In the contemporary reality of globalization and urbanization in Bulgaria, traditional empiric ethnobotanical knowledge is disappearing. The aim of our study was to check the attitude of a random sample of people to the herbs and the traditional way of healing: 1) to find out which herbs are the most popular in Bulgaria; 2) what is their most popular application; 3) to study the distribution of negative or positive attitudes to the traditional use of medicinal plants according to age and gender of Bulgarian people. In total, 77 plant species (including the ones in the formula combinations) were mentioned during the study. They belong to 38 families. The most important families are Lamiaceae, Rosaceae, Asteraceae and the plants which most commonly referred to as "Granny's cure" were Hypericum perforatum, Cotinus coggigria, Plantago major, Sempervivum sp. div., Calendula officinalis, Melissa officinalis, Allium sativum, Aesculus hippocastanum, Matricaria chamomilla and Cornus mass. The greatest number of herbs were the ones used to treat disorders of central nervous system (CNS), bones, skin, gastro-intestinal and respiratory system.

Oregano oil (OrO) possesses well-pronounced antimicrobial properties but its application is limited due to low water solubility and possible instability. The aim of this study was to evaluate the possibility to incorporate OrO in an aqueous dispersion of chitosan—alginate nanoparticles and how this will affect its antimicrobial activity. The encapsulation of OrO was performed by emulsification and consequent electrostatic gelation of both polysaccharides. OrO-loaded nanoparticles (OrO-NP) have small size (320 nm) and negative charge (−25 mV). The data from FTIR spectroscopy and XRD analyses reveal successful encapsulation of the oil into the nanoparticles. The results of thermogravimetry suggest improved thermal stability of the encapsulated oil. The minimal inhibitory concentrations of OrO-NP determined on a panel of Gram-positive and Gram-negative pathogens (ISO 20776-1:2006) are 4–32-fold lower than those of OrO. OrO-NP inhibit the respiratory activity of the bacteria (MTT assay) to a lower extent than OrO; however, the minimal bactericidal concentrations still remain significantly lower. OrO-NP exhibit significantly lower in vitro cytotoxicity than pure OrO on the HaCaT cell line as determined by ISO 10993-5:2009. The irritation test (ISO 10993-10) shows no signs of irritation or edema on the application site. In conclusion, the nanodelivery system of oregano oil possesses strong antimicrobial activity and is promising for development of food additives.

A b s t r a c tSolid, nanoporous silica-based spherical mesoporous MCM-41 and KIL-2 with interparticle mesoporosity as well as nanosized zeolite BEA materials differing in morphology and pore size distribution, were used as carriers for the preparation of resveratrol-loaded delivery systems. Two preparation methods have been applied: (i) loading by mixing of resveratrol and mesoporous carrier in solid state and (ii) deposition in ethanol solution. The parent and the resveratrol loaded carriers were characterized by XRD, TEM, N2 physisorption, thermal analysis, and FT-IR spectroscopy. The influence of the support structure on the adsorption capacity and the release kinetics of this poorly soluble compound were investigated. Our results indicated that the chosen nanoporous silica supports are suitable for stabilization of trans-resveratrol and reveal controlled release and ability to protect the supported compound against degradation regardless of loading method. The solid-state dry mixing appears very effective for preparation of drug formulations composed of poorly soluble compound.

In the current context of the COVID-19 pandemic, it appears that our scientific resources and the medical community are not sufficiently developed to combat rapid viral spread all over the world. A number of viruses causing epidemics have already disseminated across the world in the last few years, such as the dengue or chinkungunya virus, the Ebola virus, and other coronavirus families such as Middle East respiratory syndrome (MERS-CoV) and severe acute respiratory syndrome (SARS-CoV). The outbreaks of these infectious diseases have demonstrated the difficulty of treating an epidemic before the creation of vaccine. Different antiviral drugs already exist. However, several of them cause side effects or have lost their efficiency because of virus mutations. It is essential to develop new antiviral strategies, but ones that rely on more natural compounds to decrease the secondary effects. Polysaccharides, which have come to be known in recent years for their medicinal properties, including antiviral activities, are an excellent alternative. They are essential for the metabolism of plants, microorganisms, and animals, and are directly extractible. Polysaccharides have attracted more and more attention due to their therapeutic properties, low toxicity, and availability, and seem to be attractive candidates as antiviral drugs of tomorrow.

Althaea officinalis (Malvaceae) is a well-known plant that is widely distributed throughout the world. Aqueous and hydroalcoholic extracts from A. officinalis root are used mainly because of their antitussive and expectorant activity. It is well known that these activities are based on the polysaccharide composition, but little is known about the possible antioxidant activity of root extract. The present study evaluated antioxidant activity of root extracts prepared with different extraction solvents applying ABTS·+ (2,2′-azino-bis(3-ethylbenzothiazoline-6-sulphonic acid), hypochlorous acid scavenging assay and iron-induced lipid peroxidation. The results showed that the extract prepared with water as extraction solvent did not possess antioxidant activity, whereas the extracts obtained using ethanol:water as extraction agent showed well pronounced antioxidant activity. In particular, the extracts obtained at low concentration of ethanol in the mixed solvent (50:50 and 70:30, v/v) showed higher scavenging activity for ABTS·+ radicals and hypochlorite ions than the extract obtained with the higher ethanol concentration (90:10, v/v). These results correlated very well with phenolic and flavonoid content of the extracts. The extracts did not show cytotoxic effect on human BV-173 leukemic cells but may have immunomodulating effects due to their antioxidant properties.

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In line with the well-established ethnobotanical use of Arum maculatum for the treatment of hemorrhoidal disease, we sought to determine the activities of 30% or 70% ethanol extracts of the plant tubers in an array of pharmacological and biochemical models of some crucial events implicated in the pathogenesis of this disorder, namely angiogenesis, collagenase activity remodeling, cyclooxygenase activity, IL-2 secretion and oxidative stress. The tested hydro-alcoholic extracts from A. maculatum tubers inhibited the proliferation of EA.hy926 vascular endothelial cells, but even at the highest administered concentrations no decrease in viability was observed. The extracts induced a concentration-dependent decrease in collagenase activity, whereby the effects were more pronounced at the lower concentration of ethanol in the extragent. Moreover the tested extracts induced concentration-dependent suppression of cyclooxygenase activity (COX-1 and 2), albeit at very high and presumably supraphysiological concentrations. The extracts augmented the PHA/PMA-induced secretion of IL-2 from Jurkat E.6 (human T-cells), which was more pronounced following exposure to the 30% ethanol-derived product. The 30% EtOH extract demonstrated anti-radical properties against both stable free radicals (ABTS and DPPH) and biologically relevant reactive oxygen species (ROS), which could be considered as important mediators of inflammation and signaling molecules. Our findings give us reason to conclude that the hydroalcoholic extracts of A. maculatum tubers possess anti-inflammatory, antiangiogenic and antioxidant effects which in concert could contribute to its efficacy for the management of hemorrhoidal disease.

Despite the existence of many relevant publications, and of reliable records of the traditional empiric data about medicinal plants in Bulgaria, over the last few years we found quite a lot of hitherto undocumented data about the healing properties of plants. In order to test the contemporary status of the traditional knowledge about medicinal plants, we performed the study as a Rapid Ethnobotanical Appraisal in the way of structured interview based on fixed questions namely what plants are used against certain health disorders. We therefore interviewed 183 people during the summer of 2011: some whom we knew to be particularly interested in medicinal plants and traditional ways of healing, and also a random sample of people of different ages. These subjects were all over l8. The survey was called "Granny had a cure for this." (or "Granny knew how to cure this.") In this paper we present data for remedial properties of popular medicinal plants which have not been documented in the literature yet -Pulsatilla pratensis -fresh leaves used as compress against exostoses, Sambucus ebulus -immature fresh leaves used for compress in case of exostoses, Primula veris -leaves infusion used against vertigo and Nepeta nuda -application of decoction internally against cystitis and prostate gland inflammation as well as externally against wounds and on the stock udder against mastitis. Comparative analysis of relevant studies was also done.