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Tytuł:
Laccase Immobilization on Biopolymer Carriers – Preliminary Studies
Autorzy:
Deska, Małgorzata
Kończak, Beata
Powiązania:
https://bibliotekanauki.pl/articles/2086365.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
laccase
immobilization
biopolymer
biocatalysis
Opis:
This preliminary studies concerns preparation of biopolymer carriers for immobilization of laccase from Trametes versicolor, based on sodium alginate, chitosan and on a combined alginate-chitosan biopolymers as well as the evaluation of their potential use in the decolourization process. The study is related to the assessment the using of various carriers in the immobilization methods of laccase. The dropping method using sodium alginate (2%) proved to be the most effective technique of enzyme immobilization. The study showed an improvement in the stability of immobilized laccases under the conditions of variable pH, relative to a free laccase. A loss in the stability of enzymes in alginate beads occurs at high temperatures, together with enzyme leaching and degradation. Enzyme leaching from the beads inhibits their preliminary low-temperature drying. Immobilization and drying of obtained capsules constitutes a promising method for improving enzyme stability. The results obtained as part of this study offer a valuable contribution to the future research on the possibility of using the prepared alginate beads to remove colour contamination from wastewater.
Źródło:
Journal of Ecological Engineering; 2022, 23, 4; 235--249
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimal conditions for levan biopolymer production and its use in the synthesis of bactericidal levan-ZnO nanocomposite
Autorzy:
Taran, M.
Lotfi, M.
Safaei, M.
Powiązania:
https://bibliotekanauki.pl/articles/80561.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
biopolymer
levan biopolymer
zinc oxide
nanocomposite
Taguchi method
antibacterial activity
Zymomonas mobilis
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2019, 100, 4
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Collagen and Keratin as a Components of Hydrogels
Autorzy:
Wieczorek, Dorota
Słubik, Anna
Masłowska-Lipowicz, Iwona
Gendaszewska, Dorota
Ławińska, Katarzyna
Powiązania:
https://bibliotekanauki.pl/articles/2171998.pdf
Data publikacji:
2022
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:
biopolymer
collagen
keratin
smart hydrogel
application
Opis:
Smart hydrogels, or stimuli-responsive hydrogels, can and should play an important role as excellent drug carriers. These three-dimensional structure materials are composed of crosslinked hydrophilic polymer chains that are able to dramatically change their volume and other properties in response to environmental stimuli, such as pH, temperature and solvent changes. The main goal of individual research projects was the development of new hydrogels based on polypeptides. These hybrid materials are crosslinked hydrophilic polymers capable of absorbing large amounts of water, saline or physiological solutions. Superabsorbent hydrogels based on natural materials are non-toxic, biocompatible and biodegradable. Unfortunately, their mechanical properties in the swollen state are weak. In this article, we present a review of literature on the synthesis of smart hydrogels based on keratin or collagen with synthetic materials.
Źródło:
Fibres & Textiles in Eastern Europe; 2022, 3 (151); 61--69
1230-3666
2300-7354
Pojawia się w:
Fibres & Textiles in Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Biopolymers in wood-based materials – a recent review
Autorzy:
Gumowska, Aneta
Kowaluk, Grzegorz
Powiązania:
https://bibliotekanauki.pl/articles/2200181.pdf
Data publikacji:
2020
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
biopolymer
wood
composite
polylactic
polyhydroxybutyrate
polycaprolactone
Opis:
Biopolymers in wood-based materials – a recent review. The aim of the paper was to summarize the current state-of-art in the field of biopolymers application in the composites based on lignocellulosic raw materials. The cited literature show, in research and experiments, how promising the green composites market becomes. Biocomposites are becoming more interesting and promising alternative to commonly used petropolymers, which have a negative impact on health and the environment.
Biopolimery w materiałach drewnopochodnych – najnowszy przegląd. Celem pracy było podsumowanie aktualnego stanu wiedzy w zakresie zastosowania biopolimerów w kompozytach opartych na surowcach lignocelulozowych. Cytowana literatura pokazuje, w badaniach i eksperymentach, jak obiecujący staje się rynek „zielonych kompozytów”. Biokompozyty stają się ciekawszą i obiecującą alternatywą dla powszechnie stosowanych petropolimerów, które mają negatywny wpływ na zdrowie i środowisko.
Źródło:
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology; 2020, 110; 25--34
1898-5912
Pojawia się w:
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of the Fermentation Conditions of the Bacillus Cereus Strain ARY73 to Produce Polyhydroxyalkanoate (PHA) from Glucose
Autorzy:
Yasin, Akram R.
Al-Mayaly, Ithar K.
Powiązania:
https://bibliotekanauki.pl/articles/1955469.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
polyhydroxyalkanoates
PHA
Bacillus cereus
biopolymer
glucose
Opis:
Polyhydroxyalkanoates (PHAs) have gained much attention as biodegradable polymers, many efforts are being made to minimize the cost of PHAs by finding cheap carbon source depending on the type of microorganism and fermentation conditions. The aims of this study were to evaluate the effects of different glucose concentrations and other important conditions on the PHA production by Bacillus cereus isolated from soil. Polyhydroxyalkanoates PHAs accumulated by soil microorganisms were examined by screening the isolated bacteria using Sudan B Black and Nile Blue staining process. A Gram positive strain was identified using the 16s rRNA gene, deposited in the NCBI GenBank sequence database. Different growth conditions (favorite glucose concentrations 1-8 % (w/v), temperatures and pH) were tested and the growth parameters (sugar consumption, cell counting and Cell Dry Weight CDW) were studied. The extracted polymers were analyzed and characterized using an FTIR spectrophotometer followed by a GC-MS analysis. The pure bacterial strain isolated from soil was deposited in the NCBI GenBank database B. cereus strain ARY73, which showed significant black colored granules (or dark blue) using Sudan B Black stain, it also showed positive to Nile blue A as a high indicator stain for PHA accumulation. B. cereus ARY73 showed high production of PHA using (w/v): 2% glucose and 1% nitrogen source at 35 °C and pH7 yields 79% per Cell Dry Weight and 96 h of incubation. The extracted polymers were analyzed and characterized using an FTIR spectrophotometer confirming the PHA structure. The FTIR spectrophotometer, followed by a GC-MS analysis indicated the Scl-co-mcl PHA structure. This research demonstrates that the isolated strain B. cereus ARY73 was a good candidate for PHA production with a better quality for use in biomedical and other applications. The use of biopolymer in soil, enhanced the accumulation of the microorganisms (such as bacteria) capable of degrading biopolymer or biodegradation by-products yields by other species which were isolated in this study and demonstrated their efficiency in producing biopolymers.
Źródło:
Journal of Ecological Engineering; 2021, 22, 8; 41-53
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Biopolymer compositions for ecological protection and growth stimulation of plants
Autorzy:
Niekraszewicz, Antoni
Wiśniewska-Wrona, Maria
Kopania, Ewa
Orlikowski, Leszek
Pospieszny, Henryk
Krawczyk, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/1035390.pdf
Data publikacji:
2012
Wydawca:
Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
Tematy:
biopolymer compositions
growth stimulation.
plant protection
polysaccharides
Opis:
Presented herein are investigations in the preparation of an advanced , human-and environmentfriendly plant protection composition based on selected bioactive biopolymers of the polysaccharide family. In the Institute of Biopolymers and Chemical Fibres the biopolymers were prepared and the biological activity of chitosan in the form of salt and gel and of hemicelluloses (galactoglucomannans) and of their compositions was tentatively evaluated by way of plate tests. Estimated was the impact of such preparations upon the stimulation of the germination rate of radish seeds at concentration of 0.1, 0.01 and 0.005% after 72 hours. The efficacy of the preparations was evaluated based on the number of germinated seeds in the green mass of the sprouts and their length in comparison to a reference in water at pH = 7.0. In Research Institute of Horticulture, Skierniewice, Poland the usefulness of selected iopolymer preparations was evaluated as agents to protect decorative plants against some pathogens (on leaves, in soil) such as Phytophtora cryptogea causing decay of shoots and roots. It could be found that the biopolymer compositions applied to the soil provided a much better rooting of chrysanthemum cuttings in a Phytophtora cryptogea - infected soil. The cuttings were growing much faster and the number of infected ones was largely reduced. The usefulness of a number of chitosan formulations was also evaluated for seed pickling. It was found that the formulations exerted a distinctly positive impact upon the germination, growth and health of the seedlings. Laboratory and greenhouse testing was made in the Institute of Plant Protection, Poznań, Poland where the biological activity of some biopolymer compositions was evaluated. A first selection of the biopolymers was done based on an in vitro examination of the impact upon bacteria growth. (Gram negative - Erwinia amylovora and Gram positive Clavibacter ichiganensis ) on agar or agarose plates and upon the generation of necrotic stains on beans and tobacco caused by lucerne mosaic virus and tobacco mosaic virus respectively. It was found that the preparations with original biopolymer concentration had not affected the viruses directly but stimulated the plants’ immunity against the pathogens.
Źródło:
Progress on Chemistry and Application of Chitin and its Derivatives; 2012, 17; 149-162
1896-5644
Pojawia się w:
Progress on Chemistry and Application of Chitin and its Derivatives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of pH value on effectiveness of biopolymer-based treatment of bauxite mine slurry
Autorzy:
Meng, Jian Ping
Li, Shanmei
Yan, Rongtao
Wei, Changfu
Powiązania:
https://bibliotekanauki.pl/articles/24085778.pdf
Data publikacji:
2023
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
pH
biopolymer
xanthan gum
bauxite mine slurry
flocculation
Opis:
Effective dehydration and flocculation of mine slurries or sludge is important for nonferrous metal industries and environmental engineering. However, the mechanisms for the flocculation of slurry remain largely unclear. This paper presents the results of a series of flocculation tests, which was conducted on the slurry suspensions treated by xanthan gum (flocculant) at different pH values. It is shown that the settlement rate of mine slurry particles can be accelerated by adding xanthan gum, and the maximum sedimentation rate was obtained at a pH value of 5.9, and the final volume of flocs is significantly increased due to the addition of the flocculant. In addition, the settlement rates of xanthan gum-treated slurry suspensions at the pH values of 3, 5 and 7 decrease slightly compared with the reference slurry suspensions with pH=5.9, and the slurries remained stable as suspensions at the pH value of 9 and 11. The zeta potential measurement and SEM image analysis show that flocculation occurs primarily due to electrostatic attraction between slurry particles and the flocculants, and the bridging effect between the carboxylic groups in the side chains of xanthan gum molecule and the suspension particles.
Źródło:
Physicochemical Problems of Mineral Processing; 2023, 59, 3; art. no. 167949
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Environmental Impact on Biodegradation Speed and Biodegradability of Polyethylene and Zea Mays Starch Blends
Autorzy:
Abioye, Abiodun A.
Oluwadare, Oreofe P.
Abioye, Oluwabunmi P.
Obuekwe, Chukwunonso C.
Afolalu, Adeniran S.
Atanda, Pethuel O.
Fajobi, Muyiwa A.
Powiązania:
https://bibliotekanauki.pl/articles/123808.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
biodegradable
biodegradation rate
biopolymer
loamy sand
Zea mays
Opis:
Several studies projected that by year 2025, 4.3 billion urban residents will be generating about 2.2 billion tonnes of municipal solid waste per year, over 10% of which will be plastics. The landfills in Nigeria are uncontrolled and do not conform to the international standards of similar operations elsewhere in the world; this makes the disposal of synthetic polymers in the soil even more hazardous. Due to the availability and relative inexpensiveness of Zea mays in Nigeria, this study explores the use of this natural polymer, blended with low density polyethylene (LDPE) as an alternative to synthetic plastics. Biodegradability of the biopolymer blend was observed while buried in loamy sand soil with properties similar to the soil found in the general area of the study. The results showed that a polymer blend with 50% LDPE (50 CoS) by weight had the most uniform weight loss over the period of the study. Under the soil conditions given in the study, 50 CoS also had the steadiest rate of degradation. Hence 50% LDPE (wt.%) blended with Zea mays starch is the optimal ratio with regard to the degradability of biopolymer in loamy sand soil Ota, Ogun State, Nigeria.
Źródło:
Journal of Ecological Engineering; 2019, 20, 9; 277-284
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The quality of the wood bonding depending on the method of applying the selected thermoplastic biopolymers
Autorzy:
Gumowska, Aneta
Kowaluk, Grzegorz
Powiązania:
https://bibliotekanauki.pl/articles/2166514.pdf
Data publikacji:
2021
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
biopolymer
polylactic
polycaprolactone
bonding line
shear strength
density profile
Opis:
The quality of the wood bonding depending on the method of applying the selected thermoplastic biopolymers. The aim of the research was to determine the effect of the method of applying the biopolymer on the surface of bonding solid wood elements on the quality of the obtained adhesive connection. The results of conducted mechanical research show that the highest average value of shear strength was observed for birch lamellas bonded with PLA, both with the first and second method of application. In case of estimating the quality of the bonding of wooden elements, better results were achieved for PLA and the second method of application the "green" adhesive.
Źródło:
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology; 2021, 116; 78--85
1898-5912
Pojawia się w:
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Galactoglucomannans (GGMs) Extracted from Spruce Sawdust for Medical Applications
Galaktoglukomannany (GGM) wyodrębnione z trocin drewna świerkowego do zastosowań medycznych
Autorzy:
Kopania, E.
Wiśniewska-Wrona, M.
Wietecha, J.
Powiązania:
https://bibliotekanauki.pl/articles/231853.pdf
Data publikacji:
2014
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:
softwood
galactoglucomannans microcrystalline chitosan
thermal treatment
enzymatic treatment
biopolymer composities
trociny drewna świerkowego
galactoglucomannans mikrokrystaliczna chitozan
obróbka cieplna
obróbka enzymatyczna
kompozyty BioPolymer
Opis:
The article presents a method of extracting galactoglucomannas (GGMs) from softwood (spruce). GGMs were extracted using thermal and enzymatic treatment in an aqueous environment. The GGMs extracted, depending on the extraction method, were characterized by different compositions of simple carbohydrates i. e. glucose, galactose and mannose, as well as by the average molecular weight. Evaluation of the composition of GGMs obtained was performed using GC/MS and SEC. The biopolymer composites obtained by combining GGMs with microcrystalline chitosan (MCCh), showed suitability for constructing dressing materials in the form of sponges. The studies were performed in order to evaluate antibacterial properities of composite realtive to Escherichia coli standard Gram (-) and their susceptibility to enzymatic and hydrolytic degradation. The research confirmed the usefulness of MCCh/GGMs composities for constructing dressing materials.
W artykule przedstawiono metodę wyodrębniania galaktoglukomannanów (GGM) ze świerkowych trocin drzewnych, z zastosowaniem obróbki termicznej i enzymatycznej prowadzonej w środowisku wodnym. Wyodrębnione GGM (w zależności od metody wyodrębniania) charakteryzowały się zróżnicowanym składem pod względem zawartości poszczególnych cukrów prostych tj. glukozy, galaktozy i mannozy oraz wartością średniej masy cząsteczkowej. Ocenę składu i zmian strukturalnych otrzymanych GGM prowadzono z wykorzystaniem chromatografii GC/MS, SEC. Wytworzone biopolimerowe kompozyty, uzyskane w wyniku połączenia GGM z mikrokrystalicznym chitozanem (MKCh), wykazały przydatność do konstrukcji materiałów opatrunkowych w postaci gąbki. Oceniono działanie przeciwbakteryjne wytworzonych biokompozytów wobec wzorcowej bakterii Escherichia coli Gram (-) oraz ich podatność na degradację hydrolityczną i enzymatyczną. Przeprowadzone badania potwierdziły przydatność GGM do wytwarzania kompozytów z MKCh, stanowiących podstawowy składnik konstrukcyjny materiałów opatrunkowych.
Źródło:
Fibres & Textiles in Eastern Europe; 2014, 2 (104); 29-34
1230-3666
2300-7354
Pojawia się w:
Fibres & Textiles in Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A pH-responsive biopolymer-based multiple emulsion prepared in a helicoidal contactor for chemotherapeutics delivery
Emulsje wielokrotne z pH-czułym biopolimerem wytwarzane w kontaktorze helikoidalnym do dostarczania chemoterapeutyków
Autorzy:
Dluska, Ewa
Markowska-Radomska, Agnieszka
Skowronski, Patryk
Powiązania:
https://bibliotekanauki.pl/articles/2202616.pdf
Data publikacji:
2022
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Chemii Przemysłowej
Tematy:
pH-responsive biopolymer
multiple emulsions
helicoidal contactor
release process
biopolymer adsorption
pH-czuły biopolimer
emulsje wielokrotne
kontaktor helikoidalny
proces uwalniania
adsorpcja biopolimeru
Opis:
Among biopolymers, pH-responsive ones have much potential for drug delivery systems by exploiting the pH gradient between physiological and pathological states. In this paper multiple emulsions with a pH-responsive biopolymer for controlled drug delivery in brain tumor treatment were discussed. The characteristic and rheological properties of multiple emulsions, biopolymer adsorption, zeta potential, and release processes were examined. The results showed higher drug release rates in the acidic tumor microenvironment compared to the simulated conditions of normal cells.
Wśród biopolimerów, te reagujące na pH wykazują duży potencjał w systemach dostarczania leków dzięki wykorzystaniu gradientu pH między stanami fizjologicznymi i patologicznymi. W pracy omówiono emulsje wielokrotne z biopolimerem reagującym na zmiany pH, do kontrolowanego dostarczania leków w terapii guza mózgu. Zbadano charkterystykę i krzywe reologiczne emulsji, adsorpcję polimeru na kroplach, zeta potencjał i proces uwalniania. Wyniki wykazały wyższe szybkości uwalniania leku w kwaśnym mikrośrodowisku guza w porównaniu z symulowanymi warunkami normalnych komórek.
Źródło:
Polimery; 2022, 67, 7-8; 346--354
0032-2725
Pojawia się w:
Polimery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synteza, oczyszczanie i charakterystyka bioflokulantów izolowanych ze szczepów bakteryjnych
Synthesis, purification and characterization of bioflocculants isolated from bacterial strains
Autorzy:
Czemierska, M.
Szcześ, A.
Kowalska, J.
Jarosz-Wilkołazka, A.
Powiązania:
https://bibliotekanauki.pl/articles/2073084.pdf
Data publikacji:
2015
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
bioflokulant
biopolimer
oczyszczanie
aktywność flokulacyjna
bioflocculant
biopolymer
purification
flocculating activity
Opis:
Badania obejmowały wstępne oczyszczanie bakteryjnych bioflokulantów oraz porównanie aktywności flokulacyjnej w obrębie analizowanych szczepów. Stwierdzono, że szczepy bakteryjne należące do Actinobacteria syntetyzują bioflokulanty o wysokiej aktywności flokulacyjnej, której nie tracą w wyniku oczyszczania. Wysoka aktywność wyizolowanych biopolimerów pozwoli na wydajne ich wykorzystanie w przemyśle i medycynie.
An appropriate purification method of bacterial bioflocculants was selected and flocculating activities of studied strains were compared. Studies showed that bacterial strains from Actinobacteria can synthesise bioflocculants with high flocculating activity which is very stable during purification process. The high activity of isolated biopolymers will enable their efficient application in industry and medicine.
Źródło:
Inżynieria i Aparatura Chemiczna; 2015, 3; 77--79
0368-0827
Pojawia się w:
Inżynieria i Aparatura Chemiczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of Taguchi method in the optimization of synthesis of cellulose-MgO bionanocomposite as antibacterial agent
Autorzy:
Safaei, Mohsen
Taran, Mojtaba
Imani, Mohammad Moslem
Moradpoor, Hedaiat
Rezaei, Farzad
Jamshidy, Ladan
Rezaei, Razieh
Powiązania:
https://bibliotekanauki.pl/articles/778461.pdf
Data publikacji:
2019
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
cellulose biopolymer
magnesium oxide nanoparticles
nanocomposite
antibacterial activity
Taguchi method
Opis:
In this study, optimal conditions to form cellulose-MgO nanocomposite with antibacterial properties were evaluated. Applying the Taguchi method, 9 experiments were designed and the effects of different concentrations of biopolymers cellulose (0.5, 1 and 2 mg/ml), MgO nanoparticles (2, 4 and 8 mg/ml) and stirring times (30, 60 and 90 min) on antibacterial activity of synthesized nanocomposites were assessed. The characterizations of products were investigated by dynamic light scattering (DLS), raman spectroscopy, scanning electron microscope (SEM), thermogravimetric analysis (TGA) and differential thermal analysis (DTA). The results showed that the nano-composite produced in the conditions of experiment 9 (MgO 8 mg/ml, cellulose 2 mg/ml and stirring time of 60 min) has the strongest antibacterial activity. The outcomes of both methods of colony forming units (CFU) and disc diffusion indicated that the antibacterial activity of cellulose-MgO nanocomposite was significantly higher than its components (P <0.05). Thermal analysis indicated improvement in the thermal stability of the cellulose biopolymer after the formation of the nanocomposite. Due to the improvement of the antibacterial properties of cellulose-MgO nanocomposite compared to its components, we can use it as a new antibacterial agent in the fields of pharmaceutical, medicine and dentistry.
Źródło:
Polish Journal of Chemical Technology; 2019, 21, 4; 116-122
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Biopolymer composites based on galactoglucomannans (ggms) and micrystaline chitosan (mcch)
Autorzy:
Kopania, Ewa
Wiśniewska-Wrona, Maria
Powiązania:
https://bibliotekanauki.pl/articles/1034988.pdf
Data publikacji:
2015
Wydawca:
Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
Tematy:
biopolymer composites
enzymatic treatment
galactoglucomannans
microcrystalline chitosan
spruce
thermal treatment
Opis:
The article presents a method of extracting galactoglucomannas (GGMs) from softwood (spruce). GGMs were extracted using thermal and enzymatic treatment in an aqueous environment. The extracted GGMs, depending on the extraction method, were characterized by different composition of simple carbohydrates i.e. glucose, galactose and mannose, as well as by the average molecular weight. Evaluation of the composition of GGMs obtained was performed using GC/MS and SEC. Biopolymer composites were obtained by combining GGMs and microcrystalline chitosan (MCCh), which can be used as preparations for plant protection and growth stimulation. The studies were performed in order to evaluate biological activity of composites based on Petri dish test in which their ability to stimulate seed germination of selected plants was estimated. The effect of plant growth stimulation depended on GGMs composition of simple carbohydrates. GC/MS and SEC chromatographic tests and 13C NMR analysis enabled to establish the composition and structural changes of the obtained GGMs and biocomposites
Źródło:
Progress on Chemistry and Application of Chitin and its Derivatives; 2015, 20; 110-121
1896-5644
Pojawia się w:
Progress on Chemistry and Application of Chitin and its Derivatives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical characteristics of Portulaca grandiflora-doped Cellulose using the spray pyrolysis technique
Autorzy:
Alaridhee, Tahseen
Obeed, Mohammed T.
Malk, Fatima H.
Dhahi, Baheya A.
Powiązania:
https://bibliotekanauki.pl/articles/27315701.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
Tematy:
green materials
optical properties
natural dye
biopolymer
spray pyrolysis technique
Opis:
Thin films were prepared based on cellulose polymer doped with different ratios of natural dye derived from Portulaca grandiflora concentrations. The polymer and natural dye were extracted from eco-friendly materials - the cell walls of millet husks and Portulaca grandiflora, respectively. The spray pyrolysis technique was applied to prepare thin film samples to control the film morphology and reduce the roughness of the surface. Optical microscope and Fourier transform infrared were used to analyse structural, morphological, and functional groups for all samples, respectively. The peak absorbance, extinction coefficient, optical bandgap, Urbach energy, and optical conductivity for the thin films were determined using ultraviolet-visible spectroscopy. The results show an enhancement in the optical characteristics when the natural cellulose is doped with a dye. Doping cellulose with 5% P. grandiflora has led to a considerable reduction in the energy bandgap (to 1.95 eV), compared to the sample doped with 1%.
Źródło:
Opto-Electronics Review; 2023, 31, 3; art. no. e146553
1230-3402
Pojawia się w:
Opto-Electronics Review
Dostawca treści:
Biblioteka Nauki
Artykuł
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