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Glucomannan

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https://www.readbyqxmd.com/read/28535423/chromatographic-separation-and-detection-methods-of-aloe-arborescens-miller-constituents-a-systematic-review
#1
REVIEW
Jilan A Nazeam, Haidy A Gad, Hala M El-Hefnawy, Abdel-Naser B Singab
Aloe arborescens Miller (Family Asphodelaceae) is a member of genus Aloe, which is used in traditional medicine to cure various diseases. The extracts of the plant have been reported to possess anticancer, immunomodulator, antidiabetic, anti-inflammatory and antioxidant activities. The phytochemical investigations have revealed diverse chemical constituents, including phenolics [anthraquinones, anthrones, pyrones, chromones and coumarins], polysaccharides [arborans [(1-4) linked glucomannans, polysaccharide (A, B and C): (A: a linear (1-6)-O-α-glucan, B: a branching (1-2)-O-l-arabinose with (1-2)-O-d-galactose linkages and C: (1-4)-O-β-mannan with 18% acetyl group)]], glycoproteins and carboxypeptidase enzyme...
April 29, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28504162/purification-of-glucomannan-from-salep-part-2-structural-characterization
#2
Abdullah Kurt, Talip Kahyaoglu
The aim of this study was to investigate the effects of different extraction temperatures (25, 55 and 85°C) on the structural characteristics of glucomannan (GM) purified from salep. All extraction conditions reduced protein content and molecular weight of salep. The effectiveness of removing the impurities and the highest purity of GM25 were observed with size exclusion profile. FTIR experiments demonstrated the presence of acetyl group, reduction of protein content and increment of polymer interaction of GM25...
August 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28489527/role-of-glucomannans-in-immunology
#3
Richard Tester, Farage H Al-Ghazzewi
Glucomannans play a much broader role in human health then providing dietary fibre. They are biologically active molecules and can when added to the body imitate innate molecules found in different organs including surface carbohydrates on cells. This review considers the immunological role of exogenous glucomannans within animals and man. This article is open to POST-PUBLICATION REVIEW. Registered readers (see "For Readers") may comment by clicking on ABSTRACT on the issue's contents page.
2017: Journal of Pharmacy & Pharmaceutical Sciences: a Publication of the Canadian Society for Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28472600/glucomannan-or-glucomannan-plus-spirulina-enriched-squid-surimi-diets-reduce-histological-damage-to-liver-and-heart-in-zucker-fa-fa-rats-fed-a-cholesterol-enriched-and-non-cholesterol-enriched-atherogenic-diet
#4
Miguel Vázquez-Velasco, Laura González-Torres, Rosa A García-Fernández, María Teresa Méndez, Sara Bastida, Juana Benedí, María José González-Muñoz, Francisco J Sánchez-Muniz
Glucomannan-enriched squid surimi improves cholesterolemia and liver antioxidant status. The effect of squid surimi enriched with glucomannan or glucomannan plus spirulina on liver and heart structures and cell damage markers was tested in fa/fa rats fed highly saturated-hyper-energetic diets. Animals were fed 70% AIN-93M rodent diet plus six versions of 30% squid surimi for 7 weeks: control (C), glucomannan (G), and glucomannan plus spirulina (GS). The cholesterol-control (HC), cholesterol-glucomannan (HG), and cholesterol-glucomannan plus spirulina (HGS) groups were given similar diets that were enriched with 2% cholesterol and 0...
May 4, 2017: Journal of Medicinal Food
https://www.readbyqxmd.com/read/28462052/cloning-and-evaluation-of-reference-genes-for-quantitative-real-time-pcr-analysis-in-amorphophallus
#5
Kai Wang, Yi Niu, Qijun Wang, Haili Liu, Yi Jin, Shenglin Zhang
Quantitative real-time reverse transcription PCR (RT-qPCR) has been widely used in the detection and quantification of gene expression levels because of its high accuracy, sensitivity, and reproducibility as well as its large dynamic range. However, the reliability and accuracy of RT-qPCR depends on accurate transcript normalization using stably expressed reference genes. Amorphophallus is a perennial plant with a high content of konjac glucomannan (KGM) in its corm. This crop has been used as a food source and as a traditional medicine for thousands of years...
2017: PeerJ
https://www.readbyqxmd.com/read/28460917/healthy-spanish-salchich%C3%A3-n-enriched-with-encapsulated-n-3-long-chain-fatty-acids-in-konjac-glucomannan-matrix
#6
Jose M Lorenzo, Paulo Eduardo Sichetti Munekata, Mirian Pateiro, Paulo Cezar Bastianello Campagnol, Ruben Domínguez
Reduction of fat content and improving fatty acid composition were the strategies used to reformulate Spanish salchichón with better lipid content by partial substitution of pork backfat by microencapsulated fish oil in konjac glucomannan matrix. For the present study, four different batches were manufactured: control (CO) with 100% of pork backfat and ME25, ME50 and ME75 where the pork backfat was replaced with 25, 50 and 75% by microencapsulated fish oil, respectively. The fat replacement by microencapsulated fish oil was accompanied by a decrease (P<0...
November 2016: Food Research International
https://www.readbyqxmd.com/read/28460335/a-macrophage-activating-injectable-hydrogel-to-sequester-endogenous-growth-factors-for-in-situ-angiogenesis
#7
Yanxian Feng, Qiu Li, Dang Wu, Yiming Niu, Cheng Yang, Lei Dong, Chunming Wang
Biomaterials scaffolds designed for many regenerative applications are expected to support neo-vascularisation, which is now being hampered by two limitations - the instability of exogenous growth factors (GFs) that are delivered to promote angiogenesis; and the loss of extracellular matrix components that bind and stabilise GFs. Here, we report the design and evaluation of an injectable hydrogel system aimed at restoring a GF-binding microenvironment to enhance the pro-angiogenic functions of endogenous GFs...
April 25, 2017: Biomaterials
https://www.readbyqxmd.com/read/28457433/purification-of-glucomannan-from-salep-part-1-detailed-rheological-characteristics
#8
Abdullah Kurt, Talip Kahyaoglu
The aim of this study was to investigate the effects of different extraction temperatures (25, 55 and 85°C) on the rheological characteristics of glucomannan (GM) purified from salep. GM was isolated using the following method: extraction of GM with water, removal of impurities by centrifugation and precipitation of GM with ethanol. The extraction yield of GM was approximately 45% for all products. Higher GM (95%) and lower starch (3%) contents were obtained for GM25. GM25 showed higher apparent and intrinsic viscosity, storage and loss modulus and lower activation energy than GM55 and GM85...
July 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28450022/physicochemical-properties-and-cellular-protection-against-oxidation-of-degraded-konjac-glucomannan-prepared-by-%C3%AE-irradiation
#9
Wenjie Jian, Liying Tu, Lanlan Wu, Hejian Xiong, Jie Pang, Yuan-Ming Sun
Konjac glucomannan (KGM) is an important functional polysaccharide in food research. However, unstable dispersibility of KGM inhibits its in-depth study and wide application. In this study, a degraded KGM (100kGy-KGM), which showed excellent dispersibility and specific physicochemical properties, were obtained by γ-irradiation in a dosage of 100kGy. We investigated the protective effect of 100kGy-KGM against H2O2 induced oxidative damage in LO2 cells. Our results demonstrated that pretreatment of LO2 cells with 100kGy-KGM not only significantly increased cellular survivals and activities of GSH-Px and CAT, but also reduced levels of LDH, MDA and intracellular accumulation of ROS...
September 15, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28429913/effect-of-glucomannan-on-functional-constipation-in-children-a-systematic-review-and-meta-analysis-of-randomised-controlled-trials
#10
Yong Han, Lei Zhang, Xiang-Qun Liu, Zhi-Jun Zhao, Lu-Xian Lv
BACKGROUND AND OBJECTIVES: Constipation, a common complaint in children, considerably affects the quality of life. This systematic review assessed the treatment effects of glucomannan on children with constipation by summarising evidence from previous randomised controlled trials (RCTs). METHODS AND STUDY DESIGN: A comprehensive electronic literature search was conducted for identifying eligible RCTs that evaluated the effectiveness of glucomannan. The results were reported as mean differences (MDs), standardised mean differences (SMDs), and risk ratios (RRs) with 95% confidence intervals (CIs)...
May 2017: Asia Pacific Journal of Clinical Nutrition
https://www.readbyqxmd.com/read/28408313/preventing-cardiovascular-heart-disease-promising-nutraceutical-and-non-nutraceutical-treatments-for-cholesterol-management
#11
REVIEW
T P Johnston, T A Korolenko, M Pirro, A Sahebkar
Hypercholesterolemia is one of the major risk factors for the development of cardiovascular disease. Atherosclerosis resulting from hypercholesterolemia causes many serious cardiovascular diseases. Statins are generally accepted as a treatment of choice for lowering low-density lipoprotein (LDL) cholesterol, which reduces coronary heart disease morbidity and mortality. Since statin use can be associated with muscle problems and other adverse symptoms, non-adherence and discontinuation of statin therapy often leads to inadequate control of plasma cholesterol levels and increased cardiovascular risk...
June 2017: Pharmacological Research: the Official Journal of the Italian Pharmacological Society
https://www.readbyqxmd.com/read/28372193/effects-of-konjac-glucomannan-on-heat-induced-changes-of-wheat-gluten-structure
#12
Yu Wang, Yiheng Chen, Yun Zhou, Satoru Nirasawa, Eizo Tatsumi, Xiuting Li, Yongqiang Cheng
Effects of konjac glucomannan on the structure of wheat gluten were investigated at variable temperatures in this study. Dynamic oscillatory rheology study showed that konjac glucomannan conferred stiffness on gluten with a higher tan δ data at 25°C and 55°C, but this parameter was lower at 75°C and 95°C. Konjac glucomannan decreased the content of thiol equivalent groups and increased the α-helix/β-sheet content ratio, respectively. The thicker layer of gluten protein with 5% konjac glucomannan was observed by scanning electron microscopy...
August 15, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28363561/a-kinetic-model-of-the-gelation-of-konjac-glucomannan-induced-by-deacetylation
#13
Ching-Feng Mao, Cheng-Ho Chen
The gelation of konjac glucomannan (KGM) often involves an induction period featured by an initial drop in modulus. The gelation kinetics recorded as a time-dependent modulus change is composed of an initial drop followed by a steady increase in modulus until an equilibrium stage is reached. In this work, the time-dependent modulus curve is described by a kinetic model which incorporates the cascade theory with the kinetic equations consisting of sequential reactions of deacetylation and cross-link formation...
June 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28356275/a-systematic-review-and-meta-analysis-of-randomized-controlled-trials-of-the-effect-of-konjac-glucomannan-a-viscous-soluble-fiber-on-ldl-cholesterol-and-the-new-lipid-targets-non-hdl-cholesterol-and-apolipoprotein-b
#14
Hoang Vi Thanh Ho, Elena Jovanovski, Andreea Zurbau, Sonia Blanco Mejia, John L Sievenpiper, Fei Au-Yeung, Alexandra L Jenkins, Lea Duvnjak, Lawrence Leiter, Vladimir Vuksan
Background: Evidence from randomized controlled trials (RCTs) suggests the consumption of konjac glucomannan (KJM), a viscous soluble fiber, for improving LDL-cholesterol concentrations. It has also been suggested that the cholesterol-lowering potential of KJM may be greater than that of other fibers. However, trials have been relatively scarce and limited in sample size and duration, and the effect estimates have been inconsistent. The effect of KJM on new lipid targets of cardiovascular disease (CVD) risk is also unknown...
March 29, 2017: American Journal of Clinical Nutrition
https://www.readbyqxmd.com/read/28325998/glucomannan-and-glucomannan-plus-spirulina-enriched-pork-affect-liver-fatty-acid-profile-ldl-receptor-expression-and-antioxidant-status-in-zucker-fa-fa-rats-fed-atherogenic-diets
#15
Laura González-Torres, Cátia Matos, Miguel Vázquez-Velasco, Jorge A Santos-López, Iria Sánchez-Martínez, Camino García-Fernández, Sara Bastida, Juana Benedí, Francisco J Sánchez-Muniz
We evaluated the effects of glucomannan or glucomannan plus spirulina-restructured pork (RP) on liver fatty acid profile, desaturase/elongase enzyme activities and oxidative status of Zucker fa/fa rats for seven weeks. Control (C), glucomannan (G) and glucomannan/spirulina (GS)-RP; HC (cholesterol-enriched control), HG and HGS (cholesterol-enriched glucomannan and glucomannan/spirulina-RP) experimental diets were tested. Increased metabolic syndrome markers were found in C, G and GS rats. Cholesterol feeding increased liver size, fat, and cholesterol and reduced antioxidant enzyme levels and expressions...
2017: Food & Nutrition Research
https://www.readbyqxmd.com/read/28317006/proteomic-data-on-enzyme-secretion-and-activity-in-the-bacterium-chitinophaga-pinensis
#16
Johan Larsbrink, Tina R Tuveng, Phillip B Pope, Vincent Bulone, Vincent G H Eijsink, Harry Brumer, Lauren S McKee
The secretion of carbohydrate-degrading enzymes by a bacterium sourced from a softwood forest environment has been investigated by mass spectrometry. The findings are discussed in full in the research article "Proteomic insights into mannan degradation and protein secretion by the forest floor bacterium Chitinophaga pinensis" in Journal of Proteomics by Larsbrink et al. ([1], doi: 10.1016/j.jprot.2017.01.003). The bacterium was grown on three carbon sources (glucose, glucomannan, and galactomannan) which are likely to be nutrient sources or carbohydrate degradation products found in its natural habitat...
April 2017: Data in Brief
https://www.readbyqxmd.com/read/28293293/the-podospora-anserina-lytic-polysaccharide-monooxygenase-palpmo9h-catalyzes-oxidative-cleavage-of-diverse-plant-cell-wall-matrix-glycans
#17
Mathieu Fanuel, Sona Garajova, David Ropartz, Nicholas McGregor, Harry Brumer, Hélène Rogniaux, Jean-Guy Berrin
BACKGROUND: The enzymatic conversion of plant biomass has been recently revolutionized by the discovery of lytic polysaccharide monooxygenases (LPMO) that catalyze oxidative cleavage of polysaccharides. These powerful enzymes are secreted by a large number of fungal saprotrophs and are important components of commercial enzyme cocktails used for industrial biomass conversion. Among the 33 AA9 LPMOs encoded by the genome of Podospora anserina, the PaLPMO9H enzyme catalyzes mixed C1/C4 oxidative cleavage of cellulose and cello-oligosaccharides...
2017: Biotechnology for Biofuels
https://www.readbyqxmd.com/read/28265262/genomic-analysis-of-caldithrix-abyssi-the-thermophilic-anaerobic-bacterium-of-the-novel-bacterial-phylum-calditrichaeota
#18
Ilya V Kublanov, Olga M Sigalova, Sergey N Gavrilov, Alexander V Lebedinsky, Christian Rinke, Olga Kovaleva, Nikolai A Chernyh, Natalia Ivanova, Chris Daum, T B K Reddy, Hans-Peter Klenk, Stefan Spring, Markus Göker, Oleg N Reva, Margarita L Miroshnichenko, Nikos C Kyrpides, Tanja Woyke, Mikhail S Gelfand, Elizaveta A Bonch-Osmolovskaya
The genome of Caldithrix abyssi, the first cultivated representative of a phylum-level bacterial lineage, was sequenced within the framework of Genomic Encyclopedia of Bacteria and Archaea (GEBA) project. The genomic analysis revealed mechanisms allowing this anaerobic bacterium to ferment peptides or to implement nitrate reduction with acetate or molecular hydrogen as electron donors. The genome encoded five different [NiFe]- and [FeFe]-hydrogenases, one of which, group 1 [NiFe]-hydrogenase, is presumably involved in lithoheterotrophic growth, three other produce H2 during fermentation, and one is apparently bidirectional...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28248105/manufacture-and-properties-of-glucomannans-and-glucomannooligosaccharides-derived-from-konjac-and-other-sources
#19
REVIEW
Belén Gómez, Beatriz Míguez, Remedios Yáñez, José L Alonso
Glucomannans (GM) are polymers that can be found in natural resources, such as tubers, bulbs, roots, and both hard- and softwoods. In fact, mannan-based polysaccharides represent the largest hemicellulose fraction in softwoods. In addition to their structural functions and their role as energy reserve, they have been assessed for their healthy applications, including their role as new source of prebiotics. This paper summarizes the scientific literature regarding the manufacture and functional properties of GM and their hydrolysis products with a special focus on their prebiotic activity...
March 15, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28224918/remodeling-of-pectin-and-hemicelluloses-in-tomato-pericarp-during-fruit-growth
#20
Fabienne Guillon, Adeline Moïse, Bernard Quemener, Brigitte Bouchet, Marie-Françoise Devaux, Camille Alvarado, Marc Lahaye
Tomato fruit texture depends on histology and cell wall architecture, both under genetic and developmental controls. If ripening related cell wall modifications have been well documented with regard to softening, little is known about cell wall construction during early fruit development. Identification of key events and their kinetics with regard to tissue architecture and cell wall development can provide new insights on early phases of texture elaboration. In this study, changes in pectin and hemicellulose chemical characteristics and location were investigated in the pericarp tissue of tomato (Solanum lycopersicon var Levovil) at four stages of development (7, 14 and 21day after anthesis (DPA) and mature green stages)...
April 2017: Plant Science: An International Journal of Experimental Plant Biology
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