Results found: 3

Number of results on page

Search results

Sort By:

Limit search:

Immobilization ofAmano Lipase Aonto Stöber silica surface: process characterization and kinetic studies

100%

Zdarta J., Sałek K., Kołodziejczak-Radzimska A., Siwińska-Stefańska K., Szwarc-Rzepka K., Norman M., Klapiszewski Ł., Bartczak P., Kaczorek E., Jesionowski T.

Open Chemistry

2015

vol. 13

issue 1

The immobilization of Amano Lipase A from Aspergillus niger by adsorption onto Stöber silica matrix obtained by sol-gel method was studied. The effectiveness of the enzyme immobilization and thus the usefulness of the method was demonstrated by a number of physicochemical analysis techniques including Fourier Transform Infrared Spectroscopy (FT-IR), elemental analysis (EA), thermogravimetric analysis (TG), porous structure of the support and the products after immobilization from the enzyme solution with various concentration at different times. The analysis of the process’ kinetics allowed the determination of the sorption parameters of the support and optimization of the process. The optimum initial concentration of the enzyme solution was found to be 5 mg mL-1, while the optimum time of the immobilization was 120 minutes. These values of the variable parameters of the process were obtained by as ensuring the immobilization of the largest possible amount of the biocatalyst at

Functional polypropylene composites filled with ultra-fine magnesium hydroxide

100%

Pilarska A., Bula K., Myszka K., Rozmanowski T., Szwarc-Rzepka K., Pilarski K., Chrzanowski Ł., Czaczyk K., Jesionowski T.

Open Chemistry

2015

vol. 13

issue 1

Magnesium hydroxide was prepared under controlled conditions from aqueous Mg(NO3)2 and NaOH solutions. The small, nanoplate-shaped particle size distribution was monomodal from 164 to 459 nm. Functional polypropylene/Mg(OH)2 and polypropylene/polypropylene 1% maleic anhydride/Mg(OH)2 composites were prepared containing 10% or 30% Mg(OH)2. The composites have a high Young’s modulus (twice that of polypropylene) and comparable tensile strength but less ductility. EDX examination of the fractured composite surfaces suggested a homogeneous Mg(OH)2 distribution for composites produced with the addition of polypropylene grafted with maleic anhydride. The polypropylene/Mg(OH)2 composites showed good antibacterial activity. The polypropylene/polypropylene 1% maleic anhydride/Mg(OH)2 composites were less effective.

Silica/lignosulfonate hybrid materials: Preparation and characterization

100%

Klapiszewski Ł., Zdarta J., Szatkowski T., Wysokowski M., Nowacka M., Szwarc-Rzepka K., Bartczak P., Siwińska-Stefańska K., Ehrlich H., Jesionowski T.

Open Chemistry

2014

vol. 12

issue 6

719-735

The research reported here concerns the synthesis, characterization and potential applications of silica/lignosulfonate hybrid materials. Three types of silica were used (Aerosil®200, Syloid®244 and hydrated silica), along with magnesium lignosulfonate. The effectiveness of the hybrid material synthesis methodology was confirmed indirectly, using Fourier transform infrared spectroscopy, elemental and colorimetric analysis. Dispersive-morphological analysis indicates that the products with the best properties were obtained using 10 parts by weight of magnesium lignosulfonate per 100 parts of Syloid®244 silica. The relatively high thermal stability recorded for the majority of the synthesized products indicates the potential use of this kind of a material as a polymer filler. Results indicating the high electrokinetic stability of the materials are also of great importance. Additionally, the very good porous structure properties indicate the potential use of silica/lignosulfonate systems as biosorbents of hazardous metal ions and harmful organic compounds.

Refine search results

3 Open Chemistry

3 2014

3 Jesionowski T.

3 Szwarc-Rzepka K.

2 Bartczak P.

2 Klapiszewski Ł.

2 Siwińska-Stefańska K.

2 Zdarta J.

1 Bula K.

1 Chrzanowski Ł.

1 Czaczyk K.

1 Ehrlich H.

1 Kaczorek E.

1 Kołodziejczak-Radzimska A.

1 Myszka K.

1 Norman M.

1 Nowacka M.

1 Pilarska A.

1 Pilarski K.

1 Rozmanowski T.

1 Sałek K.

1 Szatkowski T.

1 Wysokowski M.

Search results

Immobilization ofAmano Lipase Aonto Stöber silica surface: process characterization and kinetic studies

Functional polypropylene composites filled with ultra-fine magnesium hydroxide

Silica/lignosulfonate hybrid materials: Preparation and characterization