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https://www.readbyqxmd.com/read/27884087/a-protease-peptidase-from-culture-medium-of-flammulina-velutipes-that-acts-on-arabinogalactan-protein
#1
Yoshihisa Yoshimi, Yumi Sugawara, Chiaki Hori, Kiyohiko Igarashi, Satoshi Kaneko, Yoichi Tsumuraya, Toshihisa Kotake
Arabinogalactan-proteins (AGPs) are highly diverse plant proteoglycans found on the plant cell surface. AGPs have large arabinogalactan (AG) moieties attached to a core-protein rich in hydroxyproline (Hyp). The AG undergoes hydrolysis by various glycoside hydrolases, most of which have been identified, whereas the core-proteins is presumably degraded by unknown proteases/peptidases secreted from fungi and bacteria in nature. Although several enzymes hydrolyzing other Hyp-rich proteins are known, the enzymes acting on the core-proteins of AGPs remain to be identified...
November 25, 2016: Bioscience, Biotechnology, and Biochemistry
https://www.readbyqxmd.com/read/27842837/synthesis-characterization-and-modification-of-gum-arabic-microgels-for-hemocompatibility-and-antimicrobial-studies
#2
Muhammad Farooq, Selin Sagbas, Mehtap Sahiner, Mohammad Siddiq, Mustafa Turk, Nahit Aktas, Nurettin Sahiner
Gum Arabic (GA) microgels were successfully prepared via reverse micellization method with high yield (78.5±5.0%) in 5-100μm size range using divinyl sulfone (DVS) as a crosslinker. The GA microgels were degraded hydrolytically 22.8±3.5% at pH 1 in 20days, whereas no degradation was observed at pH 7.4 and pH 9 at 37°C. By using diethylenetriamine (DETA), and taurine (TA) as chemical modifying agents, GA microgels were chemically modified as GA-DETA and GA-TA, and the zeta potential values of 5.2±4.1 and -24...
January 20, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/27799433/organic-dyes-in-illuminated-manuscripts-a-unique-cultural-and-historic-record
#3
Maria João Melo, Paula Nabais, Maria Guimarães, Rita Araújo, Rita Castro, Maria Conceição Oliveira, Isabella Whitworth
In this study, we successfully addressed the challenges posed by the identification of dyes in medieval illuminations. Brazilwood pigment lakes and orcein purple colours were unequivocally identified in illuminated manuscripts dated by art historians to be from the thirteenth to the fifteenth centuries and in the Fernão Vaz Dourado Atlas (sixteenth century). All three works were on a parchment support. This was possible by combining Raman microscopy and surface-enhanced Raman spectroscopy with microspectrofluorimetry...
December 13, 2016: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/27770683/effect-of-nanomaterial-and-media-physicochemical-properties-on-ag-nm-aggregation-kinetics
#4
Kamelia Afshinnia, Mithun Sikder, Bo Cai, Mohammed Baalousha
Nanomaterial (NM) aggregation is a key process determining their environmental, fate behavior and effects. Nanomaterials are typically engineered to remain kinetically stable; however, in environmental and toxicological media, NMs are prone to aggregation. The aggregation kinetics of NM is typically quantified by measuring their attachment efficiency (α) and critical coagulation concentration (CCC). Several studies measured α and CCC for Ag NMs with a major focus on investigating the effects of ionic strength, ion valency and natural organic matter, with few studies investigating other environmental factors such as light and dissolved oxygen and none investigating the effect of particle size, buffer type and concentration, or surface coverage by capping agent...
October 17, 2016: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/27765212/structural-and-oxidative-stabilization-of-spray-dried-fish-oil-microencapsulates-with-gum-arabic-and-sage-polyphenols-characterization-and-release-kinetics
#5
P K Binsi, Natasha Nayak, P C Sarkar, A Jeyakumari, P Muhamed Ashraf, George Ninan, C N Ravishankar
The synergistic efficacy of gum arabic and sage polyphenols in stabilising capsule wall and protecting fish oil encapsulates from heat induced disruption and oxidative deterioration during spray drying was assessed. The emulsions prepared with sodium caseinate as wall polymer, gum arabic as wall co-polymer and sage extract as wall stabiliser was spray dried using a single fluid nozzle. Fish oil encapsulates stabilised with gum arabic and sage extract (SOE) exhibited significantly higher encapsulation efficiency compared to encapsulates containing gum arabic alone (FOE)...
March 15, 2017: Food Chemistry
https://www.readbyqxmd.com/read/27720817/microencapsulation-of-grape-polyphenols-using-maltodextrin-and-gum-arabic-as-two-alternative-coating-materials-development-and-characterization
#6
Aysu Tolun, Zeynep Altintas, Nevzat Artik
Phenolic compounds obtained from fruits have recently gained a great attention due to their bioactive roles. However, they are sensitive and they can be easily affected by physicochemical factors that create a great challenge to incorporate them into the food products. Hence, this work aimed to investigate microencapsulation of these compounds to provide a solution for this problem by improving their stability and protecting them against oxidation, light, moisture and temperature. A lab scale spray-dryer was chosen to produce microcapsules of polyphenols using different dextrose equivalents of maltodextrin and gum arabic as a coating material...
October 5, 2016: Journal of Biotechnology
https://www.readbyqxmd.com/read/27702513/novel-reverse-osmosis-membranes-composed-of-modified-pva-gum-arabic-conjugates-biofouling-mitigation-and-chlorine-resistance-enhancement
#7
Wail Falath, Aneela Sabir, Karl I Jacob
A novel crosslinked Poly (vinyl alcohol) (PVA) reverse osmosis (RO) thin film membrane conjugated with Gum Arabic (GA) with superb performance and features was synthesized for water desalination. RO membrane desalination parameters, such as hydrophilicity, surface roughness, water permeability, salt rejection, Chlorine resistance and biofouling resistance were evaluated using a dead end RO filtration unit. The incorporation of Pluronic F127 and the conjugation of Gum Arabic improved the overall RO performance of the membranes...
January 2, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/27702505/preparation-of-chemically-modified-canola-protein-isolate-with-gum-arabic-by-means-of-maillard-reaction-under-wet-heating-conditions
#8
Safoura Pirestani, Ali Nasirpour, Javad Keramat, Stéphane Desobry
The aim of this study was to produce covalently attached conjugate between canola protein isolate (CPI) and gum Arabic (GA) in aqueous solutions via the Maillard reaction at 90°C in a model system consisting of 2% CPI and 1, 2 or 4% GA. Upon decreasing of free amino group content in the glycosylated CPI to 72%, a new band near the loading end of sodium dodecyl sulfate-polyacrylamide gel electrophoresis and a shift of CPI peak in high performance size exclusion chromatography confirmed that the covalent attachment of CPI to GA was successful...
January 2, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/27637451/polysaccharide-type-and-concentration-affect-nanocomplex-formation-in-associative-mixture-with-%C3%AE-lactoglobulin
#9
Seyed Mohammad Hashem Hosseini, Zahra Emam-Djomeh, Manizhe Negahdarifar, Marziyeh Sepeidnameh, Seyed Hadi Razavi, Paul Van der Meeren
The main objective of this work was to investigate the effects of polysaccharide type (gum Arabic, GA and/or carboxymethyl cellulose, CMC) and concentration (0-0.2% (w/w)) on the electrostatic interactions with β-lactoglobulin (BLG). Biopolymer interaction was studied using turbidimetric analysis, dynamic light scattering (DLS), electrophoretic mobility and relative viscosity measurements. Complexes were developed at pH values below the isoelectric point (pI) of BLG. Increasing polysaccharide concentration increased the stability of nanocomplexes through increasing the negative charges carried by complexes...
September 13, 2016: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/27608543/assessment-of-physical-and-structural-characteristics-of-almond-gum
#10
Mudasir Bashir, Sundaramoorthy Haripriya
Almond gum was investigated for its physical and structural characteristics in comparison to gum arabic. Among physical properties, bulk density was found to be 0.600±0.12g/mL and 0.502±0.20g/mL for almond and gum arabic respectively. Almond gum (0.820±0.13g/mL) displayed the maximum value for tapped density. Compressibility index of exudate gum powders varied from 26.79±1.47 to 37.46±0.50% and follow the order gum arabic>almond gum. Almond gum demonstrated good flow characteristics when compared to gum arabic...
September 5, 2016: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/27570276/microencapsulation-by-spray-drying-of-bioactive-compounds-extracted-from-blackberry-rubus-fruticosus
#11
Renata Trindade Rigon, Caciano P Zapata Noreña
Blackberry aqueous extract acidified with 2 % citric acid was spray-dried using gum Arabic (GA) and polydextrose (PD) as encapsulating agents at concentrations of 10 and 15 % and temperatures of 140 to 160 °C. All powders presented high solubility, ranging from 88.2 to 97.4 %, and the encapsulation conditions did not significantly affect the hygroscopicity. The powders produced with gum Arabic showed higher brightness than those with polydextrose. The anthocyanins retention in the microcapsules was 878...
March 2016: Journal of Food Science and Technology
https://www.readbyqxmd.com/read/27570268/efficacy-of-ginger-oil-and-extract-combined-with-gum-arabic-on-anthracnose-and-quality-of-papaya-fruit-during-cold-storage
#12
Asgar Ali, Goh Kar Hei, Yeoh Wei Keat
Effect of 2.0 % ginger oil (GO) and 1.5 % ginger extract (GE) in combination with 10.0 % gum arabic (GA) was evaluated for the postharvest control of anthracnose and maintaining quality of Eksotika II papaya fruit during storage at 12 ± 1 °C and 80-85 % RH. Antifungal compounds present in GO and GE were analyzed using gas chromatography and GO was found to contain α-pinene, 1, 8-cineole and borneol, while only borneol was present in GE due to different extraction methods applied. The highest antifungal activity was shown in 2...
March 2016: Journal of Food Science and Technology
https://www.readbyqxmd.com/read/27561504/effects-of-different-polysaccharides-on-the-formation-of-egg-yolk-ldl-complex-nanogels-for-nutrient-delivery
#13
Mingyong Zhou, Qiaobin Hu, Taoran Wang, Jingyi Xue, Yangchao Luo
Five polysaccharides, pectin, carboxymethyl cellulose (CMC), gum arabic, carrageenan and alginate, were studied to form complex nanogels with egg yolk low density lipoprotein (LDL). All nanogels were smaller than 85nm with high negative zeta potential, while LDL/carrageenan and LDL/alginate nanogels exhibited more heterogeneous size distribution. Fourier transform infrared spectrum suggested that hydrogen bonds, hydrophobic and electrostatic interactions were involved to form nanogels. Overall, significant expansion of nanogels was observed after encapsulation of curcumin, being studied as a model lipophilic nutrient...
November 20, 2016: Carbohydrate Polymers
https://www.readbyqxmd.com/read/27535403/value-added-product-recovery-from-sludge-generated-during-gum-arabic-refining-process-by-vermicomposting
#14
Veena Das, Sanjeev Satyanarayan, Shanta Satyanarayan
Gum arabic is multifunctional and used in food products, pharmaceutical, confectionery, cosmetic, printing and textile industry. Gum arabic has an excellent market and its production is being increased to meet the market demand. In the process, huge quantity of solid waste is generated during its refining process. An attempt has been made to vermicompost this organic waste using Eudrilus eugeniae. This research work is first of its kind. Literature on this substrate has not been reported anywhere else for vermicomposting...
December 0: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/27533849/photothermal-therapy-mediated-by-gum-arabic-conjugated-gold-nanoparticles-suppresses-liver-preneoplastic-lesions-in-mice
#15
Amira M Gamal-Eldeen, Dina Moustafa, Sherien M El-Daly, Enas A El-Hussieny, Samira Saleh, Menka Khoobchandani, Kathryn L Bacon, Sagar Gupta, Kavita Katti, Ravi Shukla, Kattesh V Katti
This study validates the utility of Gum Arabic-conjugated gold nanoparticles (GA-AuNPs) and laser to induce photothermal inhibition of hepatocarcinogenesis, via employing a diethylnitrosamine (DEN)-mediated hepatocellular carcinoma model. This work included both of in vitro and in vivo studies; to investigate the GA-AuNPs cytotoxicity and phototoxicity in hepatic cell line; to delineate the GA-AuNPs therapeutic efficiency in DEN-induced preneoplastic lesions (PNLs) in the liver of Balb-C mice. The therapeutic effects of GA-AuNPs on the mediators of apoptosis, inflammation, and tumor initiation, as well as the histopathological changes in preneoplastic liver have been investigated...
October 2016: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/27516295/surface-interactions-of-gold-nanorods-and-polysaccharides-from-clusters-to-individual-nanoparticles
#16
Heloise Ribeiro de Barros, Leandro Piovan, Guilherme L Sassaki, Diego de Araujo Sabry, Ney Mattoso, Ábner Magalhães Nunes, Mario R Meneghetti, Izabel C Riegel-Vidotti
Gold nanorods (AuNRs) are suitable for constructing self-assembled structures for the development of biosensing devices and are usually obtained in the presence of cetyltrimethylammonium bromide (CTAB). Here, a sulfated chitosan (ChiS) and gum arabic (GA) were employed to encapsulate CTAB/AuNRs with the purpose of studying the interactions of the polysaccharides with CTAB, which is cytotoxic and is responsible for the instability of nanoparticles in buffer solutions. The presence of a variety of functional groups such as the sulfate groups in ChiS and the carboxylic groups in GA, led to efficient interactions with CTAB/AuNRs as evidenced through UV-vis and FTIR spectroscopies...
November 5, 2016: Carbohydrate Polymers
https://www.readbyqxmd.com/read/27478215/quality-evaluation-of-peony-seed-oil-spray-dried-in-different-combinations-of-wall-materials-during-encapsulation-and-storage
#17
Yan Shi, Shu-Jie Wang, Zong-Cai Tu, Hui Wang, Ru-Yi Li, Lu Zhang, Tao Huang, Ting Su, Cui Li
This study aimed at evaluating the performance of peony seed oil microencapsulated by spray drying during encapsulation and storage. Four different combinations of gum arabic (GA), corn syrup (CS), whey protein concentrate (WPC) and sodium caseinate (CAS) were used to encapsulate peony seed oil. The best encapsulation efficiency was obtained for CAS/CS followed by the CAS/GA/CS combination with the encapsulation ratio of 93.71 and 92.80 %, respectively, while the lowest encapsulation efficiency was obtained for WPC/GA/CS (85...
June 2016: Journal of Food Science and Technology
https://www.readbyqxmd.com/read/27475234/formation-of-redispersible-polyelectrolyte-complex-nanoparticles-from-gallic-acid-chitosan-conjugate-and-gum-arabic
#18
Qiaobin Hu, Taoran Wang, Mingyong Zhou, Jingyi Xue, Yangchao Luo
Polyelectrolyte complex (PEC) nanoparticles between chitosan (CS) and biomacromolecules offer better physicochemical properties as delivery vehicles for nutrients than other CS-based nanoparticles. Our major objective was to fabricate PEC nanoparticles between water soluble gallic acid-chitosan conjugate (GA-CS) and gum arabic. The optimal fabrication method, physicochemical characteristics and stability were investigated. Furthermore, we also evaluated the effects of nano spray drying technology on the morphology and redispersibility of nanoparticle powders using Buchi B-90 Nano Spray Dryer...
November 2016: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/27472453/polymer-associated-liposomes-for-the-oral-delivery-of-grape-pomace-extract
#19
Maria Manconi, Francesca Marongiu, Ines Castangia, Maria Letizia Manca, Carla Caddeo, Carlo Ignazio Giovanni Tuberoso, Guy D'hallewin, Gianluigi Bacchetta, Anna Maria Fadda
The pomaces from red grapes were used as a source of phenolic antioxidants, which are known to have health-promoting effects. Environmentally-friendly extraction strategies were investigated to improve the rate and recovery of an extract with high phenolic content and antioxidant activity, which were evaluated by the Folin-Ciocalteu, DPPH, ABTS(+), CUPRAC and FRAP assays. The extract was incorporated in liposomes, which were stabilized by the addition of a natural polysaccharide, sodium alginate or arabic gum, widely used in pharmaceutical and food industries as thickeners and stabilizers...
October 1, 2016: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/27472310/green-tea-leaves-extract-microencapsulation-physicochemical-and-storage-stability-study
#20
James A Zokti, Badlishah Sham Baharin, Abdulkarim Sabo Mohammed, Faridah Abas
Green tea polyphenols have been reported to possess many biological properties. Despite the many potential benefits of green tea extracts, their sensitivity to high temperature, pH and oxygen is a major disadvantage hindering their effective utilization in the food industry. Green tea leaves from the Cameron Highlands Malaysia were extracted using supercritical fluid extraction (SFE). To improve the stability, green tea extracts were encapsulated by spray-drying using different carrier materials including maltodextrin (MD), gum arabic (GA) and chitosan (CTS) and their combinations at different ratios...
2016: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
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