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Selective production of lactobionic acid by aerobic oxidation of lactose over gold crystallites supported on mesoporous silica

Paper ID Volume ID Publish Year Pages File Format Full-Text
41244 45882 2011 10 PDF Available
Title
Selective production of lactobionic acid by aerobic oxidation of lactose over gold crystallites supported on mesoporous silica
Abstract

Partial oxidation of lactose over Au-based catalyst system using nanostructured silica materials with improved activity, selectivity and stability was investigated as a novel chemo-catalytic approach for selective synthesis of lactobionic acid (LBA) for therapeutic, pharmaceutical and food grad applications.Highly active gold crystallites dispersed on mesoporous silica (SiO2-meso) using bis-[3-(triethoxysilyl) propyl] tetrasulfide (BTSPT), a silane coupling agent to immobilize gold, were successfully formulated, and their catalytic activity was evaluated in an agitated semi-batch reactor. The catalysts were characterized by N2 physisorption, XRD, XPS and TEM. The influence of the reaction conditions, i.e., temperature, pH value, metal loading and catalyst/lactose ratio on lactose conversion were investigated. After 100 min of reaction, the catalyst containing 0.7% Au showed the highest catalytic activity (100% lactose conversion) and a 100% selectivity towards LBA, when it was used at a catalyst/lactose ratio of 0.2 under alkaline (pH 9.0) and mild reaction temperature (65 °C).

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (138 K)Download as PowerPoint slideHighlights► Highly active gold crystallites successfully dispersed on mesoporous silica (SiO2-meso). ► SiO2-meso presents a wormhole-like framework with interconnected 3D-mesopores. ► 0.7% Au/SiO2-meso is very active for lactose partial oxidation to lactobionic acid (LBA). ► 0.7% Au/SiO2-meso is 100% selective towards LBA production.

Keywords
Lactobionic acid; Lactose; Oxidation; Gold clusters; Mesoporous silica
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Selective production of lactobionic acid by aerobic oxidation of lactose over gold crystallites supported on mesoporous silica
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 402, Issues 1–2, 31 July 2011, Pages 94–103
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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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
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Any Questions? feel free to contact us