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| Description
| - The phenolic compounds p-hydroxyacetophenone and catechin have been extracted from Norway spruce needles with pure methanol, 80 and 50% (v/v) aqueous methanol, pure acetonitrile, 80% (v/v) aqueous acetonitrile, and pure water. Extraction efficiency of the individual solvents was compared. Although 80% aqueous methanol is the solvent most frequently used for extraction of soluble phenolic compounds from needles, it was found that pure methanol is a more suitable extraction solvent. Surprisingly, a two-step procedure based on the extraction of crushed needles with water then re-extraction with methanol proved a good alternative to direct extraction with methanol. Extraction of uncrushed spruce needles might indicate that relatively more p-hydroxyacetophenone than catechin was located in the surface layer of the needle.
- The phenolic compounds p-hydroxyacetophenone and catechin have been extracted from Norway spruce needles with pure methanol, 80 and 50% (v/v) aqueous methanol, pure acetonitrile, 80% (v/v) aqueous acetonitrile, and pure water. Extraction efficiency of the individual solvents was compared. Although 80% aqueous methanol is the solvent most frequently used for extraction of soluble phenolic compounds from needles, it was found that pure methanol is a more suitable extraction solvent. Surprisingly, a two-step procedure based on the extraction of crushed needles with water then re-extraction with methanol proved a good alternative to direct extraction with methanol. Extraction of uncrushed spruce needles might indicate that relatively more p-hydroxyacetophenone than catechin was located in the surface layer of the needle. (en)
- Fenolické látky p-hydroxyacetofenon a katechin byly extrahovány z jehličí smrku ztepilého čistým, 80% ním a 50% ním metanolem, čistým a 80% ním acetonitrilem a destilovanou vodou. Byla srovnávána účinnost extrakce jednotlivými rozpouštědly. Ačkoli nejčastěji používaným činidlem pro extrakci rozpustných fenolických látek z jehličí je 80% ní metanol, bylo zjištěno, že nejvhodnějším extrakčním činidlem je čistý metanol. Překvapivě dobrou alternativou přímé extrakce metanolem je dvoustupňová procedura založená na extrakci rozdrceného jehličí vodou a následně metanolem. Extrakce nerozdrcených smrkových jehlic vede k domněnce, že p-hydroxyacetofenon je zřejmě větší měrou přítomen ve vrchní vrstvě jehlice než katechin. (cs)
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| Title
| - Extraction of p-hydroxyacetophenone and catechin from Norway spruce needles. Comparison of different extraction solvents
- Extrakce p-hydroxyacetofenonu a katechinu z jehličí smrku ztepilého (cs)
- Extraction of p-hydroxyacetophenone and catechin from Norway spruce needles. Comparison of different extraction solvents (en)
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| skos:prefLabel
| - Extraction of p-hydroxyacetophenone and catechin from Norway spruce needles. Comparison of different extraction solvents
- Extrakce p-hydroxyacetofenonu a katechinu z jehličí smrku ztepilého (cs)
- Extraction of p-hydroxyacetophenone and catechin from Norway spruce needles. Comparison of different extraction solvents (en)
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| skos:notation
| - RIV/60461373:22340/05:00014766!RIV06-MSM-22340___
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| http://linked.open.../vavai/riv/strany
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| http://linked.open...avai/riv/aktivita
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| http://linked.open...avai/riv/aktivity
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| http://linked.open...iv/cisloPeriodika
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| http://linked.open...vai/riv/dodaniDat
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| http://linked.open...aciTvurceVysledku
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| http://linked.open.../riv/druhVysledku
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| http://linked.open...iv/duvernostUdaju
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| http://linked.open...titaPredkladatele
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| http://linked.open...dnocenehoVysledku
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| http://linked.open...ai/riv/idVysledku
| - RIV/60461373:22340/05:00014766
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| http://linked.open...riv/jazykVysledku
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| http://linked.open.../riv/klicovaSlova
| - picea abies; phenolic compounds; extraction (en)
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| http://linked.open.../riv/klicoveSlovo
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| http://linked.open...odStatuVydavatele
| - DE - Spolková republika Německo
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| http://linked.open...ontrolniKodProRIV
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| http://linked.open...i/riv/nazevZdroje
| - Analytical and Bioanalytical Chemistry
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| http://linked.open...in/vavai/riv/obor
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| http://linked.open...ichTvurcuVysledku
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| http://linked.open...cetTvurcuVysledku
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| http://linked.open...UplatneniVysledku
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| http://linked.open...v/svazekPeriodika
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| http://linked.open...iv/tvurceVysledku
| - Sýkora, David
- Vosmanská, Magda
- Kovářová, M.
- Volka, Karel
- Fähnrich, Jan
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| http://linked.open...n/vavai/riv/zamer
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| issn
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| number of pages
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| http://localhost/t...ganizacniJednotka
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| is http://linked.open...avai/riv/vysledek
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