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Wyszukujesz frazę "Sorensen, S." wg kryterium: Autor


Wyświetlanie 1-2 z 2
Tytuł:
Comparison of commonly used extraction methods for ergosterol in soil samples
Autorzy:
Sae-Tun, O.
Maftukhah, R.
Noller, C.
Remlinger, V.I.
Meyer-Laker, V.
Sorensen, A.C.T.
Sustic, D.
Socianu, S.I.
Bernardini, L.G.
Mentler, A.
Keiblinger, K.M.
Powiązania:
https://bibliotekanauki.pl/articles/2082954.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
soil
alkaline extraction
ergosterol extraction
glass bead beating
ultrasonication extraction
Opis:
Concerning the contribution of fungi to soil carbon sequestration, various methods have been used to extract ergosterol from soil samples. This study aims to explore the extraction ability and applicability of commonly used methods to extract ergosterol from two contrasting soils. An agricultural soil (chernozem) and a forest soil (podzol) were extracted with different types of cell lysis such as alkaline, glass bead, and ultrasonication methods in association with simple shaking. The ergosterol concentration was measured by high pressure liquid chromatography. Regardless of the method applied, ergosterol yield was higher in podzol than in chernozem. Alkaline extraction resulted in the highest ergosterol concentrations for both soils and miniaturized glass bead extraction produced comparable results in the case of chernozem. In terms of applicability, the non-alkaline methods were simpler to conduct and less demanding of labour, chemical use and glassware and more flexible in terms of the equipment used for mechanical disruption. Despite the limit of the two soil types in the present study, only the simple shaking method was revealed to be dependent on soil type. Based on our results, we recommend the miniaturized glass bead method for agricultural soils, low in organic matter for high throughput. However, not all of the methods described allow for the proper separation of coextracted organic substances from organic-rich soil.
Źródło:
International Agrophysics; 2020, 34, 4; 425-432
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quantitative extraction of oil from plant material with supercritical carbon dioxide
Autorzy:
Buskov, S.
Sorensen, H.
Sorensen, J.C.
Sorensen, S.
Powiązania:
https://bibliotekanauki.pl/articles/1373047.pdf
Data publikacji:
1997
Wydawca:
Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
Tematy:
oil seed
carbon dioxide
oil
carotenoid
chlorophyll
phospholipid
extraction
oilseed rape
Brassicaceae
lupin
oil content
supercritical fluid extraction
plant material
Opis:
Supercritical fluid extraction (SFE) both with CO2 and CO2/hexane has been developed as a method of analysis for lipids in cruciferous oilseed, rapeseed products and lupin. The SFE procedure used for quantitative determination of oil was compared to traditional Soxhlet oil extraction. The quantitative values obtained with SFE were equal to those obtained with the Soxhlet procedure with respect to oil and fat contents. The oil obtained by SFE had a much lower phosphorus content (below 14 mg/kg compared to 200-530 mg/kg in oil obtained with Soxhlet). When adding hexane to the supercritical fluid in concentrations varying from 50 to 150 mL/L CO2, the solubility of oil in the fluid could be raised up to 600%, from about 30 mg/g without addition of modifier to nearly 200 mg/g when using continuous addition of 150 mL hexane/ L CO2. The phosphorus content was still lower than in oil from Soxhlet (20-64 mg/kg). Therefore, extraction of oil with SFE opens the possibility for selective removal of oil before separate extraction and determination of amphiphilic compounds, e.g. phospholipids. The carotenoid and chlorophyl content in different oils from SFE and Soxhlet were evaluated by UV-VIS determinations. The presence of other amphiphilic compounds was verified and sinapic acid was found to be a quantitatively dominating phenolic compound.
Źródło:
Polish Journal of Food and Nutrition Sciences; 1997, 06, 3; 115-124
1230-0322
2083-6007
Pojawia się w:
Polish Journal of Food and Nutrition Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-2 z 2

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