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1

The properties of fish skin collagen films after cross-linking with tannic acid

Sionkowska Alina, Lewandowska Katarzyna, Szulc Marta, Brudzyńska Patrycja, Kulka Karolina, Piwowarski Łukasz

Engineering of Biomaterials

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2023

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vol. 26, no. 168

9--14

EN

Over the last three decades, an increasing interest in the preparation of new materials for wound healing has been observed. Collagen is a widely used biomaterial, and especially fish skin collagen is more and more popular among scientists. This study aimed to obtain thin films from native fish skin collagen and collagen cross-linked with tannic acid. Infrared spectroscopy, mechanical test, topographic imaging, and swelling test were used to characterize the features of the mentioned films. Statistical evaluation of the results was conducted with the Q-Dixon test. Infrared spectroscopy analysis showed that in the IR spectra of examined biomaterials, there are slight shifts in band positions after tannic acid cross-linking. The mechanical properties of the cross-linked material were different from those of the native collagen film. The Young’s modulus was higher for cross-linked collagen, whereas the elongation at break was lower than for pure collagen. The swelling of the collagen films increased after cross-linking with tannic acid. Swelling tests indicated that collagen cross-linked with tannic acid absorbs more water than before cross-linking. The properties of collagen films were significantly improved after tannic acid cross-linking. All alterations can be a result of collagen cross-linking by tannic acid, probably by forming hydrogen bonds between collagen and tannic acid.

2

The behaviour of tannic acid adsorption on fluorite surface: isotherm, kinetic and thermodynamic studies

Tangarfa Mariam, Semlali Aouragh Hassan Naoul

Physicochemical Problems of Mineral Processing

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2022

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Vol. 58, iss. 1

77--87

EN

Fluorite is an important mineral to produce hydrofluoric acid. As fluorite resources contain calcite as a gangue mineral, the separation between these two calcium containing minerals is difficult. Tannic acid is the most commonly used reagent as a depressant to separate fluorite from calcite by flotation. To enhance this separation, it is so primordial to understand tannic acid physicochemical reactivity via these minerals. Therefore, the aim of this work is to investigate the mechanism of tannic acid adsorption on the fluorite surface by experimental study using isotherm, kinetic and thermodynamic. Adsorption isotherm modelling results showed that the adsorption process is well described by Sips model. On the other hand, the kinetic and thermodynamic require firstly the adsorption study as a function of three main reactional parameters including initial tannic acid concentration, solution pH and temperature. This study showed that acidic pH as well as initial tannic acid concentration increase and temperature decrease promote the studied adsorption. These finding were then exploited to determine the adsorption mechanism by pseudo n order kinetic model adjustment to experimental kinetic data using nonlinear regression method. Obtained high correlation coefficient and low mean absolute error at 95 % confidence level showed good agreement of experimental kinetic data with the tested model. These results revealed that the mechanism of tannic acid adsorption onto fluorite was attributed to a chemical reaction. In addition, the thermodynamic study showed that the studied adsorption process was exothermic.

3

Mechanical properties of the porcine pericardium extracellular matrix cross-linked with glutaraldehyde and tannic acid

Dąbrowska Karolina Zofia, Turek Artur, Grzejda Rafał, Kobielarz Magdalena

Acta of Bioengineering and Biomechanics

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2022

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Vol. 24, no. 3

21--31

EN

The aim of this study was to determine the influence of factors such as temperature and glutaraldehyde (GA) concentration on the mechanical properties of porcine pericardia, in order to propose the recommended optimal conditions of a cross-linking process. It was also to verify whether tannic acid (TA), a natural cross-linking agent that stabilizes collagenous tissues by a different mechanism than GA, may positively influence the strength of pericardium. Methods: The samples were incubated at various temperatures (4, 22, and 37 °C) and GA concentration solutions (0.6, 1.5 and 3%) for 7 days. Three series were selected and additionally cross-linked with 0.3% TA for another 7 days. Mechanical properties of cross-linked pericardium samples, i.e., ultimate tensile strength (UTS) and elastic modulus (E) were measured in uniaxial tensile testing. The hyperelastic model for incompressible materials – isotropic by Ogden [24] and anisotropic by Fung [7] were utilized to describe the mechanical behaviour of treated pericardium. Results: The temperature has an influence on cross-linking effects; the lowest values of UTS were reported for specimens cross-linked at 22 °C, while the mechanical properties of series treated at 4 °C or 37 °C were comparable. At a particular temperature of incubation, the GA concentrations have not affected the mechanical properties of tissues. The dependence between mechanical parameters and agent concentration was only observed for specimens treated with GA at 37 °C. Conclusions: The conditions of the cross-linking process affect the mechanical properties of the porcine pericardium. Room temperature (22 °C) and the concentration of 1.5% GA occurred to be ineffective. The mechanical properties of GA-treated pericardium were improved by an additional TA cross-linking.

4

Preparation and characterization of calcite for tannic acid adsorption: Optimization by response surface methodology coupled by Box-Cox transformation procedure

Tangarfa Mariam, Semlali Aouragh Hassani Naoul, Alaoui Abdallah

Physicochemical Problems of Mineral Processing

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2021

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Vol. 57, iss. 3

36--45

EN

Calcite depression is the most effective physicochemical process to valorize fluorine mineral. This process is achieved by adsorption of tannic acid, as the commonly used reagent, onto calcite. Adsorption investigation is very important in mineral processing. The present work focuses on optimization of physicochemical parameters of tannic acid adsorption onto calcite. Experimental study is carried out by a response surface methodology based on Box-Behnken design. Obtained results are exploited to develop a statistical model. Analysis of variance and residuals are performed to check the significance of tested models. Among these models, Cox-Box model predicts very well the obtained experimental data. This model shows that initial tannic acid concentration and solution pH as well as their interactions are the most significant parameters. Optimal conditions are achieved using the obtained statistical model. The present investigation is an important preliminary step to better understand calcite flotation behavior using tannic acid as a depressant.

5

Tannic acid as a hydrophobicity modifier for galena in the presence of metal ions

Guler T., Polat E.

Physicochemical Problems of Mineral Processing

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2017

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Vol. 53, iss. 1

5--16

EN

This study was performed to determine the effect of tannic acid (TA) on hydrophobicity of galena using Taguchi’s design of experimental methodology. Roles of metal ions, dithiophosphinate (DTPI) concentration, and conditioning time on TA-galena interaction were tested by contact angle measurements. Results were evaluated by analysis of variance (ANOVA) test. DTPI was found to be the most effective parameter on the hydrophobicity followed by TA and nobility of metal ions. Effect of conditioning time was statistically insignificant. Electrochemical activity of metal ions became effective on TA-galena interaction: more active metals exhibit synergic effect with TA on the hydrophilicity of galena whereas more noble metals reduced the adverse impact of TA. Taguchi’s design revealed that interactions between experimental variables were not statistically significant.

6

Otrzymywanie oraz charakterystyka skafoldów sieciowanych kwasem taninowym na bazie chitozanu, kolagenu oraz kwasu hialuronowego

Kaczmarek B., Sionkowska A., Markiewicz E., Kołodziejczak A.

Engineering of Biomaterials

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2016

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Vol. 19, no. 136

21--27

PL

Biopolimery są szeroko stosowane w dziedzinie biomateriałów. Są biokompatybilne, biodegradowalne oraz nietoksyczne dla ludzkiego organizmu. Celem niniejszych badań eksperymentalnych było otrzymanie kompozytów na bazie kolagenu, chitozanu oraz kwasu hialuronowego modyfikowanych poprzez dodatek kwasu taninowego. Biopolimery zostały wymieszane poprzez sporządzenie 1% roztworów każdego z nich, przy czym kolagen oraz chitosan były wymieszane w stosunku wagowym 50/50 oraz do tej mieszaniny zastosowano 1, 2 i 5 (w/w%) dodatek kwasu hialuronowego. Do mieszaniny dodano następnie 2, 5, 10 oraz 20 (w/w%) kwasu taninowego oraz otrzymano skafoldy metodą suszenia sublimacyjnego. Próbki zarówno z dodatkiem kwasu taninowego jak i bez niego zostały scharakteryzowane poprzez pomiar ich właściwości mechanicznych, analizę spektroskopii w podczerwieni (IR-ATR) oraz obrazowanie przy użyciu skaningowego mikroskopu elektronowego (SEM). Ponadto wyznaczono porowatość oraz gęstość każdego ze skafoldów. Wszystkie otrzymane próbki były porowate i nie zaobserwowano znaczących różnic w strukturze na zdjęciach SEM. Na widmach IR-ATR charakterystyczne piki polimerów takie jak: amidowe I, II, III oraz A były przesunięte po dodatku taniny w wyniku pojawienia się wiązań wodorowych oraz oddziaływań elektrostatycznych. Wyniki pokazują, że kwas taninowy może być wykorzystany jako czynnik sieciujący stosowany w celu modyfikacji właściwości biomateriałów.

EN

Biopolymers are widely used in biomaterials science. They are biocompatible, biodegradable and non-toxic for human body. The aim of the study was to obtain scaffolds made of chitosan, collagen and hyaluronic acid modified by addition of tannic acid. The biopolymers were mixed as 1% solution, where collagen and chitosan were mixed in 50/50 (w/w%) and 1, 2 and 5 (w/w%) of hyaluronic acid was added. 2, 5, 10 and 20 (w/w%) of tannic acid was added to the mixture and scaffolds were obtained by freeze drying method. Samples with the tannic acid as well as without it were characterized by the mechanical parameters measurement, infrared spectroscopy (IR-ATR) and scanning electron microscopy (SEM). Moreover the porosity and density of the scaffolds were determined. The addition of tannic acid improves the mechanical properties and porosity of the scaffolds. All the scaffolds were porous and no significant changes in the structure were observed at the SEM images. In the IR-ATR spectra characteristic peaks of polymers as amide I, II, III and A were shifted after addition of tannic acid due to the presence of new hydrogen bonds and electrostatic interactions. The results show that tannic acid can be used as a cross-linking agent to modify the properties of the scaffolds.

7

Characterization of chitosan, collagen, hyaluronic acid blends crosslinked by tannic acid addition

Sionkowska A., Kaczmarek B., Kołodziejczak A., Markiewicz E.

Engineering of Biomaterials

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2016

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Vol. 19, no. 138 spec. iss.

43

8

Tannic acid as a cost-effective substitute for saponin in soil remediation

Gusiatin Z. M., Bułkowska K., Pokój T.

Environmental Biotechnology

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2014

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Vol. 10, No. 2

66--72

EN

The efficiency of soil washing with tannic acid (TA) and saponin (SAP) was compared. In the contaminated soil, Cu and Zn were more mobile than Pb. At 3% concentration, both biosurfactants removed similar amounts of Zn (48 and 54%, respectively), SAP removed somewhat more Cu (81%), and TA removed considerably more Pb (63%). SAP removed more Cu due to its higher number of carboxylic groups. TA dissolved the more stable forms of metals because of its higher acidity resulting from the content of phenolic groups. Based on the potential ecological Risk Index (RI), both biosurfactants reduced the risk posed by the contaminated soil from "considerable" (RI=364 ) to "low" (RI=118, on average). These results, and the fact that TA is more than three times less expensive than SAP, make TA an attractive substitute for SAP in soil washing.

9

Eco-Friendly Soaking Process Using Tannic Acid as an Alternative Bactericide

Zengin A. C. A., Çolak S. M., Zengin G., Kiliç E.

Archives of Environmental Protection

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2014

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Vol. 40, no. 1

3--12

EN

Eco-friendly leather processes based on the usage of natural products have become a potentially attractive issue for leather industry during the last few decades. Synthetic protective chemicals like bactericides used in most soaking process are known as hazardous substances and cause tannery effluents with high concentrations of Chemical Oxygen Demand (COD). In the present study, the effect of tannic acid on microorganisms, skin, wool and effluent were investigated in order to demonstrate the applicability of tannic acid in soaking process instead of commonly used bactericides. The bacterial load (cfu/ml), COD and Nitrogen Content (N) of the soaking effluents and Total Kjeldahl Nitrogen (TKN) content of skins and wools were investigated. Application of 0.5 and 1 wt% tannic acid concentrations was more effective than commercial bactericide, while comparable results were achieved by 0.1 and 0.3 wt% tannic acid. The application of tannic acid for soaking process resulted in lower COD and N values of effluents. The results show that tannic acid has the potential to be an alternative, eco-friendly bactericide for leather industry by reducing the pollution of leather soaking process.

10

Morphological studies of tissues stabilized by glutaraldehyde and tannic acid

Turek B., Marcinkowski A., Cwalina B., Nożyński J., Dzierżewicz Z.

Engineering of Biomaterials

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2009

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Vol. 12, no. 89-91

32--34

EN

Despite the disadvantages of glutaraldehyde (GA)-stabilization of tissues, it is the method most often used for xenogeneic tissues preparation. Nowadays, partial elimination of drawbacks of this method is achieved by using GA in the mixture with other crosslinking reagents, which completes the stabilization effects and acts synergistically. The aim of this work was to determine microstructure and nanostructure of porcine pericardium stabilized by GA and tannic acid (TA). The microstructure was examined by optical microscopy and the nanostructure by atomic force microscopy (AFM). Different results on the level of micro- and nanostructure were observed. No essential changes in the tissue morphology after crosslinking with GA and TA were observed under optical microscope, but significant morphological differences were revealed in AFM studies.

11

Naturalne inhibitory korozji miedzi w wodzie pitnej

Drela I., Falewicz P., Klakočar-Ciepacz M., Lesiak T.

Ochrona przed Korozją

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2006

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nr 12

400-402

PL

Przedstawiono wyniki badań korozyjnych miedzi w wodzie pitnej, zawierającej wybrane naturalne kwasy organiczne: fitynowy, taninowy i L-askorbinowy, otrzymane metodą polaryzacji potencjokinetycznej. Stwierdzono, że wszystkie badane kwasy wykazują właściwości inhibitowania korozji miedzi w zakresie stężeń 0,5-4,0 mg/dm3, przy czym wzrost stężenia powyżej 2 mg/ dm3 powoduje powolny wzrost prądu korozyjnego. Najlepsze właściwości ochronne w stosunku do miedzi wykazuje kwas fitynowy, dla którego przy stężeniu ok. 1,5 mg/dm3 skuteczność ochrony przed korozją osiąga wartość ok. 34%.

EN

The results of potential sweep method corrosion investigations of copper exposed to potable water containing selected natural organic compounds i.e. phytic, tannic and L-ascorbic acids, have been presented. It has been found that all the investigated acids manifest inhibiting properties in the 0.5-4.0 mg/dm3 concentration range; however an increase in the concentration to over 2 mg/dm3 results in the gradual rise of the corrosion current. It has been discovered that phytic acid, when added to water, shows the best copper corrosion protection properties. At a concentration of 1.5 mg/dm3 the corrosion efficiency reaches a value of up to 34%.

12

Zmiany naprężenia w tkance osierdzia podczas jej modyfikacji kwasem taninowym

Cwalina B., Turek A., Jastrzębska M., Fluder A., Kostka P.

Inżynieria Biomateriałów

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2002

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R. 5, nr 23-25

67-70

PL

Badano zmiany naprężenia powstające w tkance osierdzia włóknistego świni podczas jej sieciowania za pomocą kwasu taninowego (TA). Równocześnie analizowano wpływ czasu modyfikacji na właściwości wytrzymałościowe biomateriału tkankowego. Stwierdzono, że proces modyfikacji tkanki osierdzia za pomocą TA przebiegał w trzech etapach, odzwierciedlonych przez zmiany wielkości naprężeń powstających w tkance. Wyniki sugerują, że naprężenia te mogą decydować o stabilności mechanicznej biomateriałów w warunkach in vivo. Czas modyfikacji tkanek warunkuje otrzymanie biomateriału o określonych właściwościach wytrzymałościowych. Procedura badań wytrzymałościowych zastosowana w tej pracy może być przydatna w doborze substancji sieciującej, a także w optymalizacji warunków utrwalania tkanek osierdzia (czas, temperatura, stężenia odczynników).

EN

Stress changes arising in fibrous pericardium tissue during its crosslinking by means of tannic acid (TA) have been investigated. The influence of modification time on mechanical properties of tissular biomaterial has been analyzed simultaneously. It has been found that the process of the pericardium tissue modification with TA took place in three stages, reflected by changes in quantity of stresses originated in tissue. The results suggest that these stresses may determine mechanical stability of biomaterials under in vivo conditions. Obtaining the biomaterial possessing specific mechanical properties is conditioned by the modification time. Procedure of mechanical investigations used in this work may be helpful for the crosslinking substance selection and also for optimization of the pericardial tissues-fixation circumstances (time, temperature, concentration of reagents).

13

Wpływ antybiotyków na strukturę tkanki osierdzia świni

Turek A., Cwalina B., Pawlus-Łachecka L., Nożyński J.

Inżynieria Biomateriałów

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2002

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R. 5, nr 23-25

57-61

PL

Badano zmiany struktury tkanek osierdzia świni: natywnych i modyfikowanych za pomocą kwasu taninowego (TA), pod wpływem roztworu antybiotyków, stosowanego do przechowywania implantów tkankowych. Stwierdzono, że antybiotyki powodowały zwiększenie stabilności biochemicznej i strukturalnej tkanek osierdzia - zarówno natywnej, jak i modyfikowanej za pomocą TA. Wzrost stabilności biochemicznej odzwierciedlał się w mniejszej ilości białek niskocząsteczkowych ekstrahowanych z tkanek poddanych działaniu antybiotyków. Wyniki te sugerują również, że antybiotyki mogą uczestniczyć w sieciowaniu tkanki osierdzia. Badania histologiczne wykazały stabilność struktury tkanek poddanych działaniu antybiotyków.

EN

Investigated were changes in structure of porcine pericardium tissues: native and modified by means of tannic acid (TA), under the influence of antibiotics solution used for storage of tissue implants. It has been found that antibiotics caused increase in biochemical and structural stability of pericardium tissues - both native and modified by means of TA. Growth in biomechanical stability was reflected smaller amounts of low-molecular proteins extracted from tissues treated with antibiotics. These results suggest also that antibiotics may participate in crosslinking of pericardium tissue. Histological investigations indicated stability of the tissues treated with antibiotics.

14

Using of avance oxidation processes to decompose tannic acid in aqueous solutions

Karbowska U., Jóźwiak W. K., Perkowski J.

Polish Journal of Chemical Technology

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2001

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Vol. 3, nr 3

8-9

EN

This work is about advance oxidation of tannic acid aqueous solutions using advance oxidation complex systems (H2O2/O3, H2O2/UV, O3/UV and H2O2/O3/UV). In these researches the technique of Total Organic Carbon control, spectrometry UV7VIS, COD and pH control was used. We stated that advance oxidation method using H2O,/O3/UV system in optimal temperature of 60°C allow gaining much better results then oxidation using single oxidation factor or their double combinations.

15

Wpływ kwasów taninowego i fitynowego na korozję miedzi w wodach naturalnych.

Drela I.

Rudy i Metale Nieżelazne

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1999

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R. 44, nr 1

20-23

PL

Przedstawiono wpływ kwasów taninowego i fitynowego na zachowanie korozyjne miedzi oraz na zanieczyszczenie wody solami miedzi w wodach naturalnych o podwyższonej agresywności, ze szczególnym uwzględnieniem korozji wżerowej. Na podstawie elektrochemicznego testu korozyjnego określono podstawowe parametry procesu korozji miedzi oraz optymalną zawartość kwasu taninowego w wodzie dla zapewnienia inhibitowania korozji wżerowej.

EN

The influence of tannic and phytic acids on corrosion behaviour of copper and on release of the by-products of copper corrosion in waters with increased the pitting tendency was investigated. Based on electrochemical corrosion test there were determined the basic parameters of copper corrosion process and the optimum concentration of tannic acid for inhibition of copper pitting corrosion.