Browsing by Author "Georgieva D."

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    Antimicrobial active packaging paper based on dill weed essential oil
    (2020-01-01) Kostova I.; Lasheva V.; Georgieva D.; Damyanova S.; Stoyanova A.; Stefanov S.; Gubenia O.
    Antimicrobial active packaging based on dill weed essential oil (DWEO) was investigated. Three types of packaging paper (100% bleached pulp 40 g/m2, 100% unbleached pulp 40 g/m2, and 100% recycled paper weighing 70 g/m2) were analysed. The antimicrobial activity was tested against the Gram-positive bacteria Staphylococcus aureus ATCC 6538 and Bacillus subtilis ATCC 6633; the Gram-negative bacteria Escherichia coli ATCC 8739, Pseudomonas aeruginosa ATCC 9027 and Salmonella abony NTCC 6017; the yeast Saccharomyces cerevisiae ATCC 2601 and Candida albicans ATCC 10231; and the fungal strain Aspergillus brasiliensis ATCC 16404. The activity of the bleached paper treated with DWEO against moulds (Aspergillus brasiliensis) and yeasts (Candida albicans) during the five-day study period decreased from 100 to 47%, against Gram-positive bacreria (Staphylococcus aureus and Bacillus subtilis) decreased from 100 to 69%, and against Gram-negative bacteria (Salmonella abony and Escherichia coli) decreased from 76 to 12%. Unbleached paper, treated with DWEO, had stronger antimicrobial potential against Gram-positive bacteria (Staphylococcus aureus and Bacillus subtilis), compared to other test microorganisms. Recycled paper treated with DWEO showed fungicidal activity.
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    CHARACTERIZATION OF ACTIVE PAPER PACKAGING MATERIALS WITH CORIANDER ESSENTIAL OIL (CORIANDRUM SATIVUM L.)
    (2020-01-01) Kostova I.; Lasheva V.; Georgieva D.; Damyanova S.; Fidan H.; Stoyanova A.; Gubenia O.
    This study aims to investigate the antimicrobial activity of paper-based packaging materials including coriander (Coriandrum sativum L.) essential oil. Three types of packaging papers (bleached, unbleached, and recycled) are treated with an essential oil and then stored for 2 h, 24 h, and 5 days. The antibacterial activity of coriander oil is tested against Gram-positive bacteria (Staphylococcus aureus ATCC 6538 and Bacillus subtilis ATCC 6633); Gram-negative bacteria (Escherichia coli ATCC 8739, Pseudomonas aeruginosa ATCC 9027, and Salmonella abony NTCC 6017); an yeast (Candida albicans ATCC 10231), and a fungal strain (Aspergillus brasiliensis ATCC 16404). Ahigh fungicidal potential is observed in case of all packaging materials. The antimicrobial action of the bleached paper coated with coriander oil against Gram-positive bacteria during the five-day storage period decreases slightly from 100 % - 94 % to 79 % - 81 %.
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    Effect of clary sage (Salvia sclarea L.) essential oil on paper packaging materials
    (2020-01-01) Kostova I.; Lasheva V.; Fidan H.; Georgieva D.; Damyanova S.; Stoyanova A.
    Introduction. The aim of research to determine the effect of clary sage (Salvia sclarea L.) essential oil on paper packaging materials. Materials and methods. Three packaging materials have been studied based on paper coated with clary sage essential oil. The chemical composition of the clary sage essential oil is determined chromatographically. Antimicrobial effect of essential oil was determined against Gram-positive, Gram-negative bacteria, yeasts, and fungi using the agar diffusion method. Results and discussion. The chemical composition of the clary sage essential oil showed a predominant amount of oxygenated monoterpenes (83.43%), followed by monoterpene hydrocarbons (7.86%), and sesquiterpene hydrocarbons (5.16%). The major components of the clary sage essential oil were linalyl acetate, B-linalool, α-terpineol, limonene, and geranyl acetate that determined the antimicrobial action of the oil. The essential oil exhibited a fungicidal action against the tested molds and yeasts. Its high antimicrobial properties could be probably due to the high content of linalyl acetate (40.31%) and B-linalool (22.72%). Our results showed high fungicidal efficacy for the three types of packaging materials. The suppressive action against C. albicans during the investigated shelf life period was about 100%. It was found a high efficiency of the recycled paper against A. brasiliensis (99.2%-81.9%). It was determined that the bactericidal effect of the tested packaging materials was lower than the Gram-negative bacterium S. abony. Conclusions. Clary sage essential oil could be used as an antimicrobial agent in the food industry due to its antimicrobial properties, in order to improve the quality of the products and extend their shelf life.