Artykuły (WBiNoŻ)

Stały URI dla kolekcjihttp://hdl.handle.net/11652/147

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2016 - 20193

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Autorsearch.filters.applied.operator.equals: search.filters.author.Olejnik, Tomasz P.

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Teraz wyświetlane 1 - 3 z 3
  • Pozycja
    The influence of selected process factors on the physicochemical and biological properties of honeys: A review
    (Wydawnictwo Politechniki Łódzkiej, 2019) Kowalska, Gabriela; Rosicka-Kaczmarek, Justyna; Olejnik, Tomasz P.; Dędek, Kamil
    Honey is one of the world's most valued natural food products. Characteristic, pleasant aroma, golden colour, sweet taste and healthpromoting properties cause a continuous increase of honey consumption in the European Union. The most wanted is regional honey. However, imported honey available on the market has often lower prices. The honey obtained can be heat treated, which reduces water content and can slow down the growth of the microorganisms, which are responsible for the undesirable fermentation of honey. Unprocessed honey appears to be the healthiest, but in practice, it’s often heat treated to slow down or back up the crystallization process and to make its dosage during technical processes easier. It is widely believed that heating of honey may have a harmful impact on its properties. There are countless articles of popular science, that warn of heating and cooking with honey. Should honey never be heated?The aim of this work is to give an overview of the influence of technical processes on the physicochemical and health-promoting properties of honey. The results demonstrated that the physicochemical and bioactive properties of honey are significantly affected by thermal treatment. As a result of the temperature, it comes to the Maillard reaction, during which HMF is synthesized. Furthermore, heating affects the activity of the enzymes contained in honey, among others, diastase and inverses. However, few studies made in this field show that honey heat treatment may work in favour of antioxidant properties. Depending on the type of honey, melanoidins may increase or decrease the antioxidant activity.
  • Pozycja
    Modification of bacterial cellulose to scaffold-like structures applied in process engineering
    (Lodz University of Technology Press, 2016) Kaźmierczak, Marta; Olejnik, Tomasz P.; Ogrodowczyk, Dominika; Kołodziejczyk, Marek
    Scaffolds are three-dimensional structures which provides necessary support for different cells’ vital functions. Although they are widely produced from different materials, most of them are not biodegradable. Bacterial bionanocellulose (BNC) has this property and additionally, has similar features to natural, extracellular matrixes. Unfortunately, natural channels which are in BNC’s structure have not sufficient diameter to colonize them with, for example, mammalian cells. Some experiments for pores enlargement in cellulose structure have been conducted. Multiple frosting and defrosting of properly prepared BNC’s samples has produced some positive results. Application the mixture of sterile vegetable oil and ethanol at the cultured layers of bionanocellulose gave expected results – diameter of the channels and chambers is enough to colonize them with viable cells. The results of described experiments give hope that bacterial bionanocellulose, because of its transformation’s simplicity, could be an alternative material for bioplastics productions.
  • Pozycja
    Economic analysis for biogas plant working at sugar factory
    (Lodz University of Technology Press, 2016) Ogrodowczyk, Dominika; Olejnik, Tomasz P.; Kaźmierczak, Marta; Brzeziński, Stanisław
    Biogas is produced by the biological processes of anaerobic methane fermentation. It is a mixture of methane, carbon dioxide and trace amounts of other gases. By-products of the sugar industry are an efficient source of agricultural biogas. Sugar beet pulp and waste mass plant is characterized by a high content of dry matter and organic dry. The purpose of this article was to develop the economic analysis for biogas plant working at sugar factory and to show the energy balances and material and then calculated the main economic indicators such as Cash Flow (CF), Net Present Value (NPV), Internal Rate of Return (IRR) and Discounted Payback Period (DPP). It was found that the biogas plant operating at a sugar factory can be a profitable investment and DPP amounted to 8 years. However, these results are estimates and in reality they may changed.