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1

Exceptional molecular organization of canthaxanthin in lipid membranes

100%

Sujak A.

Acta Biochimica Polonica

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2012

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tom 59

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nr 1

Canthaxanthin (β,β-carotene 4,4' dione) used widely as a drug or as a food and cosmetic colorant may have some undesirable effects on human health, caused mainly by the formation of crystals in the macula lutea membranes of the retina of an eye. Experiments show the exceptional molecular organization of canthaxanthin and a strong effect of this pigment on the physical properties of lipid membranes. The most striking difference between canthaxanthin and other macular pigments is that the effects of canthaxanthin at a molecular level are observed at much lower concentration of this pigment with respect to lipid (as low as 0.05 mol%). An analysis of the molecular interactions of canthaxanthin showed molecular mechanisms such as: strong van der Waals interactions between the canthaxanthin molecule and the acyl chains of lipids, restrictions to the segmental molecular motion of lipid molecules, modifications of the surface of the lipid membranes, effect on the membrane thermotropic properties and finally interactions based on the formation of the hydrogen bonds. Such interactions can lead to a destabilization of the membrane and loss of membrane compactness. In the case of the retinal vasculature, it can lead to an increase in the permeability of the retinal capillary walls and the development of retinopathy.

2

Exceptional molecular organization of canthaxanthin in lipid membranes

100%

Sujak A.

Acta Biologica Cracoviensia. Series Botanica. Supplement

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2011

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tom 53

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nr 1

3

Prof. dr hab. Stanisław Pietruszewski

100%

Sujak A.

Inżynieria Przetwórstwa Spożywczego

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2015

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nr 1

4

Interactions between canthaxanthin and lipid membranes - possible mechanisms of canthaxanthin toxicity

100%

Sujak A.

Cellular and Molecular Biology Letters

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2009

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tom 14

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nr 3

395-410

Canthaxanthin (β, β-carotene 4, 4′ dione) is used widely as a drug or as a food and cosmetic colorant, but it may have some undesirable effects on human health, mainly caused by the formation of crystals in the macula lutea membranes of the retina. This condition is called canthaxanthin retinopathy. It has been shown that this type of dysfunction of the eye is strongly connected with damage to the blood vessels around the place of crystal deposition. This paper is a review of the experimental data supporting the hypothesis that the interactions of canthaxanthin with the lipid membranes and the aggregation of this pigment may be the factors enhancing canthaxanthin toxicity towards the macula vascular system. All the results of the experiments that have been done on model systems such as monolayers of pure canthaxanthin and mixtures of canthaxanthin and lipids, oriented bilayers or liposomes indicate a very strong effect of canthaxanthin on the physical properties of lipid membranes, which may explain its toxic action, which leads to the further development of canthaxanthin retinopathy.

5

Interaction between cadmium, zinc and silver-substituted plastocyanin and cytochrome b6f complex - heavy metals toxicity towards photosynthetic apparatus

100%

Sujak A.

Acta Physiologiae Plantarum

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2005

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tom 27

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nr 1

This paper reports the results of research on the interaction between the cytochrome f of the active cytochrome bf complex (incubated with Cd-, Zn-, and Ag-substituted plastocyanins) and Cu-plastocyanin. The presented studies show, that the metal derivatives of plastocyanin can have an influence on the photosynthetic electron transfer path: cytochrome b6fcomplex - photosystem I. The metal-substituted plastocyanins occupy the plastocyanin electron transfer site of the cytochromef The stopped-flow measurements show, that although the metal derivatives of plastocyanin do not influence the rate of cyt f - Pc electron transfer, creation of the non-electron-transfer complexes characterised by a strong binding between the cyt f and substituted plastocyanins and their slow release, dependent on the redox state of the substituted metal, results in the decrease of a turnover of the cytochrome complex.

6

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Evaluation of physical properties of selected vegetable oils obtained by cold pressing

63%

Kachel-Jakubowska M., Sujak A.

Acta Agrophysica

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2016

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tom 23

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nr 4

The aim of this work was to evaluate the physical properties of oils from winter rape, pumpkin and grape seeds in order to assess their potential as a source of functional oils. Seeds were analysed for water content, protein and fat. All the seeds met minimum requirements for technological quality. The effect of cold oil extraction on chemical compounds was studied in oils pressed from the above seeds. The properties of the oils were compared based on the lipid profiles, content of carotenoids, chlorophylls and tocopherols. The oxidation stability of the oils was estimated through the determination of the acid number, peroxide number and oxidation induction time.

7

Effect of storage period on physico chemical properties of rapeseeds and oil

63%

Sujak A., Kachel-Jakubowska M.

Polish Journal of Environmental Studies

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2012

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tom 21

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nr 3

The physicochemical parameters of rapeseeds stored under laboratory conditions for up to 3 years were measured by spectroscopic techniques. Humidity, crude fat, sulphur-containing species in seeds and levels of carotenoids and chlorophylls in oils were assigned. For most of the seeds the minimal technological quality requirements were met. Lipid oxidation products in oils were estimated by the levels of the end products of lipid peroxidation. Interestingly, the oxidation of the lipids was not higher in the oils pressed from older seeds. In conclusion, the material stored for a long period is a valuable product for further processing.

8

Effect of storing period on the quality of physical and chemical parameters of the industrial winter rape seeds

63%

Kachel-Jakubowska M., Sujak A.

Teka Komisji Motoryzacji i Energetyki Rolnictwa

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2011

|

tom 11

9

Laser light stimulation effects on Scorzonera hispanica L. seeds germination, field emergence and photosynthetic pigments content

51%

Dziewulska-Hunek A., Krawiec M., Sujak A.

Journal of Horticultural Research

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2016

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tom 24

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nr 1

10

Chemical composition and nutritive value of protein of the pea seeds-effect of harvesting year and variety

51%

Kotlarz A., Sujak A., Strobel W., Grzesiak W.

Vegetable Crops Research Bulletin

|

2011

|

tom 75

11

Eggshells of Grey Heron (Ardea cinerea) as a tool for bioindication of river valley

51%

Sujak A., Rymarz M., Kitowski I.

Current Topics in Biophysics. Supplement

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2013

|

tom 36

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nr 2A: Posters

12

Effect of fertilizer and storage period on oxidative stability and color of rapeseed oils

51%

Kachel-Jakubowska M., Sujak A., Krajewska M.

Polish Journal of Environmental Studies

|

2018

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tom 27

|

nr 2

We analysed physical and chemical properties of seeds and oils from different cultivars of winter rapeseeds (‘Markus’, ‘Bios’ and ‘Feliks’) that were cultivated using bio-gas natural manure (digestate) or with a commercially accessible Yara NPK 5014-28 (NPK) fertilizer, both of which were analyzed for element content. Seeds produced without use of fertilizers were taken as control. Prior to cold-pressing of oils, seeds were analyzed for fatty acid content. Cultivar ‘Bios’ breed with use of digestate showed a lower amount of oleic acid (C18:1), while the ‘Feliks’ cultivar had higher content of this fatty acid and lower amounts of linoleic acid (C18:2) as compared to respective controls. In the case of the application of NPK fertilizer, the increase in C18:1 was observed for the cultivars ‘Markus’ and ‘Feliks’. In the latter the decrease in the content of C18:2 was observed as compared to control. The oils were analyzed monthly for photosynthetic pigment content and oxidative stability as well as color during a storage period of three months. Oils contained similar amounts of chlorophylls and carotenoids. Oils derived from seeds produced with the use of commercial NPK fertilizer were characterized with higher oxidation stability (induction time) as compared to digestate. Gradual darkening of the oils was observed. Statistical analysis (p<0.05) showed significant correlation between all the color parameters and term of measurements as well as with the applied fertilizer.

13

Yield parameters of old and young lucerne plants upon pre-sowing electromagnetic seed stimulation

51%

Cwintal M., Dziwulska-Hunek A., Sujak A.

Acta Agrophysica

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2016

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tom 23

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nr 1

Lucerne is a fodder perennial plant from the Fabaceae family grown under field conditions as feed for various groups of animals. This paper is concerned with the effect of electromagnetic stimulation of lucerne seed on the yield, yield parameters, and content of photosynthetic pigments in 1-2- and 5-6- year old lucerne plants. In 2012-2013 a field experiment was conducted with 5-6-year old lucerne, which was initiated in 2008. Another experiment was started in 2012 and conducted on 1-2-year old lucerne. The research material were seeds of hybrid lucerne (Medicago x varia T. Martyn) variety Radius and sowing lucerne (Medicago sativa L.) variety Ulstar. Before sowing the seeds were stimulated with the following combinations of physical factors: C – control (untreated sample), L – laser light with a surface power density of 6 mW cm–2 during 3-fold free fall, F – alternating magnetic field with an induction of 30 mT and exposure time of 30 s; L + F – laser light and magnetic field in the above doses. Electromagnetic stimulation contributed significantly to an increase in the number of shoots per 1 m2 as compared to the control. No significant difference in the weight of a single shoot was observed between the experimental combinations. 5- 6-year old lucerne was characterised by a statistically greater shoot mass as compared with 1-2-year old plants. Statistical analysis showed that the highest yield increase was observed for the samples where seeds were stimulated with laser light and both laser light and magnetic field, relative to the control. The best results concerning concentrations of chlorophyll a and b and carotenoids were observed for alternating magnetic field, where the increase amounted to 9, 11 and 13.0%, respectively, as compared to the control.

14

Compositional and nutritional values of amaranth seeds after pre-sowing He-Ne laser light and alternating magnetic field treatment

51%

Sujak A., Dziwulska-Hunek A., Kornarzynski K.

International Agrophysics

|

2009

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tom 23

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nr 1

81-86

15

Short-term exposure to pre-sowing electromagnetic radiation of amaranth seeds affects germination energy but not photosynthetic pigment content

51%

Dziwulska-Hunek A., Sujak A., Kornarzynski K.

Polish Journal of Environmental Studies

|

2013

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tom 22

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nr 1

The effects of short-term (30 s) exposure of amaranth seeds to low frequency magnetic field (f=50 Hz, B=30 mT), laser light radiation (λ = 632.8 nm), or to their combination on germination, plant height, and the content of photosynthetic pigments were examined. The conducted experiment consisted of three independent parts: 1 – laboratory experiment where seed germination was carried out on Petri dishes 2 – pot experiment 3 – field experiment Pre-sowing radiation of the amaranth seeds with a single physical factor resulted in the statistically significant increase of the germination energy as compared to control. Radiation of the seeds with the combination of laser light and magnetic field induced opposite response in the case of laboratory and pot tests: significant increase of the germination energy was observed for laboratory tests while a decrease of this parameter was observed for the pot test. Pre-sowing radiation treatments did not influence germination capacity, which indicated that only early stages of the germination process were affected. Although no statistical differences were found, the results indicate that pre-sowing radiation of the seeds with a single factor resulted in an increase in the number of plants per 1m2 in field experiment. Contents of carotenoids and chlorophylls were not affected by electromagnetic radiation. The experiments indicated a stable chlorophyll a to chlorophyll b ratio of c.a. 3.5. An attempt to explain on the molecular level the influence of electromagnetic radiation on germination and content of photosynthetic pigments in amaranth was made.

16

Changes to the composition of colorants caused by the temperature of drying rapeseed

51%

Tys J., Sujak A., Bogdan A.

International Agrophysics

|

2002

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tom 16

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nr 4

307-312

17

Laser irradiation effects on scorzonera (Scorzonera hispanica L.) seed germination and seedling emergence

51%

Krawiec M., Dziwulska-Hunek A., Sujak A., Palonka S.

Acta Scientiarum Polonorum. Hortorum Cultus

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2015

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tom 14

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nr 2

Laser stimulation is a non-expensive and environmentally safe way of the improving of seeds quality. The objective of the study was to determine the effect of He-Ne laser irradiation on the germination parameters of scorzonera seeds. Seeds were characterized with different quality expressed by germination capacity. Experimental material consisted of 4 lots of scorzonera seeds having initial germination capacity between 50.8 and 93.0%. Seeds were treated with laser He-Ne light of surface power density of 3 mW·cm-2 and the time of exposition of 0 (control), 1, 5, 10 and 30 minutes. After pre-sowing stimulation of seeds the following parameters were estimated: germination energy, germination capacity, mean germination time, speed of germination, hypocotyl length, length of radicle, fresh and dry weight of seedling, field emergence, mean emergence time and speed of emergence. Pre-sowing laser treatment resulted in increasing of the several parameters such as germination energy, germination capacity, speed of germination, hypocotyl and radicle length, as well as fresh and dry weight of seedlings. Laser light stimulation was the most effective in the case of low quality seeds (initial germination capacity of 50.8%). Irradiation of the seeds belonging to this group also resulted in the increase of the seedling emergence and the speed of emergence.

18

Quality of rapeseed bio-fuel waste: optical properties

51%

Sujak A., Muszynski S., Kachel-Jakubowska M.

International Agrophysics

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2014

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tom 28

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nr 2

The objective of the presented work was to examine the optical properties of selected bio-fuel waste. Three independent optical methods: UV-Vis spectroscopy, infrared spectroscopy and chromametric measurements were applied to establish the possible quality control test for the obtained substances. The following by-products were tested: distilled glycerine, technical glycerine and matter organic non glycerine fraction from rapeseed oil bio-fuel production. The results show that analysis of UV-Vis spectra can give rapid information about the purity of distilled glycerine, while no direct information can be obtained concerning the concentration and kind of impurities. Transmission mode is more useful as compared to absorption, concerning the detection abilities of average UV-Vis spectrometers. Infrared spectroscopy can be used as a complementary method for determining impurities/admixtures in samples. Measurements of chroma give the quickest data to compare the colour of biofuel by-products obtained by different producers. The condition is, however, that the products are received through the same or similar chemical processes. The other important factor is application of well defined measuring background. All the discussed analyses are quick, cheap and non-destructive, and can help to compare the quality of products.

19

Effect of pre-sowing laser treatment of seed on the biomass yield and energy value of Lavatera thuringiaca L. plant

51%

Budzen M., Sujak A., Wiacek D.

Teka Komisji Motoryzacji i Energetyki Rolnictwa

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2016

|

tom 16

|

nr 4

20

Effect of composition and processing conditions on selected properties of potato-based pellets and microwave-expanded Snacks supplemented with fresh beetroot pulp

51%

Lisiecka K., Wojtowicz A., Sujak A.

Polish Journal of Food and Nutrition Sciences

|

2021

|

tom 71

|

nr 2

Ograniczanie wyników

Exceptional molecular organization of canthaxanthin in lipid membranes

Exceptional molecular organization of canthaxanthin in lipid membranes

Prof. dr hab. Stanisław Pietruszewski

Interactions between canthaxanthin and lipid membranes - possible mechanisms of canthaxanthin toxicity

Interaction between cadmium, zinc and silver-substituted plastocyanin and cytochrome b6f complex - heavy metals toxicity towards photosynthetic apparatus

Evaluation of physical properties of selected vegetable oils obtained by cold pressing

Effect of storage period on physico chemical properties of rapeseeds and oil

Effect of storing period on the quality of physical and chemical parameters of the industrial winter rape seeds

Laser light stimulation effects on Scorzonera hispanica L. seeds germination, field emergence and photosynthetic pigments content

Chemical composition and nutritive value of protein of the pea seeds-effect of harvesting year and variety

Eggshells of Grey Heron (Ardea cinerea) as a tool for bioindication of river valley

Effect of fertilizer and storage period on oxidative stability and color of rapeseed oils

Yield parameters of old and young lucerne plants upon pre-sowing electromagnetic seed stimulation

Compositional and nutritional values of amaranth seeds after pre-sowing He-Ne laser light and alternating magnetic field treatment

Short-term exposure to pre-sowing electromagnetic radiation of amaranth seeds affects germination energy but not photosynthetic pigment content

Changes to the composition of colorants caused by the temperature of drying rapeseed

Laser irradiation effects on scorzonera (Scorzonera hispanica L.) seed germination and seedling emergence

Quality of rapeseed bio-fuel waste: optical properties

Effect of pre-sowing laser treatment of seed on the biomass yield and energy value of Lavatera thuringiaca L. plant

Effect of composition and processing conditions on selected properties of potato-based pellets and microwave-expanded Snacks supplemented with fresh beetroot pulp