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Proszki TiO2 z grupami aminowymi: synteza, charakterystyka oraz badanie porowatości

Iwan A., Hreniak A., Malinowski M., Gryzło K.

Materiały Ceramiczne

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2014

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T. 66, nr 2

141--145

PL

W celu otrzymania proszków TiO2 modyfikowanych grupami aminowymi przeprowadzono syntezy, wprowadzając na etapie hydrolizy w różnej ilości prekursor TEAIP: Ti(C2H4O)3N(OCH(CH3)2). Otrzymano dwa proszki różniące się zawartością grup aminowych (TiO2-13 i TiO2-14). Dla otrzymanych proszków wykonano badania absorpcyjne w zakresie UV-Vis, badania porowatości oraz powierzchni właściwej. Dodatkowo dla proszków TiO2 określono wielkość ziaren i wykonano pomiar potencjału elektrokinetycznego.

EN

In this paper two TiO2 powders with amine groups were prepared by the sol-gel technique, applying titanium(IV)(triethanolaminato)-isopropoxide (TEAIP) as a precursor. Two TiO2 powders differing in the content of amine groups has been prepared (TiO2-13 and TiO2-14). Particle sizes of the TiO2 powders were investigated by zeta potential. Influence of the amount of TEAIP on absorption in the UV-Vis range and porosity of TiO2 powders was studied.

2

A new method of determination of collagen conjugated with keratin

Safandowska M., Pietrucha K.

Autex Research Journal

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2013

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Vol. 13, no. 2

37--39

EN

The paper describes the possibility of using Sirius red dye for the determination of collagen conjugated with keratin of wool. Sirius red assay was shown to be feasible for collagen detection, which was enzymatically coupled onto wool fibers and woven fabric. The effectiveness of combination of keratin protein with collagen was evaluated.

3

Quantitative analysis of the polyurethane composites with non-organic nanofiller for use in implants of intervertebral disc

Waśniewski B., Ryszkowska J., Skalski K., Pawlikowski M.

Archive of Mechanical Engineering

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2012

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Vol. LIX, nr 2

137-153

EN

The aim of this research was to develop a composite material to be used as an elastomeric core of the artificial intervertebral disc. Two types of polyurethane composites with non-modified SiO2 and SiO2 modified NH2 group were obtained. The composites made of these materials have different filler content. The effect of modifying fillers for the structure and properties of these materials were investigated.

PL

Celem pracy było opracowanie kompozytu do zastosowań na elastomerowy rdzeń sztucznego krążka międzykręgowego. Wytworzono dwa rodzaje kompozytów poliuretanowych zawierających niemodyfikowany SiO2 jak również SiO2 modyfikowany grupami NH2. W ramach pracy przeanalizowano wpływ modyfikacji napełniacza na strukturę i właściwości wytworzonych materiałów.

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Osłony grupy aminowej w D-glukozaminie

Bednarczyk D., Myszka H.

Wiadomości Chemiczne

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2001

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[Z] 55, 5-6

491--515

EN

Aminosugars widely exist as a part of biologically important natural products. They are found in some antibiotics, polysaccharides, lipopolysaccharides, glycolipides, glycoproteins and blood group determinants. Most wide-spread aminosugars are 2-amino-2-deoxyaldoses and among them D-glucosamine. Because of its abundance of occurrence and function fulfilled, this aminosugar is often used in the synthesis of glycosides, as well as a glycosyl donor or acceptor. The methods of synthesis of glycosides have been well known for many years. The classical Koenigs-Knorr method is one of the oldest methods for the preparation of glycosides and requires glycosyl halides as donors (most often bromide or chloride) and heavy metal salts (mainly mercury and silver) as a promoter. The alternative procedure is the imidate method, which requires the use of 1-O-trichloroacetimidate derivative of sugar as glycosyl donor and BF3 ź Et2O or trimethylsilyl triflate as promoter. Apart from these two ways, others should be mentioned, namely: the orthoester and thioglycoside method, those methods using of glycals, 1,2-anhydrosugars and pent-4-enyl glycosides. However, these methods have been known for many years ( and still modified ( the selective synthesis of glycosides still determines the main challenge in the chemistry of carbohydrates. The course of reaction, its stereoselectivity, speed and yield depend on many factors, the most important of which seem to be: the leaving group at the anomeric carbon atom in donors, the conditioners of the reaction ( solvent, temperature, promoter and a character of the protecting groups at almost all carbon atoms ( especially at carbon C-2, as this group can constitute part of the so-called participating group in the process of creation of the glycoside bond. Description of the glycosylation mechanism can be found in many papers. Several new amino protecting groups have been described recently, particularly for the (NH2 function in D-glucosamine. Choice of the 2-amino protecting group is very important and will have a strong influence on the synthesis of the desired glycosides. In this paper we would like to describe the most popular protecting groups. They belong to different group-types, among which we can find: (i) amides ( acetyl (NHAc), trifluoroacetyl (NHTFAc), diacetyl (NdiAc), pent-4-enoyl (NHPent); (ii) imines ( p-methoxybenzylidene (NBzlOMe); (iii) carbamates ( allyloxycarbonyl (NHAloc), 2,2,2-trichloroethoxycarbonyl (NHTroc) and other alkoxycarbonyl (NHAlkoc) ; (iv) cyclic imides ( phthaloyl (NPhth), 4-nitrophthaloyl (NNP) , 4,5-dichlorophthaloyl (NDCP), tetrachlorophthaloyl (NTCP), diphenylmaleyl (NDPhM), thiodiglycoloyl (NTDG) and dithiasuccinoyl (NDts), which are exemplified below.