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Wyświetlanie 1-15 z 77
Tytuł:
Herbal Extract-Induced Silver Nanoparticles for Antibacterial Cotton Fabric
Autorzy:
Rajput, Sanjeev Kumar
Singh, Mukesh Kumar
Shakyawar, Dinesh Babu
Powiązania:
https://bibliotekanauki.pl/articles/24200967.pdf
Data publikacji:
2023
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:
biosynthesis
nanoparticles
natural dye
antibacterial property
Opis:
Herbal extract-induced metallic nanoparticles have replaced the traditionally synthesized nanoparticles to achieve sustainability in antimicrobial textiles. Silver nanoparticles (NPs) were created by the bio-reducion of silver nitrate with eucalyptus corymbia leaf extract. The bi-lateral activities of herbal extract, like the reduction and capping of silver nanoparticles, have added new dimensions in the bactericidal sector. Silver nanoparticles were characterized by UV-visible spectroscopy, a particle size analyzer, Fourier transform infrared spectroscopy (FTIR), field emission scanning electron microscopy (FESEM), energy dispersive X-ray (EDX) and X-ray diffractometry. In this study these biosynthesized nanoparticles were applied on cotton fabric alone and along with chitosan by the pad-dry-cure method to create antibacterial clothing. Antibacterial efficiency was characterized using the colony counting method (serial dilution method). The treated fabric shows excellent antibacterial efficiency.
Źródło:
Fibres & Textiles in Eastern Europe; 2023, 31, 3; 22--29
1230-3666
2300-7354
Pojawia się w:
Fibres & Textiles in Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Overview of the plant-based synthesis of metal and metal oxide nanoparticles and their potential application in the formation of protective coatings
Przegląd opartych na surowcach roślinnych metod syntezy nanocząstek metali i tlenków metali oraz ich potencjalne zastosowanie do otrzymywania powłok ochronnych
Autorzy:
Duda, Alicja
Kopyciński, Bartosz
Powiązania:
https://bibliotekanauki.pl/articles/41157896.pdf
Data publikacji:
2023
Wydawca:
Wydawnictwo SIGMA-NOT
Tematy:
biosynthesis
nanomaterials
powder metallurgy
paints
varnishes
protective coatings
green chemistry
biosynteza
nanomateriały
metalurgia proszków
farby
lakiery
powłoki ochronne
zielona chemia
Opis:
Technologies for the production of nanomaterials have been developed for many years. Despite the remarkable achievements in this field, nanotechnologies contribute to serious environmental pollution. One of the interesting directions in the search for new, green solutions limiting their harmful impact on nature is the use of plant extracts as substrates in the techniques of synthesis of metal nanoparticles and metal oxides. This article briefly reviews the current state of knowledge on the preparation of metallic nanoparticles via green chemistry synthesis methods. The general mechanism of these processes is presented in an accessible way. In addition, current trends in the field of their use in the formulation of paints and varnishes with antifouling properties and as components of protective coatings preventing corrosion are discussed. A noteworthy way of using metallic nanoparticles in agriculture as a factor inhibiting the negative effects of salinity on the growth of crops was also mentioned. Despite the constantly growing number of scientific reports on these issues, this topic still requires a comprehensive discussion along with a detailed analysis of the synthesis processes. A comprehensive approach will certainly contribute to a better knowledge and understanding of this subject and the improvement of the quality of works devoted to the green synthesis of metallic nanoparticles.
Technologie wytwarzania nanomateriałów są rozwijane od wielu lat. Pomimo niezwykłych osiągnięć w tej dziedzinie nanotechnologie przyczyniają się do poważnego zanieczyszczenia środowiska. Jednym z interesujących kierunków poszukiwania nowych, zielonych rozwiązań ograniczających ich szkodliwy wpływ na przyrodę jest wykorzystanie ekstraktów roślinnych jako substratów w technikach syntezy nanocząstek metali i tlenków metali. W artykule dokonano krótkiego przeglądu obecnego stanu wiedzy na temat otrzymywania nanocząstek metalicznych z użyciem metod syntezy biologicznej. W przystępny sposób przedstawiono ogólny mechanizm przebiegu tych procesów. Omówiono ponadto aktualne trendy w zakresie ich wykorzystywania w recepturowaniu farb i lakierów o właściwościach przeciwporostowych oraz jako składników powłok ochronnych zapobiegających korozji. Zwrócono również uwagę na kwestię zastosowania nanocząstek metalicznych w charakterze związków hamujących negatywny wpływ zasolenia na wzrost roślin uprawnych. Pomimo stale rosnącej liczby doniesień naukowych dotyczących tych zagadnień wciąż wymagają one kompleksowego omówienia wraz ze szczegółową analizą przebiegu procesów syntezy. Całościowe ujęcie z pewnością przyczyni się do lepszego poznania i zrozumienia tej tematyki oraz publikowania prac o wysokiej jakości.
Źródło:
Ochrona przed Korozją; 2023, 7; 197-205
0473-7733
2449-9501
Pojawia się w:
Ochrona przed Korozją
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Properties, various functions and application of bacterial melanins – some properties and possible application of melanin produced by Azotobacter chroococcum
Autorzy:
Kozieł, Monika
Powiązania:
https://bibliotekanauki.pl/articles/2163439.pdf
Data publikacji:
2023-01-31
Wydawca:
Instytut Uprawy Nawożenia i Gleboznawstwa – Państwowy Instytut Badawczy
Tematy:
bacterial melanin
polyphenol oxidase
stress protection
biosynthesis
Azotobacter chroococcum
Opis:
Melanins are a group of macromolecular pigments formed as a result of oxidative polymerization of phenolic and indole compounds. They are considered the most common, heterogeneous, resistant and evolutionarily oldest pigments found in nature. Melanins occurrred very early in the evolution of various groups of organisms. They have already been found in dinosaur, bird and primitive cephalopod fossils. Today, melanins are found in every kingdom of living organisms and play an important role in the processes of reproduction, thermoregulation, chemoprotection and camouflage. In addition to the important functions they perform in organisms, they exhibit a different chemical structure and are characterized by a wide range of colors, from black-brown to yellow-red. Differences in chemical structure have become the criterion for dividing melanins into four groups, i.e. eumelanin, allomelanin, pheomelanin and neuromelanin. Production of melanins is characteristic for many microorganisms, including free-living Azotobacter bacteria. The genus Azotobacter comprises eight species and only Azotobacter bryophylli does not produce pigments. Azotobacter chroococcum, the most abundant in soils all over the world, produces a dark brown melanin pigment non-diffusible into the substrate. Melanins synthesized by this species of bacteria increased the growth of some plants and detoxification of soils and waters polluted with heavy metals. In addition, the method of obtaining melanin produced by A. chroococcum is simple and relatively cheap compared to the cost of obtaining synthetic melanins, which gives the opportunity to conduct further research on the use of this pigment in biotechnology and molecular biology. In work it was describe the physicochemical properties, various functions and possible applications of bacterial melanins in various industries. The publication also summarizes the current knowledge on some properties and the possibility of use in bioremediation of soils and waters contaminated with heavy metals melanins synthesized by Azotobacter chroococcum.
Źródło:
Polish Journal of Agronomy; 2022, 51; 46-54
2081-2787
Pojawia się w:
Polish Journal of Agronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
François Chapeville (1924–2020) – in memoriam
Francois Chapeville (1924–2020) – wspomnienie
Autorzy:
Legocki, Andrzej B.
Powiązania:
https://bibliotekanauki.pl/articles/2121470.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
François Chapeville (Franciszek Chrapkiewicz)
biochemistry
biosynthesis of proteins
adapter hypothesis
Jacques Monod Institute of Molecular Biology
Opis:
François Chapeville (Franciszek Chrapkiewicz), an outstanding Polish bioche- mist, spent his entire adult life in France. After graduating in veterinary and biochemistry there, he completed a postdoctoral fellowship at the Fritz Lipmann laboratory at Rockefeller University in New York. There, he conducted studies that proved that the genetic information encoded in DNA is deciphered in the process of protein biosynthesis via adapter tRNA molecules (adapter hypothesis). In the years 1979–1991 he was appointed director of Jacques Monod Institute of Molecular Biology at the University VII in Paris. He was a great promoter of Polish-French cooperation in the natural sciences. He passed away in Paris at the age of 96. He was buried in his hometown of Strzyżów in the Podkarpacie region.
Źródło:
Nauka; 2021, 3; 185-188
1231-8515
Pojawia się w:
Nauka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Genetic background of selected sesquiterpene lactones biosynthesis in Asteraceae. A review
Podłoże genetyczne biosyntezy wybranych laktonów seskwiterpenowych u Asteraceae. Praca przeglądowa
Autorzy:
Sozoniuk, M.
Powiązania:
https://bibliotekanauki.pl/articles/13925502.pdf
Data publikacji:
2021
Wydawca:
Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Tematy:
sesquiterpene lactone
biosynthesis patchway
transcription factor
Asteraceae
Źródło:
Agronomy Science; 2021, 76, 3; 49-60
2544-4476
2544-798X
Pojawia się w:
Agronomy Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnoflorine - a compound with anti-tumour activity
Autorzy:
Baran, M.
Miziak, P.
Bonio, M.
Powiązania:
https://bibliotekanauki.pl/articles/2097708.pdf
Data publikacji:
2020
Wydawca:
Instytut Medycyny Wsi
Tematy:
biosynthesis
alkaloids
antitumour activity
magnoflorin
Opis:
Introduction. Alkaloids are a large group of organic compounds of natural origin. One of the most popular alkaloids is magnoflorine. This compound is synthesized by plants from the Ranunculaceae, Menispermaceae and Magnoliaceae families. Magnoflorine has unique biological properties and a broad spectrum of physiotherapeutic activity. It has antibacterial, antifungal, antidiabetic, immunomodulating and anticancer properties. Objective.The aim of the study is to present magnoflorine as a compound with anti-cancer potential. Brief description of the state of knowledge. Magnoflorine is a compound belonging to the isoquinolone alkaloids. Metabolized by secondary metabolism it is most commonly collected in the roots, rhizomes, tubers and bark of plants. It can be isolated from all plant elements by chromatographic methods. Magnoflorine has a number of therapeutic properties, including anti-cancer. Magnoflorine has been shown to inhibit cell proliferation, migration and cause apoptosis. The possibility of using this compound in the treatment of breast and stomach cancer has been confirmed. Results. The combination of DOX with magnoflorine reduces the expression of Bcl-2 and enhances the cleavage of caspase-9 and -3, causing apoptosis in breast cancer cells. Moreover, they block the activation of PI3K / AKT / mTOR signaling, which play an important role in regulating tumour growth. Magnoflorine inhibits the activity of caspases in liver cancer cells, resulting in inhibition of proliferation. Conclusion. Magnoflorine is an interesting research target due to its unique anticancer properties. Detailed knowledge of the pharmacological possibilities of magnoflorine will enable its effective use in the prevention and treatment of many civilization diseases.
Źródło:
Journal of Pre-Clinical and Clinical Research; 2020, 14, 3; 98-101
1898-2395
Pojawia się w:
Journal of Pre-Clinical and Clinical Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Occurrence and biosynthesis of melatonin and its exogenous effect on plants
Autorzy:
Mir, A.R.
Faizan, M.
Bajguz, A.
Sami, F.
Siddiqui, H.
Hayat, S.
Powiązania:
https://bibliotekanauki.pl/articles/2130592.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Botaniczne
Tematy:
antioxidant
abiotic stress
biosynthesis
melatonin
regulation
signaling
Opis:
Melatonin is an endogenous indolamine found in many plants. It has been shown to generate a wide range of metabolic, physiological, and cellular responses, thus affecting growth and development, particularly under different environmental stresses. In the present review, we focus on its role in germination, growth and development, photosynthesis, senescence, and antioxidant activity in plants. Further, an effort has been made to discuss its occurrence, biosynthesis, and relationship with other phytohormones in plants. Moreover, melatonin-mediated signaling and its mechanisms of action under stress conditions in plants have been comprehensively discussed. Finally, its role under various abiotic stress conditions has also been discussed in this review.
Źródło:
Acta Societatis Botanicorum Poloniae; 2020, 89, 2
0001-6977
2083-9480
Pojawia się w:
Acta Societatis Botanicorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Green synthesis of zinc oxide nanoparticles from aqueous extracts of Sesamum indicum L. and their characterization
Autorzy:
Manokari, M.
Latha, R.
Priyadharshini, S.
Cokul, Raj M.
Beniwal, Puneet
Shekhawat, M. S.
Powiązania:
https://bibliotekanauki.pl/articles/1077277.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Biosynthesis
Characterization
Plant Extracts
Sesamum indicum
Zinc Oxide Nanoparticles
Opis:
Green synthesis of Zinc oxide nanoparticles (ZnO-NPs) is a novel and non-toxic method as compared to the hazardous conventional physical and chemical methods. Herein, we report production of ZnO-NPs for the first time using whole vegetative parts of Sesamum indicum L. The aqueous extracts of various parts of S. indicum were used to synthesize nanoparticles in this study. The synthesized nanoparticles were evaluated using UV-visible spectroscopy for confirmation and characterization. The maximum UV-visible spectral absorption peaks were observed from 293 to 296 nm wavelengths. Leaf and stem reaction mixtures exhibited the sharpest absorption peaks of all the variations at 293 nm and root at 296 nm. This study leads to the development of cost-effective ZnO-NPs synthesis with possible further exploration to serve mankind.
Źródło:
World News of Natural Sciences; 2019, 23; 200-210
2543-5426
Pojawia się w:
World News of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Different Plants Extracts on Silver Nanopar ticles Green Synthesis
Autorzy:
Velgosova, O.
Mražíková, A.
Veselovský, L.
Willner, J.
Fornalczyk, A.
Powiązania:
https://bibliotekanauki.pl/articles/351682.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
nanoparticles
silver
biosynthesis
reduction agents
TEM
Opis:
Three plants extracts were used for biosynthesis of Ag nanoparticles (AgNPs). AgNPs nucleation process requires effective reduction agents which secure Ag+ to Ag0 reduction and also stabilizing/capping agents. The UV-vis and TEM observation revealed that the best results were obtained by R. officinalis leaf extract. The strong SPR band peak appeared at the wavelength 418 nm. Synthetized AgNPs were globular, fine (~20 nm), uniform and stabile throughout the experiment. A rapid rate of AgNPs synthesis was also significant and economically advantageous factor. Fine (10-20 nm) and globular nanoparticles were synthetized also by U. dioica leaf extract, but the stability of nanoparticles was not permanent. Despite V. vitis-idaea fruit extract contains a lot of reducing agents, UV-vis did not confirm the presence of AgNPs in solution. Synthetized Ag particles were very unstable, Ag particles agglomerated very fast and clearly indicated sediment was formed.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 2; 665-670
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimizing the biosynthesis of renewable polyhydroxyalkanoate copolymer containing 3-hydroxyvalerate by Massilia haematophila using statistical modeling
Autorzy:
Kiun, J.T.
Amelia, T.S.M.
Huong, K.H.
Amirul, A.A.
Bhubalan, K.
Powiązania:
https://bibliotekanauki.pl/articles/80806.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
polyhydroxyalkanoate
copolymer
Massilia haematophila
3-hydroxyvalerate
optimization
biosynthesis
statistical modelling
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:
Zinc Oxide nanoparticles synthesis by use of aqueous extracts of Muntingia calabura L.
Autorzy:
Manokari, M.
Shekhawat, Mahipal S.
Powiązania:
https://bibliotekanauki.pl/articles/1077767.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Biosynthesis
Muntingia calabura
Zinc oxide nanoparticles
optical properties
Opis:
Biological synthesis of metal nanoparticles gained worldwide interest due to their rapid, non-toxic, economical, single-step technique and eco-friendly alternative. Green-chemical approach of production of Zinc Oxide (ZnO) nanoparticles (NPs) has been exploited in the field of medicine, food packaging, nano-optical and electrical devices. Muntingia calabura is a multipotent medicinal plant with astounded biological activities and phytoconstituents. The nanoparticles obtained using aqueous extracts of various parts of M. calabura were characterized with UV-VIS spectroscopy to obtain information concerning the optical properties of synthesized ZnO nanoparticles. The proposed green and economical method could be used for large scale production of nanostructures because of its advantages over other physical and chemical methods.
Źródło:
World News of Natural Sciences; 2019, 22; 31-40
2543-5426
Pojawia się w:
World News of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pattern of carbohydrate changes in maturing xylem and phloem during growth to dormancy transition phase in Picea abies (L.) Karst.
Autorzy:
Traversari, S.
Emiliani, G.
Traversi, M.L.
Anichini, M.
Giovannelli, A.
Powiązania:
https://bibliotekanauki.pl/articles/2078285.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
Cell wall biosynthesis
latewood
starch
sugars
wood formation
wood quality
Opis:
Wood production is a metabolic process requiring high amount of soluble carbohydrates as source of carbon skeletons, energy, or signalling molecules. Nevertheless, the role of soluble sugars and starch has been rarely investigated in the growth to dormancy transition phase. The aim of this work was to investigate the carbohydrate concentrations and the transcription level of some candidate genes involved in cellulose and starch metabolisms in competitive carbon sinks such as phloem, maturing xylem, and xylem during the active growth to dormancy transition phase in Picea abies (L.) Karst. Stems were sampled every two weeks between July and October from potted eight-year-old Norway spruce plants. Results highlight that the cel- lulose biosynthesis regulated the pattern of carbohydrate changes in the phloem and maturing xylem during the transition to dormancy. In particular, the cessation of CesA (α-cellulose synthase) mRNA accumulation in maturing xylem determined a shift in the carbohydrate partitioning from the utilization sinks to the storage compartment. The content of carbohydrates was modulated in the maturing xylem by cellulose metabolism during the xylogenesis and by starch metabolism during the cambium dormancy. On the contrary, the carbon competition between utilization and storage sinks seemed to be less connected within the phloem. Since the amount of soluble carbohydrates within the maturing xylem and phloem has never been limited during the growth to dormancy transition phase, the cessation of the CesA transcription was probably determined by environmental conditions rather than by carbon limitation or sink competition.
Źródło:
Dendrobiology; 2018, 80; 12-23
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Influence of Agroclimatic Factors on the Formation of Oil Content in Flax Seeds in the North of Kazakhstan
Autorzy:
Gordeyeva, Y.
Shestakova, N.
Powiązania:
https://bibliotekanauki.pl/articles/123448.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
oil flax
fat biosynthesis
genotype
plasticity
stability
climatic parameters
Opis:
Flax (Linum usitatissimum L.) is one of the promising oil crops in the north of Kazakhstan. Over the last 10 years, the total area under this crop in the region has increased fourteen-fold, since flax is a very plastic crop for steppe and dry steppe conditions, and oil seeds are in high demand in the world market. Flaxseed oil, due to the content of polyunsaturated fatty acids, occupies one of the first positions among other edible vegetable oils. Depending on the environmental conditions, the oil content of the crop may vary from 36.4% to 52.0%, while, as noted by many researchers, the change in the oil content depends on the genotypic characteristics. Therefore, the study aims to analyze the influence of the genotype and climatic conditions of cultivation on the fat biosynthesis in flax seeds in the context of the dry steppe zone of Northern Kazakhstan on dark chestnut soils of the Akmola region. Field experiments were conducted in 2015–2017 with the study of nine oil flaxseed cultivars (of mid-season varieties) sown on May 20th at the seeding rate of 7 million seeds/ha based on the traditional technology of cultivation recommended for the region. The climatic parameters were taken into account according to the meteorological service data. The fat content was determined by the extraction method using a Soxhlet apparatus, in accordance with GOST (All-Union State Standard) 10857–64, and the moisture content was determined by means of the thermogravimetric method, according to the National Standard of the Republic of Kazakhstan 2.195–2010, for the recalculation of the oil content for absolutely dry matter. It was found that the formation of oil depends on the climatic parameters and on the sum of active temperatures during the ripening period, in particular. The evaluation of plasticity and stability of the cultivars (genotypes) showed that VNIIMK 620, Lirina, Karabalyksky 7 can be considered highly valuable cultivars and Severny, Biryuza, Kazar, Ilyich – valuable cultivars in terms of the oil content for the dry steppe zone.
Źródło:
Journal of Ecological Engineering; 2018, 19, 3; 102-105
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bioconversion of novel and renewable agro-industry by-products into a biodegradable poly(3-hydroxybutyrate) by marine Bacillus megaterium UMTKB-1 strain
Autorzy:
Yatim, A.F.M.
Syafiq, I.M.
Huong, K.H.
Amirul, A.-A.A.
Effendy, A.W.M.
Bhubalan, K.
Powiązania:
https://bibliotekanauki.pl/articles/81142.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Bacillus megaterium
polyhydroxyalkanoate
poly[3]hydroxybutyrate
biodegradability
agro-food industry
biosynthesis
bioconversion
gas chromatography
marine sponge
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2017, 98, 2
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of sucrose concentration on oxalic acid biosynthesis by Aspergillus niger
Wpływ stężenia sacharozy jako źródła węgla w procesie biosyntezy kwasu szczawiowego przez Aspergillus niger
Autorzy:
Walaszczyk, E.
Gasiorek, E.
Podgorski, W.
Powiązania:
https://bibliotekanauki.pl/articles/805954.pdf
Data publikacji:
2017
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
oxalic acid
biosynthesis
Aspergillus niger
sucrose concentration
carbon source
Opis:
The aim of the work was to determine the influence of initial sucrose concentration in fermentation medium on oxalic acid synthesis by Aspergillus niger W78C in submerged batch culture. Cultivations were conducted in synthetic medium containing sucrose in the concentration of 100, 125, 150, 175 or 200 g·dm⁻³. As the result of the present investigation, the optimal sucrose concentration was found at the level of 125 g·dm⁻³. In medium containing this amount of carbon source, 70.2 g·dm⁻³ of oxalic acid was obtained. When substrate concentration was the highest, 200 g dm⁻³, the amount of product was only 5.2 g·dm⁻³ higher than in medium with 125 g·dm⁻³ of sucrose. Moreover, an increase of the initial sucrose concentration resulted in process time extension, an increase of citric and gluconic acids concentration and a decrease of productivity and oxalic acid yield.
Celem badań było określenie wpływu początkowego stężenia sacharozy, będącej jedynym źródłem węgla, na proces biosyntezy kwasu szczawiowego przez Aspergillus niger metodą wgłębnej hodowli okresowej. W badaniach stosowano szczep A. niger W78C. Hodowle prowadzono w podłożach syntetycznych zawierających sacharozę w stężeniu 100, 125, 150, 175 lub 200 g·dm⁻³. W podłożu o najniższym początkowym stężeniu sacharozy, tj. 100 g·dm⁻³, uzyskano najniższe stężenie kwasu szczawiowego, tj. 59,3 g·dm⁻³. Podwyższenie stężenia substratu do 125 g·dm⁻³ spowodowało zwiększenie ilości produktu do 70,8 g·dm⁻³, czyli o 19,1%. Dalszy wzrost stężenia cukru w podłożu nie był już tak skuteczny, gdyż w wariancie z najwyższym początkowym stężeniem sacharozy, tj. 200 g·dm⁻³, uzyskano tylko o 5,2 g·dm⁻³ (czyli o 7,4%) więcej kwasu szczawiowego niż w podłożu, w którym ilość substratu była równa 125 g·dm⁻³. Wzrost początkowego stężenia substratu ze 100 do 200 g·dm⁻³ powodował wydłużenie czasu procesu, wzrost stężenia kwasów towarzyszących: cytrynowego i glukonowego, oraz spadek wydajności kwasu szczawiowego i szybkości jego tworzenia. Na podstawie uzyskanych stężeń produktu w podłożach z różnym początkowym stężeniem substratu oraz po analizie parametrów procesu (wydajności kwasu szczawiowego i objętościowej szybkości jego produkcji) uznano, że najkorzystniejsze stężenie sacharozy w tym procesie wynosi 125 g·dm⁻³.
Źródło:
Zeszyty Problemowe Postępów Nauk Rolniczych; 2017, 588
0084-5477
Pojawia się w:
Zeszyty Problemowe Postępów Nauk Rolniczych
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 77

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