Wyniki wyszukiwania - Biblioteka Nauki

1

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

|

1999

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tom 08

|

nr 3

EN

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

Zastosowanie kwasu acetylosalicylowego i tokoferolu w farmakologicznej terapii zatrucia dioksyną – przegląd piśmiennictwa.

75%

Dobrzyński M. , Bazan J. , Rosińczuk-Tonderys J. , Pałka Ł. , Parulska O. , Całkosiński I.

Współczesne Pielęgniarstwo i Ochrona Zdrowia

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2013

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nr 4

81-84

PL

Zagrożenia środowiskowe wynikające ze skażenia trwałymi związkami organicznymi (TZO), do których należą również dioksyny, mimo ustawowych ograniczeń ich emisji, stanowią nadal istotny problem zdrowotny. Wynika to z pojawiania się nowych źródeł powstawania dioksyn oraz możliwości ich dostawania się zarówno bezpośrednio do żywności, jak i krążenia w łańcuchach pokarmowych. Przykładem pozaalimentarnego narażenia na dioksyny jest skażenie nimi środowiska stwierdzone w obszarze katastrofy World Trade Center w Nowym Yorku. Zaznaczyć należy, że monitoring stężenia tych związków zarówno w środowisku, jak i w żywności nie ma charakteru ciągłego i jest wyrywkowy. Dlatego kwestię narażenia ludzi na dioksyny stale podnosi się w mediach, m.in. w związku z nielegalnym spalaniem tworzyw sztucznych czy możliwością skażenia nimi żywności (np. tzw. afera kurczakowa czy afera solna). Antagonizm kwasu acetylosalicylowego i tokoferolu w stosunku do receptora AhR sugeruje możliwość wykorzystania tych leków jako środków ograniczających skutki zatrucia dioksynami. Celem pracy jest przegląd piśmiennictwa dotyczącego możliwości wykorzystania kwasu acetylosalicylowego i tokoferolu w ograniczaniu skutków zatrucia dioksyną.

EN

Environmental risks arising from contamination of persistent organic (POPs), which also include dioxins, are still a serious health problem. This results from the appearance of new sources of dioxin formation and their ability to contaminate food and enter the food chain. An example of beyond alimentary exposure to dioxin is environmental contamination found in the New York after attacks on World Trade Center. It should be noted that monitoring the concentration of these compounds, both in the environment and in food, is not continuous, but random. Therefore, the issue of human exposure to dioxins is constantly rising in the media, inter alia, in connection with the illegal burning of plastics and the possibility of contamination of food (eg, so-called. chicken or salt scandal). Antagonism of acetylsalicylic acid and tocopherol to the AhR receptor, suggests the possibility of using these drugs for limiting the effects of dioxin poisoning. Here we present the review about possible use of acetylsalicylic acid and tocopherol in reducing the effects of dioxin intoxication.

4

Identification of hydroxy-plastochromanol in Arabidopsis leaves

75%

Szymanska R. , Kruk J.

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tom 57

|

nr 1

105-108

EN

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

|

tom 18

187-198

6

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

|

tom 61

|

nr Suppl.1

7

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

75%

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

International Agrophysics

|

2016

|

tom 30

|

nr 1

8

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

|

nr 1

39-44

EN

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.

9

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

|

tom 27

|

nr 2

10

Identification of hydroxy-plastochromanol in Arabidopsis leaves

75%

Szymańska R. , Kruk J.

Acta Biochimica Polonica

|

2010

|

tom 57

|

nr 1

105-108

EN

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.

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

|

tom 04

12

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

|

tom 48

|

nr 1

13

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

75%

Michalowski M. , Janiszowska W.

Acta Biochimica Polonica

|

1993

|

tom 40

|

nr 1

14

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

|

1999

|

tom 03

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

|

2011

|

tom 61

|

nr Suppl.1

16

Zastosowanie tokoferolu i kwasu acetylosalicylowego w ochronie tkanki kostnej przed skutkami doświadczalnego zatrucia 2,3,7,8-tetrachloro-dibenzo-p-dioksyną (TCDD)

63%

Dobrzyński M. , Bazan J. , Gamian A. , Rosińczuk-Tonderys J. , Parulska O. , Całkosiński I.

Rocznik Ochrona Środowiska

|

2014

|

tom Tom 16, cz. 1

300--322

EN

Dioxins are released into the environment as by-products of technological processes, i.a. in the chemical industry, pulp and paper industry, metallurgical industry, textile industry and dyeing industry. Dioxins are a group of compounds recognized by the International Agency for Research on Cancer (IARC) as carcinogens of Group A since 01/06/1997. The carcinogenic action has been demonstrated on animals. Despite stringent obligations arising from the provisions of The Stockholm Convention on Persistent Organic Pollutants on reducing POPs emissions to the environment (including dioxins) emission of these substances is still significant. These compounds often enter the food chain in random or intentional way and accumulate in organisms in the top of the food chain. This leads to the poisoning of the organism and appearance of clinical symptoms. According to the real hazard of poisoning the people, especially employed in the chemical industry, who are exposed to dioxins, research to determine the impact of these xenobiotics on various tissues and organs as well as to develop of effective pharmacological prevention is constantly conducted. Despite of the wide spectrum of the assessment of dioxins biological effects among humans and animals, there are only a few publications evaluating the impact of dioxins on the bone tissue. The main components of the fully functional bone are calcium phosphates and magnesium phosphates. From the proper saturation of bone matrix with salts of these chemical elements (mineralization) depends the hardness and elasticity of the bone. The young bone mineralization is controlled by a group of proteins, from which the most important is osteonectin, osteocalcin and alkaline phosphatase. Many xenobiotics, including dioxins, have a negative influence on the biosynthesis of these proteins. The measurement of calcium and magnesium concentration in bone is one of the methods for assessing bone destruction. The aim of this study was to investigate the effect of 2,3,7,8-tetrachlorodobenzo-p-dioxin (TCDD) in rats on calcium and magnesium levels in bone tissue of their offspring. Moreover the aim of this study was to check whether the administration of the dioxin receptor antagonists – tocopherol and acetylsalicylic acid – can reduce negative effects of dioxin action. Study was performed on 2-day newborns of Buffalo strain rats. Lower levels of calcium and magnesium was found both in cranial vault bones and the knee from newborns of mothers exposed to 2,3,7,8-tetrachlorodibenzo-p-dioxin. It was shown that administration of mothers exposed to 2,3,7,8- tetrachlorodibenzo-p-dioxin tocopherol or acetylsalicylic acid prevent decreases in calcium and magnesium concentrations in the bone tissue of the offspring.

17

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

|

tom 61

|

nr Suppl.1

18

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

63%

Jasinska-Stepniak A. , Gogolewski M.

Bromatologia i Chemia Toksykologiczna

|

2001

|

tom 34

|

nr 1

73-77

PL

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.

EN

The aim of this work was to develop new antioxidants. Synthesis of δ-tocopherol was carried out which yielded ethyl-δ-tocopherol. The effect of addition of the antioxidant on β-carotene was tested by a modified Bickoff test. It was found that the antioxidant activity of the new δ-tocopherol toward β-carotene was lower than that of δ- and y-tocopherols.

19

Wykorzystanie składników ekstraktu z liści orzecha włoskiego Juglans regia L do zwalczania grzybów z gatunku Ascosphaera apis

63%

Garbaczewska S. , Cieniecka-Rosłonkiewicz A. , Michalczyk A. , Kielczewska A.

Chemik

|

2014

|

tom Vol. 68, nr 2

117--122

PL

Zarodniki grzyba z gatunku Ascosphaera apis wywołują u pszczół grzybicę wapienną (otorbielakową), inaczej zwaną askosferiozą. Porażenie askosferiozą powoduje zamieranie czerwiu i jego mumifikację. Zbadano wpływ ekstraktu z liści orzecha i otrzymanych w wyniku jego chromatograficznego rozdziału frakcji na liniowy wzrost grzybni A. apis w warunkach in vitro na podłożu agarowym. Aktywność ekstraktu z liści była niewielka i wynosiła 45%, natomiast jedna z otrzymanych z jego rozdziału frakcji wykazywała 80% zahamowania rozwoju grzybni. Zawartość aktywnej frakcji zidentyfikowano metodą GC-MS i DI-MS i IR. Zbadano przeciwgrzybiczewłaściwości juglonu – substancji aktywnej obecnej w ilości 0,3% (GC-MS) w badanej frakcji. Wyznaczono MIC juglonu dla A. apis, które wynosiło 2500 mg/l. Stwierdzono również 58,6% (GC-MS) zawartość -tokoferolu, dlatego zbadano jego wpływ na hamowanie rozwoju A. apis. Nie zaobserwowano jednak inhibicji wzrostu grzybni. Zbadano także właściwości przeciwgrzybicze eugenolu występującego w ilości 4,7% (GC-MS) w badanej frakcji i wyznaczono jego MIC, które wyniosło 10 000 mg/l.

EN

Ascosphaera apis is the fungal cause of the honey bee larvae disease chalkbrood. The influence of the extract from the leaves of the walnut (Juglans regia L) and obtained by the chromatographic separation fraction of the linear A. apis mycelium growth in vitro were tested. The antifungal activity of extract was weak (45%) but one obtained fraction showed 80% inhibition of fungal growth. The active components and relative contents in most active fraction were analyzed by GC-MS, DI-MS and IR. The juglone –active components present in an amount of 0.3% were tested. The minimum inhibitory concentration (MIC) test activity of juglone against A. apis was determined and was equal 2500 mg/l. In the active fraction dominated -tocopherol (58.6% by GC-MS). The activity -tocopherol against A. apis were tested, but we didn’t observed inhibit mycelium growth. The eugenol (4.6% by GC-MS) identified in active fractionalso were tested with MIC values in the order of 10 000 mg/l.

20

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

63%

Zukalova H. , Vasak J.

Rośliny Oleiste - Oilseed Crops

|

1998

|

tom 19

|

nr 1