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1
Content available Aktywność biologiczna związków acetylenowych pochodzenia naturalnego
Kadela-Tomanek M., Chrobak E., Bębenek E., Lubczyńska A., Siudak S., Wójcik A., Otulakowska A.
Wiadomości Chemiczne
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2016
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[Z] 70, 9-10
613--632
EN
The natural acetylenic products containing at least one a carbon-carbon triple bond, are important class of compounds widely distributed in the environment. Development of spectroscopic techniques and methods for the isolation of metabolites allowed the extraction of natural acetylenic compounds. The most of these substances have been obtained from marine organisms, such as: cyanobacteria, algae and sponges. The next source of metabolites are herbal plants, which were used in the Chinese traditional medicine. A many of them show interesting biological activity. The first isolated natural compound possessing an acetylenic unit was dehydromatricaria ester, which was obtained from rhizome European goldenrod (Solidago virgaurea). To present day have been found and researched more than 2000 natural acetylenic metabolites. Due to the chemical structure, natural acetylenic compounds were divided into six groups: peptides, aromatic compounds, enediyne antibiotics, sterols, carotenoids, and poliacetylenic compounds . This article focuses natural acetylenic substances, which exhibit interesting biological properties, particularly anticancer ones. The review presents many of such metabolites, including fatty alcohols, ketones, acids, ethers, and carotenoids.
2
Content available Kultowe bestie : literatura a nauka
Wilk A. N., Kafarski P.
Wiadomości Chemiczne
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2014
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[Z] 68, 1-2
1--20
EN
Vampire, werewolf or zombie are individuals more and more often met in horrors. Since their existence seems to break down all rules of science literature experts consider them exclusively as metaphor of human anxiety towards unknown and incomprehensible and unexplored issues. Such a definition of these monsters is well acknowledged in literature and cinematography. However, this seems not to be fully true because there exist some rationales and some proofs that these mystic characters might be seen in reality.
3
Content available Chemiczne markery miodów odmianowych
Jasicka-Misiak I., Kafarski P.
Wiadomości Chemiczne
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2011
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[Z] 65, 9-10
822-837
EN
Honey is a natural food product reach in variety of chemical compounds, which are responsible for its quality and aroma. Unifloral honeys are especially attractive for buyers and are quite frequently falsified. Thus, the assessment of their quality is indispensable. Today it relays on identification of the pollen and determination of honey physicochemical properties. In this paper the new methods for the assessment of honey quality are described. They relay on analysis and identification of volatile compounds typical for certain uniflolar honeys. These compounds are called markers. These could virtually all natural products with products of decomposition of phenylalanine, terpenes, flavonoids, aromatic acids, heterocycles, caretonoids and non-typical sugars. The second approach is to study metabolome of these honeys. The most effective metabolomic studies relay on building up “finger-prints” of certain honey branch basing on relative concentrations of chosen set of volatile compounds.
4
Content available remote Catalytic spectrophotometric determination of vanadium and its application to some natural and agricultural products
Feng Q.-L., Wen D.-Y.
Chemia Analityczna
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2006
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Vol. 51, No. 2
319-325
EN
A simple and highly sensitive spectrophotometric method for the determination ofvana-dium(V) has been proposed. The method is based on catalytic oxidation of 1,8-dihydroxy-naphthalene-3,6-disiulfonic acid and phenylhydra/.inc with potassium chlorate. The molar absorptivity was 7.8 x 106 at the wavelength of 506 nm, detection range was 0.2-5.0 ng mL-1. The new method is simple and provides high sensitivity and good selectivity. It has been successfully applied to the determination of trace amounts of vanadium in spring water, black bean, corn, tea leaves, and Rhodiola schalinensis A leaves.
PL
Opracowano prostą i czułą spektofotometryczną metodę oznaczania wanadu( V). Metoda polega na katalitycznym utlenianiu kwasu l,8-dihydroksynaftaleno-3,6-disuIfonowego i fenylohydrazyny za pomocą chloranu potasowego. Molowy współczynnik absorpcji przy długości fali 506 nm wynosił 7 x 106, a zakres stężeń w którym prowadzono pomiary 0.2—5,0 ng mL-1. Nowa metoda jest prosta, selektywna i bardzo czulą. Zastosowano ją z powodzeniem do oznaczania śladowych ilości wanadu w wodzie źródlanej, czarnej fasoli, kukurydzy, herbacie i liściach Rhodiola schalinensis A.
5
Content available remote Ekstrakcja produktów naturalnych gazami w stanie nadkrytycznym
Wolski T., Ludwiczuk A.
Przemysł Chemiczny
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2001
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T. 80, nr 7
286-289
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