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1

The occurrence of long-chain polyprenols in leaves of plants of Combretaceae family

100%
Kulcitsky V., Hertel J., Skoczylas E., Swiezewska E., Chojnacki T.
Acta Biochimica Polonica
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1996
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tom 43
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nr 4
The presence of poly-ci's-prenols of chain length 20-60 isoprene units or longer in leaves of plants belonging to Combretaceae family was shown to be a common feature in this group of plants. The polyprenols of this type were found in half of the 20 species studied. In most cases the polyprenols occurred in the form of fatty acid esters. Only in one species — Combretum molle, the polyprenols were found in the form of free alcohols. The amount of long-chain polyprenols varied with the plant species; the richest source was C. molle (about 4% of dry mass of leaves). Polyprenol groups characteristic of other systematic families of plants were not found in the Combre­taceae studied
2
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Plant long-chain polyprenols as chemotaxonomic markers

100%
Roslinska M., Walinska K., Swiezewska E., Chojnacki T.
Dendrobiology
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2002
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tom 47
The occurrence of long-chain polyprenols in leaves of plants of Lauraceae, Tiliaceae and Magnoliaceae families was studied. Separation of groups of polyprenols differing in the size of molecules was performed by thin-layer chromatography. In all studied species long-chain polyprenols were detected. The total polyprenol content in leaves reached values as high as 3% of their dry weight. In the studied species belonging to Lauraceae family a fraction of polyprenols composed of 10-14 isoprene units was present. In species of Tiliaceae and Magnoliaceae polyprenols composed of 9-12 and 10-12 isoprene units were present, respectively. Differences in polyprenol profile characteristic for each family studied were observed. These results were confirmed by HPLC. The structure of these polyprenols was examined by NMR spectrometry and in representative species studied polyprenols exibited the typical poly-cis structure. The effect of insolation on the rate of accumulation of polyprenols was documented.
3

Properties of lipid bilayers modified by long-chain polyprenols

100%
Walinska K., Janas T., Chojnacki T., Swiezewska E., Janas T.
Cellular and Molecular Biology Letters
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1997
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tom 02
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nr 1
4

The occurrence of unique, long-chain polyprenols in the leaves of Potentilla species

84%
Swiezewska E., Chojnacki T.
Acta Biochimica Polonica
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1989
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tom 36
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nr 2
5

Plant long-chain polyprenols as chemotaxonomic markers

84%
Roslinska M., Walinska K., Swiezewska E., Chojnacki T.
Cellular and Molecular Biology Letters
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2001
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tom 06
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nr 2
6

Search for polyprenols in leaves of evergreen and deciduous Ericaceae plants

84%
Ranjan R., Marczewski A., Chojnacki T., Hertel J., Swiezewska E.
Acta Biochimica Polonica
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2001
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tom 48
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nr 2
Var i ous spe cies and cultivars of Ericaceae fam ily were checked for the pres ence of long-chain polyprenols in their leaves. In the ge nus Rhododendron no polyprenols were found in the ever-green spe cies, while they were pres ent in the de cid u ous type. The polyprenols were of chain-length of 14-20 isoprene res i dues and they oc curred in the form of acetic acid esters. The polyprenol accu mu la tion is dis cussed with re­spect to se nes cence of leaves.
7

Polyprenols in leaves of fruit-trees of Rosaceae family

84%
Swiezewska E., Chojnacki T.
Acta Biochimica Polonica
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1996
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tom 43
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nr 4
In leaves of various species of fruit-trees belonging to the Rosaceae family, large amounts of polyprenyl acetates (0.5-5.0% of dry weight) were found. Discrete constant differences of polyprenol spectrum characteristic of each genus studied: Mains, Pruttus and Pyrus were observed. In each species poly-ris-prenols composed of 19 and 20 isoprene units were predominating. In one of the 23 studied species (Prunus incisa) a fraction of long-chain polyprenols composed of 35—45 isoprene units was also present. It seems that this type of unusually long-chain polyprenols could occur also in other plants of the Rosaceae family
8

The effect of hexadecaprenol on molecular organisation and transport properties of model membranes

67%
Janas T., Nowotarski K., Gruszecki W. I., Janas T.
Acta Biochimica Polonica
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2000
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tom 47
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nr 3
The Langmuir monolayer technique and voltammetric analysis were used to investigate the properties of model lipid membranes prepared from dioleoylphosphatidylcholine (DOPC), hexadecaprenol (C80), and their mixtures. Surface pressure- molecular area isotherms, current-voltage characteristics, and membrane conductance-temperature were measured. Molecular area isobars, specific molecular areas, excess free energy of mixing, collapse pressure and collapse area were determined for lipid monolayers. Membrane conductance, activation energy of ion migration across the membrane, and membrane permeability coefficient for chloride ions were determined for lipid bilayers. Hexadecaprenol decreases the activation energy and increases membrane conductance and membrane permeability coefficient. The results of monolayer and bilayer investigations show that some electrical, transport and packing properties of lipid membranes change under the influence of hexadecaprenol. The results indicate that hexadecaprenol modulates the molecular organisation of the membrane and that the specific molecular area of polyprenol molecules depends on the relative concentration of polyprenols in membranes. We suggest that hexadecaprenol modifies lipid membranes by the formation of fluid microdomains. The results also indicate that electrical transmembrane potential can accelerate the formation of pores in lipid bilayers modified by long chain polyprenols.
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