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The influence of collagen from various sources on skin parameters

Prus W., Kozlowska J.

Engineering of Biomaterials

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2018

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Vol. 21, no. 146

14--17

EN

Collagen is the main component of connective tissue – it represents 30% of total proteins in the animal body. This protein occurs in a wide range of tissues, e.g. in bone, skin, tendon, ligaments and cornea. It provides structural integrity, strength, resistance to tensile stress and elasticity. Due to its excellent biocompatibility and controlled biodegradability, collagen has found diverse application in the biomedical field such as wound dressing, drug carrier and tissue engineering. However, concerns about contamination of mammalian collagen have stimulated the search of another source of this biopolymer. Fish wastes are thought to be an attractive and safe new source of collagen. Fish and mammalian collagen differ in physical and chemical properties. The aim of this work was to examine the influence of collagen extracted from different sources (rat tail tendons, fish scales of northern pike (Esox lucius) and fish skin of Brama australis) on skin parameters such as hydration, colour, pH and skin’s barrier quality. The measurements had been taken on the skin surface before as well as after application of the collagen solutions. The most harmful effect on skin parameters was observed after application of rat tail collagen solution. Collagen extracted from scales of Esox lucius showed the most favourable effect on the skin parameters. The source of collagen has a significant influence on its effectiveness. The greatest virtues for human body were observed in the case of fish collagen extracted from Esox lucius scales.

2

Mechanical properties of porous collagen/ gelatin/ hydroxyethyl cellulose matrices containing microspheres based on sodium alginate

Kozlowska J., Tybinkowska O., Sionkowska A.

Engineering of Biomaterials

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2018

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Vol. 21, no. 148

84

3

Cyclodextrines as an modifying agent for protein matrices

Skopińska-Wiśniewska J., Kozlowska J., Bajek A., Sionkowska A.

Engineering of Biomaterials

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2018

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Vol. 21, no. 148

85

4

Selective removal of Ag(I) and Cu(II) by plasticizer membranes with n-(diethylthiophosphoryl)-aza[18]crown-6 as a carrier

Kolodziejska M., Kozlowski C., Kozlowska J., Ulewicz M.

Physicochemical Problems of Mineral Processing

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2014

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Vol. 50, iss. 1

237--247

EN

The competitive transport of equimolar mixtures of Ag(I) and Cu(II) ions from aqueous source phase (cMe = 0.001 mol/dm3) across polymer inclusion membranes PIMs with N-(diethylthiophosphoryl)aza[18]crown-6 as ion carriers, was studied. The influence of pH of source phase and metal concentration on an efficiency of silver(I) transport through polymer inclusion membranes containing cellulose triacetate as the support and o-nitrophenyl pentyl ether as the plasticizer was studied. The transport selectivity order for the PIM with N-(diethylthiophosphoryl)-aza[18]crown-6 was: Ag(I) >> Cu(II). The metal cations transport rate can be explained by size and nature of substituent in lariat ether molecule, which prefer formation of Ag(I) complex in the membrane phase.

5

The Efficient Synthesis of Azaamino Acids

Wieczerzak E., Kozlowska J., Łankiewicz L., Grzonka Z.

Polish Journal of Chemistry

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2002

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Vol. 76 / nr 12

1693-1697

EN

An efficient method of synthesis of N-t-butoxycarbonyl-azaamino acid ethyl esters has been described. This method consisted of three stages including: hydrazone formation, its reduction and acylation with ethyl chloroformate. The second step - reduction of the hydrazones to the appropriate hydrazides - was the most challenging. Some reducing agents have been tested, though NaBH3CN was found to lead to the final products with the highest yields in relatively short time and even to allow the selective reduction of C-N bond in the presence of nitro group.

6

Reliability of distributed networks

Kozlowska J.

Systems Science

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2001

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Vol. 27, nr 2

119-126

EN

Reliability of the communication network is one of its most important characteristics. When designing maximally reliable networks, subject to fixed cost constraints, the objective is to maximize the value of a chosen reliability criterion. Recently, the number of alternative routes in the networks is assumed to be the measure of reliability. In this paper, two methods for constructing highly reliable non-hierarchical communication networks are described. In the first method, we assume that all the links have the same cost of construction. For the different costs of construction of the links we propose the heuristic design method of non-hierarchical network, which has the required number of alternative routes, and which has the minimum cost. This heuristic method uses simple matrix calculation, which is suitable for a super-computer. The minimization of the large network cost under the constraints of the number of independent routes, can be done fast. In this paper, there is shown the error of heuristic method for different constraints of the reliability and different topologies of networks.

7

Selected applications of cyclodextrin polymers

Kozlowska J., Kolodziejska M., Moryn S., Sliwa W.

Ars Separatoria Acta

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2012/2013

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No. 9/10

37--54

EN

The review consists of two parts. In the first part selected properties of CD polymers which are useful for their application are presented; their network and gelation properties, along with their adsorption capacities and stabilities, are described here. In the second part, various applications of CD polymers of commercial interest, as well those which are promising in the medicinal field, are shown.

8

N-(diethylthiophosphoryl)-aza[18]crown-6: synthesis and ability of solvent extraction toward lead(II), zinc(II) and cadmium(II) metal cations

Kozlowska J., Miroshnichenko S.

Ars Separatoria Acta

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2012/2013

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No. 9/10

7--14

EN

This work presents the synthesis of a strongly hydrophobic, functionalized monaza crown ether, i.e., lariat ether, namely N-(diethylthiophosphoryl)-aza[18]crown-6 and its application as ion extractant in solvent extraction systems. The synthesis of thiophosphorylated aza[18]crown-6 was performed with good yield. Separation systems have been successfully developed to extract Pb(II), Cd(II) and Zn(II) into organic phase, i.e., chloroform with the crown ethers: aza[18]crown-6 and N-(diethylthiophosphoryl)-aza[18] crown-6 as extractants. The selectivity order in both crown ethers was Pb(II) >> Cd(II) > Zn(II). The obtained results suggest that N-(diethylthiophosphoryl)-aza[18]crown-6 can be used for the selective removal of Pb(II) at lower pH values than aza[18]crown-6.