The effect of milling on ozonolysis of cellulose
Date Issued
2005
Date
2005
Author(s)
Hsu, Jui-Ting
DOI
zh-TW
Abstract
Cellulose is the most abundant carbohydrate on the earth, and it is potential application in food and biomaterial field. The water soluble cellulose and oligomers are the hydrolyzed from cellulose, via biological and chemical methods, have been reported to be beneficial to human body. Milling cellulose reduced the particle size and thus increased the surface area, which would enhance chemical reactions. This was to investigate the effect of mechanical milling on ozonolysis of cellulose. Insoluble fractions and volume mean diameter were used as indexes for the change of cellulose. The pH value was employed as an index for the formation of acidic compound. The purpose of this study was to search a process combing milling and ozonlysis for producing cello-oligomers.
After being milled for 0, 20, 60 and 100 min, volume mean diameter of cellulose were 27.08, 10.58, 5.558 and 3.562 μm, respectively. The particle size was further reduced by ozonolysis. Generally, milling resulted in the formation of glucose and cello-oligomers. However, 100min-milling yield cello-oligomers less than 60 min-milling. In addition to reduce the particle size, ozonolysis induced the formation of cello-oligomers. In this study, the 60 min-milling with low dosage of ozone yielded the most oligomers. Both milling and ozone dosage affected the change in pH value. High dosage of ozone resulted in more pH dropped. Probably due to the further oxidation of acidic compounds, CO2 was fund in the eluting gas. During the ozonolysis, the particles smaller than 1μm was increased, the results indicated that it was feasible to prepare cellulose nanoparticle by milling and ozonolysis.
Subjects
研磨
纖維素
臭氧
降解
mill
cellulose
ozone
degradation
Type
thesis
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