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Polypropylene composite nonwovens with increased degradation capability for filtration applications

Sójka-Ledakowicz J., Kałużka J., Łatwińska M., Klepacz-Smółka A., Ślęzak R.

Polish Journal of Applied Chemistry

2011

Vol. 55, nr 1

33-40

Composite polypropylene nonwovens were produced according to melt-blown technique with the addition (2 wt. %) of microcrystalline cellulose and with the addition (3 wt. %) of microbiological chitosan from filamentous fungi Absidia orchidis. Earlier research works indicated that these composite nonwovens were characterized by higher photo-degradation degree than untreated polypropylene nonwovens; especially great effect of microbiological chitosan was observed. Composite polypropylene nonwovens with cellulose and chitosan addition were analysed with reference to bio-destruction rate and filtration parameters (in multi-layer systems). Test results indicate that both modifiers improve bio-destruction degree of polypropylene nonwovens. The composite nonwoven with chitosan addition is characterized by better filtration parameters than the nonwoven with cellulose addition, hence it could be applied as a layer in multi-layer systems for air purification in high class clcan-rooms.

Direct indicators of determination of glyphosate decomposition by filamentous fungi

Sudoł T., Krzyśko-Łupicka T.

Physicochemical Problems of Mineral Processing

2005

Vol. 39

257-261

Herbicides containing glyphosate undergo decomposition mainly by microorganisms. Monitoring this process requires an application of simple, quick and cheap instrumental methods. Thin layer chromatography was used in the present work to determine organic compounds in fermentation broth and absorption UV-Vis spectroscopy to determine orthophosphate ions (Pi). The obtained chromatograms of fermentation broth showed glyphosate biodegradation, but not with the use of commonly known route with the formation of glycin, aminomethylphosphonic acid (AMPA) and orthophosphate ions (Pi). This fact was confirmed by spectroscopic studies used for the parallel determination of concentrations of inorganic phosphorus (Pi), the levels of which were very low.