Publications by authors named "Alexandra Kotogan"

Article Synopsis
  • Hydrolysis of various oils (olive, rapeseed, linseed, almond, peanut, grape seed, and menhaden) using commercial lipases showed effective degradation, especially with olive, rapeseed, peanut, and linseed oils.
  • Gas chromatography revealed significant increases (1.1 to 38.4 times) in beneficial fatty acids after treatment, such as palmitic, oleic, and linoleic acids, with menhaden oil yielding high levels of polyunsaturated fatty acids.
  • The antioxidant capacity improved in most oils post-treatment, and both lipase-treated and untreated oils demonstrated the ability to inhibit growth of food-borne bacteria, indicating potential health benefits from the lipid mixtures.
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β-Galactosidases of Mucoromycota are rarely studied, although this group of filamentous fungi is an excellent source of many industrial enzymes. In this study, 99 isolates from the genera , , , , and , were screened for their β-galactosidase activity using a chromogenic agar approach. Ten isolates from the best producers were selected, and the activity was further investigated in submerged (SmF) and solid-state (SSF) fermentation systems containing lactose and/or wheat bran substrates as enzyme production inducers.

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Phenolic compounds and extracts with bioactive properties can be obtained from many kinds of plant materials. These natural substances have gained attention in the food research as possible growth inhibitors of foodborne pathogenic and spoilage bacteria. Many phenolic-enriched plant extracts and individual phenolics have promising anti-quorum sensing potential as well and can suppress the biofilm formation and toxin production of food-related pathogens.

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Lipase enzymes of the oleaginous fungal group are rarely studied. However, considering that most commercial lipases are derived from filamentous fungal sources, their investigation can contribute to the cost-effective development of new biotechnological processes. Here, an extracellular lipase with a molecular mass of 30 kDa was isolated from CBS 575.

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NRRL 5282 and NRRL 1526 can produce lipases with high synthetic activities in wheat bran-based solid-state culture. In this study, the purification and biochemical characterization of the lipolytic activities of these lipases are presented. SDS-PAGE indicated a molecular mass of about 55 and 35 kDa for the purified and enzymes, respectively.

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Cellulolytic, lipolytic and proteolytic enzyme production of zygomycetes Mucor corticolus, Rhizomucor miehei, Gilbertella persicaria and Rhizopus niveus were investigated using agro-industrial wastes as substrates. Solid-state cultures were carried out on untreated corn residues (stalk and leaf) as single substrate (SSF1) or corn residues and wheat bran in mixed fermentation (SSF2). Rapid production of endoglucanase (CMCase) was observed with maximal activity reaching after about 48-h fermentation, while cellobiohydrolase (CBH) and β-glucosidase enzymes generally had their peak after 72-h incubation.

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