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Clarification of Stevia extract by ultrafiltration: Selection criteria of the membrane and effects of operating conditions

Paper ID Volume ID Publish Year Pages File Format Full-Text
19068 43043 2012 8 PDF Available
Title
Clarification of Stevia extract by ultrafiltration: Selection criteria of the membrane and effects of operating conditions
Abstract

Clarification of pre-treated Stevia extract using ultrafiltration is presented in this study. Performance of four different ultrafiltration membranes, namely 5, 10, 30 and 100 kDa were investigated in terms of permeate flux and permeate quality, mainly the recovery of Stevioside in the permeate. In this regard, the 30 kDa membrane was found to be most suitable. A systematic set of experiments under steady state were conducted to analyze the effects of the operating conditions, transmembrane pressure drop and stirrer speed on the permeate flux and permeate quality. Steady state was reached in between 8 and 16 min depending on the operating conditions. Steady state was reached earlier at higher stirring speed. A simple resistance in series model was used to quantify the fouling resistance. Membrane resistance was found to be negligible compared to the fouling resistance. It was a strong function of the stirrer speed but remained almost invariant with transmembrane pressure drop. The steady state permeate flux increased with pressure drop as well as the stirrer speed. 45% average recovery of Stevioside was obtained during stirred steady state experiments at lower operating pressures (276 and 414 kPa). At higher operating pressures, recovery of Stevioside in the permeate decreased remarkably.

► Criteria for selection of membranes for clarification of Stevia extract. ► 30 kDa membrane was found to be most suitable. ► Lower pressure allows recovery of more Stevioside. ► Higher stirring speed results more flux. ► About 45% recovery of Stevioside was obtained.

Keywords
Stevioside; Clarification; Ultrafiltration; Permeate flux; Resistance; Recovery
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Publisher
Database: Elsevier - ScienceDirect
Journal: Food and Bioproducts Processing - Volume 90, Issue 3, July 2012, Pages 525–532
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us