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Investigation Into the Crossflow Microfiltration Process Utilizing Ceramic Membrane Applied to Bacteria Reduction and Clarifying of Açai Juice

[+] Author Affiliations
Renata Natsumi Haneda, Sérgio Rodriques Fontes

University of São Paulo, São Carlos, SP, Brazil

Paper No. IMECE2008-66121, pp. 199-206; 8 pages
  • ASME 2008 International Mechanical Engineering Congress and Exposition
  • Volume 2: Biomedical and Biotechnology Engineering
  • Boston, Massachusetts, USA, October 31–November 6, 2008
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-4863-0 | eISBN: 978-0-7918-3840-2
  • Copyright © 2008 by ASME


This paper reports the results of the crossflow microfiltration process applied to the reduction of bacteria and retention of particles in suspension of açai (Euterpe oleracea Mart.) juice. A commercial membrane of α-alumina (Al2 O3 ) in the form of a tube with 1.2μm of average pore size was utilized to investigate the reduction of the bacteria of açai juice without using high temperatures (pasteurization). This pore size of the ceramic structure was utilized in an attempt to reduce the polarization phenomenon and improve the permeate flux without utilizing the usual enzymatic treatment made in the microfiltration processes that utilize polymeric membrane (Cianci et al., 2005 and Ushikubo et al., 2006). An anthocyanin concentration was also observed during the microfiltration process followed by suspended particles retention as an indicator of açai juice clarifying. The Scanning Electronic Microscopy (SEM) was utilized as an essential tool to characterize the morphology of the ceramic micro porous structure and to evaluate the formation of a polarization layer on the membrane surface, while the Optical Microscopy was used to analyze the difference in the characteristics between samples of concentrate and permeate.

Copyright © 2008 by ASME



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