

  5. Germination Triggers Substantial Changes in GABA, Polyphenol, Sugar, and Organic Acid Content of Commonly Consumed Legumes

    Article • Plants, January 2026, MDPI AG

    Petko Denev

  6. Development of Functional Fruit, Vegetable, and Herbal Beverages Enriched with Gamma-Aminobutyric Acid and Polyphenols: Is It Feasible?

    Article • Beverages, December 2025, MDPI AG

    Petko Denev

  7. Antioxidant and Anticancer Activities of Water Extracts from Flowers, Leaves and Stems of In Vitro Cultivated and Wild-Growing Marrubium vulgare Plants

    Article • Pharmaceuticals, November 2025, MDPI AG

    Petko Denev

  8. Comparative Study on Extracts from Traditional Medicinal Plants Echinacea purpurea (L.) Moench and Onopordum acanthium (L.): Antioxidant Activity In Vitro and Anxiolytic Effect In Vivo

    Article • Pharmaceuticals, November 2025, MDPI AG

    Petko Denev

  9. Screening of 31 Lactic Acid Bacteria Strains Identified Levilactobacillus brevis NCTC 13768 as a High-Yield GABA Producer

    Article • Applied Sciences, October 2025, MDPI AG

    Petko Denev

  10. Effects of Aronia melanocarpa-Based Fruit Juices on Metabolic Dysfunction-Associated Fatty Liver Disease in Rats

    Article • Gastroenterology Insights, July 2025, MDPI AG

    Petko Denev

  11. Putting Ethnobotany into Practice: In Vitro Antioxidant Potential and Impact on Rat Gastric Smooth Muscle Reactivity of Aqueous Extracts of Marrubium friwaldskyanum Boiss. and Marrubium peregrinum L.

    Article • Life, June 2025, MDPI AG

    Petko Denev

  12. Effect of Gamma Irradiation on Free Radicals and the Antioxidant Properties of Walnuts

    Article • Chemistry, April 2025, MDPI AG

    Petko Denev

  13. Phytochemical Profile, Antioxidant Capacity and Anticancer Potential of Water Extracts from In Vitro Cultivated Salvia aethiopis

    Article • Molecules, March 2025, MDPI AG

    Petko Denev

  14. Black Chokeberry (Aronia melanocarpa) Juice Supplementation Affects Age-Related Myocardial Remodeling in Rats

    Article • Life, December 2024, MDPI AG

    Petko Denev

  15. Echinacea purpurea and Onopordum acanthium Combined Extracts Cause Immunomodulatory Effects in Lipopolysaccharide-Challenged Rats

    Article • Plants, December 2024, MDPI AG

    Petko Denev

  16. Growth Kinetics Modeling and Evaluation of Antiphytopathogenic Activity of Newly Isolated Fungicolous Epicoccum nigrum Associated with Dryad’s Saddle (Polyporaceae)

    Article • Agriculture, November 2024, MDPI AG

    Petko Denev

  17. Exopolysaccharides from the Green Microalga Strain Coelastrella sp. BGV—Isolation, Characterization, and Assessment of Anticancer Potential

    Article • Current Issues in Molecular Biology, September 2024, MDPI AG

    Petko Denev

  18. Echinacea Species Cultivated in Bulgaria as a Source of Chicoric and Caftaric Acids

    Article • Agronomy, September 2024, MDPI AG

    Petko Denev

  19. Neuroprotective Effect of Marrubium vulgare Extract in Scopolamine-Induced Cognitive Impairment in Rats: Behavioral and Biochemical Approaches

    Article • Biology, June 2024, MDPI AG

    Petko Denev

  20. Black Chokeberry (Aronia melanocarpa) Juice Supplementation Improves Oxidative Stress and Aging Markers in Testis of Aged Rats

    Article • Current Issues in Molecular Biology, May 2024, MDPI AG

    Petko Denev

  21. In Vivo Anti-Inflammatory and Antinociceptive Activities of Black Elder (Sambucus nigra L.) Fruit and Flower Extracts

    Article • Pharmaceuticals, March 2024, MDPI AG

    Petko Denev

  22. Extracts of Sideritis scardica and Clinopodium vulgare Alleviate Cognitive Impairments in Scopolamine-Induced Rat Dementia

    Article • International Journal of Molecular Sciences, February 2024, MDPI AG

    Petko Denev

  23. Comparative Study on Phytochemical Composition, Antioxidant, and Anti-HSV-2 Activities of Sambucus nigra L. and Sambucus ebulus L. Extracts

    Article • Applied Sciences, November 2023, MDPI AG

    Petko Denev

  24. Antioxidant and Antitumor Potential of Micropropagated Balkan Endemic Sideritis scardica Griseb

    Article • Plants, November 2023, MDPI AG

    Petko Denev

  25. Phenolic Profile and Antioxidant Potential of Beverages from Buckwheat and Side Streams after Beverages Production

    Article • Processes, November 2023, MDPI AG

    Dr Magdalena Karamać, Petko Denev

  26. Chemical Composition of Different Extracts from Echinacea purpurea (L.) Moench Roots and Evaluation of Their Antimicrobial Activity

    Article • ChemEngineering, October 2023, MDPI AG

    Assoc. Prof. Ivayla Nedyalkova Dincheva, Petko Denev, Chief Assistant Prof. Nadezhda Traycheva Petkova

  27. Aromatized Wine-Type Beverages with Added Byproducts of Essential Rose Oil Industry

    Article • Applied Sciences, September 2023, MDPI AG

    Assoc. Prof. Ivayla Nedyalkova Dincheva, Petko Denev

  28. A Study of the Chemical Composition, Antioxidant Potential, and Acute Toxicity of Bulgarian Tanacetum vulgare L. Essential Oil

    Article • Molecules, August 2023, MDPI AG

    Petko Denev

  29. Biologically Active Compounds from Probiotic Microorganisms and Plant Extracts Used as Biopreservatives

    Article • Microorganisms, July 2023, MDPI AG

    Petko Denev

  30. Phytochemical Characterization of Purple Coneflower Roots (Echinacea purpurea (L.) Moench.) and Their Extracts

    Article • Molecules, May 2023, MDPI AG

    Petko Denev, Chief Assistant Prof. Nadezhda Traycheva Petkova

  31. Effects of Sideritis scardica Extract on Scopolamine-Induced Learning and Memory Impairment in Mice

    Article • Journal of Alzheimer’s Disease, April 2023, IOS Press

    Petko Denev

  32. Antitumor and Antioxidant Activities of In Vitro Cultivated and Wild-Growing Clinopodium vulgare L. Plants

    Article • Plants, April 2023, MDPI AG

    Petko Denev

  33. Subcritical Water Extraction of Rosmarinic Acid from Lemon Balm (Melissa officinalis L.) and Its Effect on Plant Cell Wall Constituents

    Article • Antioxidants, April 2023, MDPI AG

    Petko Denev

  34. Effect of Gamma Irradiation on Fat Content, Fatty Acids, Antioxidants and Oxidative Stability of Almonds, and Electron Paramagnetic Resonance (EPR) Study of Treated Nuts

    Article • Molecules, February 2023, MDPI AG

    Petko Denev

  35. Phytochemical Composition and Therapeutic Potential of Bistorta major Gray: A Review

    Article • January 2023, Springer Science + Business Media

    Petko Denev

  36. Modulation Effect on Tubulin Polymerization, Cytotoxicity and Antioxidant Activity of 1H-Benzimidazole-2-Yl Hydrazones

    Article • Molecules, December 2022, MDPI AG

    Petko Denev

  37. Validation of HPLC Method for Analysis of Gamma-Aminobutyric and Glutamic Acids in Plant Foods and Medicinal Plants

    Article • Molecules, December 2022, MDPI AG

    Petko Denev

  38. A jojoba (Simmondsia chinensis) seed cake extracts express hepatoprotective activity against paracetamol-induced toxicity in rats

    Article • Biomedicine & Pharmacotherapy, September 2022, Elsevier

    Petko Denev

  39. Structural Features and Immunomodulatory Effects of Water-Extractable Polysaccharides from Macrolepiota procera (Scop.) Singer

    Article • Journal of Fungi, August 2022, MDPI AG

    Ondrej Vasicek, Tsvetelina Batsalova, Petko Denev

  40. Structural characterization of polysaccharides from Geranium sanguineum L. and their immunomodulatory effects in response to inflammatory agents

    Article • Journal of Ethnopharmacology, August 2022, Elsevier

    Petko Denev

  41. Modelling of Malt Mixture for the Production of Wort with Increased Biological Value

    Article • Beverages, July 2022, MDPI AG

    Petko Denev

  42. Nutrient Constituents, Bioactive Phytochemicals, and Antioxidant Properties of Service Tree (Sorbus domestica L.) Fruits

    Article • Plants, July 2022, MDPI AG

    Petko Denev, Chief Assistant Prof. Nadezhda Traycheva Petkova

  43. Aronia melanocarpa Fruit Juice Modulates ACE2 Immunoexpression and Diminishes Age-Related Remodeling of Coronary Arteries in Rats

    Article • Foods, April 2022, MDPI AG

    Petko Denev

  44. Influence of Gamma Irradiation on Different Phytochemical Constituents of Dried Rose Hip (Rosa canina L.) Fruits

    Article • Molecules, March 2022, MDPI AG

    Petko Denev

  45. Addition of Medicinal Plants Increases Antioxidant Activity, Color, and Anthocyanin Stability of Black Chokeberry (Aronia melanocarpa) Functional Beverages

    Article • Plants, January 2022, MDPI AG

    Petko Denev

  46. Immunomodulating polysaccharide complexes and antioxidant metabolites from Anabaena laxa, Oscillatoria limosa and Phormidesmis molle

    Article • Algal Research, December 2021, Elsevier

    Tsvetelina Batsalova, Petko Denev

  47. Utilization of Industrial Rosa damascena Mill. By-products and Cocoa Pod Husks as Natural Preservatives in Muffins

    Article • Periodica Polytechnica Chemical Engineering, November 2021, Periodica Polytechnica Budapest University of Technology and Economics

    Petko Denev

  48. Waste Rose Flower and Lavender Straw Biomass—An Innovative Lignocellulose Feedstock for Mycelium Bio-Materials Development Using Newly Isolated Ganoderma resinaceum GA1M

    Article • Journal of Fungi, October 2021, MDPI AG

    Petko Denev, Chief Assistant Prof. Nadezhda Traycheva Petkova

  49. MANAGING QUALITY OF AROMATIZED WINE PREPARED BY COFERMENTATION OF GRAPE MUST AND BY-PRODUCTS OF ESSENTIAL ROSE OIL INDUSTRY

    Article • Carpathian Journal of Food Science and Technology, September 2021, Technical University of Cluj Napoca

    Petko Denev

  50. Optimization of microwave assisted extraction of simmondsins and polyphenols from Jojoba (Simmondsia chinensis) seed cake using Box-Behnken statistical design

    Article • Food Chemistry, September 2021, Elsevier

    Petko Denev

  51. Study of the influence of rootstocks on fruit flesh quality of three plum cultivars

    Article • Acta Horticulturae, September 2021, International Society for Horticultural Science (ISHS)

    Petko Denev

  52. Black Chokeberry (Aronia melanocarpa) Functional Beverages Increase HDL-Cholesterol Levels in Aging Rats

    Article • Foods, July 2021, MDPI AG

    Petko Denev

  53. Comparative Study on Phenolic Content and Antioxidant Activity of Different Malt Types

    Article • Antioxidants, July 2021, MDPI AG

    Petko Denev

  54. Incorporation of quinoa seeds accessions in instant noodles improves their textural and quality characteristics

    Article • Journal of Food Science and Technology, July 2021, Springer Science + Business Media

    Petko Denev

  55. Phytochemical Composition, Antioxidant and Antimicrobial Activity of the Balkan Endemic Micromeria frivaldszkyana (Degen) Velen. (Lamiaceae)

    Article • Plants, April 2021, MDPI AG

    Petko Denev

  56. Green approach to obtain extracts of seven edible flowers

    Article • IOP Conference Series Materials Science and Engineering, January 2021, Institute of Physics Publishing

    Petko Denev

  57. Metabolite Profile and Antioxidant Activity of Some Species of Genus Scutellaria Growing in Bulgaria

    Article • Plants, December 2020, MDPI AG

    Petko Denev

  58. Aronia melanocarpa (Michx.) Elliot fruit juice reveals neuroprotective effect and improves cognitive and locomotor functions of aged rats

    Article • Food and Chemical Toxicology, October 2019, Elsevier

    Petko Denev

  59. Protective effects of Aronia melanocarpa juices either alone or combined with extracts from Rosa canina or Alchemilla vulgaris in a rat model of indomethacin-induced gastric ulcers

    Article • Food and Chemical Toxicology, October 2019, Elsevier

    Petko Denev

  60. The ancient Thracian endemic plant Haberlea rhodopensis Friv. and related species: A review

    Article • Journal of Ethnopharmacology, October 2019, Elsevier

    Petko Denev

  61. Phytochemical composition and antioxidant activity of 63 Balkan pepper (Capsicum annuum L.) accessions

    Article • Journal of Food Measurement & Characterization, June 2019, Springer Science + Business Media

    Petko Denev

  62. Black chokeberry (Aronia melanocarpa) polyphenols reveal different antioxidant, antimicrobial and neutrophil-modulating activities

    Article • Food Chemistry, June 2019, Elsevier

    Petko Denev

  63. Rosa damascena waste mediated synthesis of silver nanoparticles: Characteristics and application for an electrochemical sensing of hydrogen peroxide and vanillin

    Article • Materials Chemistry and Physics, June 2019, Elsevier

    Petko Denev

  64. Co-pigmentation of black chokeberry (Aronia melanocarpa) anthocyanins with phenolic co-pigments and herbal extracts

    Article • Food Chemistry, May 2019, Elsevier

    Petko Denev

  65. Black Chokeberry (Aronia melanocarpa (Michx.) Elliot) Fruits and Functional Drinks Differ Significantly in Their Chemical Composition and Antioxidant Activity

    Article • Journal of Chemistry, November 2018, Hindawi Publishing Corporation

    Petko Denev

  66. Effect of lavender (Lavandula angustifolia) and melissa (Melissa Officinalis) waste on quality and shelf life of bread

    Article • Food Chemistry, July 2018, Elsevier

    Petko Denev

  67. Acidic polysaccharide complexes from purslane, silver linden and lavender stimulate Peyer’s patch immune cells through innate and adaptive mechanisms

    Article • International Journal of Biological Macromolecules, December 2017, Elsevier

    Tsvetelina Batsalova, Ondrej Vasicek, Petko Denev

  68. Erratum to “The common lavender (Lavandula angustifolia Mill.) pectic polysaccharides modulate phagocytic leukocytes and intestinal Peyer’s patch cells” [Carbohydr. Polym. 174 (2017) 948–959]

    Article • Carbohydrate Polymers, December 2017, Elsevier

    Ondrej Vasicek, Petko Denev

  69. Tilia tomentosa pectins exhibit dual mode of action on phagocytes as β-glucuronic acid monomers are abundant in their rhamnogalacturonans I

    Article • Carbohydrate Polymers, November 2017, Elsevier

    Tsvetelina Batsalova, Ondrej Vasicek, Petko Denev

  70. The common lavender ( Lavandula angustifolia Mill.) pectic polysaccharides modulate phagocytic leukocytes and intestinal Peyer’s patch cells

    Article • Carbohydrate Polymers, October 2017, Elsevier

    Ondrej Vasicek, Petko Denev

  71. Combined recovery of polysaccharides and polyphenols from Rosa damascena wastes

    Article • Industrial Crops and Products, June 2017, Elsevier

    Petko Denev

  72. Antioxidant potential of curcumin-related compounds studied by chemiluminescence kinetics, chain-breaking efficiencies, scavenging activity (ORAC) and DFT calculations

    Article • Beilstein Journal of Organic Chemistry, August 2015, Beilstein Institut

    PhD Silvia Emilova Angelova, Petko Denev

  73. Antiatherogenic and Cardioprotective Effects of Black Chokeberry (Aronia melanocarpa) Juice in Aging Rats

    Article • Evidence-based Complementary and Alternative Medicine, January 2015, Hindawi Publishing Corporation

    Petko Denev

  74. Flavonoid glycosides profiling in dwarf elder fruits (Sambucus ebulus L.) and evaluation of their antioxidant and anti-herpes simplex activities

    Article • Industrial Crops and Products, January 2015, Elsevier

    Petko Denev

  75. Biological activities of selected polyphenol-rich fruits related to immunity and gastrointestinal health

    Article • Food Chemistry, August 2014, Elsevier

    Ondrej Vasicek, Petko Denev

  76. The effects of biologically active substances in medicinal plants on the metabolic activity of neutrophils

    Article • Phytochemistry Reviews, February 2014, Springer Science + Business Media

    Ondrej Vasicek, Petko Denev

  77. Effects of Pectic Polysaccharides Isolated from Leek on the Production of Reactive Oxygen and Nitrogen Species by Phagocytes

    Article • Journal of Medicinal Food, August 2013, Mary Ann Liebert Inc

    Petko Denev

  78. Bioavailability and Antioxidant Activity of Black Chokeberry (Aronia melanocarpa) Polyphenols: in vitro and in vivo Evidences and Possible Mechanisms of Action: A Review

    Article • Comprehensive Reviews in Food Science and Food Safety, August 2012, Wiley

    Petko Denev

  79. Electrochemical Sensing of Total Antioxidant Capacity and Polyphenol Content in Wine Samples Using Amperometry Online-Coupled with Microdialysis

    Article • Journal of Agricultural and Food Chemistry, August 2012, American Chemical Society (ACS)

    Petko Denev

  80. Inhibition of lung tumor development by berry extracts in mice exposed to cigarette smoke

    Article • International Journal of Cancer, March 2012, Wiley

    Petko Denev

  81. Flavonoids Inhibit the Respiratory Burst of Neutrophils in Mammals

    Article • Oxidative Medicine and Cellular Longevity, January 2012, Hindawi Publishing Corporation

    Ondrej Vasicek, Petko Denev

  82. Antioxidant and cholinesterases inhibitory activities of Verbascum xanthophoeniceum Griseb. and its phenylethanoid glycosides

    Article • Food Chemistry, September 2011, Elsevier

    Petko Denev

  83. Solid-phase extraction of berries’ anthocyanins and evaluation of their antioxidative properties

    Article • Food Chemistry, December 2010, Elsevier

    Petko Denev

  84. Antioxidant activity of devil’s claw cell biomass and its active constituents

    Article • Food Chemistry, August 2010, Elsevier

    Petko Denev

  85. Different methods for control and comparison of the antioxidant properties of vegetables

    Article • Food Control, April 2010, Elsevier

    Petko Denev

  86. Antioxidant Activity and Phenolic Content of Betalain Extracts from Intact Plants and Hairy Root Cultures of the Red Beetroot Beta vulgaris cv. Detroit Dark Red

    Article • Plant Foods for Human Nutrition, February 2010, Springer Science + Business Media

    Dr Vasil G Georgiev, Petko Denev

  87. Antioxidant Activity and Bioactive Constituents of the Aerial Parts ofHarpagophytum ProcumbensPlants

    Article • Biotechnology & Biotechnological Equipment, January 2010, Taylor & Francis

    Petko Denev

  88. Probiotic StrainLactobacillus PlantarumNBIMCC 2415 with Antioxidant Activity as a Starter Culture in the Production of Dried Fermented Meat Products

    Article • Biotechnology & Biotechnological Equipment, January 2010, Taylor & Francis

    Petko Denev

  89. Comparative investigations of the influence of H1-antihistamines on the generation of reactive oxygen species by phagocytes

    Article • Inflammation Research, March 2008, Springer Science + Business Media

    Petko Denev, Dr Lukas Kubala