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Basic solvent for dissolving chitosan and method for dissolving chitosan under alkaline condition
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An alkaline condition, chitosan technology, applied in the field of alkaline solvent for dissolving chitosan and dissolving chitosan under alkaline conditions, can solve the problems of long dissolution time, long time consumption, unfavorable industrial production and the like , to achieve the effect of pollution-free environment and easy operation
Inactive Publication Date: 2013-11-06
ANHUI UNIV OF SCI & TECH
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Problems solved by technology
[0003] At present, the solvents for dissolving chitosan at home and abroad are basically various dilute acids, and chitosan is extremely unstable in acidic solvents, which will cause partial hydrolysis of the long chain of chitosan and cleavage of glycosidic bonds, resulting in a decrease in the molecular weight of chitosan. Reduced and polydispersed, resulting in reduced performance of chitosan products
In recent years, some new solvents have also appeared to dissolve chitosan. For example, CN 102168323A publicly reported that ionic liquids are used as solvents to dissolve chitosan. There are imidazole ionic liquids, pyridine ionic liquids, and morpholine ionic liquids. The selection range of polysaccharide solvents, and the performance of the prepared chitosan products are stable, but the dissolution time is long, and the price of ionic liquids is relatively expensive, which is not conducive to industrial production
In addition, patent 200810059135.X publicly reported a kind of alkaline solvent (NaOH 0.2~2%, KOH 0.1%~5% mixed aqueous solution) for dissolving chitosan (deacetylation degree is at 40%~70%), but using this Method When dissolving chitosan, first disperse chitosan in alkaline solution, let it fully swell, and then freeze and thaw several times repeatedly, so this method takes a long time and cannot quickly dissolve chitosan
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Embodiment 1
[0016] 1. Alkaline solvent composition: 7.5% sodium hydroxide, 11% urea, 3% absorbent cotton, and the balance is water.
[0017] 2. Dissolving method: mix 7.5g sodium hydroxide, 11g urea and 78.5g water, stir evenly to obtain a transparent solution, then freeze at -20°C for 4-6 hours, take it out, add 3g cellulose, stir quickly, and prepare a base neutral solvent; disperse the chitosan in the alkaline solvent, stir rapidly, and the chitosan dissolves quickly to obtain a transparent chitosan solution. In the prepared chitosan solution, the content of chitosan is 2wt%.
Embodiment 2
[0019] 1. Composition of alkaline solvent: 5% sodium hydroxide, 13% urea, 2% absorbent cotton and the balance is water.
[0020] 2. Dissolving method: Mix 5g sodium hydroxide, 13g urea and 80g water, stir well to obtain a transparent solution, then freeze at -20°C for 4-6 hours, take it out and add 2g cellulose, stir quickly to prepare an alkaline solvent; Disperse the chitosan in the alkaline solvent, stir rapidly, the chitosan dissolves quickly, and obtain a transparent chitosan solution. In the prepared chitosan solution, the content of chitosan is 0.5%.
Embodiment 3
[0022] 1. Composition of alkaline solvent: 8% sodium hydroxide, 12% urea, 2.5% absorbent cotton, and the balance is water.
[0023] 2. Dissolving method: mix sodium hydroxide, urea, water and cellulose according to the ratio, freeze at -20°C for 4-6 hours, then heat up to 0°C and stir to obtain a transparent solution, add chitosan, stir quickly to dissolve A transparent chitosan solution was obtained. The chitosan content in the prepared chitosan solution was 1%.
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Abstract
The invention discloses a basic solvent for dissolving chitosan and a method for dissolving chitosan under an alkaline condition. The basic solvent for dissolving chitosan comprises the following components in percentage by mass: 5% to 10% of sodium hydroxide, 8% to 13% of urea, 0.5% to 6% of celluloses and the balance of water. The content of chitosan in chitosan solution prepared through the method for dissolving chitosan is 0.5% to 4%, and the deacetylation degree of chitosan is 80% to 95%. The basic solvent adopts a physical way to dissolve chitosan, the solubility of chitosan and cellulose can reach 100%, and the transparent chitosan solution can be prepared.
Description
1. Technical field [0001] The invention relates to a solvent for dissolving chitosan and a method for dissolving chitosan, in particular to an alkaline solvent for dissolving chitosan and a method for dissolving chitosan under alkaline conditions. 2. Background technology [0002] Since the Frenchman Rouget first obtained chitosan in 1859, this natural polymer has been used by all walks of life because of its good adsorption, film-forming and permeability, fibrillation, hygroscopicity and moisture retention. It has been widely concerned by the industry, and has made significant progress in applied research in many fields such as medicine, food, chemical industry, cosmetics, water treatment, metal extraction and recovery, biochemical and biomedical engineering. Chitosan is the product of N-deacetylation of chitin, and the content of chitin in nature is second only to cellulose, and it is an abundant renewable resource. Therefore, for the current shortage of petroleum, it is n...
Claims
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Application Information
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