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34 results about "Levoglucosan" patented technology

Levoglucosan (C₆H₁₀O₅) is an organic compound with a six-carbon ring structure formed from the pyrolysis of carbohydrates, such as starch and cellulose. As a result, levoglucosan is often used as a chemical tracer for biomass burning in atmospheric chemistry studies, particularly with respect to airborne particulate matter. Along with other tracers such as potassium, oxalate, and gaseous acetonitrile, levoglucosan has been shown to be highly correlated with regional fires. This is because the gas emitted by the pyrolysis of wood (biomass) contains significant amounts of levoglucosan.

Method for synchronously measuring levoglucosan, mannan and galactosan in aerosol for high performance liquid chromatography-tandem quadrupole mass spectrometry combination

A method for synchronously measuring levoglucosan, mannan and galactosan in aerosol for high performance liquid chromatography-tandem quadrupole mass spectrometry combination includes the steps that levoglucosan, mannan and galactosan in an aerosol sample are subjected to ultrasonic extraction with ultrapure water and detected by means of a high performance liquid chromatography-tandem quadrupolemass spectrometer; ammonia water is adopted as a mobile phase; an electrospray ionization mode suitable for polar molecule analysis is adopted as an ion source of a mass spectrometry, ion source parameters and compound parameters optimized many times are adopted in a mass spectrometric method, and qualitative and quantitative analysis is conducted in an anion and multiple-reaction monitoring mode.By means of the external standard curve method, the linear relation of L, M and G is good in the range of 0.01<-1> microgramme per milliliter, the correlation coefficient is larger than 0.99, the detection limit of L is smaller than 0.005 microgramme per milliliter, the detection limits of M and G are both smaller than 0.01 microgramme per milliliter, experiment repeatability is good, relative standard deviations of repetitive experiments of L, M and G are 1.31%, 4.48% and 1.31% respectively, and the adding standard recovery rates of L, M and G all reach 97% or above.
Owner:何俊

Method for preparing lactic acid by using alkaline-earth metal modified Sn-beta catalyst

The invention discloses a method for preparing lactic acid by using an alkaline-earth metal modified Sn-beta catalyst. The method comprises the following steps: carrying out ion exchange reaction on an Sn-beta catalyst and an alkaline-earth metal solution to prepare the alkaline-earth metal modified catalyst; and mixing the catalyst, a saccharide substrate and a solvent, adding lactic acid, and carrying out lactic acid preparation reaction. In the catalytic reaction process, hydrolysis of levoglucosan and the polysaccharide substrate can be promoted by externally adding lactic acid, Sn is taken as an L acid active site in the reaction, alkaline earth metal ions and adjacent skeleton oxygen are taken as Lewis acid-base pair active sites, and generation of a trans-aldol reaction can be promoted through the synergistic effect of Sn, the alkaline earth metal ions and the adjacent skeleton oxygen, so that the selectivity of lactic acid is improved. Compared with other methods, the method provided by the invention has the advantages of simple catalyst preparation, short reaction time, good catalytic effect, easy industrialization and the like. The substrate used in the catalytic method is suitable for biomass thermal cracking product levoglucosan which can be obtained on a large scale, and has a good effect on high-molecular polysaccharides such as cellulose and inulin.
Owner:XIAMEN UNIV

Method for preparing levoglucosan through rapid pyrolysis of coupling pretreatment biomass

The invention provides a method for preparing levoglucosan through rapid pyrolysis of coupling pretreatment biomass, which comprises the following steps: mixing a biomass raw material with alkali liquor, and carrying out alkali pretreatment to obtain an alkali pretreatment product; carrying out solid-liquid separation on the alkali pretreatment product to obtain solid filter residues, mixing the solid filter residues with a Fenton reagent, and carrying out Fenton pretreatment to obtain a Fenton pretreatment product; carrying out solid-liquid separation on the Fenton pretreatment product to obtain filter residues, washing the filter residues to be neutral, and drying the filter residues to obtain a coupling pretreatment product; and quickly pyrolyzing the coupling pretreatment product, and condensing and pyrolyzing the volatile product to obtain bio-oil containing levodextran. According to the method disclosed by the invention, alkali liquor pretreatment is firstly carried out to mainly remove a large amount of lignin in the biomass, then Fenton pretreatment is carried out to mainly break cellulose and hemicellulose as well as glucosidic bonds between the cellulose and degrade part of hemicellulose, and finally a porous short-chain cellulose enriched substrate is formed, so that higher levoglucosan yield can be achieved.
Owner:SOUTHEAST UNIV

Method for producing carotinoid and single-cell protein via transforming cellulose pyrolytical liquid and levoglucosan through photosynthetic bacteria

The invention relates to photosynthetic bacteria and applications thereof. Cellulose pyrolytical liquid and levoglucosan are utilized to culture the photosynthetic bacteria, and the obtained photosynthetic bacteria can be used for producing carotinoid and single-cell protein and also can be used as a water quality improving agent for aquaculture and sewage treatment or can be used as a leaf fertilizer and the like. The levoglucosan or the cellulose pyrolytical liquid is prepared to form a culture solution, under the conditions of certain loading volume and transformation temperature, the culture solution is cultured for certain time to obtain carotinoid-rich photosynthetic bacteria thallus, and the thallus which is subjected to carotinoid extraction can be used as a single-cell protein feed. The photosynthetic bacteria are utilized to effectively use the high-temperature pyrolysis products of cellulose biomass and the levoglucosan to prepare the carotinoid and the photosynthetic bacteria single-cell protein, the cellulose biomass is effectively utilized, the cellulose biomass with rich sources can be transformed into products with high additional values, wastes are turned into wealth, and the method has good economic and environmental application potentials and a social benefit.
Owner:NANJING NORMAL UNIVERSITY

Method for improving transport capacity and utilization capacity of levodextran in saccharomyces cerevisiae strain

The invention discloses a method for improving transport capacity and utilization capacity of levoglucosan in a saccharomyces cerevisiae strain. The method comprises the following steps of expressing protein with levoglucosan kinase activity in saccharomyces cerevisiae, and establishing a levoglucosan metabolic pathway in the saccharomyces cerevisiae; the method is realized by utilizing a mutant for expressing the transporter Gal2p in a hexose transporter complete-deficiency saccharomyces cerevisiae recombinant strain in which the levodextran metabolic pathway is established, meanwhile, the invention also provides a recombinant saccharomyces cerevisiae strain YLGR341 and a recombinant saccharomyces cerevisiae strain YLGR455 which are used for related expression of the levodextran transporter Gal2pQ341A or Gal2pW455A and the levodextran kinase, Experiments prove that when the method for improving the transport capacity and the utilization capacity of the levoglucosan in the saccharomyces cerevisiae strain is applied to levodextran fermentation, compared with a non-point-mutation strain, the growth of the Gal2p point-mutation strain has obvious advantages, the levodextran utilization capacity is obviously higher than that of the non-point-mutation strain, wherein the point mutation strains YLGR341 and YLGR455 are 3.70 times and 3.72 times of the non-point-mutation strain YLGR00G correspondingly.
Owner:SHANDONG UNIV

A method for preparing levoglucosan from agricultural and forestry waste

ActiveCN109851689BOvercoming the defect of low yieldIncrease contentLiquid productFiltration
The invention discloses a method for producing levoglucosan by using agricultural and forest waste. The method for producing the levoglucosan by using the agricultural and forest waste comprises the following steps of (1) adding the crushed agricultural and forest waste and water into a hydrothermal reaction kettle according to a mass volume ratio of (1 to 1) to (5 to 20); (2) filling the hydrothermal reaction kettle with CO2, sealing the hydrothermal reaction kettle to make the hydrothermal reaction kettle heated to 150-250 DEG C with stirring, and maintaining the temperature for 10-50 minutes; (3) cooling the hydrothermal reaction kettle, collecting a reaction product, and conducting vacuum filtration, separation and drying on the reaction product to obtain a solid product subjected to hydrothermal pre-treatment; (4) placing the solid product in a pyrolysis reactor to make the solid product subjected to pyrolysis in a CO2 atmosphere; and (5) obtaining a liquid product with a high levoglucosan concentration after conducting fractional condensation on the solid product. According to the method for producing the levoglucosan by using the agricultural and forest waste, hydrothermal pre-treatment under the CO2 atmosphere and pyrolysis under the CO2 atmosphere are combined to promote maximum conversion from the agricultural and forest waste to the levoglucosan, and the defect of alow yield of levoglucosan in bio-oil obtained by directly conducting pyrolysis on biomass is overcome.
Owner:HUAZHONG UNIV OF SCI & TECH

Method for simultaneous determination of levo-glucan, mannan and galactan in aerosol by high performance liquid chromatography-tandem quadrupole mass spectrometry

A method for synchronously measuring levoglucosan, mannan and galactosan in aerosol for high performance liquid chromatography-tandem quadrupole mass spectrometry combination includes the steps that levoglucosan, mannan and galactosan in an aerosol sample are subjected to ultrasonic extraction with ultrapure water and detected by means of a high performance liquid chromatography-tandem quadrupolemass spectrometer; ammonia water is adopted as a mobile phase; an electrospray ionization mode suitable for polar molecule analysis is adopted as an ion source of a mass spectrometry, ion source parameters and compound parameters optimized many times are adopted in a mass spectrometric method, and qualitative and quantitative analysis is conducted in an anion and multiple-reaction monitoring mode.By means of the external standard curve method, the linear relation of L, M and G is good in the range of 0.01<-1> microgramme per milliliter, the correlation coefficient is larger than 0.99, the detection limit of L is smaller than 0.005 microgramme per milliliter, the detection limits of M and G are both smaller than 0.01 microgramme per milliliter, experiment repeatability is good, relative standard deviations of repetitive experiments of L, M and G are 1.31%, 4.48% and 1.31% respectively, and the adding standard recovery rates of L, M and G all reach 97% or above.
Owner:何俊
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