Browsing by Author "Gubenia O."

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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 %.