Extraction and Purification of Tea Polyphenols and EGCG

2013 ◽  
Vol 662 ◽  
pp. 392-395 ◽  
Author(s):  
Yan Hua Gao ◽  
Ying Chen ◽  
Zhen Xi Wang
Keyword(s):  
Green Tea ◽  
Silica Gel ◽  
Hollow Fiber ◽  
Membrane Filtration ◽  
Hollow Fiber Membrane ◽  
Tea Polyphenols ◽  
Fiber Membrane ◽  
Extraction And Purification ◽  
Column Chromatographic

The extraction and purification of tea polyphenols(TP) and EGCG from green tea extraction by nano-membrane filtration, resins absorption and column chromatographic exctration(CCE) were studied. The results indicated that the concentrations of TP and EGCG respectively increased to 35.21% and 13.56% after separated by the hollow fiber membrane with the molecular of 1.0×104. And then, after the absorption of polyamide resins, the concentrations further increased to 95.51% and 52.56%. Finally, the product with the EGCG concentration of 98% was obtained by silica gel CCE method.

Study on the Technology of Extraction and Purification of Tea Polyphenols and EGCG

2013 ◽  
Vol 781-784 ◽  
pp. 1866-1869
Author(s):  
Yan Hua Gao ◽  
Ying Chen ◽  
Zhen Xi Wang
Keyword(s):  
Old Age ◽  
Membrane Filtration ◽  
Hollow Fiber Membrane ◽  
Epigallocatechin Gallate ◽  
Tea Polyphenols ◽  
Optimal Conditions ◽  
Fiber Membrane ◽  
Tea Leaves ◽  
Extraction And Purification ◽  
Column Chromatographic

Four kinds of different methods was used to extract the tea polyphenols (TP) and epigallocatechin gallate (EGCG) from the fresh old age tea leaves. The extraction liquor obtained under the optimal conditions was further purified by membrane filtration, resins absorption and column chromatographic exctration (CCE). The results indicated that the concentrations of TP and EGCG respectively increased to 96.1% and 60.5% after separated by the hollow fiber membrane and resins absorption. And then, after the separation by silica gel CCE method, the EGCG concentration was more than 98%.

scholarly journals The Effect of Ca and Mg Ions on the Filtration Profile of Sodium Alginate Solution in a Polyethersulfone-2-(methacryloyloxy) Ethyl Phosphorylchloline Membrane

Water ◽  
2018 ◽  
Vol 10 (9) ◽  
pp. 1207 ◽  
Author(s):  
Nasrul Arahman ◽  
Suffriandy Satria ◽  
Fachrul Razi ◽  
M. Bilad
Keyword(s):  
Sodium Alginate ◽  
Relative Permeability ◽  
Hollow Fiber ◽  
Membrane Fouling ◽  
Membrane Filtration ◽  
Hollow Fiber Membrane ◽  
Pure Water ◽  
Fiber Membrane ◽  
Cake Layer ◽  
The Stability

The efforts to improve the stability of membrane filtration in applications for wastewater treatment or the purification of drinking water still dominate the research in the field of membrane technology. Various factors that cause membrane fouling have been explored to find the solution for improving the stability of the filtration and prolong membrane lifetime. The present work explains the filtration performance of a hollow fiber membrane that is fabricated from polyethersulfone-2-(methacryloyloxy) ethyl phosphorylchloline while using a sodium alginate (SA) feed solution. The filtration process is designed in a pressure driven cross-flow module using a single piece hollow fiber membrane in a flow of outside-inside We investigate the effect of Ca and Mg ions in SA solution on the relative permeability, membrane resistance, cake resistance, and cake formation on the membrane surface. Furthermore, the performance of membrane filtration is predicted while using mathematical models that were developed based on Darcy’s law. Results show that the presence of Ca ions in SA solution has the most prominent effect on the formation of a cake layer. The formed cake layer has a significant effect in lowering relative permeability. The developed models have a good fit with the experimental data for pure water filtration with R2 values between 0.9200 and 0.9999. When treating SA solutions, the developed models fit well with experimental with the best model (Model I) shows R2 of 0.9998, 0.9999, and 0.9994 for SA, SA + Ca, and SA + Mg feeds, respectively.

314 Establishment of hollow fiber membrane filtration system for drinking water production (II)

2005 ◽  
Vol 2005.15 (0) ◽  
pp. 262-265
Author(s):  
Toshifumi KURAHASHI ◽  
Toshitsugu KASHIIDE ◽  
Tsuyoshi HIGASHIJIMA ◽  
Keizo MURATA ◽  
Yuji YAMADA ◽  
...  
Keyword(s):  
Drinking Water ◽  
Hollow Fiber ◽  
Membrane Filtration ◽  
Hollow Fiber Membrane ◽  
Water Production ◽  
Fiber Membrane ◽  
Filtration System ◽  
Drinking Water Production

Numerical and experimental investigation to determine the optimal configuration of an aeration component in the hollow fiber membrane cleaning process

RSC Advances ◽  
2016 ◽  
Vol 6 (26) ◽  
pp. 21600-21611 ◽  
Author(s):  
Yufei Wang ◽  
Jie Wang ◽  
Hongwei Zhang ◽  
Yi Wu ◽  
Anhu Dang
Keyword(s):  
Experimental Investigation ◽  
Hollow Fiber ◽  
Membrane Filtration ◽  
Experimental Validation ◽  
Cfd Simulation ◽  
Hollow Fiber Membrane ◽  
Optimal Configuration ◽  
Cleaning Process ◽  
Fiber Membrane ◽  
Membrane Cleaning

The optimal aeration hole design index γ was established by CFD simulation and experimental validation for membrane filtration and cleaning.

Fouling in hollow fiber membrane microfilters used for household water treatment

2015 ◽  
Vol 5 (2) ◽  
pp. 220-228 ◽  
Author(s):  
Anna Murray ◽  
Mario Goeb ◽  
Barbara Stewart ◽  
Catherine Hopper ◽  
Jamin Peck ◽  
...  
Keyword(s):  
Water Treatment ◽  
Hollow Fiber ◽  
Membrane Fouling ◽  
Membrane Filtration ◽  
Hollow Fiber Membrane ◽  
Sterile Water ◽  
Fiber Membrane ◽  
Chemical Cleaning ◽  
Household Water Treatment ◽  
Household Water

The Sawyer PointOne hollow fiber membrane microfilter is promoted for household water treatment in developing countries. Critical limitations of membrane filtration are reversible and irreversible membrane fouling, managed by backwashing and chemical cleaning, respectively. The PointOne advertised lifespan is 10 years; users are instructed to backwash as maintenance. Owing to reduced turbidity and bacterial removal efficiencies, six PointOnes were removed from Honduran homes after 23 months of use. In the laboratory, we tested sterile water filtrate for turbidity and bacterial presence before and after backwashing and chemical cleaning. Sterile water filtrate from uncleaned filters had turbidity of 144–200 NTU and bacteria counts of 13–200 CFU. Cleaned filter effluent was positive for total coliforms. On one new and one used, cleaned filter, we imaged membranes with scanning electron microscopy and characterized surface elemental compositions with spectroscopy. Images and spectroscopy of the used, cleaned membrane revealed a dense, cake fouling layer consisting of inorganic metal oxides, organic material, and biofouling. Burst fibers were visually observed. This PointOne was thus irreversibly fouled and non-functional after <2 years of use. Further research is recommended to determine: impacts of source water quality on PointOne performance, a cleaning regimen to manage fouling, and an appropriate filter lifespan.

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