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Chemical characterization and biochemical activity of polysaccharides isolated from Egyptian Ulva fasciata Delile

Moawad Madelyn N., El-Sayed Abeer A.M., Abd El Latif Hala H., El-Naggar Naglaa A., El-Din Nihal G. Shams, Tadros Hermine R.Z.

Oceanologia

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2022

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No. 64 (1)

117--130

EN

This study gives updated information on the isolation of ulvan from green alga Ulva fasciata Delile in Egypt through isolation and chemical characterization of sulfate polysaccharides by two sequential extraction steps using different solvents; distilled water, HCl and Na2EDTA forming fraction I (F-I). Fraction II (F-II) was obtained from remaining seaweeds using NaOH to give FDWNaOH, FHClNaOH, and FEDTANaOH. All products obtained were tested for their biological activities. The highest polysaccharides total extraction yield was 11.8% for water extract (F-I and F-II). The highest protein content was found in FEDTANaOH (2.44%). The highest sulfate content was recorded for F-I (HCl) (21.38%). Total carbohydrates range was 11.99–63.90% for F-I and 15.06–76.65% for F-II. Monosaccharides; galactose, rhamnose, and uronic acid were detected at all fractions, with concentrations varying from 0.11 to 1.34%, from 0.61 to 1.81% and from 11.06 to 19.30%, respectively. 1H NMR of F-II demonstrated the signals of ring and methyl protons of polysaccharide. The appearance of the stretching bands of the sulfate ester (C-O-S) and sulfate groups (S=O) in the FT-IR spectrum of FHClNaOH confirmed the presence of sulfated polysaccharides, typical of ulvan. The microbial species Vibrio damsela was the most susceptible to FDWNaOH, followed by Aeromonas hydrophila and Vibrio fluvialis with inhibition zones of 30, 22, 22 mm at 150 mg/ml, respectively. FDWNaOH was the most effective fraction having antifouling property. The highest antioxidant activity was observed for F-IHCl followed by FDWNaOH. At concentrations 25 and 50 mg/l, FEDTANaOH displayed the highest anti-inflammatory activity (94.0 and 91.40%, respectively).

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Herbicydowe ciecze jonowe

Praczyk T., Pernak J.

Przemysł Chemiczny

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2013

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T. 92, nr 9

1660-1662

PL

Opisano sposób syntezy, wybrane właściwości fizykochemiczne oraz biologiczną aktywność herbicydowych cieczy jonowych z anionem 4-chloro-2-metylofenoksyoctanowym i 2,4-dichlorofenoksyoctanowym oraz dwufunkcyjne herbicydowe ciecze jonowe z kationem, którego źródłem był chlorek (2-chloroetylo)trimetyloamoniowy (CCC). Nowe herbicydowe ciecze jonowe wykazały lepszą skuteczność działania na chwasty niż obecnie stosowane herbicydy.

EN

A review, with 5 refs., of author's own papers on synthesis and agricultural use of mono and bifunctional ionic liqs. In particular, 2 new ionic liqs. with (4-chloro-2-methylphenoxy)acetate and (2,4-dichlorophenoxy)acetate anions and a new ionic liq. with chloride-2-chloroethyltrimethylammonium cation and herbicidal anion were taken into consideration and their properties were described.

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Biological activity of soil contaminated by biodiesel

Hawrot-Paw M., Kamieniecka A., Smolik B.

Environment Protection Engineering

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2010

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Vol. 36, nr 3

87-93

EN

The aim of the research was to evaluate the influence of biodiesel on the microorganisms biomass and dehydrogenase activity. Biodiesel was introduced into the soil at a concentration of 1.5 and 10%. The influence of biofuel on the amount of biomass of living microorganisms was various and depended on the dose which was used. Stimulation of dehydrogenases activity was observed in 1% dose of biodiesel (about 60-300% higher than the values in non-contaminated soil). Higher doses, within a longer period of time, had a negative influence on microorganisms (reduction of their activity up to 35-92% compared to the control).