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The isomerization kinetics of lactose to lactulose in the presence of sodium hydroxide at constant and variable pH

Paper ID Volume ID Publish Year Pages File Format Full-Text
19533 43073 2010 7 PDF Available
Title
The isomerization kinetics of lactose to lactulose in the presence of sodium hydroxide at constant and variable pH
Abstract

Lactulose (4-O-β-d-galactopyranosyl-d-fructose) is a synthetic disaccharide. Unique characteristics of lactulose have resulted in its wide use in pharmaceutical and food industries. It is produced by isomerization of lactose in an alkaline medium. The purpose of this work is to investigate the kinetics of lactose to lactulose isomerization in the presence of sodium hydroxide in constant and variable pH condition. The experiments were carried out at three temperatures (50, 60 and 70 °C) and three pH values (10, 10.5 and 11). The effect of different parameters such as temperature, pH and time on the reaction rate, conversion, sugar concentration and maximum conversion of lactose to lactulose were investigated. The experimental results were then used to calculate the rate constants and activation energies. The effects of temperature and pH on rate constants were also investigated. Finally the experimental data were compared to kinetic model predictions.

Keywords
Lactulose; Kinetics; Isomerization; Lactose
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The isomerization kinetics of lactose to lactulose in the presence of sodium hydroxide at constant and variable pH
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Publisher
Database: Elsevier - ScienceDirect
Journal: Food and Bioproducts Processing - Volume 88, Issues 2–3, June–September 2010, Pages 181–187
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