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Постійне посилання колекціїhttps://dspace.nuft.edu.ua/handle/123456789/7522
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Документ Study on antioxidants extraction from oak bark and their use for oxidation stability of sunflower oil(2021) Demydova, Anastasiia; Nosenko, Tamara; Bakhmach, Volodymyr; Shemanska, Evgenia; Molchenko, SvitlanaSuitable conditions of oak bark polyphenols extraction were developed in this study in order to use them as inhibitors of vegetable oil oxidation. It was shown that polyphenols of oak bark were effective as natural inhibitors of oil oxidation. It had been demonstrated that use of food acids in combination with a water-alcohol solvent and microwave field were effective for the enhancing of the extraction process of oak bark. The method of creation of the stable fat and hydrophilic antioxidants containing system was developedДокумент Application of enzymes for pressed oil production from pumpkin seeds(2023) Vovk, Hanna O.; Karnpakdee, Kwankao; Golubets, Olga; Levchuk, Irina; Ludwig, Roland; Nosenko, TamaraThe evaluation of cell integrity by immediate hexane extraction (shaking method) showed that all samples treated with different enzymes had a higher oil yield, ranging from 33.2 to 34.1 % of seed weight, than the control samples (32.1 %). The number of disrupted cells in enzyme treated samples was also higher than the control (64.4%), ranging from 67.6 to 69.5 %. The highest amount of damaged cells, 71.0 and 71.1 %, was found in the samples treated with mixtures (a) pepsin, Viscozyme L, pectinase and (b) pepsin, cellulase,pectinase. The yield of pressed oil from pumpkin seeds pretreated with the pepsin+ViscozymeL+pectinase mixture was by 7.0 % higher than that of the control sample. The enzymatic pretreatment did not significantly affect the free fatty acid content, peroxide value, fatty acid, and phytosterols composition. The antioxidant activity expressed as DPPH radical scavenging capacity of the pressed oil obtained from enzymatically pretreated pumpkin seeds was by 2.7 % higher than of control oil.Документ Comparative study of lipase preparations for enzymatic degumming of sunflower oil(2023) Nosenko, Tamara; Zhupanova, DianaEnzymatic degumming of sunflower oil results in an increase in oil yield compared with water degumming. Degumming with Quara®Boost preparation results in 98 % oil yield, which was 1.5 % higher than in the case of water degumming. Using Lecitase® Ultra and Quara Low P increased oil yield by 1 and 0.5 %, respectively, compared with water degumming. The phospholipid content decreased from 0.4 % in crude oil to 0.2 % after water degumming, meanwhile, the application of enzyme preparations Lecitase® Ultra and Quara Low P reduced the content of phospholipids to 0.08 % and 0.06 %, respectively. The lowest phospholipid (stearoiloleillecitin) content 0.04 % was in the sunflower oil after degumming with phospholipase C (Quara®Boost), which corresponds to 16 mg/kg of phosphorus. The saponification value of sunflower oil degummed with phospholipase C preparation proved the formation of diacylglycerols in oil and was 191.5 mg KOH/g. The highest free fatty acid content in sunflower oil was after degumming with Lecitase® Ultra: the acid value increased from 0.86 mg KOH/g in crude oil to 2.7 mg KOH/g in degumming oil. However, Quara Low P preparation also has phospholipase A1 activity, so, the acid value decreased slightly compared with crude oil. Degumming with Quara®Boost preparation did not affect the free fatty acid content in sunflower oil, and the acid value was even lower than in the oil degummed with water. The peroxide value of sunflower oil was <1 meq O/kg after enzymatic degumming, meanwhile the peroxide value of sunflower oil after water degumming was 2.6 meq O/kg. All oil samples had a similar antioxidative capacity, that was 30-36 % of scavenged DPPH• radical.Документ Tocopherol concentrates obtaining from deodorizer distillates of sunflower oil(2019) Demydova, Anastasiia; Nosenko, Tamara; Shemanska, Evgenia; Molchenko, SvitlanaThe developed method for the obtaining of a tocopherol concentrate from a by-product of the refining of oils a sunflower deodorizer distillate is economically profitable in comparison with existing methods. Using of the developed method for tocopherols concentrates obtaining does not require a multi-stage approach, which usually includes the distillation of deodorizer distillates and esterification of fatty acids and other components. And the resulting concentrates of tocopherols were effective antioxidant