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Tytuł:
Effects of Freeze-Thaw Cycles on the Flavor of Nanguo Pear
Autorzy:
Bai, Ge
Wang, Ya
Zheng, Jianrong
Zhang, Xiaomin
Zhuang, Zhaoyue
Zhu, Danshi
Cao, Xuehui
Powiązania:
https://bibliotekanauki.pl/articles/28408448.pdf
Data publikacji:
2024-02-16
Wydawca:
Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
Tematy:
Pyrus ussuriensis
organic acids
soluble solid content
volatile compounds
e-nose analysis
e-tongue analysis
Opis:
Frozen pears, obtained by repeated freezing and thawing under cold outdoor conditions in winter, are very popular in northeast China. The effects of three freeze-thaw cycles (FT1–FT3) on Nanguo pear flavor were studied under fast (−80°C) and slow (−20°C) freezing conditions. Significant differences were found in the flavor of Nanguo pear after subsequent freeze-thaw cycles. The total soluble solid (TSS) content of fresh pear was 14.17 g/100 g and increased significantly after the first freeze-thaw cycle to 17.57–18.17 g/100 g. Lower TSS content was found in pears after the repeated freeze-thawing process. Citric acid was determined as the main organic acid of Nanguo pear. Its content and the overall content of organic acids decreased successively after each freezing and thawing cycle. The electronic tongue analysis results showed that the sourness of fresh pears generally decreased after their repeated freezing and thawing, that the odor of Nanguo pear changed significantly after freeze-thaw cycles, and that nitrogen oxides and hydrocarbons were the most differentiating odor compounds. The content of ethyl caproate was the highest in the volatile compound profile of the Nanguo pear and ranged from 377.26 to 526.77 μg/kg. In short, after repeated freezing and thawing, the changes in the chemical composition impart the frozen pear a unique flavor.
Źródło:
Polish Journal of Food and Nutrition Sciences; 2024, 74, 1; 41-48
1230-0322
2083-6007
Pojawia się w:
Polish Journal of Food and Nutrition Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Physicochemical Properties, Antioxidant Capacity and Sensory Acceptability of Instant Rosehip Teas Prepared by Spray-Drying and Freeze-Drying Methods
Autorzy:
Baltaci, Cemalettin
Erkmen Bostanci, Dilara
Altintaş, Rahime
Dalkiran, Yusuf
Akdoğan, Arda
Okan, Onur T.
Powiązania:
https://bibliotekanauki.pl/articles/48899274.pdf
Data publikacji:
2024-08-22
Wydawca:
Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
Tematy:
antioxidants
Rosa canina
instant beverage
lyophilization
phenolics
soluble powder
Opis:
In this study, the physicochemical properties, antioxidant capacity, sensory properties, and phenolic and mineral profiles of instant rosehip teas prepared using spray-drying (SD) and freeze-drying (FD) were compared. The yield of instant tea produced using FD and SD was 23.75 and 21.25 g/100 g, respectively. The total color difference between the FD and SD tea was 50.74, with the SD sample exhibiting higher redness and yellowness. The FD tea was richer in ascorbic acid than SD tea (67.2 and 59.4 mg/100 g dry weight, DW, respectively). The mineral content ranged from 0.20 mg/kg DW (copper) to 2,837 mg/kg DW (potassium) in SD tea, and from 0.31 mg/kg DW (copper) to 3,083 mg/kg DW (potassium) in FD samples. The total phenolic content was 1,315 and 1,495 mg GAE/100 g DW of SD and FD samples, respectively. The antioxidant capacity of instant rosehip teas was determined as total antioxidant capacity, ferric reducing antioxidant power and DPPH radical scavenging activity. In all these assays, FD tea was found to have a higher antioxidant capacity. In the phenolic profile determined by liquid chromatography-tandem mass spectrometry (LC-MS/MS) technique, protocatechuic acid dominated in instant rosehip teas prepared using both methods. The main flavonoids identified were quercetin, quercitrin, hyperoside and luteolin 7-glucoside. Following the sensory analysis, the panelists have generally preferred the FD tea in terms of aroma and flavor, while opting for the SD tea in terms of appearance and color. In conclusion, although freeze-drying allowed obtaining a product with a higher antioxidant capacity and antioxidant content than spray-drying, both drying methods may be considered suitable for the production of instant rosehip teas and ensure obtaining a functional food product.
Źródło:
Polish Journal of Food and Nutrition Sciences; 2024, 74, 3; 244-254
1230-0322
2083-6007
Pojawia się w:
Polish Journal of Food and Nutrition Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
4-methyl-4-[2-(naphthalene)-2-oxoethyl] morpholin-4-ium iodide as a water soluble photoinitiator
Jodek 4-metylo-4-[2-(naftalen-2-ylo)-2-oksoetylo]morfolin-4-iowy jako rozpuszczalny w wodzie fotoinicjator
Autorzy:
Ozcan, Fatma
Dogruyol, Zekeriya
Keskin Dogruyol, Sevnur
Powiązania:
https://bibliotekanauki.pl/articles/24202835.pdf
Data publikacji:
2023
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Chemii Przemysłowej
Tematy:
photopolymerization
water-soluble photoinitiators
quaternary ammonium salt
fotopolimeryzacja
fotoinicjatory rozpuszczalne w wodzie
czwartorzędowe sole amoniowe
Opis:
Quaternary ammonium salt namely 4-methyl-4-[2-(naphthalen-2-yl)-2-oxoethyl] morpholin-4-ium iodide (WSMPM) was synthesized and characterized. High molar absorptivity at 347 nm (1910 L • mol-1 • cm-1) and good solubility in distilled water (10-2 M) allows WSMPM to be used as an effective photoinitiator also in water-soluble systems. Photopolymerization of acrylamide monomer with WSMPM (10-3 M) and a tertiary amine (N-methyldiethanolamine), resulted in 84.4% monomer to polymer conversion. Based on laser photolysis and electron spin resonance, a photoinitiator mechanism was proposed.
Otrzymano i scharakteryzowano czwartorzędową sól amoniową – jodek 4-metylo-4-[2-(naftalen-2-ylo)-2-oksoetylo]morfolin-4-iowy (WSMPM). Związek charakteryzuje się dużą wartością molowego współczynnika absorpcji promieniowania o długości fali 347 nm (1910 L • mol-1 • cm-1) oraz dobrą rozpuszczalnością w wodzie, co pozwala na jego zastosowanie jako efektywnego fotoinicjatora, także w układach wodnych. W przypadku fotopolimeryzacji akryloamidu w obecności WSMPM i trzeciorzędowej aminy (N-metylodietanoloaminą) uzyskano ponad 84-proc. konwersję monomeru do polimeru. Na podstawie fotolizy laserowej i elektronowego rezonansu spinowego zaproponowano mechanizm fotoinicjacji.
Źródło:
Polimery; 2023, 68, 4; 215--220
0032-2725
Pojawia się w:
Polimery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of Humic Acid Extracted from Organic Waste Composts on Turnip Culture (Brassica rapa subsp. rapa) in a Sandy Soil
Autorzy:
Aylaj, Mina
Sisouane, Mhammed
Tahiri, Soufiane
Mouchrif, Yassine
El Krati, Mohammed
Powiązania:
https://bibliotekanauki.pl/articles/27323830.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
compost
humic acid
turnip
growth
chlorophyll foliar
protein
total soluble sugar
Opis:
Adding humic acid to soil can improve soil structure and fertility, which can lead to better plant growth and higher crop yields. Extracting humic acid from compost is a sustainable and environmentally friendly way to obtain a valuable organic material. Humic acid (HA) can be extracted from compost relatively easily and at a low cost, making it an attractive option for farmers. In this study, we investigated the use of sugarcane bagasse (SB) and immature horse manure (IHM) as bulking agents for the composting of separated municipal solid waste (SMSW) and the extraction and characterization of humic acid from the mature composts produced. Fertilizing solutions containing different concentrations of humic acid were prepared and used to evaluate their effects on turnip crop growth and various biochemical parameters during cultivation. The results showed that the humic acid extracted from the composts had high yields and were rich in elemental carbon. The application of humic acid at both low and high concentrations resulted in a significant improvement in all the parameters measured except for the total protein in the roots, which did not differ significantly between the humic acid concentrations. The yield, root diameter and fresh weight increased significantly, and the leaf area was proportional to the humic acid concentration of the solution used. The highest increase in chlorophyll a content was observed in the treatment of humic acid extracted from composts C2 and C3 at a concentration of 0.1 gL-1, with an increase of 31% and 37%, respectively, compared to the control. The use of humic acid provided by co-compost can be considered a successful management strategy for degraded sandy soils and sustainable agriculture production in sandy poor soils worldwide.
Źródło:
Journal of Ecological Engineering; 2023, 24, 7; 345--359
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluating the Total Phenolic, Protein Contents, Antioxidant and Pharmacological Effects of Cynodon dactylon Extracts Against Escherichia coli and Staphylococcus aureus
Autorzy:
Ibrahim, Muhammad
Riaz, Moazama
Ali, Akbar
Shaheen, Musarat
ur Rahman, Shafiq
Aziz, Riffat
Alamri, Abdulhakeem S.
Alhomrani, Majid
Dablool, Anas S.
Alghamdi, Saad
Sameeh, Manal Y.
Tashkandi, Manal A.
Powiązania:
https://bibliotekanauki.pl/articles/27315658.pdf
Data publikacji:
2023
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
Cynodon dactylon
Anti-microbial
Flavonoids
Total Soluble Proteins
Peroxidase
Antioxidant
Super oxide Dismutase
Opis:
The study was aimed to characterize the antioxidant and anti-microbial activities of Cynodon dactylon with special reference on its precise biochemical analysis. Physiological analysis that total carotenoids content (0.3884 ± 0.0172 mg/g), total chlorophyll content (6.1460 ± 0.2915 mg/g), total phenolic contents (13.4703 ± 0.1494 mg/g), chlorophyll a (3.7708 ± 0.1528 mg/g, catalase (CAT) contents (40.2844 ± 0.1515 units/ mg), total anthocyanin contents (5.0166 ± 0.2966 g–1 FW) total soluble proteins (2.9916 ± 0.1734 mg/g) and total flavonoids content (TFC) (4.7863 ± 0.0442 μg/g) was found higher in the leaves of the Cynodon dactylon whereas, chlorophyll b (2.4881 ± 0.1326 mg/g) was found higher in the stem of Cynodon dactylon, while, peroxidase (POD) contents (81.8763 ± 4.6609 units/mg) and superoxidase dismutase (SOD) activity (80.4346 ± 5.9367 units/mg) was investigated higher in roots of Cynodon dactylon. The anti-microbial activity of Cynodon dactylon extracts was performed using a good diffusion technique against two microbial strains. Among all the plant extracts, the methanolic extracts showed a maximum inhibition zone (26.87 mm) against anti-bacterial strain Escherichia coli whereas n-hexane extract showed a maximum inhibition zone (17.88 mm) against anti-fungal strain Candida albicans. This study reported the antimicrobial activity of Cynodon dactylon against some common pathogens such as Staphylococcus aureus, Escherichia coli, and Candida albicans, which are highly associated with nosocomial infection. From the given results it is concluded that Cynodon dactylon could be exploited in pharmacology due to its antioxidant and anti-microbial properties.
Źródło:
Polish Journal of Chemical Technology; 2023, 25, 3; 110--119
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Exploring dog antler chews as a novel source of collagen supplementation: extraction and characterization of collagen from red deer antlers
Autorzy:
Pepłowska, Kamila
Wałecka, Joanna
Bąkowski, Paweł
Dzięgielewski, Zbyszko
Dzięgielewski, Damian
Grzywacz, Kamilla
Powiązania:
https://bibliotekanauki.pl/articles/16706190.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
collagen
antler-derived collagen
acid-soluble collagen
collagen extraction method
collagen isolation optimization
Opis:
Collagen is the body’s most abundant protein and is primarily found in the skin, bones, tendons, and ligaments of animals and fish. As the interest in collagen supplementation grows, new sources of this protein are continually being introduced. We have confirmed that red deer antlers are a source of type I collagen. We investigated the effects of chemical treatment, temperature, and time on the extractability of collagen from red deer antlers. The optimal conditions for obtaining the highest collagen yield were determined to be: 1) removing noncollagenous proteins at 25°C for 12 h in an alkaline solution, 2) defatting at 25°C using a 1 : 10 grounded antler : butyl alcohol ratio, and 3) acidic extraction lasting 36 h using a 1 : 10 antler:acetic acid ratio. Under these conditions, we obtained a collagen yield of 22.04%. The molecular characterization of red deer antler collagen revealed typical features of type I collagens, including the presence of three "-chains, high glycine content, and high levels of proline and hydroxyproline, as well as helical arrangements. This report suggests that red deer antlers have significant potential as a source of collagen supplements.
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2023, 104, 2; 199-208
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wzrost i owocowanie wybranych odmian porzeczki czarnej
Growth and fruiting of selected blackcurrant cultivars
Autorzy:
Koniarski, Michał
Sitarek, Mirosław
Kubik, Monika
Powiązania:
https://bibliotekanauki.pl/articles/2232943.pdf
Data publikacji:
2023-07-12
Wydawca:
Centrum Doradztwa Rolniczego w Brwinowie. Oddział w Poznaniu
Tematy:
odmiany porzeczki czarnej
wzrost pędów
kwitnienie
plonowanie
masa owoców
ekstrakt
dojrzałość zbiorcza
zawartość chlorofilu
(SPAD)
black currants cultivars
shoot growth
flowering
yield
fruit weight
soluble
solids content
harvesting time
SPAD
Opis:
W doświadczeniu polowym założonym jesienią 2020 roku w Sadzie Doświadczalnym IO-PIB w Dąbrowicach oceniano wzrost i owocowanie młodych krzewów trzynastu odmian porzeczki czarnej (Ribes nigrum L.). Największą liczbę pędów wegetatywnych w pierwszym roku po posadzeniu wytworzyły krzewy odmian ‘Ben Lomond’, ‘Tisel’ oraz ‘Gofert’. Najmniej pędów stwierdzono u krzewów odmian: ‘Ruben’, ‘Titania’ i ‘Bona’. Najdłuższe pędy miały krzewy odmian ‘Polben’ i ‘Tiben’, zaś najkrótsze – ‘Ores’, ‘Öjebyn’, ‘Polonus’ i ‘Ruben’. Najdłuższymi gronami cechowały się odmiany ‘Tisel’ i ‘Gofert’. Najkrótsze grona miały odmiany ‘Bona’, ‘Ruben’ oraz ‘Ben Lomond’. Najwyższy plon w drugim roku po posadzeniu uzyskano z krzewów odmian: ‘Ben Lomond’, ‘Tihope’, ‘Tiben’, ‘Polben’, ‘Tisel’, ‘Gofert’. Najsłabiej plonowały: ‘Titania’, ‘Öjebyn’, ‘Ores’ oraz ‘Polonus’. Największe owoce, o masie ponad 2 g, wytworzyły krzewy odmiany ‘Bona’, natomiast najmniejsze owoce miały krzewy odmian ‘Polonus’ (0,9 g) i ‘Öjebyn’ (1 g). Najwyższą zawartością ekstraktu charakteryzowały się owoce odmiany ‘Gofert’, zaś najmniej ekstraktu miały owoce odmian ‘Ores’ i ‘Polben’. Pomiary intensywności zielonej barwy liści wykazały najwyższą wartość tego parametru u odmiany ‘Tines’, a najniższą – u odmian ‘Gofert’ i ‘Tisel'.
In a field experiment set up in autumn 2020 in the Experimental Orchard in Dąbrowice, the growth and fruiting of young bushes of thirteen cultivars of blackcurrant (Ribes nigrum L.) were assessed. The largest number of vegetative shoots in the first year after planting was produced by bushes of the cultivars 'Ben Lomond', 'Tisel' and 'Gofert'. The fewest shoots were found in the cultivars: 'Ruben', 'Titania' and 'Bona'. The longest shoots were found in the cultivars 'Polben' and 'Tiben', and the shortest – 'Ores', 'Öjebyn', 'Polonus' and 'Ruben'. The cultivars 'Tisel' and 'Gofert' had the longest cluster length. The shortest clusters were found in 'Bona', 'Ruben' and 'Ben Lomond'. The highest yield in the second year after planting was obtained from the 'Ben Lomond', 'Tihope', 'Tiben', 'Polben', 'Tisel', 'Gofert' cultivars. The lowest yields had 'Titania', 'Öjebyn', 'Ores' and 'Polonus'. The largest fruit, weighing more than 2 g, was produced by the 'Bona' cultivar, while the smallest fruit was produced by the 'Polonus' (0.9 g) and 'Öjebyn' (1 g) cultivars. The highest content of soluble solids was found in the 'Gofert' fruits, while the lowest was found in the fruit of the 'Ores' and 'Polben' cultivars. Measurements of the intensity of the green color of leaves (SPAD) showed the highest value of this parameter in the cultivar 'Tines', and the lowest - in the cultivars 'Gofert' and 'Tisel'.
Źródło:
Zagadnienia Doradztwa Rolniczego; 2023, 112, 2; 68-82
1232-3578
2719-8901
Pojawia się w:
Zagadnienia Doradztwa Rolniczego
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Relationship between selected quality characteristics and levels of water-soluble proteins in porcine longissimus muscle
Zależność między wybranymi cechami jakościowymi wieprzowego mięśnia longissimus a zawartością w nim białek rozpuszczalnych w wodzie
Autorzy:
Karamucki, T.
Powiązania:
https://bibliotekanauki.pl/articles/29433588.pdf
Data publikacji:
2022
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
pig
longissimus lumborum muscle
pork quality
indicator
pH
water-soluble protein
Źródło:
Acta Scientiarum Polonorum. Zootechnica; 2022, 21, 4; 23-30
1644-0714
Pojawia się w:
Acta Scientiarum Polonorum. Zootechnica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rozpuszczalne związki wolframu. Metoda oznaczania w powietrzu na stanowiskach pracy
Soluble tungsten compounds. Determination in workplace air
Autorzy:
Wasilewski, Paweł
Powiązania:
https://bibliotekanauki.pl/articles/1845103.pdf
Data publikacji:
2021
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
wolfram
metoda analityczna
powietrze na stanowiskach pracy
spektrofotometria
rozpuszczalne związki wolframu
nauki o zdrowiu
inżynieria środowiska
tungsten
determination method
workplace air
spectrophotometry
soluble tungsten compounds
health sciences
environmental engineering
Opis:
Wolfram jest metalem przejściowym, który występuje w skorupie ziemskiej w postaci minerałów, z których po wydobyciu jest ekstrahowany. Brakuje danych na temat chronicznych efektów kontaktu z wolframem. Wolfram metaliczny w postaci drobnego proszku jest łatwopalny i może powodować mechaniczne podrażnienie skóry i oczu. Istnieją rozpuszczalne związki wolframu, które są sklasyfikowane jako związki toksyczne, powodujące uszkodzenie oczu i zagrażające środowisku wodnemu. Celem prac badawczych była nowelizacja normy PN-Z-04221-3:1996 dotyczącej oznaczania rozpuszczalnych związków wolframu na stanowiskach pracy metodą spektrofotometryczną z rodankiem potasu. Nowelizacja normy została przeprowadzona, ponieważ norma PN-Z-04221-3 opisuje metodę, w której oznaczalność wynosi 0,25 wartości NDS, a zgodnie z normą europejską PN-EN 482 oznaczalność metody musi być w zakresie 0,1 ÷ 2 NDS. Metoda polega na zatrzymaniu aerozolu rozpuszczalnych związków wolframu na filtrze z mieszaniny estrów celulozowych, a następnie rozpuszczeniu ich w wodzie. W kolejnym etapie wolfram redukowany jest z użyciem chlorku cyny, a następnie ulega reakcji z rodankiem potasu, dając barwny kompleks, który należy ekstrahować alkoholem izoamylowym, aby następnie zmierzyć absorbancję ekstraktu na spektrofotometrze UV-Vis. Pomiary wykonano z użyciem spektrofotometru UV-Vis Heλios firmy ThermoSpectronic model Beta. Wymagania walidacyjne przedstawione w normie europejskiej PN-EN 482 zostały spełnione przy wykonywaniu pomiarów. Dzięki metodzie można oznaczać znajdujące się w powietrzu rozpuszczalne związki wolframu o stężeniach 0,1 ÷ 2 mg/m³ . Granica oznaczalności LOQ wynosi 1,875 ng. Precyzja pomiarów wynosi 5,06%, a niepewność rozszerzona 22,09%. Metoda oznaczania rozpuszczalnych związków wolframu została przedstawiona w postaci procedury analitycznej, którą zamieszczono w załączniku. Zakres tematyczny artykułu obejmuje zagadnienia zdrowia oraz bezpieczeństwa i higieny środowiska pracy będące przedmiotem badań z zakresu nauk o zdrowiu oraz inżynierii środowiska.
Tungsten is a transition metal which occurs in the Earth’s crust as minerals which after being mined is extracted. There is no data on chronic effects of contact with tungsten, although fine tungsten powder is flammable and can cause mechanical irritation to skin and eyes. However, there are soluble tungsten compounds, which are classified as toxic, causing damage to the eyes, and being harmful to the aquatic environment. The aim of the study was to amend Standard No. PN-Z-04221-3 determination of soluble tungsten compounds in workplace air using spectrophotometric method with potassium thiocyanate. The amendment was performed because Standard No. PN-Z-04221-3 describes a method in which the quantification is 0.25 mg/m³ , according to European Standard No. EN 482 the quantification of method must be in range of 0.1 – 2 mg/m³ . The method is based on depositing soluble tungsten compounds on a cellulose esters filter and then dissolving them in water. Then tungsten is reduced with tin chloride, after reaction with potassium thiocyanate, tungsten becomes a complex. Tungsten complex should be extracted with isoamyl alcohol and then absorbance should be measured on a UV-Vis spectrophotometer. The tests were performed with the UV-Vis Heλios spectrophotometer by ThermoSpectronic model Beta. The validation requirements of European Standard No. EN 482 were met. With this method soluble tungsten compounds in air can be determined at concentration of 0.1 – 2 mg/m³ . The limit of quantification (LOQ) is 1.875 ng. The overall accuracy of the method is 5.06% and its relative total uncertainty is 22.09%. The method for determining tungsten has been recorded in a form of an analytical procedure (see Appendix). This article discusses problems of occupational safety and health, which are covered by health sciences and environmental engineering.
Źródło:
Podstawy i Metody Oceny Środowiska Pracy; 2021, 2 (108); 167-177
1231-868X
Pojawia się w:
Podstawy i Metody Oceny Środowiska Pracy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chemical and thermal characteristics of soluble polysaccharides from fruit pericarps of the Algerian Argania spinosa
Autorzy:
Hachem, Kadda
Boudraa, Kamel Eddine
Kaid-Harchea, Meriem
Powiązania:
https://bibliotekanauki.pl/articles/949476.pdf
Data publikacji:
2020
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
Argania spinosa pericarp
Soluble polysaccharides
GC
FTIR
DSC
Opis:
Soluble polysaccharides were isolated from fruit pericarps of the Algerian Argania spinosa. The cell wall fraction was subjected to sequential extractions with H2O (2 × 2 h at 100oC), EDTA (1%, 6 h at 80oC) and KOH(1 and 4 M, 14 h at 25oC) . The structures of the obtained polysaccharide fractions were characterized using gas chromatography (GC), infrared spectroscopy (FTIR) and differential scanning calorimetry (DSC). The presence of arabinose, galactose and rhamnose in the pectin fractions suggests the presence of rhamnogalacturonan, while the abundance of xylose in the hemicellulosic fractions indicates the presence of xylan. The DSC data revealed the endothermal behavior of all the soluble polysaccharides and only two thermal transitions, the glass transition (Tg) and the fusion transition (Tf) have been recorded.
Źródło:
Polish Journal of Chemical Technology; 2020, 22, 4; 17-21
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling Soluble Contaminant Migration by Advection Process in Subsurface Water in the Eastern Niger Delta, Nigeria
Autorzy:
Ugbena, K. G.
Tse, A. C.
Akpokodje, Enuvie G.
Powiązania:
https://bibliotekanauki.pl/articles/1030673.pdf
Data publikacji:
2020
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Aquifer
advective velocity
conservative tracer
migration
soluble contaminant
subsurface water
Opis:
The advective property of an aquifer in the Eastern Niger Delta was evaluated using a conservative tracer. Tracer migration was monitored in observation boreholes at various radial distances simultaneously. Particle size distribution analysis for the sand samples collected from the boreholes in the study site revealed aquifer composition to be predominantly fine sand (silt =13.42%, fine sand = 41.76%, medium sand = 36.71% and coarse sand = 8.09%) for the 8m depth sampled. This field tracer test thus, provides a definitive data on the simultaneous transport of a soluble contaminant and allows a quantitative appraisal of the advective property of the study site. The mean velocity determined 1.212×10-3 ms-1, represents the advective velocity of groundwater carrying the dissolved tracer substance. This is an indication of how soluble components of hydrocarbon will be transported in the study area. Modeling tracer migration by advection process to estimate where and when a soluble contaminant problem can first be noticed in an environmental matrix and its application in hydrological studies is an effective tool to address problems such as sustainability and uncertainty in groundwater resource system.
Źródło:
World Scientific News; 2020, 139, 2; 102-114
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Porównanie składu chemicznego kory szybko rosnącej topoli z korą innych gatunków drzew liściastych
Comparison of chemical composition of bark of fast−growing poplar with bark of other deciduous tree species
Autorzy:
Krutul, D.
Antczak, A.
Radomski, A.
Wójcik, R.
Drożdżek, M.
Zawadzki, J.
Powiązania:
https://bibliotekanauki.pl/articles/978916.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
bark
mineral substances
extractives
cellulose
lignin
soluble substances in 1% NaOH
Opis:
The aim of the study was to compare the content of some chemical substances in a bark of about 3−year−old fast−growing poplars Populus deltoides × maximowiczii and Populus trichocarpa with literature data on the chemical composition of a bark of older deciduous trees. The Populus deltoides × maximowiczii and Populus trichocarpa material were obtained from the Wolica experimental field belonging to the Institute of Biology, Department of Genetics, Plant Breeding and Biotechnology at Warsaw University of Life Sciences. Using the standard laboratory procedures, the chemical composition of the bark was examined, i.e. the content of extractives and mineral substances, cellulose, lignin and the content of soluble substances in 1% NaOH. The cellulose content in the bark of the 3−year−old poplars tested was higher by from 10 to 23% in relation to its content in the bark of older trees. Whereas, the content of lignin in the bark of the 3−year−old poplars was lower by from 10 to 20% compared to its content in the bark of other older trees. It was found that based on the data obtained, it is difficult to clearly determine which of the generally accepted factors affect the content of mineral substances and substances soluble in 1% NaOH in the bark. However, the content of extractives soluble in a mixture of ethanol and benzene (1:1) w/w, chloroform and ethanol (93:7) w/w as well as cellulose and lignin in the bark depends on the species, age, habitat conditions of the trees and the height of the trunk from which the samples were collected.
Źródło:
Sylwan; 2020, 164, 09
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study on biofouling mechanism in IMBR for wastewater treatment with different temperatures
Autorzy:
Yu, Yaqin
Powiązania:
https://bibliotekanauki.pl/articles/204994.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
quorum sensing
extracellular polymeric substances
biofouling
integrated membrane bioreactor
transmembrane pressure
soluble microbial products
Opis:
The main goal of the present study was to examine the operating characteristics and mechanisms of membrane fouling in integrated membrane bioreactors (IMBRs) at different temperatures. Two IMBRs, each with identical dimensions and configurations, were used in the study using synthetic domestic sewage at a low temperature (10°C) and high temperature (25°C). The results indicated that the removal efficiency of chemical oxygen demand reached 93–96%, but the membrane contribution rate of IMBR2 (10°C) was higher than that of IMBR1 (25°C). The separation burden of the membrane on organic compounds increased at low temperature, which may have sped up the rate of membrane biofouling. The absolute rate of trans-membrane pressure build-up was faster at low temperature, leading to shorter IMBR operating times. Soluble microbial products (SMPs) and extracellular polymeric substances (EPSs) in the IMBRs significantly increased at low temperature. These substances intensified deflocculation, with an accompanying reduction of floc size and the release of EPSs at low temperature, which facilitated the formation of cake foulants on the surface, covering the entire membrane area. The protein and polysaccharide concentrations of SMPs and EPSs in the IMBRs were correlated with the concentration of C8-HSL. It was demonstrated that temperature affected the concentration of C8-HSL, which controlled the excretion of EPSs and SMPs and thus the membrane biofouling process.
Źródło:
Archives of Environmental Protection; 2020, 46, 2; 3-11
2083-4772
2083-4810
Pojawia się w:
Archives of Environmental Protection
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The use of mineral materials for salinity control in roadside soils
Autorzy:
Łuczak, Katarzyna
Pisarek, Izabella
Kusza, Grzegorz
Powiązania:
https://bibliotekanauki.pl/articles/205335.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
urban soils
readily soluble salts
desalination
Opis:
This paper presents the results of a fi eld study on using mineral materials (fine-grained sand and medium- -grained gravel) to reduce the concentration of readily soluble salts in a roadside environment. The investigated soils were Rendzic Sceletic Leptosols from an urban area characterized by a shallow humus horizon with a high content of skeletal parts, as well as a lack of homogeneity of the material in the soil profile. All soil samples were taken from five plots located along the main streets in the city of Opole (Southern Poland). It was revealed that the use of fine-grained sand and medium-grained gravel improved the structure of the surface soil layer, and thus favoured the migration of Na+ and Cl- ions into the soil profile. In comparison to control surfaces readily soluble salts were reduced with gravel and sand application. Furthermore, the mineral materials introduced on the soil surface for salinity neutralization did not affect the quality of the tested roadside calcareous soils. The results indicate that the use of mineral materials reduces soil salinity caused by NaCl. They also show the need to find new methods of salt neutralization, especially of roadside soils in order to improve and protect the quality of the environment.
Źródło:
Archives of Environmental Protection; 2020, 46, 2; 83-90
2083-4772
2083-4810
Pojawia się w:
Archives of Environmental Protection
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ultrafiltration as a method to obtain sugar reduced cloudy juices a research on juice’s properties
Ultrafiltracja jako metoda otrzymywania soków o zmniejszonej zawartości cukru - badanie właściwości soków
Autorzy:
Barańska, A.
Kot, A.
Samborska, K.
Powiązania:
https://bibliotekanauki.pl/articles/13925568.pdf
Data publikacji:
2020
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
ultrafiltration
cloudy juice
apple juice
red beet juice
sugar
reduction
total soluble solid
titratable acidity
Źródło:
Zeszyty Problemowe Postępów Nauk Rolniczych; 2020, 600; 3-11
0084-5477
Pojawia się w:
Zeszyty Problemowe Postępów Nauk Rolniczych
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 103

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