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Glucomannan

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https://www.readbyqxmd.com/read/28917879/laccase-tempo-oxidation-in-the-production-of-mechanically-strong-arabinoxylan-and-glucomannan-aerogels
#1
Kirsti Parikka, Ida Nikkilä, Leena Pitkänen, Abdul Ghafar, Tuula Sontag-Strohm, Maija Tenkanen
New wheat arabinoxylan and konjac glucomannan hydrogels and aerogels were prepared by hemiacetal crosslinking induced by laccase/TEMPO (2,2,6,6-tetramethylpiperidine-1-oxyl) -catalysed oxidation, which selectively converts the primary hydroxyl groups to aldehydes. The degree of oxidation of the product aldehydes was ca. 10% of the total carbohydrates of the polysaccharides, and the determination of storage and viscous moduli of the oxidised samples showed that they had formed true hydrogels. Two freezing methods for the hydrogels, conventional freezing and ice crystal templating, were investigated for aerogel production, the ice crystal templated products especially were mechanically strong in compression test against the ice crystals' growth direction...
November 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28821095/an-o-acetyl-glucomannan-from-the-rhizomes-of-curculigo-orchioides-structural-characterization-and-anti-osteoporosis-activity-in-vitro
#2
Xueqian Wang, Mengliu Zhang, Dawei Zhang, Shumei Wang, Chunyan Yan
Osteoporosis is characterized by a reduction in bone mass and bone mineral density, which weakens the bone. Due to the side effects associated with drugs that are currently used to treat this disease, an increasing number of studies have focused on the research of effective ingredients derived from natural products. In particular, polysaccharides extracted from Chinese herbal medicines have received increasing attention. In this study, we isolated a homogeneous polysaccharide (COP90-1) from the dried rhizomes of Curculigo orchioides, a famous traditional Chinese medicine that is widely used in China, and determined its structure using the combined methods of chemical and spectral analyses...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28821076/confirmation-and-measurement-of-hydrophobic-interaction-in-sol-gel-system-of-konjac-glucomannan-with-different-degree-of-deacetylation
#3
Chen Xin, Jian Chen, Hongshan Liang, Jiawei Wan, Jing Li, Bin Li
Fluorescence measurement was used as a tool to study the hydrophobic interaction in sol-gel system of konjac glucomannan (KGM) with different degree of deacetylation (DD). In the concentration from 0 to 10g/L, I1/I3 ratio of native KGM declined from 1.75 to 1.25. Before and after heating, the critical associating concentration of the native KGM was 0.60g/L and 0.95g/L respectively, but this value of deacetylated KGM (DD=32.58%) was 0.58g/L and 0.45g/L respectively. The addition of Na2SO4 and NaSCN exhibited more significant influence on deacetylated KGM compared with native KGM...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28821062/cell-wall-polysaccharides-from-pulp-and-peel-of-cubiu-a-pectin-rich-fruit
#4
Cristiane Colodel, Rosane Maria das Graças Bagatin, Talita Maria Tavares, Carmen Lúcia de Oliveira Petkowicz
To investigate the polysaccharides of cubiu (Solanum sessiliflorum D.) fruits, pulp and peel were subjected to sequential extractions using different solvents, giving rise to pectins heterogeneous with respect to their structural characteristics, xylan, arabinogalactoxyloglucans and glucomannans. Chemical, physicochemical and spectroscopic analyses were used to characterize the polysaccharides obtained. Pectins with uronic acid content of commercial grade were obtained from the peel of cubiu fruits using water (25°C and 100°C) and EDTA and from its pulp using water (100°C)...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28772883/high-strength-konjac-glucomannan-silver-nanowires-composite-films-with-antibacterial-properties
#5
Jia Lei, Lei Zhou, Yongjian Tang, Yong Luo, Tao Duan, Wenkun Zhu
Robust, high-strength and environmentally friendly antibacterial composite films were prepared by simply blending konjac glucomannan (KGM) and silver nanowires (Ag NWs) in an aqueous system. The samples were then characterized using scanning electron microscopy (SEM), X-ray diffraction (XRD), thermal gravimetric analysis, mechanical property tests, Fourier transform infrared spectra (FT-IR), X-ray photoelectron spectroscopy (XPS) and antimicrobial tests. The results showed that there was a high ratio of Ag NWs uniformly distributed in the composite films, which was vital for mechanical reinforcement and stable antibacterial properties...
May 12, 2017: Materials
https://www.readbyqxmd.com/read/28739406/structural-characterization-and-properties-of-konjac-glucomannan-and-zein-blend-films
#6
Kai Wang, Kao Wu, Man Xiao, Ying Kuang, Harold Corke, Xuewen Ni, Fatang Jiang
A series of konjac glucomannan (KGM)/zein blend films were successfully prepared with zein in proportions 0-30%. The hydrophobicity of blend films were significantly stronger than pure KGM film, indicated by increased contact angle, swelling and solubility properties, and moisture absorption. Moreover, other properties including mechanical, thermal, water vapor and oxygen barrier were also found to be increased. FTIR indicated that hydrogen bond interactions and Maillard reaction occurred between KGM and zein molecules, and microstructural observations indicated that the aggregated zein was homogeneously dispersed in the KGM continuous matrix...
July 21, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28739053/glucomannan-consumption-elevates-colonic-alkaline-phosphatase-activity-by-up-regulating-the-expression-of-iap-i-which-is-associated-with-increased-production-of-protective-factors-for-gut-epithelial-homeostasis-in-high-fat-diet-fed-rats
#7
Yukako Okazaki, Tetsuyuki Katayama
We previously reported that consumption of glucomannan-containing food (lily bulb) modulates gut microbiota and increases gut immunoglobulin A (IgA, index of intestinal immune function), mucins (index of intestinal barrier function), and colonic alkaline phosphatase (ALP) activity in rats fed a high-fat (HF) diet. Small intestinal ALP has an established protective effect in inflammatory diseases, whereas little is known about the function of colonic ALP activity. We hypothesized that dietary glucomannan would increase colonic ALP activity and the gene expression in rats fed an HF diet...
July 2017: Nutrition Research
https://www.readbyqxmd.com/read/28714872/immunomodulatory-activity-of-octenyl-succinic-anhydride-modified-porang-amorphophallus-oncophyllus-glucomannan-on-mouse-macrophage-like-j774-1-cells-and-mouse-primary-peritoneal-macrophages
#8
Sellen Gurusmatika, Kosuke Nishi, Eni Harmayani, Yudi Pranoto, Takuya Sugahara
Porang is a local plant of Indonesia, which has a high content of glucomannan. In this study, porang glucomannan (PG) was esterified with octenyl succinic anhydride (OSA) to enhance emulsion properties to be widely used in food industry. OSA-modified PG (OSA-PG) enhanced the phagocytosis activity of macrophage-like J774.1 cells and mouse peritoneal macrophages. In addition, OSA-PG increased the production of IL-6 and TNF-α by enhancing their gene expression. Immunoblot analysis displayed that OSA-PG tended to activate both nuclear factor-κB and mitogen-activated protein kinase cascades...
July 15, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28712327/genetic-diversity-and-phylogenetic-relationships-of-seven-amorphophallus-species-in-southwestern-china-revealed-by-chloroplast-dna-sequences
#9
Yong Gao, Si Yin, Huixiao Yang, Lifang Wu, Yuehui Yan
Plants species in the genus Amorphophallus are of great economic importance, as they are the only plants known to produce glucomannan. Although southwestern China has been recognized as one of the origin centres of Amorphophallus, only a few studies assessing its genetic diversity have been reported. To aid in the utilization and conservation of Amorphophallus species, we evaluated the genetic diversity and phylogenetic relationships among seven edible Amorphophallus species using three chloroplast DNA regions (rbcL, trnL and trnK-matK)...
July 15, 2017: Mitochondrial DNA. Part A. DNA Mapping, Sequencing, and Analysis
https://www.readbyqxmd.com/read/28704184/enzymatic-hydrolysis-of-water-extractable-polysaccharides-from-leaves-of-plantago-major-l
#10
Paolina K Lukova, Diana P Karcheva-Bahchevanska, Veselin P Bivolarski, Rumen D Mladenov, Ilia N Iliev, Mariana M Nikolova
BACKGROUND: Plantago major L. leaves have been used for centuries by the traditional medicine in the treatment of infectious disorders of the respiratory, urinary and digestive tracts. Researchers have reported that hot water extracts of Plantago major possess a broad-spectrum of anticancer, antioxidant and antiviral activities, as well as activities which modulate cell-mediated immunity. Their beneficial properties may be due to the significant content of polysaccharides. The polysaccharides that have been isolated from the leaves of Plantago major L...
June 1, 2017: Folia Medica
https://www.readbyqxmd.com/read/28699115/non-cellulosic-polysaccharide-distribution-during-g-layer-formation-in-poplar-tension-wood-fibers-abundance-of-rhamnogalacturonan-i-and-arabinogalactan-proteins-but-no-evidence-of-xyloglucan
#11
Fernanda Trilstz Perassolo Guedes, Françoise Laurans, Bernard Quemener, Carole Assor, Véronique Lainé-Prade, Nathalie Boizot, Jacqueline Vigouroux, Marie-Claude Lesage-Descauses, Jean-Charles Leplé, Annabelle Déjardin, Gilles Pilate
RG-I and AGP, but not XG, are associated to the building of the peculiar mechanical properties of tension wood. Hardwood trees produce tension wood (TW) with specific mechanical properties to cope with environmental cues. Poplar TW fibers have an additional cell wall layer, the G-layer responsible for TW mechanical properties. We investigated, in two poplar hybrid species, the molecules potentially involved in the building of TW mechanical properties. First, we evaluated the distribution of the different classes of non-cellulosic polysaccharides during xylem fiber differentiation, using immunolocalization...
July 11, 2017: Planta
https://www.readbyqxmd.com/read/28687934/co-administration-of-a-konjac-based-fibre-blend-and-american-ginseng-panax-quinquefolius-l-on-glycaemic-control-and-serum-lipids-in-type-2-diabetes-a-randomized-controlled-cross-over-clinical-trial
#12
Alexandra L Jenkins, Linda M Morgan, Jacqueline Bishop, Elena Jovanovski, David J A Jenkins, Vladimir Vuksan
PURPOSE: Use of polypharmacy in the treatment of diabetes is the norm; nonetheless, optimal control is often not achieved. Konjac-glucomannan-based fibre blend (KGB) and American ginseng (AG) have individually been shown to improve glycaemia and CVD risk factors in type 2 diabetes. The aim of this study was to determine whether co-administration of KGB and AG could improve diabetes control beyond conventional treatment. METHOD: Thirty-nine participants with type 2 diabetes (6...
July 7, 2017: European Journal of Nutrition
https://www.readbyqxmd.com/read/28586481/dietary-fiber-and-digestive-health-in-children
#13
Renee Korczak, Alison Kamil, Lisa Fleige, Sharon M Donovan, Joanne L Slavin
Digestive health is an expanding area in nutrition research due to the interest in how food components such as fiber affect gastrointestinal tolerance, stool form, defecation frequency, transit time, and gut microbial composition and metabolic activity. In children, however, digestive health studies that intervene with dietary fiber are limited due to legal and ethical concerns. To better understand if fiber improves digestive health in children, a literature review was conducted to answer the following research question: What are the effect(s) of fiber-containing foods and/or supplements on digestive health outcomes in children? A search of the PubMed database identified a total of 12 studies that fit the inclusion criteria established for this review...
April 1, 2017: Nutrition Reviews
https://www.readbyqxmd.com/read/28582717/modulating-the-phenotype-of-host-macrophages-to-enhance-osteogenesis-in-msc-laden-hydrogels-design-of-a-glucomannan-coating-material
#14
Yiming Niu, Qiu Li, Ruiyu Xie, Shang Liu, Ruibing Wang, Panfei Xing, Yuchen Shi, Yitao Wang, Lei Dong, Chunming Wang
The biomaterials-host interaction is a dynamic process in which macrophages play a vital role of regulation. Depending on the biochemical signals they sense, these highly plastic cells can mediate the immune response against the implanted scaffolds and/or exert regenerative potency to varying extent. Designing appropriate 'exterior signals' for scaffolds may exploit the power of endogenous macrophages to aid the regeneration of engineered tissues. To realise this goal, this study devised an injectable, instantaneously-solidifying coating material (acBSP) based on a unique, macrophage-affinitive glucomannan polysaccharide...
September 2017: Biomaterials
https://www.readbyqxmd.com/read/28579175/an-exopolysaccharide-eps-from-a-lactobacillus-plantarum-br2-with-potential-benefits-for-making-functional-foods
#15
Keerthi Sasikumar, Deepti Kozhummal Vaikkath, Leena Devendra, K Madhavan Nampoothiri
A high molecular weight EPS of glucomannan nature was recovered and purified to get an yield of 2.8±0.5g/L from Lb. plantarum BR2 and it displayed potent antioxidant activity with 29.8% radical scavenging activity and 19% total antioxidant capacity. At 100µg/ml concentration, it is capable of inhibiting the alpha amylase activity by 10% and at 300µg/ml, it drastically inhibited the alpha-glucosidase activity by 67% which indicates its antidiabetic potential. More interestingly, at a concentration level of 0...
October 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28578975/ph-sensitive-drug-delivery-system-based-on-hydrophobic-modified-konjac-glucomannan
#16
Jinling Luan, Kao Wu, Cao Li, Jia Liu, Xuewen Ni, Man Xiao, Yanglin Xu, Ying Kuang, Fatang Jiang
Amphiphilic aliphatic amines grafted konjac glucomannan (KGM-g-AH8, KGM-g-AH12 and KGM-g-AH18) micelles were prepared via a simple two-step synthesis with Schiff's base as the "switch" to achieve intracellular acid-triggered curcumin release. The KGM-g-AH8 self-assembled into spherical nano-micelles (107.6±11.6nm) in an aqueous medium, and presented high curcumin loading capacity as well as good physical stability in 28 days. The in vitro curcumin release behaviors proved the controlled release property and the endosomal/lysosomal pH response of KGM-g-AH8 micelles...
September 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28559619/evaluation-of-different-hydrocolloids-to-improve-dough-rheological-properties-and-bread-quality-of-potato-wheat-flour
#17
Xingli Liu, Taihua Mu, Karim Diego Yamul, Hongnan Sun, Miao Zhang, Jingwang Chen, Marie Laure Fauconnier, Perez Vanina Andrea
The aim of study was to investigate the effect of hydroxylpropylmethylcellulose (HPMC), arabic gum (AG), konjac glucomannan (KG) and apple pectin (AP) at 2% (w/w, potato-wheat flour basis) on the potato-wheat dough (the mass ratio was 1:1) rheological, fermentation and bread making properties. The tan δ of potato-wheat dough was significantly increased upon addition of adding HPMC which was close to wheat dough (0.531). Moreover, dough height during fermentation process was significantly improved on addition of hydrocolloids, with the order of HPMC (23...
May 2017: Journal of Food Science and Technology
https://www.readbyqxmd.com/read/28535423/chromatographic-separation-and-detection-methods-of-aloe-arborescens-miller-constituents-a-systematic-review
#18
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...
July 15, 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
#19
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
#20
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
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