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Wyszukujesz frazę "pulsed electric field" wg kryterium: Temat


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Tytuł:
Zastosowanie pulsacyjnego pola elektrycznego (PEF) jako zabegu wspomagającego ekstrację
Application of the pulsed electric field (PEF) as the extraction assistant treatment
Autorzy:
Nowosad, Karolina
Powiązania:
https://bibliotekanauki.pl/articles/2086741.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Chemiczne
Tematy:
ekstrakcja
pulsacyjne pole elektryczne
biopaliwo
związki fenolowe
browarnictwo
extraction
pulsed electric field
biofuel
phenolic compounds
brewing
Opis:
Fruits, vegetables and yeast contain numerous biologically active compounds called "phytonutrients". The phytonutrients can include phenolic compounds, minerals and vitamins. Conventional techniques used to extract these nutrients suffer from several disadvantages. These methods are characterized by poor efficiency of the extraction process, high energy and solvent consumption, long processing times and the formation of thermal decomposition by products. For this reason, scientists together with food engineers are looking for a safe and efficient extraction of bioactive compounds. In recent years, several modern techniques to support the extraction process have been proposed. One of them is the pulsed electric field (PEF). Pulsed electric field is one of the non-thermal methods used to control microbiological safety and change the properties (nutritional, sensory and physicochemical) of food products. The principle of operation of PEF is based on the formation of pores in the cell membrane under the influence of short bursts of electricity, which increases its permeability. Due to the formation of pores, various components, such as ions, molecules and other more complex compounds, such as vitamins or lipids, can flow freely through the cell membrane. The use of PEF for extraction reduces the process time, increases the efficiency of the process and is characterized by a low processing temperature. This review shows the use of a pulsed electric field as a process supporting the extraction of biological compounds from algae, vegetables, fruits and in the brewing industry. The optimal conditions of the pulsed electric field, which may affect the extraction efficiency, e.g. electric field strength, number of pulses and pulse width, are also discussed. Based on the collected literature data, it was found that the pulsed electric field contributes to the increase of the extraction efficiency.
Źródło:
Wiadomości Chemiczne; 2022, 76, 3-4; 207--220
0043-5104
2300-0295
Pojawia się w:
Wiadomości Chemiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Niekonwencjonalne metody ekstrakcji : ekstrakcja ekologiczna
Unconventional methods of extractions : green extraction
Autorzy:
Nowosad, Karolina
Sujka, Monika
Powiązania:
https://bibliotekanauki.pl/articles/972309.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Chemiczne
Tematy:
ekstrakcja ekologiczna
ekstrakcja płynem nadkrytycznym
ekstrakcja za pomocą ultradźwięków
ekstrakcja za pomocą pulsacyjnego pola elektrycznego
ekstrakcja za pomocą enzymów
green extraction
extraction with supercritical fluid
extraction using ultrasound
extraction using a pulsed electric field
extraction using enzymes
Opis:
Extraction is a method of extracting a chemical from a solution or mixture of solid substances. Conventional methods of extraction, for example, Soxhlet method, require the use of hazardous solvents, are time-consuming and cause degradation of the extracted compounds. Green extraction is characterized by the speed, it gives a quantitative recovery of the extract and does not cause degradation of the components. It takes place at a lower energy consumption than conventional extraction. A number of novel alternatives to conventional extraction techniques have been proposed, including ultrasonic assisted extraction (UAE), supercritical fluid extraction (SFE), enzyme extraction or pulsed electric field. These techniques allow to reduce or eliminate the use of toxic solvents, improve process efficiency and extract quality. The temperature of the above-mentioned processes is low, which affects the behavior of temperature-sensitive substances. The widely used "green extraction" is SFE - extraction with supercritical fluid. The solvent is a supercritical fluid, most often carbon dioxide. Ultrasonic extraction is environmentally friendly, easy to use, versatile and relatively cheap compared to other innovative techniques. This technique can be used to extract, for example, polysaccharides, essential oils, proteins, peptides, dyes, pigments and bioactive substances. Extraction with the use of pulsed electric field is used to extract mainly polyphenols and other bioactive components. Extraction with enzymes (mainly pectinases, cellulases and hemicellulases) is widely used in the food industry, eg for clarifying beer and juices. The extraction yield depends on the solvent system, temperature, enzyme function, substrate availability and pH.
Źródło:
Wiadomości Chemiczne; 2019, 73, 9-10; 465-479
0043-5104
2300-0295
Pojawia się w:
Wiadomości Chemiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-2 z 2

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