Extraction of polyphenolics from apple juice by foam fractionation

Saleh, Zaid, Stanley, Roger and Nigam, Mayank (2006) Extraction of polyphenolics from apple juice by foam fractionation. International Journal of Food Engineering, 2 2: . doi:10.2202/1556-3758.1096

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Author Saleh, Zaid
Stanley, Roger
Nigam, Mayank
Title Extraction of polyphenolics from apple juice by foam fractionation
Journal name International Journal of Food Engineering   Check publisher's open access policy
ISSN 1556-3758
Publication date 2006-06-01
Sub-type Article (original research)
DOI 10.2202/1556-3758.1096
Open Access Status File (Publisher version)
Volume 2
Issue 2
Total pages 16
Place of publication Berlin, Germany
Publisher Walter de Gruyter
Language eng
Abstract This research was undertaken to test the feasibility of using the foam technology to separate polyphenols from fruit juices for use as functional food ingredients. The separation performance, expressed as enrichment ratio, selectivity and percentage recovery, was determined as a function of operating variables, namely air or N2 flow rate, initial feed concentration, bubble size, solution pH and the presence of alcohol to modify the surface tension. Measurements were made of the average bubble size and gas hold-up volume to calculate interfacial area. The bulk phase concentrations of the polyphenolics in the feed and foam fractions were analysed for total phenolic content by Folin assay and phenolic composition by reverse phase HPLC. Enrichment factors of up to 6 were found under optimum conditions of low sugar concentration (6-9 oBrix), low flow rate (0.2-0.6 ml min-1) and acidic pH (3-4). However recoveries were low at around 30% of total phenolics and selectivity was poor. It was concluded that foam fractionation represents a potential low cost technology to recover a proportion of the polyphenolic content in an enriched juice concentrate suitable for use as a functional ingredient.
Keyword Foam Fractionation
Apple Juice
Bubble Size
Superficial Velocity
Interfacial Area
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
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Created: Tue, 08 Mar 2011, 01:27:54 EST