High Yield of L‐Sorbose via D‐Glucose Isomerization in Ethanol over a Bifunctional Titanium‐Boron‐Beta Zeolite

Chemistry - A European Journal, Journal Year: 2024, Volume and Issue: 30(64)

Published: Sept. 16, 2024

Abstract D‐Glucose‐to‐L‐sorbose isomerization on Lewis acidic zeolite is a highly attractive avenue for sorbose production. But the L‐sorbose yield limited by competing D‐glucose‐to‐D‐fructose and reaction equilibrium. In this work, it suggested that ethanol directs glucose conformation selective D‐glucose‐to‐L‐sorbose isomerization. It also reacts with produced to form ethyl‐sorboside, which allows proceed beyond thermodynamic equilibrium limit. shown bifunctional Beta containing framework titanium (Ti) boron (B) catalyst tandem reaction: Ti catalyzes via an intramolecular 5,1‐hydride shift process as confirmed isotopic tracing experiments followed 13 C‐NMR, while weak Brønsted acid B selectively promotes ketalization ethanol. A remarkably high of fraction sugar (>95 %: 27 % unreacted glucose, 11.4 fructose, 57 sorbose) was obtained after mixture in hydrolyzed.

Language: Английский

Extraction techniques for the determination of carotenoids and vitamins in food

Elsevier eBooks, Journal Year: 2024, Volume and Issue: unknown

Published: Jan. 1, 2024

Language: Английский