Natalina Konstantinova Panova

Ms. Natalina Konstantinova Panova

orcid

Research Focus & Metrics

Academic Career Length

2Years (2025-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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29 May 2025 in Life
Verified
Journal Article
Open access
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Natalina Konstantinova PanovaNatalina Konstantinova Panova
Natalina Konstantinova Panova
AGAnelia Tsvetanova Gerasimova
Anelia Tsvetanova Gerasimova
Galia GentschevaGalia Gentscheva
Galia Gentscheva
Stoyanka Atanasova NikolovaStoyanka Atanasova Nikolova
Stoyanka Atanasova Nikolova
LMLubomir Makedonski
Lubomir Makedonski
KNKrastena Nikolova
Krastena Nikolova
Moringa oleifera, often referred to as the “miracle tree”, has gained widespread recognition for its exceptional nutritional profile and broad pharmacological potential. This review provides a comprehensive synthesis of the plant’s botanical characteristics, taxonomy, cultivation practices, and biochemical composition. Special emphasis is placed on its rich content of bioactive secondary metabolites-such as flavonoids, alkaloids, phenolic acids, saponins, isothiocyanates, and glucosinolates-which underlie its diverse therapeutic effects. The paper compiles and analyzes evidence from over 200 peer-reviewed studies, documenting antioxidant, anti-inflammatory, antimicrobial, antidiabetic, anticancer, hepatoprotective, neuroprotective, and anti-obesity effects, among others. For instance, leaf extracts have demonstrated potent antioxidant and antidiabetic effects in both animal models and clinical trials, while seed-derived isothiocyanates have shown significant antibacterial and anticancer activity. In addition, clinical and in vivo data support M. oleifera’s role in fertility regulation, cardiovascular protection, and neurodegenerative disease mitigation. Beyond its medicinal applications, the review highlights its growing use in functional foods, dietary supplements, and cosmeceutical products, reflecting its commercial and industrial relevance. By consolidating findings across disciplines, this review underscores the multifaceted value of M. oleifera as a nutraceutical and therapeutic resource.

13 June 2025 in Cosmetics
Verified
Journal Article
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Daniela BatovskaDaniela Batovska
Daniela Batovska
Natalina Konstantinova PanovaNatalina Konstantinova Panova
Natalina Konstantinova Panova
AGAnelia Tsvetanova Gerasimova
Anelia Tsvetanova Gerasimova
YTYulian Tumbarski
Yulian Tumbarski
IIIvan Georgiev Ivanov
Ivan Georgiev Ivanov
KNKrastena Nikolova
Krastena Nikolova
Chamomile essential oils (EOs) are widely used in cosmetics for their antioxidant, anti-inflammatory, and antimicrobial properties. Bulgaria, with its long-standing tradition in EO production, provides an ideal setting to examine the influence of species and cultivation practices on oil quality. This study compares the chemical composition and biological activity of EOs from German chamomile (Matricaria recutita L.) and Roman chamomile (Chamaemelum nobile L.), sourced from two major Bulgarian producers—Bulgarska Bilka Ltd. and Kateko Ltd. (Plovdiv, Bulgaria). Gas chromatography–mass spectrometry (GC–MS) profiling revealed species- and producer-dependent differences. German chamomile EOs were rich in β-farnesene, chamazulene, and bisabolol oxides, whereas Roman chamomile EOs were dominated by isobutyl angelate and related esters. Antioxidant activity, assessed via the ABTS assay, was higher in German chamomile EOs, especially from Bulgarska Bilka Ltd. The oils also showed photoprotective potential, with SPF values of 26–27 for German and 9–16 for Roman chamomile. Anti-inflammatory activity, evaluated by inhibition of albumin denaturation, was highest in Roman chamomile oils and comparable to that of prednisolone, while German chamomile also showed strong effects. Antimicrobial activity was generally low, with moderate effects observed only against Penicillium chrysogenum and Aspergillus flavus. These findings support the targeted use of chamomile EOs in cosmetics—German chamomile for antioxidant-rich, UV-protective, and microbiome-supportive care, and Roman chamomile for soothing, anti-inflammatory, and fragrance-enhancing applications.

1 April 2025 in Life
Verified
Journal Article
Open access
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Natalina Konstantinova PanovaNatalina Konstantinova Panova
Natalina Konstantinova Panova
AGAnelia Tsvetanova Gerasimova
Anelia Tsvetanova Gerasimova
YTYulian Tumbarski
Yulian Tumbarski
IIIvan Georgiev Ivanov
Ivan Georgiev Ivanov
MTMina Todorova
Mina Todorova
KNKrastena Nikolova
Krastena Nikolova
Background: Moringa oleifera is one of the most famous plants used for medicinal purposes. Its leaf extracts have antimicrobial activity and antioxidant activities, and reduce swelling in ulcers. Objectives: The present article aimed to determine the metabolic profile of Moringa oleifera leaf extracts from two samples originating from India and to evaluate in vitro and ex vivo their biological activities. Methods: The antioxidant properties of Moringa oleifera leaf extracts (methanol, 50% ethanol, and 70% ethanol) were studied in vitro for antimicrobial, anti-inflammatory, and antioxidant activities. The ex vivo contractile effects of the extracts were determined by assaying circularly isolated smooth muscle (SM) strips from a rat’s stomach. Results: The obtained results indicated that one of the samples had amino acid and organic acid content approximately twice that of the second sample. In all the tests, the 50% ethanol extract of both samples showed better antioxidant activity (209 mM TE 100 g−1 for the DPPH method). The 70% ethanolic extract of Sample 1 exhibited the strongest antimicrobial activity, inhibiting Gram-positive Bacillus cereus, Bacillus subtilis, and Staphylococcus aureus. The 50% ethanolic extract of both samples exhibited the highest anti-inflammatory activity, demonstrating a twice better effect than the reference drug diclofenac. Finally, the pre-incubation of SM preparations with both samples significantly enhanced the ACh-induced contractile response, increasing it by 134% and 111%, respectively. Conclusions: The findings suggested potential applications of Moringa oleifera as a suitable candidate for antimicrobial, antioxidant, anti-inflammatory, and antispasmodic supplementation for alternative pharmaceutical and nutraceutical products.

6 November 2025 in Cosmetics
Verified
Journal Article
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KHKatya Hutova
Katya Hutova
Velichka AndonovaVelichka Andonova
Velichka Andonova
Natalina Konstantinova PanovaNatalina Konstantinova Panova
Natalina Konstantinova Panova
IIIvan Georgiev Ivanov
Ivan Georgiev Ivanov
KNKrastena Nikolova
Krastena Nikolova
Viliana GuglevaViliana Gugleva
Viliana Gugleva
Background: Creams are one of the most used cosmetic formulations due to their hydrating and restoring properties, pleasant texture, and the possibility to deliver hydrophobic and hydrophilic active ingredients. The study aims to develop and characterize cosmetic creams based on natural-sourced ingredients—different vegetable oils from the Rosacea family: (1) Chaenomelis japonica seed oil, (2) Rosa canina seed oil, (3) Prunus armeniaca kernel oil, alone and in combination (4), along with silk protein (sericin) and astaxanthin. Methods: The creams were prepared by the hot homogenization method and were characterized in terms of rheological properties, spreadability, and antioxidant activity. Results: Two suitable formulations were selected as feasible for cosmetic application—the model containing Chaenomelis japonica seed oil exhibiting the highest antioxidant activity (47% higher vs. the model based on rosehip oil by FRAP method) and the highest spreadability values among the tested formulations (ranging between 61.57 and 69.34 mm). The second selected optimal formulation is the model based on a combination of oils characterized by the most suitable consistency and high antioxidant activity. Conclusions: The differences in their rheological behavior suggest as feasible application of Japanese quince oil cream its use as a daycare antioxidant cream, whereas the mixed oils-based cream model may potentially serve as a night cream for restorative and antioxidant care.

3 January 2026 in Journal of Chemical Technology and Metallurgy
Verified
Journal Article
Open access
KNKrastena Nikolova
Krastena Nikolova
Natalina Konstantinova PanovaNatalina Konstantinova Panova
Natalina Konstantinova Panova
AGAnelia Tsvetanova Gerasimova
Anelia Tsvetanova Gerasimova
YTYulian Tumbarski
Yulian Tumbarski
IIIvan Georgiev Ivanov
Ivan Georgiev Ivanov
Galia GentschevaGalia Gentscheva
Galia Gentscheva
The present study aimed to investigate the chemical composition and biological activity of yarrow essential oil (Achillea millefolium) from Bulgaria. Gas chromatography-mass spectrometry (GC-MS) analysis, total reflection X-ray fluorescence (TXRF) technique, antioxidant activity (ABTS and DPPH methods), antimicrobial activity tests were used. Through an optimized procedure with Ga as an internal standard, thirteen elements - S, Cl, K, Ca, Cr, Mn, Fe, Ni, Cu, Zn, Se, and Br - were quantified. The highest concentrations were observed for S, Ca, and Fe (12.35 - 7.26 mg kg⁻¹), followed by Cl, K, Ni, Cu, and Zn (2.23 - 0.53 mg kg-1). The dominant compounds identified by GC-MS analysis are monoterpene hydrocarbons, of which α-pinene (41.29 %) and β-pinene (27.15 %), limonene and p-cymene are predominant. The ABTS method a moderate degree radical neutralization with an IC50 value of 9.15 ±0.01 µg mL-1, while the DPPH method had a significantly lower IC50 of 205.00 ± 0.03 µg mL-1, indicating selective antioxidant activity depending on the type of radicals. The maximum inhibition observed at 100 µg mL-1 reached 95.13 % with the ABTS method and 29.82 % with the DPPH method. Bulgarian yarrow essential oil shows moderate activity against some Gram-negative bacteria, such as K. pneumoniae. and weak inhibitory activity against other pathogens, such as Staphylococcus aureus and Escherichia coli. It does not show activity against the molds Aspergillus niger and Aspergillus flavus.

5 October 2025 in Antioxidants
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Journal Article
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Abdessamad BeraichAbdessamad Beraich
Abdessamad Beraich
Daniela BatovskaDaniela Batovska
Daniela Batovska
KNKrastena Nikolova
Krastena Nikolova
Burak DikiciBurak Dikici
Burak Dikici
GGGöksen Gören
Göksen Gören
ATAbdelmonaem Talhaoui
Abdelmonaem Talhaoui
Mastic gum from Pistacia lentiscus L. has long been valued in Mediterranean medicine and food preservation, yet its bioactive potential remains underexplored in specific geographic contexts. In Morocco, the resin—locally known as Meska Horra—is abundant but insufficiently characterized. This study compared three extraction methods—cold maceration (CM), Soxhlet extraction (SE), and ultrasound-assisted extraction (UAE)—using sequential acetone and 70% ethanol to recover complementary phenolic compounds from defatted resin. Targeted UHPLC–ESI–MS/MS profiling identified and quantified 30 phenolics, mainly flavonoids and phenolic acids, providing the first systematic dataset for Moroccan mastic gum. UAE–EtOH extract displayed the strongest antioxidant activity (DPPH IC50 = 0.029 mg/mL; ABTS•+ IC50 = 0.026 mg/mL). SE–acetone and SE–EtOH extracts showed potent antifungal activity, particularly against Geotrichum candidum, Rhodotorula glutinis, and Aspergillus niger (MBC = 1.7%). The SE–acetone extract exhibited cytotoxicity toward MIA PaCa-2 pancreatic cancer cells (IC50 = 19 µg/mL). These findings demonstrate that extraction method and solvent choice strongly influence phenolic recovery and associated bioactivities, supporting the valorization of Moroccan mastic gum as a promising source for nutraceutical and pharmaceutical applications.