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1

Thermal stability for the effective use of commercial catalase

Miłek J., Wójcik M., Verschelde W.

Polish Journal of Chemical Technology

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2014

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Vol. 16, nr 4

75--79

EN

Catalase with the commercial catalase name Terminox Ultra is widely used in the textile industry in bleaching processes. This enzyme is used to catalyse the decomposition of residual hydrogen peroxide into oxygen and water. In this study catalase was kept for about 30 hours in water baths in a temperature range from 35 to 70°C. For the first time, the kinetics of thermal deactivation of this enzyme was examined using an oxygen electrode. Stability of the enzyme depends strongly on temperature and its half-life times are 0.0014 h and 7.6 h, at 35 and 70°C, respectively.

2

Procedure to Calculate the Inductance of a Circular Loop Near a Metal Plate

Stevens N., Destrycker L., Verschelde W.

Przegląd Elektrotechniczny

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2011

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R. 87, nr 9a

255-258

EN

This paper describes the influence of metallic objects on the inductance as a function of the separation distance. We focus our attention on the benchmark configuration of a circular loop antenna near an infinite conducting plate. We consider the quasi-static approach, thus with a constant current distribution over the entire loop. The results are obtained by numerical integration and the accuracy of the numerical integration procedure is verified for a circular loop antenna in free space, for which a closed analytical solution exists. The results are particularly interesting in the domain of low frequency and high frequency Radio Frequency IDentification, where mutual influence of multiple reader antennas is often suppressed by means of a metallic shielding, which results in an important decrease of the readout distance and a detuning of every reader antenna.

PL

W artykule opisano wpływ obiektów metalowych na indukcyjność jako funkcję dystansu. Analizowano okrągłą antenę w pobliżu nieskończenie długiej metalowej płytki. Badania mają znaczenie w układach RFID gdzie liczne anteny są zakrywane przez metalowe ekrany.

3

Immobilization of Maxilact by cross-linked enzyme aggregates

Miłek J., Verschelde W.

Ars Separatoria Acta

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2012/2013

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No. 9/10

65--76

EN

Maxilact L2000 (β-galactosidase from Kluyveromyces lactis) was aggregated using ammonium sulphate and the resultant aggregates, on cross-linking with glutaraldehyde, produced an insoluble and catalytically active enzyme. These cross-linked enzyme aggregates (CLEAs) Maxilact were obtained in the optimal conditions. The activity of a biocatalyst, immobilized with the obtained preparation, was 5.89 U/mg. The operating stability of the immobilized Maxilact was determined for 10 successive batches. Residual activity was 8.24 U/mg after 10 cycles of batch operation. The above studies show that moderately stable preparation of catalase can be economically prepared by the cross-linked enzyme aggregates. The preparation and characterization of CLEAs Maxilact is reported for the first time.