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https://www.readbyqxmd.com/read/28918245/biodiesel-production-from-lipid-of-carbon-dioxide-sequestrating-bacterium-and-lipase-of-psychrotolerant-pseudomonas-sp-istpl3-immobilized-on-biochar
#1
Khushboo Khosla, Rashmi Rathour, Raj Maurya, Neha Maheshwari, Edgard Gnansounou, Christian Larroche, Indu Shekhar Thakur
An extracellular lipase was purified and characterized from psychrotolerant bacterium Pseudomonas sp. ISTPL3 isolated from Pangong lake. Lipase was purified by sequential methods of ammonium sulphate precipitation, dialysis, DEAE-cellulose ion exchange chromatography and Sephadex G-100 gel filtration chromatography, resulting in a purification fold of 6.53 and yield of 5.45%. The molecular weight was approximately 31kDa. The purified lipase was used for transesterification of lipids produced by oleaginous chemolithotrophic bacterium Serratia sp...
September 1, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28917929/development-of-carboxymethyl-cellulose-chitosan-hybrid-micro-and-macroparticles-for-encapsulation-of-probiotic-bacteria
#2
P Singh, B Medronho, L Alves, G J da Silva, M G Miguel, B Lindman
Novel carboxymethyl cellulose-chitosan (CMC-Cht) hybrid micro- and macroparticles were successfully prepared in aqueous media either by drop-wise addition or via nozzle-spray methods. The systems were either physically or chemically crosslinked using genipin as the reticulation agent. The macroparticles (ca. 2mm) formed are found to be essentially of the core-shell type, while the microparticles (ca. 5μm) are apparently homogeneous. The crosslinked particles are robust, thermally resistant and less sensitive to pH changes...
November 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28917927/utilizing-cellulose-sheets-as-structure-promoter-constructing-different-micro-nano-titanate-nanotubes-networks-for-green-water-purification
#3
Lulu Xu, Ye Xiong, Baokang Dang, Chao Wang, Chunde Jin, Qingfeng Sun, Xiaochun Zhang
In this work, we provide a novel strategy of constructing different micro-nano structure (arrayed, multilevel, flower-like) titanate nanotubes (TNTs) networks with cellulose sheets as structure promoter. Through cellulose self-locking and inter-locking, several micro-nano TNTs networks with higher specific surface area are obtained and applied to toxic heavy metal Pb(2+) cations removal. It not only makes abundant toxic Pb(2+) ions exchange with the inter-layer Na(+) ions of TNTs, but also allows many Pb(2+) ions to be deposited onto the TNTs surface...
November 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28917921/effect-of-oxidized-chitin-nanocrystals-isolated-by-ammonium-persulfate-method-on-the-properties-of-carboxymethyl-cellulose-based-films
#4
Ahmed A Oun, Jong-Whan Rhim
Oxidized chitin nanocrystals (ChNCs) were isolated from crab shell chitin using ammonium persulfate (APS) method. The oxidized ChNCs were in needle shape with a diameter of 15nm, the length of 400-500nm, and crystallinity index of 93.5%. Carboxymethyl cellulose (CMC)-based films reinforced with the ChNCs (0, 1, 5, and 10wt.%) were flexible and transparent. The mechanical strength of the CMC film increased significantly (p<0.05) after blending with the ChNCs. The tensile strength (TS) and elastic modulus (EM) increased by 88% and 243% when 10wt...
November 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28917920/one-step-hydrothermal-synthesis-of-fluorescent-nanocrystalline-cellulose-carbon-dot-hydrogels
#5
Wei Li, Sichun Wang, Ying Li, Chunhui Ma, Zhanhua Huang, Chunsheng Wang, Jian Li, Zhijun Chen, Shouxin Liu
Fluorescent nanocrystalline cellulose/carbon dots (NCC/CDs) hydrogels were successfully prepared by a facile one-step green hydrothermal carbonization process. The properties of NCC/CDs hydrogels prepared at different temperatures were investigated by fluorescence spectroscopy, transmission electron microscopy, nuclear magnetic resonance spectroscopy, X-ray diffraction, and thermogravimetric analysis. NCC/CDs hydrogels with high crystallinity, high thermal stability, and excellent fluorescence properties can be obtained by controlling the hydrothermal treatment temperature...
November 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28917917/characterization-of-structural-cell-wall-polysaccharides-in-cattail-typha-latifolia-evaluation-as-potential-biofuel-feedstock
#6
Diego Rebaque, Romina Martínez-Rubio, Silvia Fornalé, Penélope García-Angulo, Ana Alonso-Simón, Jesús M Álvarez, David Caparros-Ruiz, José L Acebes, Antonio Encina
Second generation bioethanol produced from lignocellulosic biomass is attracting attention as an alternative energy source. In this study, a detailed knowledge of the composition and structure of common cattail (Typha latifolia L.) cell wall polysaccharides, obtained from stem or leaves, has been conducted using a wide set of techniques to evaluate this species as a potential bioethanol feedstock. Our results showed that common cattail cellulose content was high for plants in the order Poales and was accompanied by a small amount of cross-linked polysaccharides...
November 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28917908/structural-elucidation-of-the-main-water-soluble-polysaccharide-from-rubus-anatolicus-roots
#7
Neda Sahragard, Kambiz Jahanbin
An acidic heteropolysaccharide, RAPS-1, was isolated from the roots of Rubus anatolicus by water extraction (70°C) and purification using DEAE-cellulose A52 and Sephadex G-100 column chromatography. The total sugar content and specific optical rotation of RAPS-1 were 96.3% and +196°, respectively. RAPS-1 had a molecular weight of 7900Da, and was composed of glucose, galactose, and glucuronic acid with a relative molar ratio of 6.2: 1.0: 1.2. Structural features of RAPS-1 were elucidated by a combination of partial acid hydrolysis, periodate oxidation and Smith degradation, methylation, GC-MS, FTIR, and NMR ((13)C and (1)H) analysis...
November 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28917898/physicochemical-characterization-antioxidant-activity-of-polysaccharides-from-mesona-chinensis-benth-and-their-protective-effect-on-injured-nctc-1469-cells-induced-by-h2o2
#8
Wei Tang, Mingyue Shen, Jianhua Xie, Dan Liu, Mengxia Du, Lihua Lin, He Gao, Bruce R Hamaker, Mingyong Xie
Polysaccharides MP-A, MP-U and MP-C were extracted from Mesona chinensis Benth by hot-alkali extraction (HAE), ultrasonic-assisted extraction (UAE) and cellulose-enzyme assisted extraction (CAE), respectively. The yields, physicochemical properties and antioxidant of polysaccharides were investigated. Results showed that the yields of MP-A (11.14%), MP-U (10.62%) and MP-C (9.70%) were similar, and they were all heteropolysaccharides with average molecular weights of 1.9×10(5)Da, 1.5×10(5)Da, 1.4×10(5)Da...
November 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28917896/environmental-and-technical-feasibility-of-cellulose-nanocrystal-manufacturing-from-sugarcane-bagasse
#9
Rosineide Miranda Leão, Patrícia Câmara Miléo, João M L L Maia, Sandra Maria Luz
The environmental and technical feasibility of cellulose nanocrystal production from sugarcane bagasse fibers was evaluated. First, the life cycle assessment (LCA) is presented as a methodology to investigate the most feasible form of obtainment. The environmental impacts regarding climate change and water footprint were evaluated considering a gate-to-gate process and a functional unit of 1kg. The inventory data encompassed sugarcane plantation and pretreatment, bleaching and hydrolysis for bagasse generation...
November 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28917889/fabrication-of-cellulose-nanocrystal-from-carex-meyeriana-kunth-and-its-application-in-the-adsorption-of-methylene-blue
#10
Xue Yang, Hui Liu, Fuyi Han, Shuai Jiang, Lifang Liu, Zhaopeng Xia
Cellulose nanocrystal (CNC) was extracted from Carex meyeriana Kunth (CMK) by a combination of TEMPO oxidation and mechanical homogenization method, and used to remove methylene blue (MB) from aqueous solution. After alkali-oxygen treatment, the aqueous biphasic system (polyethylene glycol/inorganic salt) was applied to further remove lignin from CMK. The characteriazation of CNC, and the effects of H2O2 dosage, CNC dosage, adsorption time, and initial MB concentration on the MB removal capacity of CNC were investigated...
November 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28917888/structure-of-cellulose-microfibrils-in-mature-cotton-fibres
#11
Marta Martínez-Sanz, Filomena Pettolino, Bernadine Flanagan, Michael J Gidley, Elliot P Gilbert
The structure of cellulose microfibrils in mature cotton fibres from three varieties - Gossypium hirsutum, G. barbadense and G. arboreum - has been investigated by a multi-technique approach combining small angle scattering techniques with spectroscopy and diffraction. Cellulose microfibrils present a Iβ-rich crystalline structure with limited surface disorder. Small angle scattering (SAXS and SANS) data have been successfully fitted using a core-shell model and the results obtained indicate that the cellulose microfibrils, formed by the association of 2-3 elementary fibrils, are composed of a ca...
November 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28917886/hydrogen-bonds-and-twist-in-cellulose-microfibrils
#12
Sridhar Kumar Kannam, Daniel P Oehme, Monika S Doblin, Michael J Gidley, Antony Bacic, Matthew T Downton
There is increasing experimental and computational evidence that cellulose microfibrils can exist in a stable twisted form. In this study, atomistic molecular dynamics (MD) simulations are performed to investigate the importance of intrachain hydrogen bonds on the twist in cellulose microfibrils. We systematically enforce or block the formation of these intrachain hydrogen bonds by either constraining dihedral angles or manipulating charges. For the majority of simulations a consistent right handed twist is observed...
November 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28917885/magnetic-cellulose-nanocrystal-nanocomposites-for-the-development-of-green-functional-materials
#13
E Lizundia, A Maceiras, J L Vilas, P Martins, S Lanceros-Mendez
A magnetic cellulosic material composed of cellulose nanocrystals (CNC) and cobalt ferrite (CoFe2O4) nanoparticles was developed through evaporation-induced self-assembly (EISA). Nanoparticles demonstrated good dispersibility within the cellulose nanocrystal template. The addition of glucose to CNC network allows the development of homogeneous crack-free CNC-based films and does no modify neither the morphology nor the optical properties. In contrast, the introduction of CoFe2O4 nanoparticles produces a marked decrease in the amount of the transmitted light...
November 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28917883/green-cellulose-based-nanocomposite-catalyst-design-and-facile-performance-in-aqueous-synthesis-of-pyranopyrimidines-and-pyrazolopyranopyrimidines
#14
Ali Maleki, Abbas Ali Jafari, Somayeh Yousefi
A cellulose-based nanobiocomposite decorated with Fe3O4 nanoparticles was prepared, characterized and applied as an easily recoverable and reusable green nanocatalyst in the synthesis of pyrano[2,3-d]pyrimidine derivatives in water at room temperature. The characterization was performed by using a variety of conventional analytical instruments such as Fourier transform infrared spectra (FT-IR), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), energy dispersive X-ray (EDX), vibrating sample magnetometer (VSM), thermal analysis (TGA/DTA) and inductively coupled plasma atomic emission spectroscopy (ICP-AES) analyses...
November 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28917878/cellulose-nanocrystals-from-passion-fruit-peels-waste-as-antibiotic-drug-carrier
#15
Christian J Wijaya, Stephanie N Saputra, Felycia E Soetaredjo, Jindrayani N Putro, Chun X Lin, Alfin Kurniawan, Yi-Hsu Ju, Suryadi Ismadji
Due to its excellent chemical and physical properties, cellulose nanocrystals (CNC) possess many potential advanced functional applications. In this study, CNC was extracted from natural product by hydrolyzing cellulose segment of passionfruit peels using sulphuric acid solution. The capability of CNC as drug carrier was tested toward tetracycline antibiotic. The drug loading processes were carried out at various pH (3-7) with the optimum uptake of tetracycline achieved at pH 3. The in vitro release of tetracycline drug was carried out in phosphoric buffer medium with two different pH conditions at 37°C...
November 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28917873/bionanocomposites-produced-from-cassava-starch-and-oil-palm-mesocarp-cellulose-nanowhiskers
#16
Adriana de Campos, Alfredo R de Sena Neto, Vanessa B Rodrigues, Bruno R Luchesi, Francys K V Moreira, Ana Carolina Correa, Luiz H C Mattoso, José M Marconcini
Cassava starch films reinforced with cellulose nanowhiskers from oil palm mesocarp fibers were produced by casting. Nanowhiskers were obtained by sulphuric acid hydrolysis followed by microfluidization and incorporated in starch films at various loadings (1-10wt%). Morphological and mechanical characterizations showed that the reinforcing effect of oil palm cellulose nanowhiskers was significant at loadings of up to 6wt%, which was determined to be the nanowhiskers percolation threshold. Above this content, formation of agglomerates became more significant, causing a decrease in mechanical properties of starch bionanocomposites...
November 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28917870/ultra-high-pressure-modified-cellulosic-fibres-with-antimicrobial-properties
#17
Ana M Salgueiro, Mauro D Santos, Jorge A Saraiva, Filipe Almeida, Isabel Sousa, João Tedim, Helena I S Nogueira, Dmitry V Evtuguin
In this work bleached E. globulus kraft pulp was doped with polyhexamethylene biguanide (PHMB) from an aqueous solution or from a suspension of silica capsules (PHMB@silica) by impregnation under atmospheric or ultra-high pressure (UHP) conditions (500MPa). The antimicrobial properties of pulps were evaluated towards gram-negative E. coli and gram-positive L. innocua bacteria. PHMB loads below 500mg per kg of pulp revealed negligible bacteriostatic properties, whereas PHMB loads of ca 3000-4000mg per kg demonstrated bactericidal properties of pulp without significant deterioration of its mechanical strength...
November 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28917869/high-aspect-ratio-phospho-calcified-rock-candy-like-cellulose-nanowhiskers-of-wastepaper-applicable-in-osteogenic-differentiation-of-hmscs
#18
Mohsen Shahrousvand, Fatemeh Ahmadi Tabar, Ehsan Shahrousvand, Amir Babaei, Mohammad Mahdi Hasani-Sadrabadi, Gity Mir Mohamad Sadeghi, Hafez Jafari, Ali Salimi
The aim of this study was to prepare cellulose nanowhiskers (CNWs) from wastepaper powder (WPP), as an environmentally friendly approach for obtaining the source material, which is a highly available and low-cost precursor for cellulose nanomaterial processing. Acid hydrolysis and calcification treatments were employed for extraction of CNWs and preparation of novel phospho-calcified cellulose nanowhiskers (PCCNWs). CNWs and PCCNWs were analyzed through optical microscopy (OM), scanning electron microscopy (SEM), Fourier-transformed infrared spectra (FTIR) and X-ray diffraction analysis (XRD)...
November 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28917867/nanocrystalline-cellulose-isolated-from-discarded-cigarette-filters
#19
Segun A Ogundare, Vashen Moodley, Werner E van Zyl
We report the isolation of nanocrystalline cellulose (NCC) produced from discarded cigarette filters (DCF). The DCF were processed into cellulose via ethanolic extraction, hypochlorite bleaching, alkaline deacetylation, and then converted into NCC by sulfuric acid hydrolysis. The morphological structures of the isolated NCC established with TEM showed that the nanocrystals were needle-like with a mean length of 143nm. FEGSEM showed the morphological transition of the micro-sized DCF to self-assembled NCC while EDX revealed the presence of Ti (as TiO2) in DCF, which was retained in the NCC...
November 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28917863/purification-characterization-and-biological-effect-of-reversing-the-kidney-yang-deficiency-of-polysaccharides-from-semen-cuscutae
#20
Song Yang, Xinfang Xu, Hefang Xu, Shuya Xu, Qinghua Lin, Zhe Jia, Ting Han, Hui Zhang, Ying Zhang, Huan Liu, Yan Gao, Xiangri Li
Semen cuscutae is a well-known Chinese medicine which has been used to nourish kidney. It is the first study to demonstrate that the polysaccharides from semen cuscutae showed significant activity of nourishing kidney-yang by increasing the levels of testosterone and estradiol, decreasing the level of blood urea nitrogen, improving immune function, possessing antioxidant effect. Three homogeneous polysaccharides were obtained by DEAE-cellulose and Sephacryl S-400 which were named as C-7WR1, C-7WR2 and C-7WR3 with average molecular weight of 7...
November 1, 2017: Carbohydrate Polymers
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