A kind of oligoacetylamino sugar acid and selective oxidation preparation method
A polyacetylamino sugar acid and selective technology, which is applied in the field of oligomer acetylamino sugar acid and selective oxidation preparation, can solve the problems of few reaction sites, low yield, slow reaction and the like, and achieves good hydrophilicity, Apply a wide range of effects
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Examples
Embodiment 1
[0023] A selective oxidation preparation method of oligoacetylamino sugar acid, the steps are as follows:
[0024] The flaky chitin from prawns was processed to 0.5mm pieces with a pulverizer. Mix the hydrochloric acid solution with a mass concentration of 7% and 5g of chitin fragments at a liquid-to-solid ratio of 10:1, put them into a hydrolysis reactor, and react at 120°C for 45 minutes. Filter the solid and wash it until it is dried with neutral hot air to obtain low molecular weight chitin for later use. Mix 50g of calcium chloride, 24ml of deionized water and 100ml of anhydrous methanol to form a calcium chloride methanol solution. The standby low molecular weight chitin was dissolved in calcium chloride methanol solution, and after 6 hours, the regenerated chitin was precipitated with deionized water. After drying at 60°C, 4.5 g of low molecular weight regenerated chitin powder was obtained.
[0025] Add the aqueous low-molecular-weight regenerated chitin (equivalent...
Embodiment 2
[0028] A selective oxidation preparation method of oligoacetylamino sugar acid, the steps are as follows:
[0029] Take 10g of chitin from crab shells, crush it to 0.3mm, mix it with 8% sulfuric acid solution at a liquid-solid ratio of 12:1, and heat it to 150°C in a hydrolysis reactor for 60 minutes. After naturally cooling to room temperature, the solid was filtered, washed and dried with neutral hot air to obtain low molecular weight chitin. 3 g of them were dissolved in the calcium chloride methanol solution described in Example 1 to finally obtain 2.7 g (dry weight) of low molecular weight regenerated chitin.
[0030] Weigh 1g of water-containing low molecular weight regenerated chitin equivalent to dry weight and add it to 20ml of deionized water, then add 15mg of TEMPO, 0.4g of NaBr and 30ml of NaClO reagent, adjust the reaction solution to pH=9~10, stir at room temperature and electromagnetically for 6 hours, stop reaction. The reaction product was precipitated with ...
Embodiment 3
[0032] The selective oxidation preparation method of oligoacetylamino sugar acid, the steps are as follows:
[0033] (1) Process the flaky chitin to 0.5mm fragments with a pulverizer, mix the hydrochloric acid solution with a mass concentration of 5% and 5g chitin fragments at a liquid-solid ratio of 8:1, put them into a hydrolysis reaction kettle, and heat them at 170°C. React for 90 minutes; filter the solid and wash until dried with neutral hot air to obtain low molecular weight chitin for later use;
[0034] (2) Mix calcium chloride, anhydrous methanol and deionized water to prepare a calcium chloride methanol solution with a calcium chloride molar concentration of 3.5M, and the water content is 1.5 times the molar number of calcium chloride. Molecular weight chitin is dissolved in calcium chloride methanol solution, the mass concentration of chitin is 3%, after 6 hours of normal temperature treatment, the regenerated chitin is precipitated with deionized water, and the lo...
PUM
| Property | Measurement | Unit |
|---|---|---|
| particle diameter | aaaaa | aaaaa |
| degree of polymerization | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More