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1

Wpływ warunków suszenia rozpyłowego soku buraka ćwikłowego na wybrane właściwości otrzymywanego proszku

100%

Gawalek J. , Bartczak P.

Żywność Nauka Technologia Jakość

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2014

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tom 21

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nr 2

PL

W pracy przeanalizowano proces suszenia rozpyłowego koncentratu soku buraka ćwikłowego na nośnikach maltodekstrynowych. Badania wykonano na stanowisku doświadczalnym, którego zasadniczym elementem była suszarka rozpyłowa Niro Atomizer FU 11 DA z rozpryskiem cieczy dokonywanym za pomocą wirującego dysku rozpyłowego. Przebadano wpływ wybranych parametrów procesowych, takich jak: udział nośnika w suchej masie produktu, stopień scukrzenia (DE) maltodekstryny zastosowanej jako nośnik, temperatura powietrza wlotowego do suszarki i prędkość obrotowa dysku rozpylającego na właściwości proszku z soku buraka. Analizowano rozmiar uzyskiwanych cząstek proszku, gęstość nasypową, sypkość, rozpuszczalność w wodzie oraz zawartość barwników czerwonych. Stosowanie nośników o niskim DE umożliwiło uzyskanie dobrej sypkości i wysokiego stopnia retencji barwników czerwonych w proszkach. Wzrost zawartości nośnika powodował mniejsze straty barwników czerwonych w trakcie suszenia i lepszą sypkość proszków. Stosowanie wyższych temperatur wlotowych powietrza z jednej strony decydowało o zwiększeniu rozmiaru cząstek i poprawie sypkości proszków, z drugiej zaś wpływało na obniżenie stopnia retencji barwników czerwonych. Z kolei zmniejszanie częstości obrotów dysku rozpyłowego przyczyniało się do zwiększania cząstek proszków i poprawę sypkości, ale nie wpływało w sposób znaczący na stopień retencji barwników czerwonych.

EN

In the paper analysed was the spray drying process of red beet juice concentrate with maltodextrins applied as carriers. The research was performed on an experimental bench, where the key element was a Niro Atomizer FU 11 DA spray dryer with a rotary atomizer to spray/atomize liquids. The effect of the following selected process parameters was determined on the properties of the powder made from red beet juice: content of the carrier in the dry matter of the product, dextrose equivalent (DE) of maltodextrin used as a carrier, inlet air temperature in the spray dryer and rotational speed of the rotary atomizer. The following was analysed: size of the powder particles obtained, bulk density, powder flowability, water solubility, and content of red pigments. The application of carriers with a low DE made it possible to achieve a good level of flowability and a high level of retention of red pigments in the powders. The increase in the content of carrier resulted in lower losses in the red pigments during drying and in a better flowability level of powders. The effect of applying higher temperatures of inlet air was that the size of particles increased and the flowability of powders improved; but, on the other hand, the retention level of red pigments decreased. Then, reducing the rotational speed of atomizer caused the size of particles to increase and the powder flowability to improve; however, it did not significantly impact the retention level of red pigments.

2

Removal of lead(II) ions by an adsorption process with the use of an advanced SiO2/lignin biosorbent

80%

Klapiszewski Ł. , Bartczak P. , Szatkowski T. , Jesionowski T.

Polish Journal of Chemical Technology

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2017

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tom Vol. 19, nr 1

48--53

EN

We demonstrate here that lignin can be successfully combined with silica to create a multifunctional material with considerable sorption capabilities. Experiments were carried out in which a silica/lignin hybrid was used for the removal of lead(II) ions from water solutions. Adsorption kinetics were also determined and preliminary regeneration tests were performed. The effectiveness of the adsorption process depends on the following parameters: contact time of adsorbent and adsorbate (equilibrium times: 5 min for concentration 25 mg/L, 10 min for 50 and 75 mg/L, 60 min for 100 mg/L), pH (optimal pH = 5) and adsorbent mass. The kinetics of the adsorption of lead(II) ions on the SiO2/lignin biosorbent are best described by a pseudo-second-order model. Adsorption isotherms of lead(II) ions were also determined. The experimental data were found to be in agreement with the Langmuir model, and the maximal sorption capacity of the adsorbent with respect to lead(II) was 89.02 mg/g.

3

Influence of calcination parameters on physicochemical and structural properties of co-precipitated magnesium silicate

61%

Ciesielczyk F. , Bartczak P. , Klapiszewski L. , Paukszta D. , Piasecki A. , Jesionowski T.

Physicochemical Problems of Mineral Processing

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2014

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tom Vol. 50, iss. 1

119--129

EN

Physicochemical properties of different oxide systems depend mostly on the method of their preparation and classification, so the main aim of the study was to obtain the MgO·SiO2 hybrid in an aqueous solution and its calcination under assumed conditions. Research scope included evaluation of the effect of the basic parameters of the calcination process (time and temperature) on the structural properties of the final materials. Products obtained by the proposed method were thoroughly characterized. The chemical composition, crystalline structure, morphology and nature of the dispersion as well as parameters of the porous structure were established. The results of research in a decisive manner confirmed the possibility of designing the properties of inorganic oxide systems such as MgO·SiO2, which will definitively scheduled into potential directions for their use.

4

New Photometric and Spectroscopic Observations of the Eclipsing Binary V2080 Cygni

51%

Dimitrov W. , Kamiński K. , Bąkowska K. , Kamińska M. K. , Tokarek J. , Pawłowski M. , Boneva D. , Bartczak P. , Kwiatkowski T. , Schwarzenberg-Czerny A.

Acta Astronomica

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2022

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tom Vol. 72, No. 1

55--67

EN

We present new spectroscopic and photometric measurements of the eclipsing binary V2080 Cyg. It is a detached system with similar components and an orbital period of 4.9 d. We collected spectroscopic data with two instruments, 1.88 m DDO telescope equipped with Cassegrain spectrograph and 0.5 m PST1 connected to a fiber-fed echell\'e spectrograph. We collected 127 measurements for each component, which significantly increase the number of available radial velocity measurements for the V2080 Cyg system. Obtained masses of the eclipsing components are M1=1.189± 0.007 and M2=1.138±0.007 M☉. We also collected a multicolor photometry. The three-band light curves obtained together with the radial velocity data enabled us to calculate the model of the system. New estimations of the orbital inclination and radii of the components were computed. We obtained as well new times of minima. The O-C diagrams indicate variation, which requires more recent data to be confirmed. The possible existence of a third body could cause a light-time effect in the system. In addition, we analyze the Gaia mission results. V2080 Cyg A has three visual companions. However, according to Gaia parallaxes and proper motions, they cannot be dynamically connected with the eclipsing binary and therefore are background stars.

5

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.