Wyniki wyszukiwania - Biblioteka Nauki

1

Amano Lipase A grafting onto a silica surface

100%

Zdarta J. , Jesionowski T.

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nr 1

2

Activated lignin and aminosilane-grafted silica as precursors in hybrid material production

80%

Klapiszewski L. , Szalaty T. J. , Zdarta J. , Jesionowski T.

Physicochemical Problems of Mineral Processing

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2016

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tom Vol. 52, iss. 1

459--478

EN

Functional inorganic-organic hybrids were synthesized using as a precursor silica with the addition of an appropriate amount of lignin as components. Three types of silica were applied as the support: the commercial silicas Syloid 244 and Aerosil 200, and hydrated silica precipitated in a polar system. The silicon dioxide was initially functionalized with aminosilane to activate the surface, and then the silica-based material was combined with lignin oxidized using hydrogen peroxide. The obtained inorganic-organic hybrids underwent physicochemical and dispersive-morphological analysis, with comparison of the results depending on the composition of the test samples. In addition, particle size distributions were determined and the surface structure of the products assessed by scanning electron microscopy. The presence of functional groups was also determined by FTIR spectroscopy. The thermal analysis of the silica/lignin materials was also performed, as well as the elemental and colorimetric analyses, which indirectly confirmed the correctness of the synthesis process. Hybrid materials with the most favorable dispersive and morphological properties were obtained by adding a small amount of biopolymer. The thermogravimetric analysis of the SiO2/lignin hybrids indicated their good thermal stability. With increasing quantity of lignin per 100 parts by weight of silica matrix, progressive deterioration in the thermal stability of the materials was observed.

3

Nowatorskie układy immobilizowanej laktazy jako efektywne systemy do biodegradacji bisfenoli

70%

Antecka K. , Zdarta J. , Zgola-Grzeskowiak A. , Erhlich H. , Jesionowski T.

Postępy Mikrobiologii. Suplement

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2017

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tom 56

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nr 2

4

Hydroxyapatite as a support in protease immobilization process

51%

Zdarta J. , Budzinska K. , Kolodziejczak-Radzimska A. , Klapiszewski Ł. , Siwinska-Stefanska K. , Bartczak P. , Piasecki A. , Maciejewski H. , Jesionowski T.

Physicochemical Problems of Mineral Processing

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2015

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tom Vol. 51, iss. 2

633--646

EN

Hydroxyapatite is used as a matrix for immobilization of protease from Aspergillus oryzae by a process of adsorption. The matrix obtained has the surface area of 26 m2/g and particles in the shape of flakes of diameters no greater than 650 nm. The efficiency of the proposed method was confirmed by the Fourier transform infrared spectroscopy, elemental analysis and by analysis of parameters of the pore structure of matrix and products after immobilization. On the basis of the Bradford method it was found that the greatest amount of enzyme (132 mg/g) was immobilized from a solution of initial enzyme concentration of 7 mg/cm3 after 24 h of the process.

5

Synthesis and characterization of hydroxyapatite/chitosan composites

51%

Szatkowski T. , Kołodziejczak-Radzimska A. , Zdarta J. , Szwarc-Rzepka K. , Paukszta D. , Wysokowski M. , Ehrlich H. , Jesionowski T.

Physicochemical Problems of Mineral Processing

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2015

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tom Vol. 51, iss. 2

575--585

EN

Hydroxyapatite (HAp)/chitosan (CS) composites were synthesized via a one-step co-precipitation method from aqueous solution, with the use of calcium chloride (CaCl2) and disodium hydrogen phosphate (Na2HPO4). CS was obtained via partial deacetylation of chitin with the use of strong sodium hydroxide solution. Composites were prepared with various HAp/CS ratios (30/70, 50/50, 70/30, 85/15) for comprehensive comparison of their properties. Fourier Transform Infrared Spectroscopy (FT-IR) analysis showed that hydrogen bonds were formed between the organic matrix and the mineral compound, confirming a successful phase interconnection. X-ray diffraction patterns were obtained, enabling examination of the crystalline properties of the composites, including HAp identification. The porous structure parameters of the composites were investigated, and morphological analysis (SEM) was performed. Differential Thermal Gravimetry (DTG) analysis of the composites indicated that the material is thermally stable up to 200 oC. Additionally, Energy Dispersive Spectroscopy (EDS) analysis of the mineral was carried out to check the Ca/P ratio, and confirmed its similarity to pure HAp.

6

Zaawansowane funkcjonalne materiały wytwarzane z użyciem substancji pochodzenia naturalnego

51%

Jesionowski T. , Jankowska K. , Jędrzak A. , Szalaty T. J. , Żółtowska-Aksamitowska S. , Klapiszewski Ł. , Kołodziejczak-Radzimska A. , Stasiewicz M. , Wysokowski M. , Zdarta J.

Przemysł Chemiczny

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2018

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tom T. 97, nr 12

2026--2036

PL

Opisano aktualny stan wiedzy i prace, jakie są prowadzone w Zakładzie Technologii Chemicznej Politechniki Poznańskiej, poświęcone wytwarzaniu zaawansowanych materiałów z udziałem substancji pochodzenia naturalnego, takich jak lignina, chityna i szkielety gąbek morskich. Wskazano kierunki wykorzystania tych unikatowych materiałów.

EN

A review, with 107 refs., of selected bio-based materials (lignin, chitin, skeletons of marine sponges), their properties as well as possibilities for their practical use.