Purification of fungal polysaccharides using chromatographic methods

Celem pracy było opracowanie metody pozyskiwania i oczyszczania zewnątrzkomórkowych polisacharydów ze szczepu Ganoderma applanatum z wykorzystaniem metod chromatograficznych. Surowy preparat polisacharydu poddawano analizie chromatograficznej z wykorzystaniem nośników Sepharose 6B lub Sepharose CI-4B uzyskując trzy symetryczne piki elucji. Frakcje polisacharydowe nie wykazywały absorbancji przy długości fali 280 i 260 nm co świadczy o braku białek i kwasów nukleinowych w badanych substancjach.The aim of this work was to study the production of exopolysaccharides from Ganoderma applanatum and the description of chromatographic methoc purification of fungal polysaccharides. Crude polysaccharides were fractionated using preparative Sepharose 6B or Sepharose CI-4B chromatography obtain three fractions, which were selected on the total carbohydrate elution profile. Polysaccharides fractions had no absorbance at 280 and 260 nm UV spectrum, indicating the absence of proteins and nucleic acids

Effect of different wavelengths of light on laccase, cellobiose dehydrogenase, and proteases produced by Cerrena unicolor, Pycnoporus sanguineus and Phlebia lindtneri

Three species of white rot fungi: Cerrena unicolor, Phlebia lindtneri and Pycnoporus sanguineus were cultured in two different media under five different lighting conditions: dark, white, red, blue, and green light. Laccase, cellobiose dehydrogenase, and protease activities were examined in the samples. Blue light efficiently boosted laccase synthesis in C. unicolor and P. sanguineus, whereas the highest activities (20 654 nkat/l) of P. lindtneri laccase were observed when this fungus was maintained in green light. On the contrary, the green light allowed obtaining the highest activities of cellobiose dehydrogenase of C. unicolor and P. lindtneri, while CDH of P. sanguineus seems to be dependent on white light. It is clearly visible that differences in protease activities are noticeable not only between the lights variants but also among the media used. However, high proteases activities are correlated with light variants inducing laccase in Lindeberg and Holm medium. Contrary to the cellulose-based medium, where they are weak in light variants that lead to high CDH activities

The Influence of Biochemical Modification on the Properties of Adhesive Compounds

The main objective of this study was to determine the effect of biochemical modification of epoxy adhesive compounds on the mechanical properties of a cured adhesive exposed to various climatic factors. The epoxy adhesive was modified by lyophilized fungal metabolites and prepared by three methods. Additionally, the adhesive compound specimens were seasoned for two months at a temperature of 50 °C and 50% humidity in a climate test chamber, Espec SH 661. The tensile strength tests of the adhesive compounds were performed using a Zwick/Roell Z150 testing machine in compliance with the DIN EN ISO 527-1 standard. The examination of the adhesive specimens was performed using two microscopes: a LEO 912AB transmission electron microscope equipped with Quantax 200 for EDS X-ray spectroscopy and a Zeiss 510 META confocal microscope coupled to an AxioVert 200M. The experiments involved the use of a CT Skyscan 1172 tomograph. The results revealed that some mechanical properties of the modified adhesives were significantly affected by both the method of preparation of the adhesive compound and the content of the modifying agent. In addition, it was found that seasoning of the modified adhesives does not lead to a decrease in some of their mechanical properties

Analysis of the efficiency and specificity of the synthetic serine protease inhibitor immobilization process using capillary electrophoresis

Przedstawiono proces immobilizacji syntetycznego inhibitora proteaz serynowych AEBSF, który należy do rodziny związków benzosulfonowych. Zastosowanie techniki elektroforezy kapilarnej do celów analizy ilościowej pozwoliło na przeprowadzenie szybkiego pomiaru, charakteryzującego się wysoką specyficznością i precyzją. Na podstawie uzyskanych wyników stwierdzono, że inhibitor AEBSF, poddawany procesowi kowalencyjnej immobilizacji, jest efektywnie wiązany do porowatego nośnika. Jednocześnie określono, że wiąże się on z matrycą także wiązaniami adsorpcyjnymi i hydrofobowymi.The paper describes a method of immobilization of AEBSF synthetic protease inhibitor which belongs to the family of benzensulfonyl compounds. The application of capillary electrophoresis for a quantitative analysis allows one to perform high-speed measurement characterized by high specificity and repeatability. The obtained results allowed one to confirm that the AEBSF inhibitor under covalent immobilization process is effectively bound to the porous support. It was also determined that AEBSF inhibitor binds to the matrix by adsorption and hydrophobic bonds