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    Wyświetlanie 1-8 z 8
    Tytuł:
    Production of regenerated cellulose polymeric films from plantain pseudostem
    Autorzy:
    Sunday, Esther Aniedi
    Powiązania:
    https://bibliotekanauki.pl/articles/1118878.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    cellulose
    plantain pseudostem
    pulp
    regenerated cellulose
    Opis:
    Regenerated cellulose was prepared from plantain pseudo stem obtained in Uyo, Akwa Ibom State. The pulp prepared with 12% NaOH had moisture content of 8.8% and a yield of 36.9% on the average. The pulp was bleached and exposed to air to form “white crumbs”. The aged crumbs was mixed with carbon disulphide at a controlled temperature of 30 °C to form cellulose xanthate (C6H9O4–S–SNa)n. This was then converted to regenerated cellulose by way of further treatment with tetraoxosulphate (VI) acid at a yield of 36.4%. This work has revealed that plantain pseudo stem waste can be converted to regenerated cellulose for diverse applications.
    Źródło:
    World News of Natural Sciences; 2017, 7; 26-29
    2543-5426
    Pojawia się w:
    World News of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Chemical Composition of Lowland Bamboo (Oxytenanthera abyssinica) Grown around Asossa Town, Ethiopia
    Autorzy:
    Tolessa, Amsalu
    Woldeyes, Belay
    Feleke, Sisay
    Powiązania:
    https://bibliotekanauki.pl/articles/1179595.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Cellulose
    Chemical composition
    Hemicelluloses
    Lignin
    Oxytenanthera abyssinica
    Opis:
    The selection of bamboo species for various applications in the chemical and biochemical related industry is related to the chemical composition. This research was carried out to study the major chemical compositions of bamboo culms grown around Assosa town in Ethiopia. Lowland bamboo (Oxytenanthera abyssinica) samples were harvested, sorted, dried, milled using Wiley Mill, sieved and all chemical characteristics were determined in accordance with the standards outlined in ASTM except Kurchner-Hoffer and Alkali extraction method for cellulose and hemicellose determination, respectively. From the study it showed that the average results of the main chemical composition (Cellulose, Hemicelluloses and Lignin) were 52.06, 16.90 and 22.47%, respectively. The Ash content of Oxytenanthera abyssinica was 5.30% while the extractives content (Hot-water & Alcohol-toluene solubility) was 6.80 and 5.60%, respectively.
    Źródło:
    World Scientific News; 2017, 74; 141-151
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Chemical Composition of Yushania alpina (K. Schum.) W.C.Lin (1974) (Highland Bamboo) Grown in Ethiopia
    Autorzy:
    Tsegaye, Mahelete
    Chandravanshi, B. S.
    Feleke, Sisay
    Redi, Mesfin
    Powiązania:
    https://bibliotekanauki.pl/articles/1031511.pdf
    Data publikacji:
    2020
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Cellulose
    Chemical composition
    Hemicellulose
    Lignin
    Yushania alpina
    Opis:
    Chemical properties of any lignocellulose species are one of the major properties that used to select the material for any purpose either chemical or biological. Since bamboo is one of the woody grass species used for various applications worldwide; therefore knowing the chemical composition plays greater a role. Based on the above assumption, this research was conducted to study the major chemical composition of Yushania alpina (K. Schum.) W.C.Lin (1974) (Highland Bamboo) grown around Enjibara in Ethiopia. In the work, Yushania alpina (Highland Bamboo) sample was harvested, dried, milled using a Wiley Mill, sieved and all chemical composition were determined based on the National Renewable Energy Laboratory (ASTM) approaches, except that the Kurschner-Hoffer method (1931) was applied for cellulose determination. Based on the study, the chemical composition characterization shows that Yushania alpina has 46.76% cellulose content, 25.27% lignin content, 12.18% hemicellulose, 3.77% ash, 12.23% hot-water extractive and 3.93% ethanol-toluene extractives.
    Źródło:
    World News of Natural Sciences; 2020, 32; 1-9
    2543-5426
    Pojawia się w:
    World News of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Transformation of bacterial cellulose into a scaffold-like material as a new hope for tissue engineering
    Autorzy:
    Kaźmierczak, Marta
    Powiązania:
    https://bibliotekanauki.pl/articles/1177784.pdf
    Data publikacji:
    2018
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Gluconacetobacter xylinum
    bacterial cellulose
    scaffold
    tissue engineering
    Opis:
    Scaffolds are three-dimensional structures used in medicine, especially in tissue engineering, for the reconstruction of damaged tissue or organ. They should be constructed in a special way, to provide support for different cells’ vital functions. Bacterial cellulose produced by Gluconacetobacter xylinus has congruous features to natural occurring extracellular matrixes. Natural pores which occure in cellulose‘s structure have not adequate diameter to colonize them with viable cells. The authors conducted some experiments in order to enlarge channels in cellulose structure. Repeated frosting and defrosting of accurately prepared cellulose samples has created positive results but application of sterile mixture of vegetable oil during culture process gave expected results – diameter of the channels and chambers was big enough to colonize them with viable cells.
    Źródło:
    World Scientific News; 2018, 100; 239-243
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sustain release Formulation and Evaluation of Ofloxacin floating delivery system
    Autorzy:
    Patel, A. J.
    Naik, D. R.
    Raval, J. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/412207.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    ofloxacin
    ethyl cellulose
    xanthum gum
    floating drug delivery System
    controlled release
    Opis:
    Floating tablets has been accepted as a process to achieve controlled drug delivery by prolonging the residence time of the dosage form at the site of absorption, thereby improving and enhancing the bioavailability of drug. The objective of present study outlines the development and characterization the floating drug delivery system of Ofloxacin to enhance its bioavailability and therapeutic efficacy, using different grades of polymer along with effervescent agent sodium bicarbonate and citric acid. Ofloxacin is a synthetic chemotherapeutic second-generation antibiotic of the fluoroquinolone class. Different tablet formulations were formulated by wet granulation technique and were evaluated for physical parameters like Tablet Thickness, Hardness, % Friability, Weight variation, Content uniformity, In vitro buoyancy, Swelling index, In vitro dissolution study and drug release mechanisms. As the concentration of the polymer in the formulations increased the release of drug decreased. Hence it was considered as suitable candidate for formulation as floating drug delivery system. Different kinetic models were applied to drug release data in order to evaluate release mechanisms and kinetics. The optimized formula F4 showed better sustained drug release with good floating properties and fitted best to be Korsmeyer-Peppas model with R2 value of 0.9575. As the n value for the Korsmeyer- Peppas model was found be more than 0.5 it follows Non-Fickian diffusion mechanism. FTIR result showed that there is no drug excipients interaction.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2014, 12; 69-83
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Enhancement of Some Mechanical Properties of Polyethylene Glycol by Adding Carboxymethyl Cellulose as a Blends and Applied in Wood Glue
    Autorzy:
    Obeid, Karrar Abd-Ali
    Al-Bermany, Abdul-Kareem J.
    Habeeb, Majeed Ali
    Powiązania:
    https://bibliotekanauki.pl/articles/1193936.pdf
    Data publikacji:
    2015
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Acoustical Properties
    CMC
    Carboxymethyl Cellulose
    PEG
    Polyethylene Glycol
    Ultrasonic Technique
    Wood Glue
    Opis:
    The (PEG/CMC) blends were prepared by liquids mixing method, the appropriate concentrations of PEG were (0.1-0.2 to 0.8 g/mL)% are dissolved in (500 mL) of distilled water under stirring without heat for (20 min.) then added the CMC with two weights (0.25 and 0.5) g for each PEG concentrates at (288 K). In order to evaluate the mechanical properties of (PEG/CMC) blends the ultrasonic measurements were performed at these samples, these properties are ultrasonic velocity, compressibility, acoustic impedance and bulk modulus, were made at fixed frequency (f = 25 kHz), another acoustic mechanical properties were measured and calculated at a same time such as the ultrasonic wave amplitude absorption by using oscilloscope, then calculated the absorption coefficient and the transmittance ratio of the sound. It was found that there is significant relationship between ultrasonic velocity and material properties results show that adding PEG effects on the density then on the absorption of the ultrasonic waves inside the blend samples. Finally applied this blend in various concentrations as additive to imported wood glue and found that increasing the adhesion force after adding comparing with pure. FT-IR test has been made.
    Źródło:
    World Scientific News; 2015, 21; 12-23
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Surface initiated ATRP: Synthesis and Characterization of Functional Polymers Grafted on Modified Cellulose Beads
    Autorzy:
    Ashaduzzaman, Md.
    Ishikura, K.
    Sakata, M.
    Kunitake, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/412371.pdf
    Data publikacji:
    2013
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    atom transfer radical polymerization (ATRP)
    cellulose beads
    surface modification
    grafting from
    ionic polymer
    Opis:
    Atom transfer radical polymerization (ATRP) was employed to synthesize novel polymer particles. The surface of porous polymeric cellulose beads was modified by sodium hydroxide, 2-chloromethyloxirane, ethylenediamine and 2-bromo-2-methylpropionyl bromide successively in order to activate the beads surface so that it can play an important role as an initiator for ATRP reaction. ATRP on the modified cellulose beads surface was carried out with styrene and sodium p-styrenesulphonate monomers in the presence of non aqueous and aqueous phases respectively. The polymer products on the substrate surface were characterized by elemental analysis (EA), attenuated total reflectance-infrared (ATR-IR) spectroscopy and carbon13 - nuclear magnetic resonance (13C-NMR).
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2013, 8, 3; 243-248
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Production of Spindle Palm Petiole Fiber Reinforced High Density Polyethyele Composites
    Autorzy:
    Nneka, Ejikeugwu L.
    Monday, Omotioma
    Nnaemeka, Omeje B.
    Uzoma, Eke R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1839868.pdf
    Data publikacji:
    2021
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Spindle palm petiole fiber
    Sodium hydroxide
    cellulose
    chemical composition
    Central Composite Design
    Response Surface Methodology
    tensile strength
    polyethylene
    Opis:
    The work is on the production of spindle palm petiole fiber reinforced high density polyethylene (HDPE) composites. The Spindle Palm Petiole Fiber (SPPF) and HDPE composites were produced using injection molding machine. SPPF were characterized to determine their chemical compositions. Central Composite Design (CCD) was applied as an optimization tool of RSM for cellulose and tensile strength. The chemical composition of the SPPF is cellulose (65%), hemicelluloses (17.1%) and lignin (14.1%). Surface modifications of the fiber enhanced the properties of the fiber. Quadratic model adequately described the relationship between percentage cellulose yield and variables: chemical concentration, mass/volume ratio and time. The cellulose content at optimal level is 60.3% at 3.5wt% concentration, 4g/l mass/volume ratio and time of 16hr. Also for the composite, the quadratic model described the relationship between tensile strength and temperature, fiber/polymer ratio and time. The optimum tensile strength of 42.0 Mpa was obtained at fiber/polymer ratio of 29wt%, temperature of 172 °C and time of 10 min. Water absorbed by the untreated fiber was high compared to the chemically treated fiber. The chemical treatment created a better interfacial bonding of SPPF/HDPE and this could be responsible for the observations.
    Źródło:
    World News of Natural Sciences; 2021, 38; 98-119
    2543-5426
    Pojawia się w:
    World News of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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