Preparation of porous microcrystalline cellulose and its properties
Date Issued
2011
Date
2011
Author(s)
Lin, Mei-Yin
Abstract
According to the study daily sodium intake has a positive correlation with risk of hypertension and cardiovascular disease. In 2010, American Heart Association suggested the food producer to reduce 10-40% sodium content of their products. Obviously, development of salt reduction products is a current trend. This study was divided into two parts. In the first part, the preparation of porous cellulosic materials was employed by enzymatic hydrolysis. In the other part, combination of porous cellulosic material and chitosan was tested to create a complex material to be a carrier of sodium chloride for the purpose of prolongation of sodium chloride dissolution. The longer the salty taste is maintained, the less intake of salt is approached. The result denoted that the porous cellulosic material was successfully prepared by enzymatic hydrolysis for 4 hours and E/S 0.025. Their specific surface area, pore volume and water holding capacity, in comparison to the raw cellulose, were improved to be 2.6, 3.4 and 1.4 times, respectively. The maximum binding capacity of raw cellulose to chitosan was 4.88 (mg chitosan/g cellulose) in the mixture (1:1 V/V) of cello-dispersion and 0.3% chitosan solution with 6 hours and 160 rpm agitation. Cellulose hydrolyzed 3, 4 and 5 hours can be respective promoted their binding ability to chitosan to 5.5, 6.1 and 6.0 (mg chitosan/g cellulose). The binding of chitosan onto porous cellulosic material varied the zeta potential of the cellulose from -16 mV to 31.43 mV, which changed the charge property of cellulose interfaces. The steady state duration of the NaCl dissolution could be postponed to 1.4 and 8.1 times for the samples of RC_Chi (raw cellulose-chitosan complex) and HC_Chi (hydrolysis cellulose-chitosan complex) for the 3% NaCl test, as compared to the raw cellulose, and they were 1.3 and 6.5 times for the 31.28% NaCl test. It proved that the porous cellulose/chitosan complex significantly retarded the desorption of NaCl than did the un-hydrolyzed one.
Subjects
enzyme
porous cellulose
chitosan
sodium chloride
carrier
salt reduction product
SDGs
Type
thesis
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