Ultrafast hydrolysis of inulin in supercritical water: Fructooligosaccharides reaction pathway and Jerusalem artichoke valorization

• Published in: Industrial crops and products 2019-07, Vol.133, p.72-78
• Main Authors: Martínez, Celia M., Adamovic, Tijana, Cantero, Danilo A., Cocero, M.J.
• Format: Article
• Language: English
• Subjects: Biomass; Biorefinery; Fructose; Pilot plant scale; Pyruvaldehyde
• ISSN: 0926-6690; 1872-633X
• DOI: 10.1016/j.indcrop.2019.03.016

[Display omitted] •Inulin and Jerusalem artichoke are hydrolyzed to fructose and pyruvaldehyde by SCW.•Conversion of fructose to glyceraldehyde is slower than pyruvaldehyde production.•Hydrolysis of Jerusalem artichoke is similar to that of 30% FOS.•FASTSUGARS allows the production of highly valuable compounds in a selective way. In a biorefinery approach, inulin and inulin-rich biomass as Jerusalem artichoke (JA) could be transformed into platform chemicals such as fructose and/or pyruvaldehyde. To do so, the FASTSUGARS pilot plant proved to be a promising alternative for the selective conversion of biomass. In this work, inulin and JA were hydrolyzed in supercritical water (SCW) for the first time. Commercial inulin was selected as a model for fructooligosaccharides (FOS) and its reaction pathway in SCW was elucidated. It was found that fructose was the primary product from FOS hydrolysis in SCW, which was then selectively transformed into pyruvaldehyde as reaction time increased. Operating with extremely low reaction times (0.12 s) the sugars selectivity of JA was as high as 76% w/w. In both cases, the production of degradation products such as 5-HMF and acids was very low. Finally, comparing JA results to those from lignocellulosic biomass it was found that higher conversion was achieved in the case of JA due to its inulin-based composition.