Effect of ultrasonic time on the structural and physico-chemical properties of hemicelluloses from Eucalyptus grandis. (1st September 2018)

• Record Type: Journal Article
• Authors: Xu, Ji-Yuan; Yuan, Tong-Qi; Xiao, Lin; Sun, Run-Cang
• Is Part Of: Carbohydrate polymers. Volume 195(2018)
• Page Start: 114
• Page End: 119
• Publication Date: 2018-09-01
• Subjects: Xylose (PubChem CID: 135191) -- Rhamnose (PubChem CID: 25310) -- Arabinose (PubChem CID: 439195) -- Galactose (PubChem CID: 6036) -- Glucose (PubChem CID: 5793); Eucalyptus grandis -- Yield -- Ultrasound-assisted extraction -- Structural properties; Polysaccharides -- Periodicals; Polysaccharides -- Periodicals; Polysaccharides -- Périodiques; Electronic journals; 547.78
• DOI: 10.1016/j.carbpol.2018.04.067
• Languages: English
• ISSNs: 0144-8617

Abstract

Highlights: Sonication had a significant effect on the alkaline extraction of hemicelluloses. Xylans from hardwood obtained with or without ultrasound had similar structure. Ultrasonication has potential in separating hemicelluloses at an industrial level. Abstract: Effect of sonication on the extractability and physico-chemical properties of hemicelluloses from Eucalyptus grandis using 5% KOH solution at 50 °C for 3 h has been comparatively studied. The results showed that the yield of hemicelluloses increased from 2.6 to 19.6% as the ultrasonic time was extended from 5 to 35 min. The highest yield of hemicelluloses (95.2%) was achieved at 30 min ultrasonic time. Xylose was the dominant sugar (82.94–84.96%) of all the hemicellulosic fractions. Furthermore, the hemicelluloses obtained by ultrasound-assisted extractions had slightly lower molecular weights (74, 510–66, 770 g/mol) and thermal stabilities, but higher contents of xylose (83.95–84.96%). The increased yield of ultrasonically extracted hemicelluloses, which have preserved their main structural properties, confirmed the great potential of ultrasound-assisted extraction to separate hemicelluloses from Eucalyptus grandis at an industrial level.