CN1318567A - High concentration process of preparing water soluble oligomerized chitosan - Google Patents
High concentration process of preparing water soluble oligomerized chitosan Download PDFInfo
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- CN1318567A CN1318567A CN 00114484 CN00114484A CN1318567A CN 1318567 A CN1318567 A CN 1318567A CN 00114484 CN00114484 CN 00114484 CN 00114484 A CN00114484 A CN 00114484A CN 1318567 A CN1318567 A CN 1318567A
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Abstract
Chitosan colloid solution in 20-50 wt% concentration is oxidized and degraded with hydrogen peroxide to produce water soluble oligomerized chitosan. The process has low solvent consumption, short reaction period, simple process and low cost. The water soluble oligomerized chitosan product may be used widely in agriculture, food, cosmetics and pharmaceutical industry.
Description
The present invention relates to a kind of method for preparing low-molecular water-soluble chitosan.
Chitin is that the occurring in nature reserves are only second to cellulosic second largest renewable resource, and chitosan is the product of chitin deacetylase base.The chitosan of different molecular weight has different efficacies, and molecular weight is lower than 10,000 low-molecular water-soluble chitosan, because its unique physiologically active and physico-chemical property are significant to agricultural, medicine and cosmetic industry.
Main at present employing edman degradation Edman prepares low-molecular water-soluble chitosan.The preparation method can be divided into the acid degradation method, enzyme liberating method and oxidation degradation method.Wherein the hydrogen peroxide oxidation edman degradation Edman is not because of reaction product has residual hazard, easily handles, cost is low, is a kind of process for cleanly preparing and noticeable.The flat 1-287102 of day disclosure special permission communique, flat 2-22301, flat 2-11601 all mention with the hydrogen peroxide oxidation degrade chitosan and prepare low-molecular-weight chitosan.Existing technology all is to carry out oxidative degradation under the initial weight percentage concentration is the situation of 0.5-20%, and reaction back solution will concentrate, lyophilize, or with organic solvent such as ethanol sedimentation.Because solvent volume is big, when concentrating consumption energy consumption, the solvent load that precipitation needs is big.
The purpose of this invention is to provide a kind of method for preparing low-molecular water-soluble chitosan, this method should have characteristics such as solvent for use is few, and the reaction times is short, and is easy and simple to handle, with low cost.
Concrete technical scheme of the present invention is: the chitosan of deacetylation 60-100% is dispersed in the aqueous hydrogen peroxide solution of 0.01-2.0%, mixed with this solution and 30% aqueous acetic acid or 35% aqueous hydrochloric acid, concentration expressed in percentage by weight to acetic acid or hydrochloric acid is 0.5-5%, forms the high viscosity colloidal solution of chitosan concentration expressed in percentage by weight＞20-50%.Colloidal solution is in 60-90 ℃ water-bath after insulation reaction 10-30 minute, the aqueous hydrogen peroxide solution of continuation dropping under agitation 27% to the final weight percentage concentration of aqueous hydrogen peroxide solution is 0.5-15%, water-bath 60-90 ℃ insulation reaction 10-60 minute, after direct filtration is removed insolubles, concentrate drying under the vacuum, or use the organic solvent deposit product, obtain low-molecular water-soluble chitosan acetate or hydrochloride.Organic solvent is ethanol, methyl alcohol or acetone.
By technical scheme of the present invention, after removing by filter insolubles, regulate pH value=about 8 with dilute NaOH solution, concentrate drying under vacuum again, or use the organic solvent deposit product, obtain low-molecular water-soluble chitosan.
The present invention be a kind of under high density (＞20-50% concentration expressed in percentage by weight) prepare the method for low-molecular water-soluble chitosan.React under high density, the solvent for use volume is little, and the reaction times is short, and aftertreatment is simple, only needs with a small amount of organic solvent deposit product, is a kind of economic water-soluble chitosan production technique that cleans.
Embodiment 1
30 gram chitosans disperse with 0.045% aqueous hydrogen peroxide solution 75ml, add 30% acetic acid 20ml, and are evenly mixed.Insulation is 30 minutes in 80 ℃ of water-baths, produces a large amount of foams, becomes the low viscosity aqueous solution.Stir down and continue to drip (27%) aqueous hydrogen peroxide solution 25ml, reacted 30 minutes.With NaOH solution regulator solution pH=8, be the faint yellow aqueous solution, remove by filter a small amount of insolubles.Add the long-pending ethanol of tetraploid, chitosan is precipitated out, filter, the precipitated product washing with alcohol, dry under the room temperature.
Embodiment 2
30 gram chitosans disperse with 2% aqueous hydrogen peroxide solution 75ml, add 35% hydrochloric acid 20ml, and are evenly mixed.Insulation is 30 minutes in 80 ℃ of water-baths, produces a large amount of foams, becomes sticky shape liquid.Stir down and continue to drip (27%) aqueous hydrogen peroxide solution 24ml, reacted 60 minutes.Remove by filter a small amount of insolubles, concentrate drying under the vacuum obtains chitosan hydrochloride.
Claims (2)
1. method for preparing low-molecular water-soluble chitosan, it is characterized in that: the chitosan of deacetylation 60-100% is dispersed in the aqueous hydrogen peroxide solution of 0.01-2.0%, mixed with this solution and 30% aqueous acetic acid or 35% aqueous hydrochloric acid, concentration expressed in percentage by weight to acetic acid or hydrochloric acid is 0.5-5%, form the high viscosity colloidal solution of chitosan concentration expressed in percentage by weight＞20-50%, colloidal solution water-bath 60-90 ℃ insulation reaction 10-30 minute, aqueous hydrogen peroxide solution to the aqueous hydrogen peroxide solution final weight percentage concentration that under agitation continues dropping 27% is 0.5-15%, water-bath 60-90 ℃ insulation reaction 10-60 minute, concentrate drying under vacuum, or use organic solvent deposit, obtain product.
2. the method for preparing low-molecular water-soluble chitosan according to claim 1 is characterized in that: after removing by filter insolubles, regulate pH value=8 with dilute NaOH solution, and concentrate drying under vacuum again, or use the organic solvent deposit product, obtain product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN00114484A CN1108311C (en) | 2000-04-17 | 2000-04-17 | High concentration process of preparing water soluble oligomerized chitosan |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN00114484A CN1108311C (en) | 2000-04-17 | 2000-04-17 | High concentration process of preparing water soluble oligomerized chitosan |
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| CN1318567A true CN1318567A (en) | 2001-10-24 |
| CN1108311C CN1108311C (en) | 2003-05-14 |
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| CN00114484A Expired - Fee Related CN1108311C (en) | 2000-04-17 | 2000-04-17 | High concentration process of preparing water soluble oligomerized chitosan |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1313500C (en) * | 2004-06-25 | 2007-05-02 | 中国科学院海洋研究所 | Preparation of chitin oligose compound |
| CN1332984C (en) * | 2004-03-17 | 2007-08-22 | 海南大学 | Method for preparing chitosan/chitose in molecular weight narrow distributed |
| CN100447161C (en) * | 2005-05-16 | 2008-12-31 | 海南大学 | Method of microwave assistant degradation for preparing narrow molecular weight distributed Chitosan poly oligosaccharide |
| CN101168570B (en) * | 2007-11-15 | 2010-05-26 | 暨南大学 | Method for degrading kelp polysaccharide sulfate |
| CN102180993A (en) * | 2011-05-05 | 2011-09-14 | 大连鑫蝶泓祥甲壳素有限公司 | Production method of chitooligosaccharide |
| CN102321194A (en) * | 2011-08-12 | 2012-01-18 | 厦门蓝湾科技有限公司 | Method for preparing water-soluble chitosan with low molecular weight |
| CN102352568A (en) * | 2011-10-26 | 2012-02-15 | 芜湖南翔羽绒有限公司 | Arrangement method for down feathers with antibacterial function |
| CN102432378A (en) * | 2011-09-19 | 2012-05-02 | 北京雷力农用化学有限公司 | Foliar fertilizer and preparation method thereof |
| CN102786607A (en) * | 2011-05-19 | 2012-11-21 | 浙江海洋学院 | Preparation method of water-soluble chitosan-oligosaccharide |
| CN105669878A (en) * | 2016-03-28 | 2016-06-15 | 宁波科瑞特动物药业有限公司 | Modified oligochitosan for aquaculture and preparation method thereof |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1317967C (en) * | 2003-12-05 | 2007-05-30 | 李效时 | Chitin feed binder and its preparation method |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1571047A1 (en) * | 1988-03-24 | 1990-06-15 | Всесоюзный Научно-Исследовательский Институт Биотехнологии | Method of obtaining water-soluble oligosaccharides |
| JPH0222301A (en) * | 1988-07-12 | 1990-01-25 | Nippon Kayaku Co Ltd | Production of water-soluble chitosan |
| JPH0633321B2 (en) * | 1988-07-30 | 1994-05-02 | 唯師 井上 | Method for producing water-soluble chitosan |
| JPH07119244B2 (en) * | 1990-12-18 | 1995-12-20 | 唯師 井上 | Manufacturing method of water-soluble chitosan |
| JPH05230104A (en) * | 1992-02-21 | 1993-09-07 | Hitomi Sangyo:Kk | Production of water-soluble low-molecular chitosan |
| JPH05230460A (en) * | 1992-02-21 | 1993-09-07 | Hitomi Sangyo:Kk | Soil conditioner |
| JPH06293801A (en) * | 1993-04-07 | 1994-10-21 | Nippon Suisan Kaisha Ltd | Chitosan exhibiting water-solubility even in alkaline region and its production |
| RU2126012C1 (en) * | 1997-03-17 | 1999-02-10 | Российский Университет Дружбы Народов | Process for preparing water-soluble oligosaccharides |
-
2000
- 2000-04-17 CN CN00114484A patent/CN1108311C/en not_active Expired - Fee Related
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1332984C (en) * | 2004-03-17 | 2007-08-22 | 海南大学 | Method for preparing chitosan/chitose in molecular weight narrow distributed |
| CN1313500C (en) * | 2004-06-25 | 2007-05-02 | 中国科学院海洋研究所 | Preparation of chitin oligose compound |
| CN100447161C (en) * | 2005-05-16 | 2008-12-31 | 海南大学 | Method of microwave assistant degradation for preparing narrow molecular weight distributed Chitosan poly oligosaccharide |
| CN101168570B (en) * | 2007-11-15 | 2010-05-26 | 暨南大学 | Method for degrading kelp polysaccharide sulfate |
| CN102180993A (en) * | 2011-05-05 | 2011-09-14 | 大连鑫蝶泓祥甲壳素有限公司 | Production method of chitooligosaccharide |
| CN102786607B (en) * | 2011-05-19 | 2015-01-07 | 浙江海洋学院 | Preparation method of water-soluble chitosan-oligosaccharide |
| CN102786607A (en) * | 2011-05-19 | 2012-11-21 | 浙江海洋学院 | Preparation method of water-soluble chitosan-oligosaccharide |
| CN102321194A (en) * | 2011-08-12 | 2012-01-18 | 厦门蓝湾科技有限公司 | Method for preparing water-soluble chitosan with low molecular weight |
| CN102432378A (en) * | 2011-09-19 | 2012-05-02 | 北京雷力农用化学有限公司 | Foliar fertilizer and preparation method thereof |
| CN102352568A (en) * | 2011-10-26 | 2012-02-15 | 芜湖南翔羽绒有限公司 | Arrangement method for down feathers with antibacterial function |
| CN102352568B (en) * | 2011-10-26 | 2013-06-19 | 芜湖南翔羽绒有限公司 | Arrangement method for down feathers with antibacterial function |
| CN105669878A (en) * | 2016-03-28 | 2016-06-15 | 宁波科瑞特动物药业有限公司 | Modified oligochitosan for aquaculture and preparation method thereof |
| CN105669878B (en) * | 2016-03-28 | 2017-12-05 | 宁波科瑞特动物药业有限公司 | A kind of modification chitosan oligomer for aquaculture and preparation method thereof |
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|---|---|
| CN1108311C (en) | 2003-05-14 |
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