TY - JOUR
T1 - Benign catalytic oxidation of potato starch using a homogeneous binuclear manganese catalyst and hydrogen peroxide
AU - Broekman, J. O.P.
AU - Genuino, Homer C.
AU - Heeres, Hero J.
AU - Brinksma, Jelle
AU - Wielema, Thomas
AU - Deuss, Peter J.
N1 - Funding Information:
This chlorine-free starch oxidation work is part of a collaborative project between the University of Groningen and Avebe. Financial support from Samenwerkingsverband Noord-Nederland (SNN), as part of the project Transitie II, Pieken in de delta, project T3003 Duurzaam & kostenefficiënt productieproces zetmeel, is gratefully acknowledged. P. J. D. and J. O. P. B. acknowledge funding via the carbobased research program “A greener starch oxidation”. The carbobased research program is co-financed by the “SNN, Ruimtelijk Economisch Programma” and coordinated by the Carbohydrate Competence Center (https://www.cccresearch.nl). The authors furthermore acknowledge the financial support of Avebe for this research program. Lisa Langelaan is acknowledged for analytical measurements (RVA). Tim Meinds is acknowledged for useful initial experimentation. Zhenlei Zhang is acknowledged for fruitful discussions.
Funding Information:
This chlorine-free starch oxidation work is part of a collaborative project between the University of Groningen and Avebe. Financial support from Samenwerkingsverband Noord-Nederland (SNN), as part of the project Transitie II, Pieken in de delta, project T3003 Duurzaam & kostenefficiënt productieproces zetmeel, is gratefully acknowledged. P. J. D. and J. O. P. B. acknowledge funding via the carbobased research program “A greener starch oxidation”. The carbobased research program is co-financed by the “SNN, Ruimtelijk Economisch Programma” and coordinated by the Carbohydrate Competence Center ( https://www.cccresearch.nl ). The authors furthermore acknowledge the financial support of Avebe for this research program. Lisa Langelaan is acknowledged for analytical measurements (RVA). Tim Meinds is acknowledged for useful initial experimentation. Zhenlei Zhang is acknowledged for fruitful discussions.
Publisher Copyright:
© 2023 The Royal Society of Chemistry.
PY - 2023/1/10
Y1 - 2023/1/10
N2 - Oxidation is an excellent way to improve the properties of native starches. After oxidation, products are easier to handle due to a lowered paste viscosity in water, an improved stability and enhanced adhesive properties. Currently, oxidation by sodium hypochlorite (NaOCl) is the dominant commercial process for oxidized starches, which allows for oxidation of hydroxyl groups into carboxylic acids. Here, we show that by using a commercial homogeneous binuclear manganese catalyst ([MnIV2(μ-O)3(tmtacn)2][(CH3COO)2] (Mncat), with tmtacn = 1,4,7-trimethyl-1,4,7-triazacyclononane), and H2O2 as oxidant, starch can be oxidised without the cogeneration of ecotoxic chlorinated waste products. Although oxidation with H2O2 and other catalysts (mainly iron-based) has been done, high loadings were needed and the starch pasting properties were not yet on par with NaOCl oxidised starches. Starch granules suspended in water can be oxidized at room temperature with 0.0021 mol% Mncat and 1 wt% H2O2 yielding starch with similar properties (DSCOOH, yield, pasting properties) as those achieved by NaOCl oxidation. This catalytic oxidation of starch with an earth-abundant metal catalyst at ppm loadings, which is widely applied in detergents, highlights the potential for the development of a more sustainable process to produce oxidized starches.
AB - Oxidation is an excellent way to improve the properties of native starches. After oxidation, products are easier to handle due to a lowered paste viscosity in water, an improved stability and enhanced adhesive properties. Currently, oxidation by sodium hypochlorite (NaOCl) is the dominant commercial process for oxidized starches, which allows for oxidation of hydroxyl groups into carboxylic acids. Here, we show that by using a commercial homogeneous binuclear manganese catalyst ([MnIV2(μ-O)3(tmtacn)2][(CH3COO)2] (Mncat), with tmtacn = 1,4,7-trimethyl-1,4,7-triazacyclononane), and H2O2 as oxidant, starch can be oxidised without the cogeneration of ecotoxic chlorinated waste products. Although oxidation with H2O2 and other catalysts (mainly iron-based) has been done, high loadings were needed and the starch pasting properties were not yet on par with NaOCl oxidised starches. Starch granules suspended in water can be oxidized at room temperature with 0.0021 mol% Mncat and 1 wt% H2O2 yielding starch with similar properties (DSCOOH, yield, pasting properties) as those achieved by NaOCl oxidation. This catalytic oxidation of starch with an earth-abundant metal catalyst at ppm loadings, which is widely applied in detergents, highlights the potential for the development of a more sustainable process to produce oxidized starches.
UR - http://www.scopus.com/inward/record.url?scp=85147154427&partnerID=8YFLogxK
U2 - 10.1039/d2cy01629j
DO - 10.1039/d2cy01629j
M3 - Article
AN - SCOPUS:85147154427
SN - 2044-4753
VL - 13
SP - 1233
EP - 1243
JO - Catalysis Science and Technology
JF - Catalysis Science and Technology
IS - 4
ER -