Polysaccharide Based Polymers Produced by Scabby Cankered Cactus Pear (Opuntia ficus-indica L.) Infected by Neofusicoccum batangarum: Composition, Structure, and Chemico-Physical Properties

Neofusiccocum batangarum is the causal agent of scabby canker of cactus pear (Opuntia ficus-indica L.). The symptoms of this disease are characterized by crusty, perennial cankers, with a leathery, brown halo. Characteristically, a viscous polysaccharide exudate, caking on contact with air, leaks from cankers and forms strips or cerebriform masses on the surface of cactus pear cladodes. When this polysaccharide mass was partial purified, surprisingly, generated a gel. The TLC analysis and the HPLC profile of methyl 2-(polyhydroxyalkyl)-3-(o-tolylthiocarbomoyl)-thiazolidine-4R-carboxylates obtained from the mixture of monosaccharides produced by acid hydrolysis of the three EPSs examined in this research work [the polysaccharide component of the exudate (EPSC) and the EPSs extracted from asymptomatic (EPSH) and symptomatic (EPSD) cladodes] showed the presence of d-galactose, l-rhamnose, and d-glucose in a 1:1:0.5 ratio in EPSC while d-galactose, l-rhamnose, d-glucose, and d-xylose at the same ratio were observed in EPSH and EPSD. The presence of uronic acid residues in EPSC was also showed by solid state NMR and IR investigation. Furthermore, this manuscript reports the chemical-physical characterization of the gel produced by the infected cactus pear.

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Morphological characterization of cactus pear (Opuntia ficus-indica) accessions from Agadir, Morocco

Acta Horticulturae ◽

10.17660/actahortic.2019.1247.23 ◽

2019 ◽

pp. 163-170

Author(s):

M. Nefzaoui ◽

M.A. Lira ◽

M. Boujghagh ◽

S.M. Udupa ◽

M. Louhaichi

Keyword(s):

Morphological Characterization ◽

Cactus Pear ◽

Opuntia Ficus Indica

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Synthesis of TiO2 – Water Nanofluids for its Viscosity and Dispersion Stability Study

Journal of Nano Research ◽

10.4028/www.scientific.net/jnanor.24.26 ◽

2013 ◽

Vol 24 ◽

pp. 26-33 ◽

Cited By ~ 2

Author(s):

Rohit S. Khedkar ◽

Shriram S. Sonawane ◽

Kalais L. Wasewar

Keyword(s):

Research Work ◽

Titanium Isopropoxide ◽

Stability Study ◽

Dispersion Stability ◽

Titanium Dioxide Nanoparticle ◽

Unique Method ◽

Increasing Trends ◽

Hydrolysis Of ◽

Dispersion Of Nanoparticles

In the present research work, an anatase structure titanium dioxide nanoparticle was synthesized by hydrolysis of titanium isopropoxide in the presence and absence of ultrasonication. The resultant product suspension was peptized for getting narrow size distribution. The synthesized nanoparticles are used for preparation of nanofluids with different volume percent loading of nanoparticles in water ranging from 1% to 5%. The characterization of particles was carried out by TEM, XRD. Our result shows that the use of ultrasonic technique has a significant effect on the homogeneity and then size of TiO2nanoparticles. Viscosity of nanofluids was demonstrated with rheometer (TA instruments). Viscosity results confirmed Newtonian behavior of nanofluids and showing increasing trends with addition of nanoparticles in base fluids. The dispersion of nanoparticles in nanofluids is studied with unique method of UV visible spectrophotometer, which confirm good dispersion stability prepared nanofluid of 50 hrs.

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CHARACTERIZATION OF SEEDLINGS OBTAINED FROM OPEN POLLINATED ´GIALLA´ CACTUS PEAR (OPUNTIA FICUS-INDICA)

Acta Horticulturae ◽

10.17660/actahortic.2006.728.13 ◽

2006 ◽

pp. 105-110 ◽

Cited By ~ 4

Author(s):

G. Nieddu ◽

I. Chessa ◽

A. Barberis

Keyword(s):

Cactus Pear ◽

Opuntia Ficus Indica

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Structure of the Capsular Polysaccharide of Klebsiella K-type 56

Canadian Journal of Chemistry ◽

10.1139/v73-450 ◽

1973 ◽

Vol 51 (18) ◽

pp. 3021-3026 ◽

Cited By ~ 19

Author(s):

Yuen-Min Choy ◽

Guy G. S. Dutton

Keyword(s):

Uronic Acid ◽

Capsular Polysaccharide ◽

Periodate Oxidation ◽

Side Chain ◽

Partial Hydrolysis ◽

Hydrolysis Of

Methylation, periodate oxidation, and partial hydrolysis studies on the capsular polysaccharide of Klebsiella K-type 56 show the structure to be a repeating unit consisting of[Formula: see text]The nature of the anomeric linkages was determined by p.m.r. spectroscopy of isolated oligosaccharides. The position of the L-rhamnose side chain was defined by characterization of the di- and tetrasaccharides obtained by partial hydrolysis of the fully methylated polysaccharide.This structure represents the first capsular polysaccharide lacking uronic acid to be studied in the genus Klebsiella.

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CHARACTERIZATION OF FLAVONOL AGLYCONS IN CACTUS PEAR (OPUNTIA FICUS-INDICA) FRUIT USING PREPARATIONS OF CELLULASES AND PECTINASES

Acta Horticulturae ◽

10.17660/actahortic.2013.995.31 ◽

2013 ◽

pp. 263-267

Author(s):

T.E. Moussa-Ayoub ◽

L.W. Kroh ◽

E. Abd El-Hady ◽

H. Omran ◽

S.K. El-Samahy ◽

...

Keyword(s):

Cactus Pear ◽

Opuntia Ficus Indica

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The formation of hex-5-enopyranosides and their selective hydrolysis in methylated polysaccharides

Canadian Journal of Chemistry ◽

10.1139/v78-111 ◽

1978 ◽

Vol 56 (5) ◽

pp. 680-684 ◽

Cited By ~ 4

Author(s):

Gerald Oliver Aspinall ◽

Karl-Gunnar Rosell

Keyword(s):

Uronic Acid ◽

Gum Arabic ◽

Hydroxyl Groups ◽

Triphenyl Phosphite ◽

Reaction Sequence ◽

Selective Hydrolysis ◽

Acidic Polysaccharides ◽

Hydrolysis Of ◽

Derivatives Of

The introduction of hex-5-enopyranoside residues into methylated acidic polysaccharides is effected by reduction of uronic acid residues, followed by reaction with triphenyl phosphite methiodide, and dehydroiodination. The selective hydrolysis of hex-5-enopyranosidic linkages with characterization of the 6-deoxyglycos-5-uloses thus formed and location of the aglyconic hydroxyl groups thus exposed has been demonstrated for methylated derivatives of birch xylan and gum arabic. The reaction sequence provides a new method for linkage analysis of acidic polysaccharides.

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ChemInform Abstract: Chemical Characterization of a New 5,7-Diamino-3,5,7,9-tetradeoxynonulosonic Acid (I) Released by Mild Acid Hydrolysis of the Legionella pneumophila Serogroup 1 Lipopolysaccharide.

ChemInform ◽

10.1002/chin.199807224 ◽

2010 ◽

Vol 29 (7) ◽

pp. no-no

Author(s):

YU. A. KNIREL ◽

H. MOLL ◽

J. H. HELBIG ◽

U. ZAEHRINGER

Keyword(s):

Acid Hydrolysis ◽

Legionella Pneumophila ◽

Chemical Characterization ◽

Mild Acid Hydrolysis ◽

Hydrolysis Of ◽

Mild Acid

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Pretreatment of Switchgrass for Production of Glucose via Sulfonic Acid-Impregnated Activated Carbon

Processes ◽

10.3390/pr9030504 ◽

2021 ◽

Vol 9 (3) ◽

pp. 504

Author(s):

Yane Ansanay ◽

Praveen Kolar ◽

Ratna Sharma-Shivappa ◽

Jay Cheng ◽

Consuelo Arellano

Keyword(s):

Activated Carbon ◽

Sulfonic Acid ◽

Solid Acid ◽

Methanesulfonic Acid ◽

Biofuel Production ◽

Acid Catalysts ◽

Effects Of Temperature ◽

Carbon Catalysts ◽

Hydrolysis Of

In the present research, activated carbon-supported sulfonic acid catalysts were synthesized and tested as pretreatment agents for the conversion of switchgrass into glucose. The catalysts were synthesized by reacting sulfuric acid, methanesulfonic acid, and p-toluenesulfonic acid with activated carbon. The characterization of catalysts suggested an increase in surface acidities, while surface area and pore volumes decreased because of sulfonation. Batch experiments were performed in 125 mL serum bottles to investigate the effects of temperature (30, 60, and 90 °C), reaction time (90 and 120 min) on the yields of glucose. Enzymatic hydrolysis of pretreated switchgrass using Ctec2 yielded up to 57.13% glucose. Durability tests indicated that sulfonic solid-impregnated carbon catalysts were able to maintain activity even after three cycles. From the results obtained, the solid acid catalysts appear to serve as effective pretreatment agents and can potentially reduce the use of conventional liquid acids and bases in biomass-into-biofuel production.

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