Research

Measurement of polyphenol-membrane interaction forces during the ultrafiltration of black tea liquor


Reference:

Evans, P. J., Bird, M. R., Rogers, D. and Wright, C. J., 2009. Measurement of polyphenol-membrane interaction forces during the ultrafiltration of black tea liquor. Colloids and Surfaces, A: Physicochemical and Engineering Aspects, 335 (1-3), pp. 148-153.

Related documents:

This repository does not currently have the full-text of this item.
You may be able to access a copy if URLs are provided below. (Contact Author)

Official URL:

http://dx.doi.org/10.1016/j.colsurfa.2008.11.023

Abstract

This paper reports the use of atomic force microscopy (AFM) surface interaction measurements for a model polyphenol present in tea (theaflavin-3-gallate) with a regenerated cellulose ultrafiltration membrane. Differently treated membranes from throughout the fouling cleaning cycle were investigated. The adhesion of the foulant to the virgin and the fouled once/cleaned once (F1C1) membrane surface was stronger than that recorded for foulant-foulant interactions (1.87 and 1.72 N m(-2), respectively, matching curves ranging between 0 and 5.5 N m(-2) with a single shallow peak). Interestingly. NaOH cleaning of the virgin conditioned membrane reduced foulant-membrane adhesion compared to the virgin or F1C1 surface (0.96 N m(-2)) with a narrow spread of the adhesion (80% of measurements being within the range 0.5-0.99 N m(-2)). The uniform narrow distribution of attraction (approach) forces to the fouled and cleaned surfaces helps explain this due to uniformly charged foulant/hydroxyl ions adhering to these membrane surfaces, whereas the virgin membrane distribution was very wide demonstrating no charge modification of this surface. The present study has demonstrated how the AFM coated colloid probe technique can be used with multiple (200x) measurements across a surface to further aid understanding of the nature of fouling and cleaning mechanisms, particularly in protein/polyphenol systems.

Details

Item Type Articles
CreatorsEvans, P. J., Bird, M. R., Rogers, D. and Wright, C. J.
DOI10.1016/j.colsurfa.2008.11.023
Uncontrolled Keywordsfouling, ultrafiltration, black tea, atomic force microscopy, cleaning
DepartmentsFaculty of Engineering & Design > Chemical Engineering
RefereedYes
StatusPublished
ID Code13511

Export

Actions (login required)

View Item