Wyniki wyszukiwania - AGRO

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Changes in contents and biological value of tocopherols in rapeseed deodorized condensates

100%

Szeliga M., Gogolewski M., Piasecka-Kwiatkowska D.

Food Science and Technology. Scientific Papers of Agricultural University of Poznan

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1997

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tom 01

2

Determination of tocopherols by packed column supercritical fluid chromatography [SFC]

88%

Buskov S., Jorgensen S. S., Sorensen H.

Polish Journal of Food and Nutrition Sciences

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1999

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tom 08

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nr 3

Supercritical fluid chromatographic (SFC) separations of a-tocopheryl acetate, α-, ß-, y- and -tocopherol have been achieved on a Spherisorb S3 ODS2 column in about 15 minutes. Separation efficiency of this method has been optimised with respect to the effect of pressure, percent of methanol in the mobile phase, temperature and flow rate, resulting in theoretical plate numbers (N) varying from 63000 to 90000 per metre. Linear correlations have been found between log k' (retention factor) and fluid density for all of the tested compounds, and a van't Hoff plot yielded linear correlation between log k' and T-1 at constant mobile phase density. Linearity and repeatability were found to be acceptable with detection limits from approximately 20 ng for α-, ß-, y- and ő-tocopherol to 10 ng for a-tocopheryl acetate at a signal to noise ratio = 3. Results obtained by use of the developed SFC method to determination of tocopherols in plant oils obtained by SFE (supercritical fluid extraction) and by aqueous enzymatic processing are presented.

3

Berry seed oils as a source of bioactive compounds in functional foods

75%

Martysiak-Zurowska D.

Polish Journal of Food and Nutrition Sciences

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2011

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tom 61

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nr Suppl.1

4

Identification of hydroxy-plastochromanol in Arabidopsis leaves

75%

Szymanska R., Kruk J.

Acta Biochimica Polonica

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2010

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tom 57

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nr 1

105-108

In the present study we have identified hydroxy-plastochromanol in plants for the first time. This compound was found both in low light and high light-grown Arabidopsis plants, however, under high light stress its level was considerably increased. Hydroxy-plastochromanol accumulated also during ageing of leaves of low light-grown plants, similarly as in the case of other prenyllipids. Our results indicate that hydroxy-plastochromanol found in leaves is probably formed as a result of plastochromanol oxidation by singlet oxygen generated in photosystem II during photosynthesis. These data also support the hypothesis that plastochromanol is an efficient antioxidant in vivo, similarly as tocopherols and plastoquinol.

5

Lipid characteristics of walnuts [Juglans regia L.]

75%

Nowak-Polakowska H., Bojarska J. E., Czaplicki S., Lojko R.

Polish Journal of Natural Sciences

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2005

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tom 18

187-198

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Tocochromanols, plastoquinone and polyprenols in selected plant species from Chilean Patagonia

75%

Strzalka K., Szymanska R., Swiezewska E., Skorupinska-Tudek K., Suwalsky M.

Acta Biologica Cracoviensia. Series Botanica

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2009

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tom 51

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nr 1

39-44

A collection of 14 species of Patagonian plants was evaluated for tocopherol content and composition, plastochromanol, plastoquinone content and polyprenol composition. Total tocopherols varied from 35.77 µg/g in Mutisia decurrens to 798 µg/g in Philesia magellanica. In most cases tocopherol composition was dominated by α-tocopherol, which accounted for more than 90% of total tocopherols. Of all the investigated species only Misodendrum punctulatum showed higher content of γ- than α-tocopherol, which is unusual for mature leaves. Plastochromanol, a homologue of γ-tocotrienol, was found in leaves of 10 of the 14 examined species, and was highest in Araucaria araucana leaves (132 µg/g). Total content of PQ-9 (oxidized and reduced) was highest in Fuchsia magellanica (774.3 µg/g), Philesia magellanica (791 µg/g), Misodendrum linearifolium (569 µg/g) and Amomyrtus luma (518.5 µg/g). Analysis of polyprenol content in the leaves of investigated plant species revealed detectable amounts (> 10 µg/g d.w.) of polyprenyl esters in six of them. Accumulation of free polyprenols was detected only in Chusquea quila leaves. Selected organs of Philesia magellanica and Fuchsia magellanica were further quantitatively analyzed for tocochromanol and polyprenol content. With the methods applied, different patterns of the analyzed compounds were identified in all the samples studied. Our results reveal some trends that may be of taxonomic interest. Some of these species can serve as a rich source of such bioactive compounds as tocochromanols or polyprenols.

7

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Degradation of tocopherols during rapeseed storage in simulated conditions of industrial silos

75%

Gawrysiak-Witulska M., Siger A., Rusinek R.

International Agrophysics

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2016

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tom 30

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nr 1

8

Influence of drying and storage on the lipophilic antioxidants content in rapeseed

75%

Nogala-Kalucka M., Siger A., Walczynska K., Jelen H., Gawrysiak-Witulska M.

Rośliny Oleiste - Oilseed Crops

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2006

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tom 27

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nr 2

9

Influence of ascorbic acid and tocoferol on Helicobacter pylori [H.p.] infection

75%

Rybicka J., Romanczyk T., Nowakowska M., Nowak A., Sierka E., Rogala-Zawada D.

Journal of Physiology and Pharmacology. Supplement

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1997

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tom 48

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nr 1

10

Preliminary characterization of S-adenosylmethionine: tocopherol methyltransferase from chloroplasts of Calendula officinalis seedlings

75%

Michalowski M., Janiszowska W.

Acta Biochimica Polonica

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1993

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tom 40

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nr 1

11

Changes of quantities of tocopherols and their dimers during storage of soya-bean oil under N2 and under air

75%

Gogolewski M., Galuba G., Bartkowiak-Fludra E., Jasinska-Stepniak A.

Food Science and Technology. Scientific Papers of Agricultural University of Poznan

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2000

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tom 04

12

Effects of gamma irradiation and menadione [vit.K3] on dissolution and dimerization of homologous tocopherols. Effect of storage time. Part two

75%

Kupczyk B., Gogolewski M.

Food Science and Technology. Scientific Papers of Agricultural University of Poznan

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1999

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tom 03

13

Natural antioxidants in seeds of winter rapeseed (Brassica napus L.)

63%

Zukalova H., Vasak J.

Rośliny Oleiste - Oilseed Crops

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1998

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tom 19

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nr 1

14

Nowa etylopochodna delta-tokoferolu - wlasciwosci przeciwutleniajace w stosunku do beta-karotenu

63%

Jasinska-Stepniak A., Gogolewski M.

Bromatologia i Chemia Toksykologiczna

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2001

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tom 34

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nr 1

73-77

W pracy otrzymano etylopochodną δ-tokoferolu metodą chloroalkilacji celem ustalenia jej skuteczności w stosunku do ß-karotenu. Praca jest kontynuacją badań nad oceną właściwości przeciwutleniających etylowej pochodnej δ-tokoferolu - przebadano zmiany liczby nadtlenkowej prób smalcu z dodatkiem tokoferoli i pochodnej δ-tokoferolu, a także określono rozpad antyoksydantów podczas przechowywania prób smalcu.

15

Composition and antioxidative activities of supercritical CO2-extracted oils from seeds and soft parts of northern berries

63%

Yang B., Ahotupa M., Maatta P., Kallio H.

Polish Journal of Food and Nutrition Sciences

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2011

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tom 61

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nr Suppl.1

16

Changes in composition of phenolic compounds and tocopherols in broccoli heads during short-term storage

63%

Kaluzewicz A., Lisiecka J., Gasecka M., Waskiewicz A., Krzesinski W., Spizewski T., Fraszczak B.

Żywność Nauka Technologia Jakość

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2016

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tom 23

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nr 3

Broccoli (Brassica oleracea L. var. italica) contains numerous biologically active compounds. However, their levels change during processing and storage. The objective of the research study was to determine the effect of short-term storage (1 ÷ 4 days) of broccoli heads at different temperatures (3 ºC, 16 ºC, and 21 ºC) on the contents of phenolic acids, selected flavonoids (quercetin and kaempferol), and tocopherols. Broccoli heads were harvested in autumn when they reached their maximum size and their buds were 2 mm in diameter. The content of phenolics and tocopherols depended on the storage time of broccoli heads. The lowest content of phenolics was found immediately after the broccoli was harvested, whereas the highest content thereof was reported after 4 days of storage. However, the storage temperature did not impact the contents of those compounds. In the research study, the content of caffeic acid was reported to be highest in the fresh broccoli heads; the content of sinapic acid was the second-highest, and that of the ferulic acid was the third-highest. The content of kaempferol in the broccoli heads was higher than that of quercetin. No differences were reported in the content of quercetin and kaempferol at particular storage temperatures on every single day of the experiment. An increase was reported only when compared with the control sample (the 0 day of storage). In the broccoli heads, the predominant tocopherol was α-tocopherol. The lowest loss in the total tocopherols occurred while storing at a temperature of 3 ºC and the highest: at a temperature of 21 ºC.

17

Singlet oxygen scavenging by tocopherol and plastochromanol under photooxidative stress in Arabidopsis thaliana

63%

Yadav D., Rastogi A., Szymanska R., Kruk J., Sedlarova M., Pospisil P.

BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology

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2013

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tom 94

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nr 2

18

Effects of gamma irradiation on sugars, fatty acids and tocopherols of chestnuts (Castanea sativa Miller)

63%

Barros L., Antonio A. L., Barreira J. C. M., Fernandes A., Bento A., Botelho M. L., Ferreira I. C. F. R.

Polish Journal of Food and Nutrition Sciences

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2011

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tom 61

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nr Suppl.1

19

Badania efektywnosci przeciwutleniaczy oraz spadku zawartosci tokoferoli w ukladach modelowych w testach utleniania tluszczow

63%

Nogala-Kalucka M., Lampart-Szczapa E., Korczak J., Pacynska K., Siger A.

Rośliny Oleiste - Oilseed Crops

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2004

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tom 25

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nr 1

251-262

20

Expression of the gene coding for barley 4-hydroxy-methylpyruvate dioxygenase during leaf senescence and oxidative stress

63%

Falk J., Kleber-Janke T., Krauss N., Krupinska K.

Biological Bulletin of Poznań. Supplement

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1997

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tom 34

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