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Clarification of red raspberry juice using microfiltration with gas backwashing: A viable strategy to maximize permeate flux and minimize a loss of anthocyanins

Paper ID Volume ID Publish Year Pages File Format Full-Text
19114 43045 2013 8 PDF Available
Title
Clarification of red raspberry juice using microfiltration with gas backwashing: A viable strategy to maximize permeate flux and minimize a loss of anthocyanins
Abstract

•Juice clarified by UF had a superior clarity but the recovery of anthocyanins was low.•A maximum recovery of pigments in a fresh and reconstituted juice was achieved by MF.•Treatment with gelatin and bentonite resulted in more turbid juice than UF and MF.•The permeate flux in MF was maintained at high levels by periodic gas backwashing.•Cake compaction at high pressures was prevented by short filtration cycles.

Red raspberry (Rubus idaeus) juice was produced by maceration of raspberry pulp at 50 °C for 2 h using 400 mg kg−1 Klerzyme®150 enzymatic pectolitic preparation followed by raw juice clarification with gelatin and bentonite or cross-flow membrane filtration. A minimal loss of anthocyanins from 630 to 540 mg l−1 was obtained when the juice was clarified using a ceramic multichannel microfilter (MF) with a pore size of 0.2 μm. A light transmission at 625 nm in MF permeate was above 85% and the residual pectin (900 mg l−1) was completely removed. During ultrafiltration through ceramic or polysulfone membranes with a molecular weight cut-off of 30–300 kDa, the content of anthocyanins was reduced to 220–370 mg l−1, but a light transmission at 625 nm was as high as 96%. The permeate flux in MF was maintained at high values above 170 l m−2 h−1 at 3 bar for more than 2 h by backwashing the membrane with a compressed air every 6 min for 1 min. The cake compression at high pressures was avoided by short filtration times between backwashing.

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Keywords
Microfiltration; Ultrafiltration; Red raspberry juice; Clarification; Anthocyanin
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Clarification of red raspberry juice using microfiltration with gas backwashing: A viable strategy to maximize permeate flux and minimize a loss of anthocyanins
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Publisher
Database: Elsevier - ScienceDirect
Journal: Food and Bioproducts Processing - Volume 91, Issue 4, October 2013, Pages 473–480
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