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https://www.readbyqxmd.com/read/28342355/pd-nanospheres-decorated-reduced-graphene-oxide-with-multi-functions-highly-efficient-catalytic-reduction-and-ultrasensitive-sensing-of-hazardous-4-nitrophenol-pollutant
#1
A T Ezhil Vilian, Sang Rak Choe, Krishnan Giribabu, Sung-Chan Jang, Changhyun Roh, Yun Suk Huh, Young-Kyu Han
We illustrate a facile approach for in situ synthesis of Pd-gum arabic/reduced graphene oxide (Pd-GA/RGO) using GA as the reducing agent, which favors the instantaneous reduction of both Pd ions and GO into Pd nanoparticles (NPs) and RGO. From the morphological analysis of Pd-GA/RGO, we observed highly dispersed spherical 5nm Pd NPs decorated over RGO. The as-synthesized Pd-GA/RGO composite was employed for the catalytic reduction and the electrochemical detection of 4-nitrophenol (4-NP), respectively. The catalytic reduction of 4-NP was highly pronounced for Pd-GA/RGO (5min) when compared to Pd NPs (140min) and Pd/RGO (36min)...
March 8, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28341993/a-method-for-preparing-silver-nanoparticle-suspensions-in-bulk-for-ecotoxicity-testing-and-ecological-risk-assessment
#2
Jonathan D Martin, Lena Telgmann, Chris D Metcalfe
Methods are needed to prepare stable suspensions of engineered nanoparticles in aqueous matrixes for ecotoxicity testing and ecological risk assessments. We developed a novel method of preparing large volumes of silver nanoparticles (AgNP) in suspension using a commercially available rotor-stator dispersion mill. AgNP in powder form (PVP capped, 30-50 nm) was suspended in deionized water and natural lake water at 1 g/L and the addition of 0.025% (w/v) gum arabic (GA) increased stability over 2 weeks after preparation...
March 24, 2017: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/28331623/gum-arabic-as-novel-anti-oxidant-agent-in-sickle-cell-anemia-phase-ii-trial
#3
Lamis Kaddam, Imad Fadl-Elmula, Omer Ali Eisawi, Haydar Awad Abdelrazig, Mohammed Abdelraman Salih, Florian Lang, Amal M Saeed
BACKGROUND: Sickle cell anemia patients suffer from oxidative stress due to chronic inflammation and self-oxidation of sickle hemoglobin (Hb S). Chronic oxidative stress contributes to endothelial dysfunction, inflammation and multiple organ damage in sickle cell disease (SCD). Thus, antioxidant medication may favorably influence the disease. Gum Arabic (GA), edible, dried, gummy exudates from Acacia Senegal tree, has been claimed to act as an anti-oxidant and cytoprotective agent, protecting against experimental hepatic, renal and cardiac toxicities in rats...
2017: BMC Hematology
https://www.readbyqxmd.com/read/28329408/effects-of-spray-drying-parameters-on-in-vitro-functional-properties-of-camu-camu-myrciaria-dubia-mc-vaugh-a-typical-amazonian-fruit
#4
Alice Fujita, Volnei Brito Souza, Luis Daniel Daza, Carmen Silvia Fávaro-Trindade, Daniel Granato, Maria Inés Genovese
Camu-camu (Myrciaria dubia) fruit is a rich source of bioactive compounds but its shelf life is rather short. Therefore, this study was aimed to evaluate the effect of inlet air temperature (T) and concentration (C) of maltodextrin and arabic gum on the spray-drying process of commercial camu-camu pulps (São Paulo and Manaus). Moisture, solubility, total phenolics (TP), ascorbic acid (AA), and proanthocyanidins (PAC) contents, and in vitro antioxidant capacity of the powders (FRAP, DPPH, Folin-Ciocalteu's reducing capacity were measured)...
March 22, 2017: Journal of Food Science
https://www.readbyqxmd.com/read/28317718/effect-of-coacervation-conditions-on-the-viscoelastic-properties-of-n-o-carboxymethyl-chitosan-gum-arabic-coacervates
#5
Guo-Qing Huang, Yan-Li Du, Jun-Xia Xiao, Guan-Yun Wang
The effects of coacervation acidity, phase separation temperature, ionic strength, and biopolymer ratio on the viscoelasticity of the N,O-carboxymethyl chitosan (NOCC) - gum Arabic (GA) coacervate were investigated by using coacervate yield as the indicator of electrostatic interaction strength. The strongest interaction between NOCC and GA occurred at pH 3.0, whereas the highest modulus values were found in the coacervate separated at pH 6.0. The coacervate yield did not vary with phase separation temperature in the range 4-55°C, but the coacervate viscoelasticity declined as the temperature increased from 25°C to 45°C and then peaked at 55°C...
August 1, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28302485/novel-calcified-gum-arabic-porous-nano-composite-scaffold-for-bone-tissue-regeneration
#6
M Hadavi, S Hasannia, Sh Faghihi, F Mashayekhi, H H Zadeh, S B Mostofi
The aim of this study was to investigate the biomechanical and biological properties of a nanocomposite scaffold containing both mineral and polysaccharide constituents. Hydroxyapatite nanoparticles (n-HA) was synthesized from dead abra ovata shells using wet chemical methods and was used in different ratios in concert with gum Arabic, a branched plant polysaccharide. N-HA/gum nanocomposite was fabricated with freeze-drying process and characterized by FTIR and SEM for chemical structure and morphology. Porosity was estimated using liquid substitution method...
March 14, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28298682/effect-of-spray-drying-on-physical-properties-of-sugarcane-juice-powder-saccharum-officinarum-l
#7
Jyoti Nishad, Cynthia J Selvan, Shabir Ahmad Mir, Sowriappan John Don Bosco
The aim of the present study was to investigate the spray drying behavior of sugarcane juice with (PSJ) and without (CSJ) citric acid the effects of different levels (10-50%) of carrier agents (maltodextrin (MD), Gum Arabic, liquid glucose and carrot fiber) at varying operating conditions of inlet and outlet temperature and feed concentration during spray drying was also studied. Spray dried powders from PSJ and CSJ were analyzed for physical properties such as wettability, cohesiveness, dispersibility, flowability, hygroscopicity, particle morphology etc...
March 2017: Journal of Food Science and Technology
https://www.readbyqxmd.com/read/28298068/gum-arabic-encapsulated-gold-nanoparticles-for-a-non-invasive-photothermal-ablation-of-lung-tumor-in-mice
#8
Amira M Gamal-Eldeen, Dina Moustafa, Sherien M El-Daly, Mona A M Abo-Zeid, Samira Saleh, Menka Khoobchandani, Kavita Katti, Ravi Shukla, Kattesh V Katti
BACKGROUND: In our previous work, we have extensively evaluated the physiochemical characteristics of Gum Arabic-encapsulated gold nanoparticles (GA-AuNPs; 15-18nm) and reported their effectiveness in stopping the tumor initiation via inhibiting the pre-neoplastic lesions in liver. OBJECTIVE: The rationale of this study is to detect the efficiency of using GA-AuNPs in photothermal application as a non-invasive technique against lung tumor. We investigated the cytotoxicity of GA-AuNPs on A549 cells, and then studied their apoptotic, anti-inflammatory, lipid peroxidation and anti-neovascular effect in in vivo model using a chemically-induced lung cancer in mice...
March 11, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28274412/in-vitro-digestion-of-probiotic-bacteria-and-omega-3-oil-co-microencapsulated-in-whey-protein-isolate-gum-arabic-complex-coacervates
#9
Divya Eratte, Kim Dowling, Colin J Barrow, Benu P Adhikari
Solid co-microcapsules of omega-3 rich tuna oil and probiotic bacteria L. casei were produced using whey protein isolate-gum Arabic complex coacervate as wall material. The in-vitro digestibility of the co-microcapsules and microcapsules was studied in terms of survival of L. casei and release of oil in sequential exposure to simulated salivary, gastric and intestinal fluids. Co-microencapsulation significantly increased the survival and surface hydrophobicity and the ability of L. casei to adhere to the intestinal wall...
July 15, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28254315/hybrid-nanomaterials-based-on-gum-arabic-and-magnetite-for-hyperthermia-treatments
#10
M Fernanda Horst, Diego F Coral, Marcela B Fernández van Raap, Mariana Alvarez, Verónica Lassalle
In this study, one-step co-precipitation method was conveniently adapted to obtain novel nanomaterials based on Gum Arabic and magnetite. Two synthesis procedures were evaluated: one employing the solid biopolymer in the co-precipitation media; a second using an aqueous solution of the polysaccharide. An exhaustive characterization of both formulations was performed using several specific techniques. The obtained data confirmed the successful incorporation of the gum Arabic on the magnetic core. Values of hydrodynamic diameters, measured by dynamic light scattering, in aqueous dispersions were about 70-80nm, while sizes lower than 20nm were registered by TEM microscopy...
May 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28242951/gelation-and-thermal-characteristics-of-microwave-extracted-fish-gelatin-natural-gum-composite-gels
#11
P K Binsi, Natasha Nayak, P C Sarkar, C G Joshy, George Ninan, C N Ravishankar
In this study, the gelation and thermal characteristics of microwave extracted fish scale gelatin blended with natural gums such as gum arabic (AG), xanthan gum (XG), guar gum (GG), and tragacanth gum (TG) was evaluated. The nature of interaction and behavior of gelatin in presence of various gums was confirmed by particle size analysis, viscosity profile, FT-IR analysis and turbidity measurements. DSC data revealed that addition of AG, TG and GG remarkably improved the thermal stability of fish gelatin gel...
February 2017: Journal of Food Science and Technology
https://www.readbyqxmd.com/read/28242946/the-effects-of-biomacromolecules-on-the-physical-stability-of-w-o-w-emulsions
#12
Jinlong Li, Yunping Zhu, Chao Teng, Ke Xiong, Ran Yang, Xiuting Li
The effect of bovine serum albumin (BSA), whey protein isolate (WPI), whey protein hydrolysate (WPH), sodium caseinate (SC), carboxymethylcellulose sodium (CMC), fish gelatin (FG), high methoxyl apple pectin (HMAP), low methoxyl apple pectin (LMAP), gum Arabic (GA), ι-carrageenan (CGN), and hydroxypropyl chitosan (HPCTS) on physical stability of internal or external aqueous phase of water-in-oil-in-water (W/O/W) emulsions was evaluated. WPI and CGN in the internal aqueous phase, and GA, HPCTS, and CMC in the external phase reduced the size of emulsion droplets...
February 2017: Journal of Food Science and Technology
https://www.readbyqxmd.com/read/28242920/influence-of-sodium-chloride-treatment-and-polysaccharides-as-debittering-agent-on-the-physicochemical-properties-antioxidant-capacity-and-sensory-characteristics-of-bitter-gourd-momordica-charantia-juice
#13
R Siti Rashima, M Maizura, W M Kang, A Fazilah, L X Tan
The effects of sodium chloride (NaCl) (3.5%) solution and polysaccharides, such as carboxymethyl cellulose (CMC) (0.1, 0.3 and 0.5%) and gum arabic (5, 10 and 15%), on the physicochemical properties, antioxidant capacity and sensory characteristics of bitter gourd juice were investigated. An increase in the concentration of CMC and gum arabic significantly was observed to increase the lightness (L value) and the viscosity (mPas) of bitter gourd juice at all levels. Increased concentrations of gum arabic significantly increased the total soluble solids...
January 2017: Journal of Food Science and Technology
https://www.readbyqxmd.com/read/28196382/bromelain-loading-and-release-from-a-hydrogel-formulated-using-alginate-and-arabic-gum
#14
Janaína Artem Ataide, Letícia Caramori Cefali, Marcia de Araujo Rebelo, Lívia Genovez Spir, Elias Basile Tambourgi, Angela Faustino Jozala, Marco Vinícius Chaud, Edgar Silveira, Xiaochen Gu, Priscila Gava Mazzola
An ideal wound dressing ensures a moist environment around the wound area and absorbs exudates from the wound surface. Topical application of bromelain to incised wounds has been shown to reprogram the wound microenvironment to promote effective tissue repair. Combining the characteristics of hydrogels and bromelain is therefore of great interest. Herein, we describe the development of a hydrogel, formulated using alginate and Arabic gum, for bromelain loading and release. The hydrogel formulation was evaluated using response surface methodology, considering the pH value and the concentration of alginate and Arabic gum...
February 14, 2017: Planta Medica
https://www.readbyqxmd.com/read/28192977/matrix-assisted-laser-desorption-ionization-mass-fingerprinting-for-identification-of-acacia-gum-in-microsamples-from-works-of-art
#15
Clara Granzotto, Ken Sutherland
This paper reports an improved method for the identification of Acacia gum in cultural heritage samples using matrix assisted laser desorption ionization-time-of-flight mass spectrometry (MALDI-TOF MS) after enzymatic digestion of the polysaccharide component. The analytical strategy was optimized using a reference Acacia gum (gum arabic, sp. A. senegal) and provided an unambiguous MS profile of the gum, characterized by specific and recognized oligosaccharides, from as little as 0.1 μg of material. The enhanced experimental approach with reduced detection limit was successfully applied to the analysis of naturally aged (∼80 year) gum arabic samples, pure and mixed with lead white pigment, and allowed the detection of gum arabic in samples from a late painting (1949/1954) by Georges Braque in the collection of the Art Institute of Chicago...
March 7, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28115901/optimization-of-sour-cherry-juice-spray-drying-as%C3%A2-affected-by-carrier-material-and-temperature
#16
Ivona Elez Garofulić, Zoran Zorić, Sandra Pedisić, Verica Dragović-Uzelac
Response surface methodology was applied for optimization of the sour cherry Marasca juice spray drying process with 20, 30 and 40% of carriers maltodextrin with dextrose equivalent (DE) value of 4-7 and 13-17 and gum arabic, at three drying temperatures: 150, 175 and 200 °C. Increase in carrier mass per volume ratio resulted in lower moisture content and powder hygroscopicity, higher bulk density, solubility and product yield. Higher temperatures decreased the moisture content and bulk density of powders...
December 2016: Food Technology and Biotechnology
https://www.readbyqxmd.com/read/28097172/transcript-levels-of-phytoene-desaturase-gene-in-dunaliella-salina-teod-as-affected-by-pbs-nanoparticles-and-light-intensity
#17
Hajar Zamani, Ali Moradshahi
Phytoene synthase (Psy) and Phytoene desaturase (Pds) are the first two regulatory enzymes in the carotenoids biosynthetic pathway. The genes Psy and Pds are under transcriptional control in many photosynthetic organisms. In the present study, using quantitative real time- PCR (qRT-PCR), the effects of uncoated and gum-Arabic coated PbS nanoparticles (GA-coated PbS NPs) and light intensity on the mRNA levels of Pds were investigated. Relative to mRNA level of Pds at 100 µmol photon m-2 s-1 light intensity (control culture), 2...
September 2016: Molecular Biology Research Communications
https://www.readbyqxmd.com/read/28035146/application-of-response-surface-methodology-and-spectroscopic-approach-for-investigating-of-curcumin-nanoencapsulation-using-natural-biopolymers-and-nonionic-surfactant
#18
Shaghayegh Sheikhzadeh, Mohammad Alizadeh, Mahmoud Rezazad, Hamed Hamishehkar
This study aimed at encapsulation of poor water-soluble curcumin so that it could be utilized in various food products as a functional ingredient. Biopolymer nanoparticles were assembled from sodium caseinate and gum arabic using electrostatic complexation in the presence of nonionic surfactant Tween 20. Fourier transform infrared spectroscopy was used to investigate the interactions of curcumin with protein, polysaccharide and surfactant. The effects of sodium caseinate (A), gum arabic (B), Tween 20 (C) and pH (D) on responses were studied using a three-level four-factor Box-Behnken design...
November 2016: Journal of Food Science and Technology
https://www.readbyqxmd.com/read/28017999/encapsulation-of-antioxidant-peptide-enriched-casein-hydrolysate-using-maltodextrin-gum-arabic-blend
#19
Priyanka Singh Rao, Rajesh Kumar Bajaj, Bimlesh Mann, Sumit Arora, S K Tomar
Antioxidant peptide enriched casein hydrolysate (AO-CH) are receiving increasing attention due to their potential as functional ingredient. Encapsulation of AO-CH using maltodextrin-gum arabic (MD/GA) as wall material could represent an attractive approach to overcome the problems related to their direct application. Encapsulation parameter were optimized using different ratio of core to coat and proportion of coating material (10:0, 8:2, 6:4) under varying pH (2-8) for encapsulation efficiency (EE).The preparation P3 resulted in maximum EE (87%) using core to coat ratio 1:20, at pH 6...
October 2016: Journal of Food Science and Technology
https://www.readbyqxmd.com/read/27987876/effect-of-glycosylation-with-gum-arabic-by-maillard-reaction-in-a-liquid-system-on-the-emulsifying-properties-of-canola-protein-isolate
#20
Safoura Pirestani, Ali Nasirpour, Javad Keramat, Stéphane Desobry, Jordane Jasniewski
In this research, the improvement of emulsifying properties of chemically modified canola protein isolate (CPI) with gum Arabic (GA) through Maillard reaction under natural pH at 90°C was investigated. The stability, rheology and morphology of oil-in-water emulsions stabilized by conjugate of two biopolymers were evaluated by determination of droplet size, emulsifying activity (EAI), emulsifying stability (ESI) and creaming indices. The conjugate-stabilized emulsion showed smaller mean droplet size and lower creaming index values which were more effective to stabilize the emulsion compared to CPI and mixture of two biopolymers especially if pH was near the isoelectric point of CPI or when emulsions heated from 30 to 90°C...
February 10, 2017: Carbohydrate Polymers
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