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11 results on '"Di, Jipeng"'

9. Laccase-TEMPO-mediated air oxidation of galactomannan for use as paper strengthening agent

Author

Qi Sun, Di Jipeng, and Xianliang Song

Subjects
0106 biological sciences, chemistry.chemical_classification, Laccase, Polymers and Plastics, Organic Chemistry, 02 engineering and technology, 021001 nanoscience & nanotechnology, Polysaccharide, 01 natural sciences, Aldehyde, Folding endurance, Galactomannan, chemistry.chemical_compound, chemistry, 010608 biotechnology, Ultimate tensile strength, Oxidizing agent, Materials Chemistry, 0210 nano-technology, Nuclear chemistry
Abstract

In this study, galactomannans, which are a type of plant polysaccharide, were oxidized by using a laccase and TEMPO-mediated air-oxidation system. The influence of the oxidation conditions, including the laccase doses, oxidation times, and amounts of oxidizing system, on the properties of the paper were investigated. The results showed that the oxidized galactomannans could improve the paper properties. The optimal conditions were as follows: a 60 U/g enzyme dosage; 6-h oxidization time and a 0.1 g TEMPO dosage. When compared with the control paper, the tensile index and folding endurance have been improved by 28.42% and 88.02%, respectively, when 1.5% oxidized galactomannans were used, and for the recycled paper, the increment could reach 126.97% and 43.85% correspondingly. Also, the results of the elemental, FT-IR, and CP/MAS13C NMR analyses demonstrated that some of the hydroxyl of the galactomannans had been transformed into the carboxyl and aldehyde groups.

Published
2017

10. The Galactose Oxidase Air Oxidation of Galactomannans for Use as Paper Strengthening Agents.

Author

Di, Jipeng, Liu, Bingbing, and Song, Xianliang

Subjects
*GALACTOMANNANS, *HORSERADISH peroxidase, *HYDROGEN peroxide, *RECYCLED paper, *MOLECULAR weights, *GALACTOSE
Abstract

Galactomannans are a widely used polysaccharide. In this study, galactomannans were oxidized using galactose oxidase, aided by horseradish peroxidase (HRP) and catalase. Then, a small amount of hydrogen peroxide was used to oxidize the reaction products in order to prepare the paper strengthening agents. The optimal oxidation conditions were investigated according to the properties of the paper, which included the galactose oxidase dosages and concentrations of hydrogen peroxide. It was determined that, when the enzyme dosage was 50 U/g and the hydrogen peroxide concentration was 0.4%, the properties of the paper could be evidently improved with a lower hydrogen peroxide addition. When 1.5% oxidized galactomannans were used, the tensile index and folding endurance were found to have been increased by 23.50% and 110.31%, respectively, when compared with the control. In regard to the recycled paper, the increases were observed to have reached 22.19% and 175%, respectively. The results of the molecular weight, FT-IR, and CP/MAS13C-NMR indicated that a percentage aldehyde and carboxyl groups had been added to the galactomannans. [ABSTRACT FROM AUTHOR]

Published
2020
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11. Comprehensive reutilization of herbal waste: Coproduction of magnolol, honokiol, and β-amyrin from Magnolia officinalisresidue

Author

Xiao, Lukun, Zhao, Anyi, Qiu, Jie, Liu, An, Chen, Sha, Jiang, Jinzhu, Zhang, Jun, Guo, Cong, Di, Jipeng, Cheng, Jintang, Chen, Chang, Hou, Kangxin, Zhang, Aiping, Liu, Yan, and Wang, Caixia

Abstract

Herbal extraction residues (HERs) cause serious environmental pollution and resource waste. In this study, a novel green route was designed for the comprehensive reutilization of all components in HERs, taking Magnolia officinalisresidues (MOR) as an example. The reluctant structure of MOR was first destroyed by alkali pretreatment to release the functional ingredients (magnolol and honokiol) originally remaining in MOR and to make MOR more accessible for hydrolysis. A metal–organic frame material MIL-101(Cr) with a maximum absorption capacity of 255.64 mg g−1was synthesized to absorb the released honokiol and magnolol from the pretreated MOR solutions, and 40 g L−1reducing sugars were obtained with 81.8% enzymatic hydrolysis rate at 10% MOR solid loading. Finally, 382 mg L−1β-amyrin was produced from MOR hydrolysates by an engineered yeast strain. In total, 1 kg honokiol, 8 kg magnolol, and 7.64 kg β-amyrin could produce from 1 ton MOR by this cleaner process with a total economic output of 170,700 RMB.

Published
2023
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