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Wyświetlanie 1-15 z 17
Tytuł:
Comparison of morphological traits and mineral content in Eucomis autumnalis (mill.) Chitt. Plants obtained from bulbs treated with fungicides and coated with natural polysaccharides
Autorzy:
Salachna, P.
Zawadzińska, A.
Powiązania:
https://bibliotekanauki.pl/articles/125342.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
pineapple lily
oligochitosan
sodium alginate
macronutrients
micronutrients
Opis:
Eucomis autumnalis is an attractive ornamental species from the South Africa, commonly used in natural medicine. Plant protection programs, particularly those concerning plants grown for phytotherapeutics, are focused on prophylactic treatments that facilitate a limited use of pesticides negatively affecting the environment. Polysaccharides, such as chitosan and sodium alginate are exemplary non-toxic and biodegradable substances used for hydrogel coatings. The aim of this study was to investigate the effects of treating E. autumnalis bulbs with fungicide or coating with natural polysaccharides on the morphological traits and content of minerals in the leaves and bulbs. Prior to planting, the bulbs were divided into three groups: (I) untreated bulbs (control); (II) bulbs treated with Kaptan and Topsin fungicides; (III) bulbs coated with oligochitosan and sodium alginate. Bulb coating was found to exert a stimulating effect on plant height, number and length of leaf, greenness index (SPAD), number of flowers per inflorescence, fresh weight of the aboveground part and fresh weight of bulbs. The leaves and bulbs of plants grown from coated bulbs contained more nitrogen, potassium and boron. Treating the bulbs with fungicides positively affected the number of leaves, greenness index and fresh weight of the aboveground part.
Źródło:
Journal of Ecological Engineering; 2015, 16, 2; 136-142
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Calcium alginate/activated carbon/humic acid tri-system porous fi bers for removing tetracycline from aqueous solution
Autorzy:
Sun, Qinye
Zheng, Heng
Li, Yanhui
Li, Meixiu
Du, Qiuju
Wang, Cuiping
Sui, Kunyan
Li, Hongliang
Xia, Yanzhi
Powiązania:
https://bibliotekanauki.pl/articles/949364.pdf
Data publikacji:
2020
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
Sodium alginate
Humic acid
Activated carbon
Adsorption
Tetracycline
Opis:
In this study, activated carbon and humic acid powder were fixed by the cross-linking reaction of sodium alginate. Calcium alginate/activated carbon/humic acid (CAH) tri-system porous fibers were prepared by the wet spinning method and freeze-dried for the removal of tetracycline in aqueous solution. Subsequently, the morphology and structure of CAH fibers were measured by scanning electron microscopy (SEM) and the Brunauer-Emmett-Teller (BET) method. The effect of pH, contact time, temperature and other factors on adsorption behavior were analyzed. The Langmuir and Freundlich isotherm models were used to fit tetracycline adsorption equilibrium data. The dynamics data were evaluated by the pseudo-second-order model, the pseudo-second-order model and the intraparticle diffusion model. Thermodynamic study confirmed that the adsorption of tetracycline on CAH fibers was a spontaneous process.
Źródło:
Polish Journal of Chemical Technology; 2020, 22, 3; 9-16
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of a novel depressant on the separation of talc and copper –nickel sulfide ore
Autorzy:
Gu, Guohua
Chen, Zhixiang
Zhao, Kaile
Song, Siyu
Li, Shuangke
Wang, Chongqing
Powiązania:
https://bibliotekanauki.pl/articles/110492.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
Sodium alginate
talc
copper–nickel sulfide
polysaccharide depressant
flotation
Opis:
This paper researched the influence of the polysaccharide polymer sodium alginate (SAG) on the depression of talc at a fixed room temperature about 25 °C through micro flotation and batch flotation experiments, zeta potential and contact angle measurements as well as infrared spectroscopy analysis. The flotation results displayed that the SAG had a significant influence on the flotation of talc but less influence on sulphide flotation. Compared with the depressant carboxymethyl cellulose (CMC) and guar gum, using of the SAG gave the highest copper recovery. It could not only eliminate a talc removal step, but also significantly decrease in the depressant consumption by half at least. Sodium alginate apparently adsorbs on the talc surface and promotes hydrophilization, as revealed by contact angle tests (contact angle decreased from 75 to 33° after treating with SAG). It is demonstrated that the SAG obviously absorbed at the surface of talc but rarely for chalcopyrite through the results of zeta potential measurements and infrared spectroscopy analysis.
Źródło:
Physicochemical Problems of Mineral Processing; 2019, 55, 1; 116-127
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Novel Bio-Waste Incorporated Alginate Sorbent for De-Fluoridation of Water
Autorzy:
Ayyappan, C. S.
Sreeja, S.
Bhalambaal, V. M.
Powiązania:
https://bibliotekanauki.pl/articles/124891.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
tamarind seeds
defluoridation
sodium alginate
column study
water purification
Opis:
This study evaluates the feasibility of using tamarind (Tamarindus indica) seed powder for de-fluoridation of fluoride contaminated water. Batch study confirmed that tamarind seeds in dry powder form could remove 87% of fluoride from water. This bio-sorbent can be used effectively in areas where fluoride concentrations are above the permissible limits of 1.5 mg·l-1 as per WHO Standard, 1984. Tamarind seed powder was incorporated in a matrix of sodium alginate and made into gel-beads. The beads were tested for de-fluoridation efficiency by conducting column studies. The effect of various factors, such as flow rate, retention time, and the number of runs on the efficacy of fluoride removal was also studied. The results revealed that flow rate did not seem to have much effect on the percentage fluoride removal but the fluoride concentration decreased drastically upon greater retention time and multiple runs.
Źródło:
Journal of Ecological Engineering; 2015, 16, 4; 8-13
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization of the preparation process stages of the bioink compositions based on sodium alginate and gelatin to improve the viability of biological material contained in hydrogel 3d printouts
Autorzy:
Wierzbicka, Adrianna
Bartniak, Mateusz
Rosińska, Karolina
Bociąga, Dorota
Powiązania:
https://bibliotekanauki.pl/articles/2172009.pdf
Data publikacji:
2022
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
hydrogel
bioink
3D bioprinting
sodium alginate
gelatin
tissue engineering
Opis:
Currently developing on a large scale, the opportunities for 3D printing represent more and more perspective solutions in the area of tissue engineering and personalized medicine. Due to their ability to reproduce the natural extracellular matrix and unique properties, hydrogels are popularly used materials to produce bioinks designated for 3D printing. Today, solutions based on sodium alginate and gelatin are frequently used compositions for this purpose. The high viability of the cells incorporated into bioink is the key parameter determining the application opportunities of printed structures. The parameters of the process used for the preparation of hydrogel compositions may have a direct impact on the viability of the cells incorporated within the printed structure. This study aims to develop a protocol for the preparation of hydrogel materials based on alginate and gelatin, providing the highest viability of the model osteoblast-like cell line Saos-2 incorporated directly into the bioink before the 3D bioprinting process. In the scope of this study, the analyzed process parameters of the preparation of the hydrogel bioinks are the method of combination of a polymer solution with biological material, the applied concentration, the cross-linking solution, and also the waiting time of the prepared hydrogel bioink for the 3D printing process. A key aspect of the study is the evaluation of the influence of 3D printing on changes in the survival rate of biological material directly after the manufacturing process and after individual incubation periods of the printouts in conditions reflecting the body’s environment.
Źródło:
Engineering of Biomaterials; 2022, 25, 165; 7--16
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of Electrically Conductive Nanocrystalline Thin Film for Optoelectronic Applications
Autorzy:
Das, S K.
Islam, J. M. M.
Hasan, M.
Kabir, H.
Gafur, Md. A.
Hoque, E.
Khan, M. A.
Powiązania:
https://bibliotekanauki.pl/articles/412543.pdf
Data publikacji:
2013
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Conductive thin film
Composite
TiO2
Solar cell
Optoelectronics
Sodium alginate
Opis:
Sodium alginate (TiO2) sand composites were prepared by solution casting. Purified sand was added in the composite films to increase electrical conductivity. Electrical properties such as conductivity, capacitance, dielectric constant, and loss tangent of the composites were investigated. The current voltage characteristics for all the composites showed ohmic behavior. All the electrical properties have been found to improve with the incorporation of sand (SiO2) but 6 % sand containing composite exhibits the best electrical properties. The mechanical properties tensile strength (TS), elongation at break (Eb) and Young modulus for 6 % sand containing composite film are found to be 4.445 MPa, 9.76 %, and 72.8 MPa respectively. The experimental results reveal that the blended films exhibit higher stability and improved mechanical properties of both tensile strength and elongation at break in dry state. Water absorption properties of the composites are found to decrease with the increase of sand content. Lowest water uptake properties and highest stability were demonstrated by 6 % sand containing sample. Electrically conductive composite films have useful applications for solar cells and optoelectronics. Thus, this study is very much expected to aid in the design and selection of proper composite for the potential application of solar cell and optoelectronics.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2013, 10, 1; 90-101
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Production of co-immobilized dextransucrase and dextranase preparations and their application in isomalto-oligosaccharides synthesis
Autorzy:
Sikora, B.
Kubik, C.
Bielecki, S.
Powiązania:
https://bibliotekanauki.pl/articles/410401.pdf
Data publikacji:
2017
Wydawca:
Politechnika Łódzka. Wydawnictwo Politechniki Łódzkiej
Tematy:
dextranase
dextransucrase
co-immobilization
hydroxyapatite
sodium alginate
dekstranaza
dekstranosacharaza
hydroksyapatyt
alginian sodowy
Opis:
Dextransucrase (DS) from Leuconostoc mesenteroides and dextranase (DN) from Penicillium funiculosum were co-immobilized by entrapment in calcium alginate and used to produce isomaltooligosaccharides (IMOs) from sucrose. DS convert sucrose into dextran, which is thesubstrate for DN, so that IMOs are products of dextran hydrolysis. Before the co-immobilization DS was cross-linked with glutardialdehyde (GA), while DN was adsorbed on hydroxyapatite (HAp). Cross-linking was essential for the stability of DS and pre-immobilization of DN to prevent enzyme from leaking out of the alginate beads. Operational stability of co-immobilized preparations of DS and DN was estimated based on amounts of isomaltose and isomaltotriose formed during successive 24h processes of IMOs synthesis, carried out at 30oC, pH 5.4 and 200 rpm in 10% (w/v) sucrose solutions. Preparation characterized by the initial DS/DN activities ratio of 1/14 was found to maintain these activities at least 100 h of IMOs synthesis (5 repeated batch reaction).
Źródło:
Biotechnology and Food Science; 2017, 81, 2; 137-147
2084-0136
2299-6818
Pojawia się w:
Biotechnology and Food Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis and characterization of chitosan/sodium alginate blend membrane for application in an electrochemical capacitor
Autorzy:
Nowacki, Krzysztof
Galiński, Maciej
Stępniak, Izabela
Powiązania:
https://bibliotekanauki.pl/articles/1034054.pdf
Data publikacji:
2020
Wydawca:
Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
Tematy:
chitosan
electric double layer capacitor
gel electrolyte
lithium sulfate
sodium alginate
supercapacitor
Opis:
In this work, we report a stepwise formation method of a chitosan/sodium alginate polyelectrolyte complex (CS/SA PEC) membrane. The proposed method aiming at the utilization of the ultrasonic treatment of chitosan and sodium alginate solution allowed us to obtain a highly homogeneous hybrid membrane for electrochemical usage. The CS/SA PEC membrane saturated in a 2 M Li2SO4 aqueous solution was used in electrochemical double layer capacitor (EDLC) cell to study its applicability as quasi-solid electrolyte. Electrochemical characteristic of EDLC cells was determined by electrochemical impedance spectroscopy, cyclic voltammetry and galvanostatic charge/discharge methods. The results show that the EDLC cell with CS/SA PEC quasi-solid electrolyte exhibit a comparable specific capacitance (102 F g-1 for 0–0.8 V) to CS reference (100 F g-1 for 0–0.8 V) and commercial separator (99 F g-1 for 0–0.8 V) cells. Thus, the CS/SA PEC membrane can be considered as an alternative modification for chitosanbased materials of electrochemical purpose.
Źródło:
Progress on Chemistry and Application of Chitin and its Derivatives; 2020, 25; 174 - 191
1896-5644
Pojawia się w:
Progress on Chemistry and Application of Chitin and its Derivatives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact of Sodium Alginate and Dried Apple Pomace Powder as a Carrier Agent on the Properties of Freeze-Dried Vegetable Snacks
Autorzy:
Karwacka, Magdalena
Gumkowska, Martyna
Rybak, Katarzyna
Ciurzyńska, Agnieszka
Janowicz, Monika
Powiązania:
https://bibliotekanauki.pl/articles/2019141.pdf
Data publikacji:
2021-12-01
Wydawca:
Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
Tematy:
freeze-drying
vegetable snacks
sodium alginate
apple pomace
carrier agent
physicochemical properties
Opis:
The food industry is committed to supplying nutritious products that are attractive and convenient for consumers. Freeze-dried fruit and vegetable snacks that exemplify such products are difficult to obtain since it is necessary to use a carrier agent (usually a hydrocolloid ingredient) which meets the requirements of a sustainable development conceptual framework. Therefore, research has been undertaken to replace such a carrier agent with food waste fruit pomace. This study compared selected physicochemical properties of freeze-dried vegetable snacks obtained through the addition of sodium alginate and dried apple pomace powder in terms of the viability of replacing hydrocolloid carrier agents in freeze-dried products with fruit pomace. Three vegetable sets containing: yellow bean, carrot and potato were prepared and modified by adding diverse carrier agents. Snacks with the addition of dried apple pomace powder featured higher dry matter content and true and apparent density, but sodium alginate-structured products were harder and more porous. Dried apple pomace powder improved the health-promoting properties of the snacks, such as total phenolic content and antioxidant capacity. The type of additive also affected the internal structure of the products. The results indicate that the application of both dried apple pomace powder and sodium alginate as carrier agents can result in snacks characterised by repeatable quality, but it is unclear whether the total replacement of hydrocolloid is sustainably efficient.
Źródło:
Polish Journal of Food and Nutrition Sciences; 2021, 71, 4; 451-461
1230-0322
2083-6007
Pojawia się w:
Polish Journal of Food and Nutrition Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rheological and textural properties of hydrogels, containing sulfur as a model drug, made using different polymers types
Właściwości reologiczne i mechaniczne hydrożeli, zawierających siarkę jako modelową substancję leczniczą, sporządzonych z wykorzystaniem różnych polimerów
Autorzy:
Wróblewska, Magdalena
Słyż, Joanna
Winnicka, Katarzyna
Powiązania:
https://bibliotekanauki.pl/articles/945837.pdf
Data publikacji:
2019
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Chemii Przemysłowej
Tematy:
hydrogel
HEC
Carbopol 980
sodium alginate
sulfur
bioadhesion
hydrożel
alginian sodu
siarka
bioadhezja
Opis:
The preparation technology and the optimal composition of hydrogels with sulfur prepared using various types of polymers – hydroxyethyl cellulose (HEC), Carbopol 980, and sodium alginate – have been developed. Designed hydrogels were evaluated microscopically, for pH, viscosity and mechanical parameters. In addition, ex vivo bioadhesive properties of obtained hydrogels with hairless mice skin model as adhesive layer were estimated. Hydrogels with sulfur based on sodium alginate possessed the most favorable application properties and were stable at different temperature and humidity conditions during 90 days of storage.
Opracowano technologię otrzymywania i optymalny skład hydrożeli z siarką sporządzonych z wykorzystaniem różnych rodzajów polimerów: hydroksyetylocelulozy (HEC), Carbopolu 980 oraz alginianu sodu. Przygotowane hydrożele oceniano mikroskopowo, poprzez pomiary pH i lepkości oraz na podstawie analizy ich właściwości mechanicznych. Ponadto przeprowadzono badanie bioadhezji ex vivo z wykorzystaniem skóry bezwłosych myszy jako modelu warstwy adhezyjnej. Hydrożele z siarką na bazie alginianu sodu charakteryzowały się najlepszymi właściwościami aplikacyjnymi i były trwałe podczas 90 dni przechowywania w różnych warunkach temperatury i wilgotności.
Źródło:
Polimery; 2019, 64, 3; 208-215
0032-2725
Pojawia się w:
Polimery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Encapsulation of halloysite with sodium alginate and application in the adsorption of copper from rainwater
Kapsułkowanie haloizytu alginianem sodu i zastosowanie w adsorpcji miedzi z wody opadowej
Autorzy:
Marszałek, Anna
Powiązania:
https://bibliotekanauki.pl/articles/2173785.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
copper
adsorption
sodium alginate
rainwater
halloysite
miedź
adsorpcja
alginian sodu
woda deszczowa
haloizyt
Opis:
As part of the work, experiments were carried out on a laboratory scale to assess the effectiveness of the use of composite capsules based on halloysite and sodium alginate for the adsorption of copper from rainwater. The halloysite was subjected to acid activation prior to the encapsulation process. The characteristics of the capsules obtained were determined by means of SEM surface imaging, nitrogen adsorption by the BET method and pHPZC measurement by the suspension method. Adsorption was studied using various operational parameters such as adsorbent dose, contact time, pH and concentration of copper ions in the rainwater. A high percentage of copper ions removal was demonstrated, i.e. 72% for halloysite (H), and 83% for activated halloysite (HA) for a dose of 2.0 g/L. Adsorption of Cu (II) was consistent with pseudo-second order kinetics. The adsorbents showed a high adsorption capacity at the level of 11.03 mg/g, determined by the Langmuir isotherm model. This model fit well with the experimental data.
W ramach pracy przeprowadzono eksperymenty w skali laboratoryjnej mające na celu ocenę efektywności wykorzystania kapsuł kompozytowych na bazie haloizytu i alginianu sodu do adsorpcji miedzi z wód opadowych. Haloizyt został poddany aktywacji kwasem przed procesem enkapsulacji. Charakterystykę otrzymanych kapsułek określono za pomocą obrazowania powierzchni SEM, adsorpcji azotu metodą BET oraz pomiaru pHPZC. Adsorpcję badano za pomocą różnych parametrów operacyjnych, takich jak dawka adsorbentu, czas kontaktu, pH i stężenie jonów miedzi w wodzie deszczowej. Wykazano wysoki procent usuwania jonów miedzi, tj. 72% dla haloizytu (H) i 83% dla haloizytu aktywowanego (HA) dla dawki 2,0 g/L. Adsorpcja Cu (II) była zgodna z kinetyką pseudo drugiego rzędu. Adsorbenty wykazywały wysoką zdolność adsorpcji na poziomie 11,03 mg/g, wyznaczoną za pomocą modelu izoterm Langmuira. Model ten dobrze pasował do danych eksperymentalnych. Stwierdzono, że kapsułki kompozytowe haloizytu i aktywowanego haloizytu mogą być stosowane jako wydajny i tani adsorbent do usuwania miedzi z wody.
Źródło:
Archives of Environmental Protection; 2022, 48, 1; 75--82
2083-4772
2083-4810
Pojawia się w:
Archives of Environmental Protection
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preparation of hydrogel beads based on sodium alginate and aqueous extract from pomegranate peel and its cyanobacteria removal performance
Autorzy:
Wang, H.
Zhang, L.
Powiązania:
https://bibliotekanauki.pl/articles/208301.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
cells cytology
efficiency
removal sodium
sodium alginate
water supply
cytologia komórek
wydajność
usuwanie sodu
alginian sodu
zaopatrzenie w wodę
Opis:
In recent years, harmful cyanobacterial blooms frequently occurred all over the world, causing great damage to ecosystems, fishery resources, and recreational facilities. Therefore, the removal of harmful cyanobacterial blooms is a crucial step for the maintenance of safe water supplies and for the safety of aquatic products. Hydrogel beads based on sodium alginate and an aqueous extract from pomegranate peel were prepared, and used for removing Microcystin aeruginosa. The removal efficiencies of hydrogel beads to M. aeruginosa and the factors affecting its removal from solutions (the ratio of material to solvent, the dosage of hydrogel beads, and the density of M. aeruginosa cells) were investigated. The optimum ratio of material to solvent, the dosage of hydrogel beads and the density of M. aeruginosa cells were 0.03 g/cm3, 100 g/dm3and less than 8.68×106 cells/cm3, respectively. When the density of M. aeruginosa cells was below 8.68×106 cells/cm3, the removal efficiency of cyanobacteria was above 99.21% at the dose of 100 g/dm3. The pomegranate peel and sodium alginate, as natural materials, were safe and innocuous, providing simple operation, low cost and high availability. Therefore, the hydrogel beads offer favorable characteristics in M. aeruginosa removal.
Źródło:
Environment Protection Engineering; 2018, 44, 2; 159-167
0324-8828
Pojawia się w:
Environment Protection Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of the Possibility of Using Edible Alginate Films as Colorimetric pH Indicators in Intelligent Food Packaging®
Ocena możliwości zastosowania jadalnych folii alginianowych jako kolorymetrycznych wskaźników pH w opakowaniach inteligentnych do żywności®
Autorzy:
Galus, Sabina
Podolska, Edyta
Powiązania:
https://bibliotekanauki.pl/articles/2051357.pdf
Data publikacji:
2021
Wydawca:
Wyższa Szkoła Menedżerska w Warszawie
Tematy:
edible films
sodium alginate
pH indicator
intelligent packaging
folie jadalne
alginian sodu
wskaźnik pH
opakowanie inteligentne
Opis:
The aim of the work presented in the article was to evaluate the possibility of using edible alginate films based on the infusions of hibiscus flowers, chokeberry and blackcurrant fruit pomace as colorimetric pH indicators in intelligent food packaging. The films were made from aqueous infusions by casting method. The color and its change under different pH from 2 to 12 were examined. The films showed a color change from purple to red in an acidic environment and to dark gray in an alkaline environment. The color change of the films prepared with the addition of infusions from chockeberry and blackcurrant pomace indicated the possibility of using them as colorimetric pH indicators, which needs more research.
Celem pracy przedstawionej w artykule była ocena możliwości zastosowania jadalnych folii alginianowych wytworzonych na bazie naparów z wytłoków z kwiatów hibiskusa, owoców aronii i czarnej porzeczki jako kalorymetrycznych wskaźników pH w opakowaniach inteligentnych do żywności. Folie wytworzono z wodnych naparów barwnych metodą wylewania. Zbadano barwę i jej zmianę pod wpływem pH od 2 do 12. Folie wykazywały zmianę barwy z fioletowej do czerwonej w środowisku kwaśnym oraz do ciemnoszarej w środowisku zasadowym. Zmiana barwy folii przygotowanych z dodatkiem naparów z wytłoków z aronii i czarnej porzeczki wskazała na możliwość zastosowania ich jako kolorymetrycznych wskaźni ków pH i celowość prowadzenia dalszych badań.
Źródło:
Postępy Techniki Przetwórstwa Spożywczego; 2021, 2; 62-70
0867-793X
2719-3691
Pojawia się w:
Postępy Techniki Przetwórstwa Spożywczego
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparative study on physicochemical properties of alpha-TCP / calcium sulphate dihydrate biomicroconcretes containing chitosan, sodium alginate or methylcellulose
Autorzy:
Czechowska, Joanna
Zima, Aneta
Ślósarczyk, Anna
Powiązania:
https://bibliotekanauki.pl/articles/307328.pdf
Data publikacji:
2020
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
alpha-tricalcium phosphate
calcium sulphate
chitosan
sodium alginate
methylcellulose
biomicroconcrete
siarczan wapnia
chitozan
alginian sodu
metyloceluloza
Opis:
Recently, the attention has been drawn to complex systems – biomicroconcretes composed of a bone cement matrix and resorbable granules or microspheres. This paper presents novel bone substitutes composed of α-tricalcium phosphate (α-TCP; cement matrix), calcium sulphate dihydrate granules (GCSD; aggregates in biomicroconcrete) and various polymers (chitosan, sodium alginate, methylcellulose) used for the improvement of material properties. The aim of this work was to study α-TCP-GCSD-polymer interactions and to compare the impact of organic additives on the physicochemical properties of biomicroconcretes. Methods: Scanning electron microscopy (SEM), mercury intrusion porosimetry (MIP), X-ray diffractometry (XRD) as well as universal testing machine (INSTRON), Gilmore apparatus and pH/ conduct-meter were used. Results: The chemical bonding between α-TCP matrix and CSD granules resulted in a compressive strength appropriate for low-load bearing applications (7–12 MPa) and clinically relevant setting times (8–33 min). Biomicroconcretes consisting of sodium alginate possessed the highest mechanical strength (12 ± 2 MPa). It has also been found that the dissolution-precipitation reactions of the α-TCP were retarded with the addition of chitosan and acetic acid. This effect was not observed in the case of methylcellulose and sodium alginate. Chemical stability and bioactivity of materials were demonstrated during in vitro studies in simulated body fluid. Conclusions: Materials containing calcium sulphate-based granules were surgically handy, possessed promising physicochemical properties and are supposed to ensure desired macroporosity as well as gradual resorption in vivo. It has been demonstrated that the presence of CSD granules and polymers influenced the physicochemical properties of composites.
Źródło:
Acta of Bioengineering and Biomechanics; 2020, 22, 1; 47-56
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optymalizacja procesu kapsułkowania osadów ściekowych
Optimization of sewage sludge capsulation process
Autorzy:
Kończak, B.
Powiązania:
https://bibliotekanauki.pl/articles/399794.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
hydrożele
alginian sodu
biopolimery
osady ściekowe
kapsulacja
otoczkowanie
hydrogels
sodium alginate
biopolymers
sewage sludge
capsulation
encapsulation
Opis:
W artykule przedstawiono badania dotyczące optymalizacji procesu kapsułkowania osadów ściekowych w nośniku hydrożelowym. Osady ściekowe pobrane zostały z komunalnej oczyszczalni ścieków. Celem badań było określenie optymalnego stężenia alginianu sodu i roztworu sieciującego oraz określenie wpływu stężenia tych reagentów na stabilność mechaniczną kapsułek. Stwierdzono, że roztwór alginianu sodu powinien mieć stężenie minimum 2%, dzięki czemu możliwe jest uzyskanie kapsułek osadów ściekowych o zadawalającej stabilności mechanicznej. Na proces kapsulacji i stabilność kapsułek nie miało wpływu stężenie roztworu sieciującego. Otoczkowanie kapsułek dodatkową ścianką z alginianu sodu wpływa na zwiększenie stabilności mechanicznej kapsułek.
The article presents the research on optimization of sewage sludge capsulation in the hydrogel carrier. Sewage sludge was derived from a municipal wastewater treatment plant. The aim of the research was to determine an optimum concentration of sodium alginate and the crosslinking solution. Another aim was to determine the influence of the reagent concentration on the mechanical stability of the obtained capsules. It was determined that the using of 2% sodium alginate results in obtaining capsules with desired mechanical stability. The crosslinking solution concentration has not been affected on the capsulation process. The encapsulation of sewage sludge capsules with additional wall of sodium alginate has been improved their mechanical stability.
Źródło:
Inżynieria Ekologiczna; 2017, 18, 3; 168-174
2081-139X
2392-0629
Pojawia się w:
Inżynieria Ekologiczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 17

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