Selective Extraction of ECG from Tea Polyphenols by One Step in Centrifugal Contactor Separators: Modeling and Application

2019 ◽  
Vol 58 (5) ◽  
pp. 2027-2035 ◽  
Author(s):  
Wanru Wang ◽  
Panliang Zhang ◽  
Jian Ou ◽  
Fusong Liu ◽  
Kewen Tang ◽  
...  
Keyword(s):  
Selective Extraction ◽  
Tea Polyphenols ◽  
One Step ◽  
Centrifugal Contactor

Recovery of Tea Polyphenols from Green Tea Waste by Liquid-Liquid Extraction

2011 ◽  
Vol 396-398 ◽  
pp. 1592-1595
Author(s):  
Zhong Jian Li ◽  
Zhe Wei ◽  
Wei Xiao ◽  
Jun Wang ◽  
Fu An Wu
Keyword(s):  
Distribution Coefficient ◽  
Green Tea ◽  
Ph Value ◽  
New Technology ◽  
Selective Extraction ◽  
Extraction Process ◽  
Tea Polyphenols ◽  
Extraction Temperature ◽  
Tea Waste ◽  
Equilibrium Data

Tea (Camellia sinensis L.) has became one of the most consumed beverages in the world in the past five thousand years, and tea polyphenols (TPs) are important organic acids widely used in chemical, pharmaceutical, food and other industries, which have been shown to exhibit various biological and pharmacological properties. In order to look for new technology of downstream process for TPs separation from green tea waste, selective extraction of TPs with 12 varieties of solvents were carried out, the distribution coefficient and equilibrium experiments at various temperatures were described by extraction isotherms model. The results indicated that the optimum solvent conditions were as follow: extractent was glyceryl triacetate, extraction temperature range was 20~30°C, pH value of crude TPs and reextractant were 3.17 and 9, respectively. Equilibrium data of TPs were successfully fitted to Henry isotherm, the distribution coefficient decreases with the increasing of the temperature, which showing an exothermic adsorption process. The data obtained is useful in the designing of solvent extraction process for the recovery of TPs from green tea waste.

A Novel Way of Separation and Preparation Noncaffeine Tea Polyphenols from Green Tea Waste

2012 ◽  
Vol 550-553 ◽  
pp. 1875-1880 ◽  
Author(s):  
He Ping Tan ◽  
Huai Ping Li ◽  
Hang Song ◽  
Wen Ping Xu ◽  
Chi Guan ◽  
...  
Keyword(s):  
Green Tea ◽  
Column Chromatography ◽  
High Performance ◽  
Ethanol Solution ◽  
Tea Polyphenols ◽  
Raw Material ◽  
Environment Friendly ◽  
Tea Waste ◽  
One Step ◽  
The Stability

A simple, clean and economical way of separation and preparation noncaffeine tea polyphenols from green tea waste in one-step by Sephadex LH-20 column chromatography was developed. 20% (v/v) ethanol solution was used for removing caffeine and other components in the first stepwise elution, and tea polyphenols was eluted with 60% (v/v) ethanol solution by using reversed flow in the second stepwise elution. The yield of tea polyphenols above 11% with the purity about 98% and the content of catechins more than 91%, and the content of caffeine in tea polyphenols have not been detected by high-performance liquid chromatography. The recovery of tea polyphenols by column chromatography were about 86%, and the stability of preparative way is very good. Compared with conventional extraction and decaffeination ways, this way has more excellent advantages, such as cheaper raw material, no toxic residues, higher yield, commercially feasible and environment friendly.

scholarly journals One-step and selective extraction of nickel from nickel-based superalloy by molten zinc

2021 ◽  
Vol 31 (6) ◽  
pp. 1828-1841
Author(s):  
Qing-hua TIAN ◽  
Xiang-dong GAN ◽  
Da-wei YU ◽  
Fu-hui CUI ◽  
Xue-yi GUO
Keyword(s):  
Selective Extraction ◽  
Molten Zinc ◽  
Nickel Based Superalloy ◽  
One Step

scholarly journals One-Step Method for Preparing Dispersive Tea Polyphenol/Graphene Nanosheets Enhanced with Anticorrosion Performance

Coatings ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 731
Author(s):  
Youwei Guo ◽  
Guoqing Xiao ◽  
Wei Zhang ◽  
Nange Zhang ◽  
Chunling Chen ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Electrochemical Impedance ◽  
Layer Structure ◽  
Graphene Nanosheets ◽  
Tea Polyphenols ◽  
Anticorrosion Property ◽  
Tea Polyphenol ◽  
X Ray ◽  
Uniform Dispersion ◽  
One Step

Water-dispersible and anticorrosion nanocomposites have attracted extensive attention. In this study, tea polyphenol (TP)/graphene (GE) was fabricated with a one-step route. The preparation and modification of graphene nanosheets was carried out by graphene employing tea polyphenols as reduction and functionalization reagents. Our study adopted a nontoxic reductant without an extra functionalization reagent. This method is convenient, inexpensive, and environmentally friendly. The final functionalized graphene nanosheets had a single-layer structure. For evaluating performance, Raman spectroscopy was adapted for evaluating π–π interactions between TP and graphene. Elemental and structural composition was analyzed using X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). Sample morphology was characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Results indicated that the TP could effectively augment the dispersive performance of graphene in the solution. The durable anticorrosion capacity of the epoxy matrix noticeably increased after adding the appropriate amount of tea polyphenols–graphene (TPG) (0.3 wt.%). Electrochemical impedance spectroscopy (EIS) studies showed that the impedance of artificial defects was enhanced. The anticorrosion property was attributed to the uniform dispersion of graphene by adding TP.

Aptamer entrapment in microfluidic channel using one-step sol-gel process, in view of the integration of a new selective extraction phase for lab-on-a-chip

2017 ◽  
Vol 38 (19) ◽  
pp. 2456-2461 ◽  
Author(s):  
Camille Perréard ◽  
Fanny d'Orlyé ◽  
Sophie Griveau ◽  
Baohong Liu ◽  
Fethi Bedioui ◽  
...  
Keyword(s):  
Sol Gel ◽  
Microfluidic Channel ◽  
Lab On A Chip ◽  
Selective Extraction ◽  
Sol Gel Process ◽  
One Step ◽  
Extraction Phase

scholarly journals Inner Surface Hydrophilic Modification of PVDF Membrane with Tea Polyphenols/Silica Composite Coating

Polymers ◽  
2021 ◽  
Vol 13 (23) ◽  
pp. 4186
Author(s):  
Qiang Xu ◽  
Xiaoli Ji ◽  
Jiaying Tian ◽  
Xiaogang Jin ◽  
Lili Wu
Keyword(s):  
Composite Coating ◽  
Polyvinylidene Fluoride ◽  
Water Flux ◽  
Tea Polyphenols ◽  
Pvdf Membrane ◽  
Hydrophilic Modification ◽  
Silica Composite ◽  
Inner Surface ◽  
One Step ◽  
Modified Membrane

The use of Polyvinylidene fluoride (PVDF) membranes is constrained in wastewater treatment because of their hydrophobic nature. Therefore, a large number of researchers have been working on the hydrophilic modification of their surfaces. In this work, a superhydrophilic tea polyphenols/silica composite coating was developed by a one-step process. The composite coating can achieve not only superhydrophilic modification of the surface, but also the inner surface of the porous PVDF membrane, which endows the modified membrane with excellent water permeability. The modified membrane possesses ultrahigh water flux (15,353 L·m−2·h−1). Besides this, the modified membrane can realize a highly efficient separation of oil/water emulsions (above 96%).

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