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Updated: May 20, 2025

Development of Heterogeneous Enantioselective Catalysts using Chiral Metal-Organic Frameworks MOFs
Published on: January 17, 2020
Structural localisation of catalytic H2O2 oxidation sites in starch
Onno J O P Broekman1, Ciaran W Lahive1, Warner Piersma1
1Green Chemical Reaction Engineering, Engineering and Technology institute Groningen, University of Groningen, Nijenborgh 4, 9747 AG Groningen, the Netherlands.
Abstract:
The catalytic oxidation of potato starch by [MnIV2(μ-O)3(tmtacn)2][H2O](CH3COO)2 (Mncat, with tmtacn = 1,4,7-trimethyl-1,4,7-triazacyclononane) with H2O2, was recently introduced as a promising alternative to ubiquitous sodium hypochlorite (NaOCl). Here, we report an in-depth investigation into interactions of the catalyst with the starch granule. Pitted starches obtained by pre-treatment with high-frequency ultrasound (HFUS) were shown to result in a uniquely homogeneous oxidation. To study this further, fractionation of oxidised potato starch was done which showed a preference for the oxidation of smaller granules with a higher relative surface area. This result was corroborated by chemical surface gelatinisation of fractionated granules. These studies showed that the inside of the granules was oxidised, but that Mncat had a moderate preference for oxidation of the periphery. Together, these results allow for a better understanding of oxidation of starch by Mncat and how it differs from NaOCl oxidation making further optimisation of the process possible.
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