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Tytuł:
Synthesis and characterization of a citric and lipoic acids-derived dendrimer
Synteza i charakterystyka dendrymeru pochodzącego z kwasu cytrynowego i liponowego
Autorzy:
Salgado-Delgado, René
Salgado-Delgado, Areli M.
Olarte-Paredes, Alfredo
García-Fuentes, Juan J.
López-Lara, Teresa
Hernández-Zaragoza, Juan B.
García-Hernández, Edgar
Castaño, Víctor M.
Powiązania:
https://bibliotekanauki.pl/articles/2202634.pdf
Data publikacji:
2023
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Chemii Przemysłowej
Tematy:
dendrimer
citric acid
lipoic acid
dendrymer
kwas cytrynowy
kwas liponowy
Opis:
The paper describes the synthesis and characterization of two third generation dendrimers from citric acid and a variant with a dendron terminated with lipoic acid. FTIR and C NMR confirmed the presence of signals characteristic for the dendrimer functional groups OH, C-O, C=O, C-H and C-S. DSC showed that, unlike citric acid, the dendrimer is amorphous. SEM revealed changes in the structure of citric acid particles in each dendrimer generation. In addition, the structure was more homogeneous. Dendrimers are hydrophobic due to ester linkages. Contact angle > 90° confirms their hydrophobic char-acter. Moreover, the dendrimer with a dendron terminated with lipoic acid absorbs Cu+2 and Fe+3metal ions, so it can be used as an adsorbent for heavy metals.
W pracy opisano syntezę i charakterystykę dwóch dendrymerów trzeciej generacji z kwasu cytrynowego oraz wariantu z dendronem zakończonym kwasem liponowym. Metodą FTIR i C NMR potwierdzono sygnały charakterystyczne dla grup funkcyjnych dendrymeru OH, C-O, C=O, C-H i C-S. Metodą DSC wykazano, że w odróżnieniu od kwasu cytrynowego dendrymer jest amorficzny. Mikrofotografie SEM wykazały zmiany w strukturze cząstek kwasu cytrynowego w każdym pokoleniu dendrymeru. Ponadto struktura była bardziej jednorodna. Dzięki wiązaniom estrowym otrzymane dendrymery są hydrofobowe, co potwierdza kąt zwilżania > 90°. Wykazano również, że dendrymer z dendronem zakończonym kwasem liponowym absorbuje jony metali Cu+2 i Fe+3, dzięki czemu może być stosowany jako adsorbent metali ciężkich.
Źródło:
Polimery; 2023, 68, 1; 25--31
0032-2725
Pojawia się w:
Polimery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Herbicidal efficacy of some natural products and mulching compared to herbicides for weed control in onion fields
Autorzy:
El-Metwally, I.
Shalaby, S.
Powiązania:
https://bibliotekanauki.pl/articles/2084820.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
acetic acid
Allium cepa
citric acid
onion
rice straw
Opis:
In two field experiments, the effect of some weed control treatments (citric acid at the rate of 10, 15 and 20%, acetic acid at the rate of 20, 30 and 40%, oxadiargyl, oxyflurfen, rice straw mulch, hand hoeing and an unweeded check control treatment) on weed growth and onion productivity in sandy soils at the Agricultural Experimental Station of the National Research Centre, Egypt was studied. The results indicated that all weeded treatments reduced the dry weight of broadleaf, grassy and total weeds as compared with the weedy check. Oxadiargyl, followed by two hand hoeing, rice straw mulch and acetic acid 40% recorded the greatest weed control efficiency. Insignificant differences were noticed between these treatments. Applying rice straw mulch increased bulb length, bulb diameter, bulb weight and onion yield by 67.52, 57.55, 45.74 and 66.22% over the weedy check, respectively. The highest values of N, P and K were obtained from rice straw mulch treatment followed by hand hoeing, oxadiargyl and acetic acid 40% treatments. It may be concluded that farmers can certainly depend on mulching or acetic acid at 40% instead of using chemical herbicides especially in organic farm systems for controlling onion weeds.
Źródło:
Journal of Plant Protection Research; 2019, 59, 4; 479-486
1427-4345
Pojawia się w:
Journal of Plant Protection Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Phytoextraction of Cr by maize (Zea mays L.) : the role of plant growth promoting endophyte and citric acid under polluted soil
Autorzy:
Ali, J.
Mahmood, T.
Hayat, K.
Afridi, M. S.
Ali, F.
Chaudhary, H. J.
Powiązania:
https://bibliotekanauki.pl/articles/204568.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
maize
phytoextraction
chromium
citric acid
Burkholderia vietnamiensis
Opis:
High chromium (Cr) toxicity has turned into a serious environmental concern. Cr contaminated agronomic soils negatively affect the growth and yield of crops. Current research was conducted to enhance the phytoextraction potential of maize by using Burkholderia vietnamiensis and citric acid (CA). Plants were subjected to three concentrations of Cr (0.86, 350, and 500 ppm). A pot experiment was conducted under greenhouse conditions with completely randomized design (CRD). After 72 days of experiment, plants were harvested to analyze the morphological and biochemical attributes of soil, bacteria and plant. Results revealed that plant fresh, dry biomass, root, shoot length and chlorophyll contents significantly increased by 56%, 50%, 58%, 78% and 60%, respectively, at 500 ppm Cr concentration in combine treatment of B. vietnamiensis and CA. Maize plants treated with both B. vietnamiensis and CA significantly increased the bioaccumulation (BA) of Cr up to 50% and translocation factor (TF) by 31%. Furthermore, superoxide dismutase (SOD), proline and peroxidase dismutase (POD) activities in leaves were markedly increased by 30%, 42% and 15%, respectively, when treated with CA. Current study reveals that exogenous co-application of B. vietnamiensis + CA enhance plant growth by alleviating heavy metal stress and accelerate the phytoextraction of Cr. Taking into account the heavy metal tolerance and accumulation capacity, Zea mays is suitable for phytoremediation of contaminated soils in combination with B. vietnamiensis and CA.
Źródło:
Archives of Environmental Protection; 2018, 44, 2; 73-82
2083-4772
2083-4810
Pojawia się w:
Archives of Environmental Protection
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ nawożenia magnezem na zawartość kwasów organicznych i ciemnienie miąższu bulw ziemniaka odmiany Mila
Autorzy:
Wszelaczynska, E
Powiązania:
https://bibliotekanauki.pl/articles/47110.pdf
Data publikacji:
2004
Wydawca:
Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydawnictwo PB
Tematy:
kwas askorbinowy
kwas cytrynowy
ziemniaki Mila
ziemniaki
bulwy
ciemnienie miazszu
kwas chlorogenowy
zawartosc kwasow organicznych
nawozenie magnezem
ascorbic acid
citric acid
Mila cultivar
potato
tuber
pulp darkening
chlorogenic acid
organic acid content
nitrogen fertilization
Opis:
W latach 1995-1997 prowadzono dwuczynnikowe doświadczenie, którego celem było określenie: czy i w jakim stopniu nawożenie magnezem wpływa na zawartość kwasów organicznych i ciemnienie miąższu bulw ziemniaka bezpośrednio po uzyskaniu ich pełnej dojrzałości oraz po okresie jesienno-zimowego składowania. Badano jadalną odmianę ziemniaka Mila. Czynnikami doświadczenia były: 2 terminy oceny (po zbiorach i po 6 miesiącach przechowywania) oraz 5 poziomów nawożenia magnezem (15, 35, 50, 70, 85 kg MgO·ha-1) na tle stałego nawożenia azotem, fosforem i potasem. W doświadczeniu oznaczono stopień ciemnienia miąższu bulw surowych i ugotowanych oraz zawartość kwasów organicznych powodujących ciemnienie. Nawożenie magnezem ma istotny wpływ na zawartość kwasów organicznych w bulwach. Najkorzystniej na zawartość kwasów chlorogenowego i cytrynowego oddziałuje dawka 70 kg MgO·ha-1, a koncentracja kwasu askorbinowego jest największa po zastosowaniu 50 kg MgO·ha-1. Nawożenie magnezem zmniejsza ciemnienie miąższu bulw, co jest korzystne dla konsumentów.
Over 1995-1997 a two-factor experiment was carried out which aimed at defining whether and, if so, to what extent magnesium fertilisation affects the content of organic acids and potato tuber blackening right after reaching full maturity and after autumn- winter storage. ‘Mila’ table potato cultivar was researched. The experimental factors included: 2 evaluation dates (after harvest and after 6 months of storage) and 5 magnesium fertilisation rates (15, 35, 50, 70, 85 kg MgO·ha-1) against fixed nitrogen, phosphorus and potassium fertilisation. In the experiment the degree of raw and cooked tuber blackening was evaluated as well as the content of organic acids which cause blackening. Magnesium fertilisation shows a significant effect on the content of organic acids in tubers. The most favourable effect on the content of chlorogenic and citric acid was recorded for 70 kg MgO·ha-1, while a concentration of ascorbic acid was the highest for 50 kg MgO·ha-1. Magnesium fertilisation, to the satisfaction of consumers, decreases tuber blackening.
Źródło:
Acta Scientiarum Polonorum. Agricultura; 2004, 03, 1; 175-186
1644-0625
Pojawia się w:
Acta Scientiarum Polonorum. Agricultura
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synteza i analiza struktury kopolimerów kwasu mlekowego i kwasu cytrynowego
Synthesis and characterization of lactic acid – citric acid copolymers
Autorzy:
Florjańczyk, Z.
Chudzik, A.
Frydrych, A.
Rucińska, K.
Powiązania:
https://bibliotekanauki.pl/articles/1205311.pdf
Data publikacji:
2017
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Chemii Przemysłowej
Tematy:
kwas mlekowy
kwas cytrynowy
polimery rozgałęzione
polimery amfifilowe
lactic acid
citric acid
branched polymers
amphiphilic polymers
Opis:
Badano procesy kondensacji kwasów cytrynowego i mlekowego w stopie oraz metodą sprzęgania w obecności dicykloheksylokarbodiimidu. Otrzymane produkty analizowano za pomocą technik magnetycznego rezonansu jądrowego (1H NMR), spektroskopii mas (MALDI ToF) oraz chromatografii żelowej (GPC). Wykazano, że kondensacja w stopie prowadzi na ogół do skomplikowanej mieszaniny kopolimerów oraz homopolimerów kwasu mlekowego. Połączenie obu metod pozwala natomiast otrzymać, z wysoką wydajnością, kopolimery o budowie rozgałęzionej o wagowo średnich masach molowych 9–27 kg/mol i wartościach Mw/Mn = 1,3–2,0. Metodą sprzęgania uzyskano także amfifilowe kopolimery zawierające hydrofobowy rdzeń złożony z merów kwasów cytrynowego i mlekowego oraz hydrofilowe segmenty polioksyetylenowe. Produkty te tworzą w wodzie stabilne koloidalne dyspersje o średnicach cząstek rzędu 50–500 nm.
The processes of condensation of citric and lactic acids carried out in melt or by coupling in the presence of dicyclohexylcarbodiimide have been investigated. The obtained products were analyzed using 1H NMR, MALDI ToF and GPC techniques. It has been shown that the condensation in melt leads generally to acomplicated mixture of lactic acid copolymers and homopolymers. However, the combining of both methods allows to obtain in high yield the copolymers with branched structure, weight-average molar masses in the range 9–27 kg/mol and Mw/Mn values between 1.3 and 2.0. By using the coupling method, amphiphilic copolymers containing ahydrophobic core composed of citric and lactic acid monomeric units and hydrophilic polyoxyethylene segments were obtained as well. These products form stable colloidal aqueous dispersions with particle diameters ranging from 50 to 500 nm.
Źródło:
Polimery; 2017, 62, 5; 335-343
0032-2725
Pojawia się w:
Polimery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Citric Acid as an Eco-Friendly Inhibitor for the EN AW-2024 Aluminum Alloy Corrosion in Acidic Medium
Autorzy:
Kamarska, Kalina
Powiązania:
https://bibliotekanauki.pl/articles/2202340.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
corrosion inhibition
aluminum alloy
citric acid
electrochemical technique
Opis:
The paper presents the results from a study on the possibility to use citric acid as an ecological inhibitor of corrosion in aluminum alloy EN AW-2024 in 0.5 М solution of H2SO4. The study has been carried out by using electrochemical techniques, such as open circuit potential and chronoamperometry. The results reveal that the presence of citric acid in the studied acid medium reduces the corrosion degree of the EN AW-2024 aluminum alloy. The inhibition efficiency increases together with increasing the concentration of the citric acid. The study shows that the citric acid can be used as an ecological inhibitor to fight corrosion in a solution of H2SO4.
Źródło:
Journal of Ecological Engineering; 2023, 24, 1; 307--311
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of the kind and concentration of ethoxylated alcohols on the transport of citric acid through polymer inclusion membranes
Autorzy:
Dudek, M.
Przewoźna, M.
Gajewski, P.
Bogacki, M. B.
Powiązania:
https://bibliotekanauki.pl/articles/778004.pdf
Data publikacji:
2013
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
citric acid
polymer inclusion membranes
ethoxylated alcohols
Opis:
Research into the influence of ethoxylated alcohols on the citric acid transport through polymer inclusion membranes (PIMs) has been carried out. This process may be used in the future as one of the methods of citric acid isolation. Ethoxylated alcohols, which were GENAPOL® X020, X060 and X150, served as both: plasticizer and carrier. The results showed that the maximum values of citric acid fl ux [mol/(m2.s)] were equal to: 1.02.10-4 (X020), 1.57.10-4 (X060) and 1.77.10-4 (X150). The obtained results allow proceeding further study on using the polymer inclusion membranes, as an alternative to traditional methods of citric acid separation, which are precipitation and extraction.
Źródło:
Polish Journal of Chemical Technology; 2013, 15, 4; 89-94
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
PUR-PIR foam produced based on poly(hydroxybutyl citrate) foamed founded with different factories
Autorzy:
Liszkowska, J.
Czupryński, B.
Paciorek-Sadowska, J.
Borowicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/778855.pdf
Data publikacji:
2018
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
rigid foam
polyurethane
polyol
citric acid
condensation
Opis:
A poly(hydroxybutyl citrate) p(HBC) was obtained. The product compound produced in the solution during esterification, was added to rigid polyurethane-polyisocyanurate foams (PUR-PIR). The amount of petrochemical polyol in the foams was decreased in favor of the p(HBC) from 0.1 to 0.5 equivalent. The foams were foamed in two ways: with distilled water (W foams) and with Solkane 365/227 (S foams). The examination results of both foam series were compared. They showed that the foams foamed with water have higher softening temperature than the foams foamed with solkane. The retention values for both foam series are around 91–95%, and water absorption in the range of 0.7–3.2%. The anisotropy coefficient did not exceed 1.08 (the lowest value being 1.01).
Źródło:
Polish Journal of Chemical Technology; 2018, 20, 1; 87-95
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Leaching of zinc from low grade oxide ore using organic acid
Autorzy:
Irannajad, M.
Meshkini, M.
Azadmehr, A. R.
Powiązania:
https://bibliotekanauki.pl/articles/110892.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
leaching
zinc oxide ore
citric acid
smithsonite
Opis:
The leaching of low grade zinc oxide mining tailings by organic acid as a leaching agent was investigated. Zinc was extracted successfully from sample by citric acid leaching. The effects of solid-to- liquid ratio, acid concentration, reaction time, temperature and ore particle size on the leaching efficiency were studied. The results obtained showed that particle sizes and reaction time had not any significant effect on the leaching recovery of zinc from smithsonite in the sizes range of 40-350 μm. Under conditions: temperature of 80ºC, reaction time of 60 min, citric acid concentration of 0.5 mol/L, and solid to liquid ratio of 1:10, 82% of zinc could be recovered.
Źródło:
Physicochemical Problems of Mineral Processing; 2013, 49, 2; 547-555
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of chemical and biogenic leaching on surface area and particle size of laterite ore
Autorzy:
Pawlowska, A.
Sadowski, Z.
Powiązania:
https://bibliotekanauki.pl/articles/110297.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
nickel
laterite ores
leaching
citric acid
Aspergillus niger
Opis:
Currently there is a decline in the world’s nickel sulfide deposits, which are the main source of this metal. Due to the fact, that more than 70% of nickel reserves are in the form of oxide ores, more attention is nowadays paid on laterites. Leaching processes using different organic acids are widely described in the literature, but there is a lack of works linking influence of leaching process with the surface area and particle size distribution. Therefore, the main aim of this study was to examine how citric acid produced by microorganisms and citric acid added as chemical affected the specific surface and particle size distribution of mineral particles. The laterite ore was obtained from Szklary deposit, Poland. This study also compared the effect of chemical citric acid and filtrate after cultivation of Aspergillus niger on nickel extraction. It was observed that higher nickel recovery correspond to higher surface area of particles. The highest yield of nickel extraction was observed for a citric acid concentration of 1 mol/dm3 (67%). The specific surface area after leaching was 159 m2/g. An analysis of particle size distribution showed increase in the median particle size of particles after leaching with citric acid. It may suggest that dissolution of Polish laterites follows a shrinking core-shrinking particle model.
Źródło:
Physicochemical Problems of Mineral Processing; 2017, 53, 2; 869-877
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Produkcja kwasu cytrynowego z melasy z wykorzystaniem transformantów Yarrowia lipolytica
Production of citric acid from molasses using engineering strains of Yarrowia lipolytica
Autorzy:
Rakicka, M.
Lazar, Z.
Neuvéglise, C.
Rossignol, T.
Nicaud, J-M.
Robak, M.
Powiązania:
https://bibliotekanauki.pl/articles/2073116.pdf
Data publikacji:
2015
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
Yarrowia lipolytica
melasa
inwertaza
kwas cytrynowy
molasses
invertase
citric acid
Opis:
Drożdże Yarrowia lipolytica posiadają zdolność do wzrostu na substratach tłuszczowych, n-alkanach oraz niektórych cukrach, jak glukoza, fruktoza czy mannoza. Nie posiadają zdolności do wzrostu na sacharozie – głównym sacharydzie melasy buraczanej. W pracy wykorzystano transformanty Y. lipolytica z inwertazą z drożdży Saccharomyces cerevisiae do produkcji kwasu cytrynowego z melasy w bioreaktorowych hodowlach okresowych. Szczep A18M produkował 21,8 g/L kwasu cytrynowego z wydajnością 0,48 g/g i objętościową szybkością produkcji 0,8 g/L/h.
Yarrowia lipolytica reveal the ability to grow on fats or paraffins and they metabolize a few sugars, ie. glucose, fructose and mannose. They do not have the ability to hydrolyze sucrose – a main component of molasses. In this work Y. lipolytica transformants with cloned invertase from yeast Saccharomyces cerevisiae were used for efficient production of citric acid from molasses in bioreactor batch cultures. The A18M strain produced 21.8 g/L of citric acid with the yield 0.48 g/g and productivity of 0.8 g/L/h.
Źródło:
Inżynieria i Aparatura Chemiczna; 2015, 3; 111--113
0368-0827
Pojawia się w:
Inżynieria i Aparatura Chemiczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Removal of vanadium, potassium and iron from spent vanadium catalyst by leaching with citric acid at atmospheric pressure
Autorzy:
Mazurek, K.
Powiązania:
https://bibliotekanauki.pl/articles/778659.pdf
Data publikacji:
2014
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
citric acid
sulphur oxide
spent vanadium catalysts
leaching
recovery
Opis:
The effect of time, temperature, the catalyst particle size and the ratio of the catalyst weight to the leaching solution volume (S:L) on the treatment of spent vanadium catalyst components was determined using citric acid solutions at atmospheric pressure. The optimal parameters of catalyst leaching in 10% acid solutions at atmospheric pressure are: T = 323 K, t = 4 h, the particle size of less than 0.160 mm, the S:L ratio below 0.1. Under these conditions it was possible to dissolve about 90% of vanadium and potassium compounds and more than 60% of iron compounds contained in the catalyst. These results fall within the scope of research on a comprehensive method for recovering spent vanadium catalyst components.
Źródło:
Polish Journal of Chemical Technology; 2014, 16, 1; 59-62
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect and mechanism of citric acid on flotation separation of siderite and hematite
Autorzy:
Han, Huili
Yin, Wanzhong
Yao, Jin
Li, Dong
Powiązania:
https://bibliotekanauki.pl/articles/949693.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
siderite
hematite
citric acid
dispersion
flotation
E-DLVO theory
Opis:
Heterocoagulation can occur between fine siderite and hematite particles, which would result in the low efficiency of their separation during the flotation process. To date, there have been no mature methods to increase their separation efficiency. In this paper, citric acid was used as a regulator to enhance the slurry dispersion efficiency. Micro-flotation, scanning electron microscopy (SEM) analysis, settling tests, particle size measurements, zeta potential measurements and E-DLVO theoretical calculations were conducted in the investigations. A maximum recovery difference (53.98%) between siderite and hematite in their mixtures flotation was obtained. Settling tests confirmed that citric acid contributed to improving the dispersion degree of the slurry. SEM analysis indicated that citric acid could clean the surface of particles and weaken the coagulation between siderite and hematite, which were in line with the results of particle size measurements. The zeta potential measurements and Extended-Derjaguin-Landau-Verwey-Overbeek (E-DLVO) theoretical calculations indicated that the citric acid could adsorb on the siderite and hematite surfaces and decreased the surface charge, resulting in a visible increase of the repulsion energy between siderite and hematite particles. Therefore, citric acid can be applied to remove the easily-ground carbonate minerals first to improve the flotation performance of hematite in the separation process of carbonate-containing iron ores.
Źródło:
Physicochemical Problems of Mineral Processing; 2019, 55, 1; 311-323
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Produkcja lipaz i kwasu cytrynowego z glicerolu odpadowego przez drożdże Yarrowia lipolytica
Simultaneous production of lipases and citric acid from crude glycerol by Yarrowia lipolytica
Autorzy:
Rywińska, A.
Juszczyk, P.
Kancelista, A.
Biesiadecka, A.
Robak, M.
Niedbalska, J.
Powiązania:
https://bibliotekanauki.pl/articles/2070385.pdf
Data publikacji:
2009
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
Yarrowia lipolytica
glicerol
kwas cytrynowy
lipaza
glycerol
citric acid
lipase
Opis:
Badano zdolności drożdży Y. lipolytica Wratislavia 1.31 do produkcji enzymów lipolitycznych w hodowlach fed-batch podczas biosyntezy kwasu cytrynowego. Jako jedyne źródło węgla i energii zastosowano glicerol odpadowy oraz glicerol odpadowy z dodatkiem frakcji glicerynowej. W hodowli z glicerolem odpadowym otrzymano lipazy o wysokiej aktywności wobec tributyryny (4,7 UZT mL-1 i maślanu p-nitrofenolu 2.8 10-4 UzpNPB mL-1.
A purpose of the study was to determine the ability of yeast Y. lipolyt ca Wratislavia 1.31 to produce lipases in fed-bath cultures in mediui containing raw glycerol and raw glycerol together with glycerol fra< tion.as a carbon sources during citric acid biosynthesis. A higher, enzi matic activity was observed in medium containing only raw glycen 4.7 UZT mL-1 and 2.8 10-4 UzpNPB mL-1with tributyrin and p-n tro-phenyl butyrate, respectively.
Źródło:
Inżynieria i Aparatura Chemiczna; 2009, 3; 105-106
0368-0827
Pojawia się w:
Inżynieria i Aparatura Chemiczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Electrical Current and the External Source of Carbon on the Characteristics of Sludge from the Sequencing Batch Biofilm Reactors
Autorzy:
Kłodowska, I.
Rodziewicz, J.
Janczukowicz, W.
Powiązania:
https://bibliotekanauki.pl/articles/124816.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
bio-electrochemical reactor
denitrification
electrocoagulation
citric acid
potassium bicarbonate
sludge
Opis:
This work presents the results of an experiment on the effect of electrical current density (53, 105, 158 and 210 mA/m2), the type of an external source of carbon (citric acid, potassium bicarbonate) and C/NNO3 ratio (0.5, 1.0 and 1.5) on the quantity and quality of formed sludge. The experiment was conducted in sequencing batch biofilm reactors (SBBRs), under anaerobic conditions, with and without the passage of electrical current, under controlled pH of 7.5–8.0. The study demonstrated that in the reactors with electrical current passage and external source of carbon, the volume of sludge increased along with the current density increase from 53 to 158 mA/m2. At its highest density (210 mA/m2), the concentration of sludge was insignificantly lower. For all densities of electrical current and C/NNO3 values, the concentrations of sludge formed in the reactors with potassium bicarbonate (1.00 to 1.26 g d. m./L) were lower than in the reactors with citric acid (1.26 to 1.30 g d. m./L). The concentration of organic matter was higher in the sludge from the reactors with electrical current passage and potassium bicarbonate, compared to the sludge from the reactors with citric acid. In the reactors with electrical current passage and external source of carbon, the total nitrogen content in the sludge decreased along with the C/NNO3 ratio increase for current densities of 53 and 105 mA/m2. For a higher electrical current density, the nitrogen content in the sludge was similar. Irrespectively of the current density, the nitrogen content in the sludge from the reactors with citric acid was higher than in the sludge from the reactors with potassium bicarbonate. For higher current densities (158 and 210 mA/m2) the increase in the C/NNO3 value caused an increase in the P content in the sludge. The electrical current density increase contributed to increasing the content of phosphorus in the sludge. The phosphorus content in the sludge from the reactors with citric acid was lower than in the sludge from the reactors with potassium bicarbonate. The CST values prove that the sludge formed during the wastewater treatment in electrobiological SBBR was characterized by very high dewaterability. The capillary suction time decreased along with increasing the electrical current density but was not significantly affected by the type of carbon source.
Źródło:
Journal of Ecological Engineering; 2018, 19, 4; 143-152
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 41

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