6533b82cfe1ef96bd128ffcf

RESEARCH PRODUCT

Solid acid-catalyzed depolymerization of barley straw driven by ball milling

Mari JaakkolaUlla LassiUlla LassiLaura SchneiderLaura SchneiderJasmiina Haverinen

subject

Environmental Engineering020209 energyOxalic acidCarbohydratesBioengineering02 engineering and technology01 natural sciencesCatalysisPolymerizationCatalysischemistry.chemical_compoundHydrolysisSpectroscopy Fourier Transform Infrared0202 electrical engineering electronic engineering information engineeringOrganic chemistryWaste Management and DisposalBall millWaste Productschemistry.chemical_classification010405 organic chemistryRenewable Energy Sustainability and the EnvironmentDepolymerizationHydrolysisOxalic AcidTemperaturefood and beveragesHordeumGeneral MedicineStraw0104 chemical sciencesReducing sugarKineticsAcid strengthchemistryBiotechnologyNuclear chemistry

description

This study describes a time and energy saving, solvent-free procedure for the conversion of lignocellulosic barley straw into reducing sugars by mechanocatalytical pretreatment. The catalytic conversion efficiency of several solid acids was tested which revealed oxalic acid dihydrate as a potential catalyst with high conversion rate. Samples were mechanically treated by ball milling and subsequently hydrolyzed at different temperatures. The parameters of the mechanical treatment were optimized in order to obtain sufficient amount of total reducing sugar (TRS) which was determined following the DNS assay. Additionally, capillary electrophoresis (CE) and Fourier transform infrared spectrometry (FT-IR) were carried out. Under optimal conditions TRS 42% was released using oxalic acid dihydrate as a catalyst. This study revealed that the acid strength plays an important role in the depolymerization of barley straw and in addition, showed, that the oxalic acid-catalyzed reaction generates low level of the degradation product 5-hydroxymethylfurfural (HMF).

yearjournalcountryeditionlanguage
2015-12-08Bioresource Technology
https://doi.org/10.1016/j.biortech.2016.01.095