Liquid–liquid/solid three-phase high-speed counter-current chromatography based on O-carboxymethyl chitosan-functionalized multi-walled carbon nanotubes as solvent additive

RSC Advances ◽  
2014 ◽  
Vol 4 (50) ◽  
pp. 26231-26239 ◽  
Author(s):  
Yanjuan Liu ◽  
Yongfeng Liu ◽  
Gaohong Wang ◽  
Duolong Di
Keyword(s):  
High Speed ◽  
Solvent System ◽  
Carboxymethyl Chitosan ◽  
System P ◽  
Three Phase ◽  
Multi Walled Carbon Nanotubes ◽  
Carbon Nano Tubes ◽  
Solvent Additive ◽  
Walled Carbon Nanotubes ◽  
Counter Current

A new liquid–liquid/solid three phase HSCCC system was established based on O-carboxymethyl chitosan-functionalized multi-walled carbon nano tubes as additive of biphasic solvent system.

Use of O-carboxymethyl chitosan in high-speed counter-current chromatography: a novel additive for a biphasic solvent system

2014 ◽  
Vol 38 (3) ◽  
pp. 1150-1157 ◽  
Author(s):  
Yanjuan Liu ◽  
Gaohong Wang ◽  
Xinyi Huang ◽  
Yongfeng Liu ◽  
Duolong Di
Keyword(s):  
High Speed ◽  
Solvent System ◽  
Carboxymethyl Chitosan ◽  
Separation And Purification ◽  
Active Constituents ◽  
System P ◽  
Natural Plants ◽  
Counter Current

A novel additive,O-carboxymethyl chitosan, for high-speed counter-current chromatography was found and evaluated for the separation and purification of active constituents from natural plants.

scholarly journals Efficient Preparation of Bafilomycin A1 from Marine Streptomyces lohii Fermentation Using Three-Phase Extraction and High-Speed Counter-Current Chromatography

Marine Drugs ◽  
2020 ◽  
Vol 18 (6) ◽  
pp. 332
Author(s):  
Ye Yuan ◽  
Xiaoping He ◽  
Tingting Wang ◽  
Xingwang Zhang ◽  
Zhong Li ◽  
...  
Keyword(s):  
Crude Extract ◽  
High Speed ◽  
Solvent System ◽  
Bafilomycin A1 ◽  
Middle Phase ◽  
Two Phase ◽  
Rapid Separation ◽  
Lower Phase ◽  
Three Phase ◽  
Counter Current

An efficient strategy was developed for the rapid separation and enrichment of bafilomycin A1 (baf A1) from a crude extract of the marine microorganism Streptomyces lohii fermentation. This strategy comprises liquid−liquid extraction (LLE) with a three-phase solvent system (n-hexane–ethyl acetate–acetonitrile–water = 7:3:5:5, v/v/v/v) followed by separation using high-speed counter-current chromatography (HSCCC). The results showed that a 480.2-mg fraction of baf A1-enriched extract in the middle phase of the three-phase solvent system was prepared from 4.9 g of crude extract after two consecutive one-step operations. Over 99% of soybean oil, the main hydrophobic waste in the crude extract, and the majority of hydrophilic impurities were distributed in the upper and lower phase, respectively. HSCCC was used with a two-phase solvent system composed of n-hexane–acetonitrile–water (15:8:12, v/v/v) to isolate and purify baf A1 from the middle phase fraction, which yielded 77.4 mg of baf A1 with > 95% purity within 90 min. The overall recovery of baf A1 in the process was determined to be 95.7%. The use of a three-phase solvent system represents a novel strategy for the simultaneous removal of hydrophobic oil and hydrophilic impurities from a microbial fermentation extract.

Comprehensive separation of secondary metabolites in natural products by high-speed counter-current chromatography using a three-phase solvent system

2007 ◽  
Vol 1151 (1-2) ◽  
pp. 74-81 ◽  
Author(s):  
Akio Yanagida ◽  
Yutaka Yamakawa ◽  
Ryoko Noji ◽  
Ako Oda ◽  
Heisaburo Shindo ◽  
...  
Keyword(s):  
Natural Products ◽  
Secondary Metabolites ◽  
High Speed ◽  
Solvent System ◽  
Three Phase ◽  
Counter Current

Length sorting of multi-walled carbon nanotubes by high-speed centrifugation

Carbon ◽  
2007 ◽  
Vol 45 (11) ◽  
pp. 2311-2313 ◽  
Author(s):  
Qing-Ping Feng ◽  
Xu-Ming Xie ◽  
Yi-Tao Liu ◽  
Yan-Fang Gao ◽  
Xiao-Hao Wang ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
High Speed ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

scholarly journals Pyrolyzing Renewable Sugar and Taurine on the Surface of Multi-Walled Carbon Nanotubes as Heterogeneous Catalysts for Hydroxymethylfurfural Production

Catalysts ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 517 ◽  
Author(s):  
Huiping Ji ◽  
Jie Fu ◽  
Tianfu Wang
Keyword(s):  
Carbon Nanotubes ◽  
Heterogeneous Catalysts ◽  
Metal Salt ◽  
Textural Properties ◽  
Solvent System ◽  
Hydrothermal Stability ◽  
Transportation Fuels ◽  
Water Solvent ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Conversion of biorenewable feedstocks into transportation fuels or chemicals likely necessitates the development of novel heterogeneous catalysts with good hydrothermal stability, due to the nature of highly oxygenated biomass compounds and the prevalence of water as a processing solvent. The use of carbon-based materials, derived from sugars as catalyst precursors, can achieve hydrothermal stability while simultaneously realizing the goal of sustainability. In this work, the simultaneous pyrolysis of glucose and taurine in the presence of multi-walled carbon nanotubes (MWCNTs), to obtain versatile solid acids, has been demonstrated. Structural and textural properties of the catalysts have been characterized by TEM, TGA, and XPS. Additionally, solid state nuclear magnetic resonance (ssNMR) spectroscopy has been exploited to elucidate the chemical nature of carbon species deposited on the surface of MWCNTs. Al(OTf)3, a model Lewis acidic metal salt, has been successfully supported on sulfonic groups tethered to MWCNTs. This catalyst has been tested for C6 sugar dehydration for the production of HMF in a tetrahydrofuran (THF)/water solvent system with good recyclability.

Liquid-liquid/solid three-phase high-speed counter-current chromatography, a new technique for separation of polyphenols from Geranium wilfordii Maxim

2012 ◽  
Vol 35 (16) ◽  
pp. 2146-2151 ◽  
Author(s):  
Dan Liu ◽  
Yan Ma ◽  
Ming Gu ◽  
Jan-Christer Janson ◽  
Changhai Wang ◽  
...  
Keyword(s):  
High Speed ◽  
New Technique ◽  
Three Phase ◽  
A New Technique ◽  
Counter Current
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