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https://www.readbyqxmd.com/read/29334407/chiral-separation-of-novel-iminonaringenin-derivatives
#1
Meriem Bouanini, Nasser Belboukhari, J Carlos Menéndez, Khaled Sekkoum, Abdelkarim Cheriti, Hassan Y Aboul-Enein
A series of 4-iminonaringenin derivatives 2-6 have been prepared in good overall yields from a condensation reaction between naringenin and primary amines. The structures of all products were confirmed by ultraviolet, infrared, proton nuclear magnetic resonance, and carbon-13 nuclear magnetic resonance spectroscopic techniques. These derivatives were analyzed by high-performance liquid chromatography using polysaccharide-based chiral stationary phases, namely, Chiralpak IB and Chiralcel OD, using various mobile phases...
January 15, 2018: Chirality
https://www.readbyqxmd.com/read/29334321/biosynthesis-of-galactomannans-found-in-filamentous-fungi-belonging-to-pezizomycotina
#2
Takuji Oka
The galactomannans (GMs) that are produced by filamentous fungi belonging to Pezizomycotina, many of which are pathogenic for animals and plants, are polysaccharides consisting of α-(1→2)-/α-(1→6)-mannosyl and β-(1→5)-/β-(1→6)-galactofuranosyl residues. GMs are located at the outermost layer of the cell wall. When a pathogenic fungus infects a host, its cell surface must be in contact with the host. The GMs on the cell surface may be involved in the infection mechanism of a pathogenic fungus or the defense mechanism of a host...
January 15, 2018: Bioscience, Biotechnology, and Biochemistry
https://www.readbyqxmd.com/read/29333751/identification-of-the-minimal-glycotope-of-streptococcus-pneumoniae-7f-capsular-polysaccharide-using-synthetic-oligosaccharides
#3
Petra Menova, Mauro Sella, Katrin Sellrie, Claney Pereira, Peter H Seeberger
Streptococcus pneumoniae causes life-threatening diseases including meningitis, pneumonia and sepsis. Existing glycoconjugate vaccines based on purified capsular polysaccharides are widely used and help to prevent millions of deaths every year. Here, we report total synthesis of oligosaccharides resembling portions of the S. pneumoniae serotype 7F (ST7F) capsular polysaccharide repeating unit. To define minimal glycan epitopes, glycan microarrays containing the synthetic oligosaccharides were used to screen human reference serum and revealed that both side chains of the ST7F play a key role in antigen recognition...
January 14, 2018: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29333038/antihyperglycemic-potential-of-saponin-enriched-fraction-from-pithecellobium-dulce-benth-seed-extract
#4
Mahesh Kumar, Jeyabalan Govindrajan, Narendra Kumar Nyola
Background: Indian traditional system of medicine uses Pithecellobium dulce for the treatment of diabetes mellitus. Objectives: This study aims to develop an extract rich in saponins derived from seeds of the plant and to evaluate its antihyperglycemic potential in vitro and in vivo. Materials and Methods: Defatted seeds were extracted with methanol and processed to afford saponin-enriched fraction (Pithecellobium dulce saponin-enriched fraction [PDSEF])...
December 2017: Pharmacognosy Research
https://www.readbyqxmd.com/read/29332574/biomacromolecular-based-fibers-in-nanomedicine-a-combination-of-drug-delivery-and-tissue-engineering
#5
Elham Arkan, Abbas Hemati Azandaryani, Pouran Moradipour, Leila Behbood
BACKGROUND: Biopolymers based materials (polysaccharides, lipids, proteins, and nucleic acids) are one of the basic resources in bio-engineering sciences because of desirable features. Moreover, nanobiotechnology innovates nanomaterial and associated technique in nano medicine (drug delivery and tissue engineering). METHODS: In the nano-medicine, fibers are introduced as a successful biomimetic extracellular matrix scaffolds and drug carrier systems. Electrospinning as a simple and cost-effective technique is used to design nanofibers...
January 12, 2018: Current Pharmaceutical Biotechnology
https://www.readbyqxmd.com/read/29331909/linking-composition-of-extracellular-polymeric-substances-eps-to-the-physical-structure-and-hydraulic-resistance-of-membrane-biofilms
#6
Peter Desmond, James P Best, Eberhard Morgenroth, Nicolas Derlon
The effect of extracellular polymeric substances (EPS) on the meso-scale physical structure and hydraulic resistance of membrane biofilms during gravity driven membrane (GDM) filtration was investigated. Biofilms were developed on the surface of ultrafiltration membranes during dead-end filtration at ultra-low pressure (70 mbar). Biofilm EPS composition (total protein, polysaccharide and eDNA) was manipulated by growing biofilms under contrasting nutrient conditions. Nutrient conditions consisted of (i) a nutrient enriched condition with a nutrient ratio of 100:30:10 (C: N: P), (ii) a phosphorus limitation (C: N: P ratio: 100:30:0), and (iii) a nitrogen limitation (C: N: P ratio: 100:0:10)...
December 27, 2017: Water Research
https://www.readbyqxmd.com/read/29330852/characteristics-and-intestinal-immunomodulating-activities-of-water-soluble-pectic-polysaccharides-from-chenpi-with-different-storage-periods
#7
Changcheng Tian, Xu Hui, Jing Li, Zhuo Han
BACKGROUND: Traditional view considers that the long-term stored Chenpi (dried citrus peel) has better health efficacies as compared with the fresh Chenpi, but the detailed mechanism remains obscure. RESULTS: The three water-soluble pectic polysaccharides (CPP1, CPP5 and CPP10) were obtained from one-year, five-year and ten-year Chenpi, respectively, and their physicochemical characteristics and intestinal immunomodulating activities were investigated and compared...
January 13, 2018: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/29330591/changes-in-the-lipopolysaccharide-of-proteus-mirabilis-9b-m-o11a-clinical-strain-in-response-to-planktonic-or-biofilm-type-of-growth
#8
Agnieszka Zabłotni, Dominik Matusiak, Nikolay P Arbatsky, Magdalena Moryl, Anna Maciejewska, Anna N Kondakova, Alexander S Shashkov, Czesław Ługowski, Yuriy A Knirel, Antoni Różalski
The impact of planktonic and biofilm lifestyles of the clinical isolate Proteus mirabilis 9B-m on its lipopolysaccharide (O-polysaccharide, core region, and lipid A) was evaluated. Proteus mirabilis bacteria are able to form biofilm and lipopolysaccharide is one of the factors involved in the biofilm formation. Lipopolysaccharide was isolated from planktonic and biofilm cells of the investigated strain and analyzed by SDS-PAGE with silver staining, Western blotting and ELISA, as well as NMR and matrix-assisted laser desorption ionization time-of-flight mass spectrometry techniques...
January 12, 2018: Medical Microbiology and Immunology
https://www.readbyqxmd.com/read/29330244/primary-care-physicians-struggle-with-current-adult-pneumococcal-vaccine-recommendations
#9
Laura P Hurley, Mandy A Allison, Tamara Pilishvili, Sean T O'Leary, Lori A Crane, Michaela Brtnikova, Brenda L Beaty, Megan C Lindley, Carolyn B Bridges, Allison Kempe
INTRODUCTION: In 2012, the Advisory Committee on Immunization Practices recommended 13-valent pneumococcal conjugate vaccine (PCV13) in series with 23-valent pneumococcal polysaccharide vaccine (PPSV23) for at-risk adults ≥19; in 2014, it expanded this recommendation to adults ≥65. Primary care physicians' practice, knowledge, attitudes, and beliefs regarding these recommendations are unknown. METHODS: Primary care physicians throughout the U.S. were surveyed by E-mail and post from December 2015 to January 2016...
January 2018: Journal of the American Board of Family Medicine: JABFM
https://www.readbyqxmd.com/read/29329813/effects-of-metal-ions-in-tea-polysaccharides-on-their-in-vitro-antioxidant-activity-and-hypoglycemic-activity
#10
Minghao Fan, Xun Sun, Yilin Qian, Ying Xu, Dongfeng Wang, Yanping Cao
Total tea polysaccharides (TTPS) were extracted from two kinds of pruning leaves of tea plant and fractionated into neutral tea polysaccharides (TPSI) and acidic tea polysaccharides (TPSII) by anion exchange resin D315. Some physicochemical properties, including structure, monosaccharide composition, and molecular weight distribution, as well as the 4 in vitro antioxidant activities and inhibitory effects on α-glucosidase of above polysaccharides before and after removing metal ions were investigated. By comparing TTPS and TPSII, we found that they exhibited different antioxidant activities and inhibitory actions against α-glucosidase after their metal ions were removed...
January 9, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29329812/synergistic-effect-of-polysaccharides-betalain-pigment-and-phenolic-compounds-of-red-prickly-pear-opuntia-stricta-in-the-stabilization-of-salami
#11
Nadia Kharrat, Hedia Salem, Aicha Mrabet, Fatma Aloui, Soumaya Triki, Ahmed Fendri, Youssef Gargouri
The aim of this work is to try to substitute some synthetic additives by a natural extract from red prickly pear (Opuntia stricta) which known by its richness on bioactive polysaccharides mainly consisting of galactose, rhamnose and galacturonic acid. This natural fruit has a high content of carbohydrates above 18.81% FM. It contains also a high level of polyphenols 152.25 ± 0.26 μg QE/mg PPE and flavonoids about 370.60 ± 0.12 μg GAE/mg of PPE. In addition, prickly pear extract (PPE) displayed a strong antioxidant and antimicrobial activities...
January 9, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29329811/cardioprotection-activity-and-mechanism-of-astragalus-polysaccharide-in-vivo-and-in-vitro
#12
Debin Liu, Lei Chen, Jianye Zhao, Kang Cui
Astragalus polysaccharides (ASP) is extracted from Astragalus, and is the main active ingredient of Astragalus membranaceus. The purpose of this study was to investigate the protective effect of ASP on rat cardiomyocytes damage induced by myocardial ischemia and reperfusion injury (MVRI) and isoprenaline(ISO) in vivo and in vitro. The model of cardiomyocytes damage was induced using MVRI in a rat in vivo and also using ISO in cell. After ASP intervention, the protective effect of ASP on cardiomyocytes was evaluated by animal experimental and cell experimental...
January 9, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29329645/polysaccharides-extracted-from-the-roots-of-bupleurum-chinense-dc-modulates-macrophage-functions
#13
Zhi-De Zhang, Hong Li, Fen Wan, Xiao-Yu Su, Yan Lu, Dao-Feng Chen, Yun-Yi Zhang
The present study aimed to investigate the effects of polysaccharides extracted from Bupleurum chinense DC (BCPs) on macrophage functions. In the in vivo experiment, 1 mL of 5% sodium thioglycollate was injected into the abdomen of the mice on Day 0 and macrophages were harvested on Day 4. The macrophages were cultured in plates and treated with different concentrations of BCPs and stimulus. Effects of BCPs on macrophage functions were assessed by chemotaxis assay, phagocytosis assay and Enzyme-Linked Immunosorbent Assay (ELISA)...
December 2017: Chinese Journal of Natural Medicines
https://www.readbyqxmd.com/read/29329607/the-genus-liriope-phytochemistry-and-pharmacology
#14
Zhan-Peng Shang, Fei Wang, Jia-Yu Zhang, Zi-Jian Wang, Jian-Qiu Lu, Huai-You Wang, Ning Li
Liriope (Liliaceae) species have been used as folk medicines in Asian countries since ancient times. From Liriope plants (8 species), a total of 132 compounds (except polysaccharides) have been isolated and identified, including steroidal saponins, flavonoids, phenols, and eudesmane sesquiterpenoids. The crude extracts or monomeric compounds from this genus have been shown to exhibit anti-tumor, anti-diabetic, anti-inflammatory, and neuroprotective activities. The present review summarizes the results on phytochemical and biological studies on Liriope plants...
November 2017: Chinese Journal of Natural Medicines
https://www.readbyqxmd.com/read/29329339/accessibility-and-contribution-to-glucan-masking-of-natural-and-genetically-tagged-versions-of-yeast-wall-protein-1-of-candida-albicans
#15
Bruce L Granger
Yeast wall protein 1 (Ywp1) is an abundant glycoprotein of the cell wall of the yeast form of Candida albicans, the most prevalent fungal pathogen of humans. Antibodies that bind to the polypeptide backbone of isolated Ywp1 show little binding to intact yeast cells, presumably because the Ywp1 epitopes are masked by the polysaccharides of the mannoproteins that form the outer layer of the cell wall. Rare cells do exhibit much greater anti-Ywp1 binding, however, and one of these was isolated and characterized...
2018: PloS One
https://www.readbyqxmd.com/read/29329275/chitosan-starch-films-with-natural-extracts-physical-chemical-morphological-and-thermal-properties
#16
Jessica I Lozano-Navarro, Nancy P Díaz-Zavala, Carlos Velasco-Santos, José A Melo-Banda, Ulises Páramo-García, Francisco Paraguay-Delgado, Ricardo García-Alamilla, Ana L Martínez-Hernández, Samuel Zapién-Castillo
The aim of this study is to analyze the properties of a series of polysaccharide composite films, such as apparent density, color, the presence of functional groups, morphology, and thermal stability, as well as the correlation between them and their antimicrobial and optical properties. Natural antioxidants such as anthocyanins (from cranberry; blueberry and pomegranate); betalains (from beetroot and pitaya); resveratrol (from grape); and thymol and carvacrol (from oregano) were added to the films. Few changes in the position and intensity of the FTIR spectra bands were observed despite the low content of extract added to the films...
January 12, 2018: Materials
https://www.readbyqxmd.com/read/29328882/effects-of-salvia-miltiorrhiza-polysaccharides-on-lipopolysaccharide-induced-inflammatory-factor-release-in-raw264-7-cells
#17
Chao Han, Jinkai Yang, Pengyan Song, Xiao Wang, Wanyu Shi
This study investigated the anti-inflammatory effects and possible underlying mechanisms of Salvia miltiorrhiza polysaccharides (SMP) in lipopolysaccharide (LPS)-stimulated RAW264.7 cells. The cytotoxicity of SMP was detected by the MTT method. The morphological change of RAW264.7 was observed by Diff-Quik staining. Enzyme-linked immunosorbent assay was used to evaluate the production of cytokines in LPS-induced RAW264.7 cells. The nitric oxide (NO) kit assay detected the NO release from LPS-induced RAW264...
January 2018: Journal of Interferon & Cytokine Research
https://www.readbyqxmd.com/read/29328495/fucoidan-downregulates-insulin-like-growth-factor-i-receptor-levels-in-ht-29-human-colon-cancer-cells
#18
In-Hye Kim, Taek-Jeong Nam
Fucoidan, a sulfated polysaccharide present in brown seaweed, has demonstrated anticancer activity in lung, breast, liver and colon cells. The insulin-like growth factor (IGF) signaling pathway regulates growth in HT-29 cells through the insulin receptor substrate-1 (IRS-1)/phosphatidylinositol 3-kinase (PI3K)/protein kinase B (AKT) and Ras/Raf/extracellular signal-regulated kinase (ERK) pathways. The aim of the present study was to investigate whether fucoidan downregulates the IGF-IR signaling pathway in HT-29 human colon cancer cells...
January 4, 2018: Oncology Reports
https://www.readbyqxmd.com/read/29327068/the-specific-effect-of-gallic-acid-on-escherichia-coli-biofilm-formation-by-regulating-pgaabcd-genes-expression
#19
Jiamu Kang, Qianqian Li, Liu Liu, Wenyuan Jin, Jingfan Wang, Yuyang Sun
Escherichia coli (E. coli) is associated with an array of health-threatening contaminations, some of which are related to biofilm states. The pgaABCD-encoded poly-beta-1,6-N-acetyl-D-glucosamine (PGA) polymer plays an important role in biofilm formation. This study was conducted to determine the inhibitory effect of gallic acid (GA) against E. coli biofilm formation. Minimal inhibitory concentration (MIC) and minimal bactericidal concentration (MBC) values of GA against planktonic E. coli were 0.5 and 4 mg/mL, and minimal biofilm inhibitory concentration and minimal biofilm eradication concentration values of GA against E...
January 11, 2018: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/29325744/dextran-hydrogels-by-crosslinking-with-amino-acid-diamines-and-their-viscoelastic-properties
#20
Naphtali A O'Connor, Mihaela Jitianu, Greisly Nunez, Quentin Picard, Madeline Wong, David Akpatsu, Adam Negrin, Rajendra Gharbaran, Daniel Lugo, Sundus Shaker, Andrei Jitanu, Stephen Redenti
Amine functionalized polysaccharide hydrogels such as those based on chitosan are widely examined as biomaterials. Here we set out to develop a facile procedure for developing such hydrogels by crosslinking dextran with amino acid diamines. The dextran-amino acid gels were formed by the addition of the amino acid diamines to a dextran and epichlorohydrin solution once it became homogeneous. This was demonstrated with three amino acid diamines, lysine, lysine methyl ester, and cystine dimethyl ester. Hydrogel networks with albumin entrapped were also demonstrated...
January 8, 2018: International Journal of Biological Macromolecules
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