50-70-4Relevant articles and documents
THE PAIRED ELECTROCHEMICAL SYNTHESIS OF GLUCONIC ACID AND SORBITOL
Li, Hongmei,Li, Wei,Guo, Zicheng,Gu, Dengping,Cai, Shengmin,Fujishima, Akira
, p. 928 - 934 (1995)
Gluconic acid and sorbitol are obtained simultaneously both with 90percent yields by paired electolysis of glucose, with a Pb sheet cathode and a dimension stable anode (DSA) in a press filtration diaphragm cell.The anolyte is composed from 66.7percent glucose and 2percent NaBr, and the catholyte from 66.7percent glucose and 2.5percent Na2SO4, respectively.The electrolysis was performed at the temperature of 60 deg C, at the current density of 50 mA cm-2, Qr is 110percent.At this optimum conditions the current efficiencies for both gluconic acid and sorbitol are higher than 80percent.
Structure of a marsupial-mild trisaccharide.
Messer,Trifonoff,Stern,Collins,Bradbury
, p. 327 - 334 (1980)
A trisaccharide, which is a major carbohydrate component of the milk of the tammar wallaby and the grey kangaroo, has been identified by chemical, enzymic, g.l.c.-m.s., and n.m.r. methods as O-beta-D-galactopyranosyl-(1 yields 3)-O-beta-D-galactopyranosyl-(1 yields 4)-D-glucose (3'-galactosyl-lactose).
Bimetallic Ru:Ni/MCM-48 catalysts for the effective hydrogenation of D-glucose into sorbitol
Romero, Alberto,Nieto-Márquez, Antonio,Alonso, Esther
, p. 49 - 59 (2017)
Three different bimetallic Ru:Ni catalysts supported on a mesoporous silica MCM-48 were prepared by consecutive wet impregnations, with a total metal loading of ca. 3% (w w?1). Ru:Ni ratios spanned in the range of 0.15–1.39 (w w?1) and were compared with the corresponding monometallic Ni/MCM-48. The catalysts so prepared were characterized by X-Ray Diffraction, Transmission Electron Microscopy, adsorption/desorption of N2, Temperature Programmed Reduction, NH3 ? TPD and Atomic Absorption, and tested in the liquid phase hydrogenation of D-glucose into sorbitol in the temperature range 120–140 °C under 2.5 MPa of H2 pressure. Bimetallic catalysts with Ru:Ni ratios higher than 0.45 enhanced the catalytic behavior of the monometallic Ni/MCM-48 in the reaction, increasing the reaction rate and showing complete selectivity to sorbitol by minimizing the production of mannitol. Ru:Ni/MCM-48 (0.45) was recovered from the reaction media and tested for three reaction cycles, showing good stability under the selected experimental conditions.
A Robust and Highly Selective Catalytic System of Copper–Silica Nanocomposite and 1-Butanol in Fructose Hydrogenation to Mannitol
Upare, Pravin P.,Hwang, Young Kyu,Kim, Jin Chul,Lee, Jeong Hyeon,Kwak, Sang Kyu,Hwang, Dong Won
, p. 5050 - 5057 (2020)
We report for the first time the selective production of mannitol, a low-calorie sweetener and an important pharmaceutical ingredient, from fructose using Cu?SiO2 nanocomposite as catalyst and 1-butanol as solvent. When compared with water and ethanol, a lower fructose solubility was achieved in 1-butanol, which caused a lower fructose conversion and higher mannitol selectivity by reducing formation of side products. Among various Cu-based catalysts in 1-butanol, Cu(80)?SiO2 nanocomposite gave an unprecedented mannitol (83 %) and sorbitol (15 %) yield at 120 °C, 35 bar H2, and 10 h reaction time. More importantly, this catalyst did not show any Cu leaching and its physicochemical properties were maintained after liquid-phase fructose hydrogenation whereas other Cu-based catalysts such as Cu(32)?Cr2O and Cu(66)?ZnO did show significant leaching of Cu and Cr. Thus, Cu(80)?SiO2 nanocomposite and 1-butanol are regarded as a robust and highly efficient catalytic system for the selective hydrogenation of fructose to mannitol. Also, density functional theory calculations supported that in addition to the stable initial structure of adsorbed fructose, the mannitol pathway was more thermodynamically favorable than the sorbitol pathway. Notably, the highly pure mannitol (99 %) could be recovered from the sorbitol-containing 1-butanol solution by simple filtration. Therefore, the present protocol is a novel and effective method to produce pure mannitol from fructose in both an environmental and an industrial context.
Transfer hydrogenation of cellulose to sugar alcohols over supported ruthenium catalysts
Kobayashi, Hirokazu,Matsuhashi, Hisateru,Komanoya, Tasuku,Hara, Kenji,Fukuoka, Atsushi
, p. 2366 - 2368 (2011)
Ru/C catalysts are active for the conversion of cellulose using 2-propanol or H2 of 0.8 MPa as sources of hydrogen, whereas the Ru/Al 2O3 catalyst is inactive in both reactions, indicating that the Ru/C catalysts are remarkably effective for the cellulose conversion.
Chemical analysis of new water-soluble (1→6)-, (1→4)-α, β-glucan and water-insoluble (1→3)-, (1→4)-β-glucan (Calocyban) from alkaline extract of an edible mushroom, Calocybe indica (Dudh Chattu)
Mandal, Soumitra,Maity, Kankan K.,Bhunia, Sanjoy K.,Dey, Biswajit,Patra, Sukesh,Sikdar, Samir R.,Islam, Syed S.
, p. 2657 - 2663 (2010)
Two different glucans (PS-I, water-soluble; and PS-II, water-insoluble) were isolated from the alkaline extract of fruit bodies of an edible mushroom Calocybe indica. On the basis of acid hydrolysis, methylation analysis, periodate oxidation, and NMR anal
Structural characterization and anti-inflammatory activity of a linear β-d-glucan isolated from Pleurotus sajor-caju
Silveira, Marcia L.L.,Smiderle, Fhernanda R.,Moraes, Carla Porto,Borato, Débora G.,Baggio, Cristiane H.,Ruthes, Andrea Caroline,Wisbeck, Elisabeth,Sassaki, Guilherme L.,Cipriani, Thales R.,Furlan, Sandra A.,Iacomini, Marcello
, p. 588 - 596 (2014)
Glucans comprise an important class of polysaccharides present in basidiomycetes with potential biological activities. A (1 → 3)-β-d-glucan was isolated from Pleurotus sajor-caju via extraction with hot water followed by fractionation by freeze-thawing and finally by dimethyl sulfoxide extraction. The purified polysaccharide showed a 13C-NMR spectrum with six signals consisting of a linear glucan with a β-anomeric signal at 102.8 ppm and a signal at 86.1 ppm relative to O-3 substitution. The other signals at 76.2, 72.9, 68.3, and 60.8 ppm were attributed to C5, C2, C4, and C6, respectively. This structure was confirmed by methylation analysis, and HSQC studies. The β-d-glucan from P. sajor-caju presented an immunomodulatory activity on THP-1 macrophages, inhibited the inflammatory phase of nociception induced by formalin in mice, and reduced the number of total leukocytes and myeloperoxidase levels induced by LPS. Taken together, these results demonstrate that this β-d-glucan exhibits a significant anti-inflammatory activity.
Isolation and characterization of non-sulfated and sulfated triterpenoid saponins from Fagonia indica
Kanwal, Nayab,Adhikari, Achyut,Hameed, Abdul,Hafizur, Rahman M.,Musharraf, Syed Ghulam
, p. 151 - 159 (2017)
Seven previously undescribed, sulfated triterpenoid glycosides, named nayabin A-G along with a known triterpenoid glycoside were isolated from the whole plant of Fagonia indica. Their structures were elucidated through spectral studies including 1D- (1H and 13C), 2D-NMR spectroscopy (HSQC, HMBC, COSY and NOESY), and mass spectrometry (ESI-MS/MS). β-D-Glucopyranosyl 3β-hydroxy-23-O-β-D-glucopyranosyloxy-taraxast-20-en-28-oate, a known compound exerts glucose-dependent insulin secretory activity, which seems to exhibit a decreased risk of drug-induced hypoglycemia and may offer distinct advantages as anti-diabetic agent.
Pt nanocatalysts supported on reduced graphene oxide for selective conversion of cellulose or cellobiose to sorbitol
Wang, Ding,Niu, Wenqi,Tan, Minghui,Wu, Mingbo,Zheng, Xuejun,Li, Yanpeng,Tsubaki, Noritatsu
, p. 1398 - 1406 (2014)
Pt nanocatalysts loaded on reduced graphene oxide (Pt/RGO) were prepared by means of a convenient microwave-assisted reduction approach with ethylene glycol as reductant. The conversion of cellulose or cellobiose into sorbitol was used as an application reaction to investigate their catalytic performance. Various metal nanocatalysts loaded on RGO were compared and RGO-supported Pt exhibited the highest catalytic activity with 91.5 % of sorbitol yield from cellobiose. The catalytic performances of Pt nanocatalysts supported on different carbon materials or on silica support were also compared. The results showed that RGO was the best catalyst support, and the yield of sorbitol was as high as 91.5 % from cellobiose and 58.9 % from cellulose, respectively. The improvement of catalytic activity was attributed to the appropriate Pt particle size and hydrogen spillover effect of Pt/RGO catalyst. Interestingly, the size and dispersion of supported Pt particles could be easily regulated by convenient adjustment of the microwave heating temperature. The catalytic performance was found to initially increase and then decrease with increasing particle size. The optimum Pt particle size was 3.6 nm. These findings may offer useful guidelines for designing novel catalysts with beneficial catalytic performance for biomass conversion. Support group: Pt nanocatalysts loaded on reduced graphene oxide are prepared by a microwave-assisted ethylene glycol reduction method, and present high activity and selectivity for the conversion of cellobiose or cellulose to sorbitol. The high catalytic activity is attributed to the synergistic effects of reduced graphene oxide and the supported Pt nanoparticles.
Glucose Hydrogenation to Sorbitol over a Skeletal Ni-P Amorphous Alloy Catalyst (Raney Ni-P)
Li, Hexing,Wang, Weijiang,Fa Deng, Jing
, p. 257 - 260 (2000)
A skeletal Ni-P amorphous alloy catalyst (Raney Ni-P) was prepared by alkali leaching of a Ni-Al-P amorphous precursor obtained by the rapid quenching technique of a melting solution containing Ni, Al, and P. This catalyst showed higher turnover rates (per surface Ni atom) than Raney Ni for the hydrogenation of glucose to sorbitol, apparently as a result of promotion of Ni-active sites by phosphorus. The Raney Ni-P catalysts gave turnover rates similar to those measured on Ni-P amorphous alloys without Al, but they had a significantly higher density of Ni surface atoms. As a result, Raney Ni-P catalysts showed superior specific hydrogenation rates (per gram catalyst) than either Raney Ni or Ni-P amorphous alloys.
