Joseph Install (Author), Anže Zupanc (Author), Seonyeong Kim (Author), Wenjia Wang (Author), Marianna Kemell (Author), George W. Huber (Author), Timo Repo (Author)

Abstract

The global food industry, inclusive of dairy, is searching for sustainable upgrading of the large volumes of inedible waste they produce. Presented here is the selective oxidation of Greek yoghurt acid-whey derived glucose–galactose syrup (GGS) to gluconic and galactonic acids. Aldonic acids are high value biproducts with many applications. Our straightforward approach combines efficient catalytic oxidation and simple separation to upgrade a large dairy waste product to higher value products under base free conditions, using an Au/Al$_2$O$_3$ catalyst with 73% and 55% selectivity towards gluconic and galactonic acids, respectively, under conditions of 2.5 bar O$_2$ for 24 h at 80 °C with a low Au : GGS ratio of 1 : 1000. A selective separation method was developed allowing the separation of the two epimeric acids based solely on their solubilities with high purity.

Keywords

trajnostni razvoj;valorizacija odpadkov;zelena kemija;oksidacija;sladkorji;glukoza;galaktoza;glukonska kislina;galaktonska kislina;sustainability;waste valorization;green chemistry;oxidation;sugars;glucose;galactose;gluconic acid;galactonic acid;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UL FKKT - Faculty of Chemistry and Chemical Technology
UDC: 547.455.62:542.943
COBISS: 238505219 Link will open in a new window
ISSN: 1463-9270
Views: 63
Downloads: 12
Average score: 0 (0 votes)
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Other data

Secondary language: Slovenian
Secondary keywords: trajnostni razvoj;valorizacija odpadkov;zelena kemija;oksidacija;sladkorji;glukoza;galaktoza;glukonska kislina;galaktonska kislina;
Type (COBISS): Article
Pages: str. 6725-6733
Volume: ǂVol. ǂ27
Issue: ǂiss. ǂ23
Chronology: 21 Jun. 2025
DOI: 10.1039/D5GC01381J
ID: 27174977