Separation and concentration of health compounds by membrane filtration

Saleh, Zaid S., Stanley, Roger and Wibisono, Reginald (2006) Separation and concentration of health compounds by membrane filtration. International Journal of Food Engineering, 2 3: 4-1-4-14. doi:10.2202/1556-3758.1125

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Author Saleh, Zaid S.
Stanley, Roger
Wibisono, Reginald
Title Separation and concentration of health compounds by membrane filtration
Journal name International Journal of Food Engineering   Check publisher's open access policy
ISSN 1556-3758
Publication date 2006-09
Sub-type Article (original research)
DOI 10.2202/1556-3758.1125
Open Access Status File (Publisher version)
Volume 2
Issue 3
Start page 4-1
End page 4-14
Total pages 14
Place of publication Berlin, Germany
Publisher Walter de Gruyter
Language eng
Abstract The performance of nano-filtration (NF) for separating phenolic compounds from sugar in apple juice was studied using 1 and 0.25 kDa molecular weight cut-off (MWCO) spiral wound membranes. If these phenolic compounds could be recovered, they could stabilize the juice from haze formation or be added as antioxidants to foods and beverages in order to increase their health properties. Batch experiments were conducted on a pilot scale rig using a diluted clear apple juice concentrate. For the 1 kDa MWCO membrane, the research determined the effect of operating conditions on process efficiency and membrane fouling. The concentration of polyphenolics on the retentate side increased by a factor of up to 4 and the sugar concentration increased by 1.5 times under optimum conditions of lower temperature (30oC), acidic pH (2), lower transmembrane pressure (5 Bar) and higher initial sugar concentration (20 oBrix). Despite the increase in polyphenolics in the retentate, there was little difference in the phenolic composition between retentate and permeate solutions. As the molecular mass of the rejected phenolics was smaller than the membrane cut-off, this indicated that the rejection was related to the formation of a secondary membrane formed as a result of fouling. A mass balance of polyphenolics in the final retentate and permeate compared with the initial feed solution indicated that up to 4.3 gm of polyphenolics were bound per m2 of membrane. The permeate solutions collected from the 1 kDa MWCO membrane were then filtered using a 0.25 kDa MWCO membrane. Most phenolic compounds were retained by the membrane and the concentration increased by a factor of up to 2. Catechin, rutin, phloridzin and quercetin derivatives were concentrated on the retentate side. However, around 20-40% of chlorogenic acid and epicatechin was observed on the permeate side. It is concluded that membrane separation represents a potentially efficient and cost-effective technology to separate the phenolic fraction of fruit juice in a form suitable for use as a functional ingredient.
Keyword Nano-filtration
Apple Juice
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ
Additional Notes Article number 4

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
Queensland Alliance for Agriculture and Food Innovation
ERA 2012 Admin Only
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Created: Mon, 07 Mar 2011, 15:27:49 EST