Preparation method of N-2-hydroxypropyl trimethyl ammonium chloride chitosan/ N,O-carboxymethyl chitosan naonparticle
A technology of hydroxypropyltrimethylammonium chloride and carboxymethyl chitosan, which is applied in the field of preparation of chitosan nanoparticles, can solve the problem of harsh process conditions, difficult cleaning of cross-linking agents or emulsifiers, and cumbersome operations and other problems, to achieve the effect of simple preparation process, relatively low cost and simple operation
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specific Embodiment approach 1
[0018] Specific embodiment one: present embodiment N-2-hydroxypropyltrimethylammonium chloride chitosan / N, the preparation method of O-carboxymethyl chitosan nanoparticle, realizes according to the following steps:
[0019] 1. Put 5g of powdered chitosan in a 250mL three-neck flask, add 40mL of isopropanol and stir, soak for 1 to 12 hours, then add 60mL of NaOH solution with a concentration of 10 to 40mol / L, stir well and soak for 2 to 24 hours, Obtain alkalized chitosan;
[0020] 2. Heat 20g of chloroacetic acid in a water bath and dissolve it in 10mL of isopropanol, add it to the alkalized chitosan in 5 times under stirring, with an interval of 10 minutes each time, and then react at 40-80°C for 2-8 hours. Prepare the carboxymethyl chitosan mixture, then add 20mL of distilled water, adjust the pH to 7.0 with hydrochloric acid with a volume concentration of 1%, then suction filter with a Buchner funnel, add 4 times the amount of absolute ethanol to the filtrate to fully preci...
Embodiment 1
[0032] N-2-hydroxypropyltrimethylammonium chloride chitosan / N, the preparation method of O-carboxymethyl chitosan nanoparticle, realizes according to the following steps:
[0033] 1. Put 5g of powdered chitosan in a 250mL three-neck flask, add 40mL of isopropanol and stir, soak for 2 hours, add 60mL of NaOH solution with a concentration of 30mol / L, stir well and soak for 2 hours to obtain alkalized chitosan ;
[0034] 2. Heat 20g of chloroacetic acid in a water bath and dissolve it in 10mL of isopropanol, add it to the alkalized chitosan in 5 times under stirring, with an interval of 10min each time, and then react at 70°C for 8h to obtain carboxymethyl base chitosan mixture, then add 20mL of distilled water, adjust the pH to 7.0 with hydrochloric acid with a volume concentration of 1%, and then filter with Buchner funnel, add 4 times the amount of absolute ethanol to the filtrate to fully precipitate, filter, and then use Wash with ethanol and absolute ethanol with a volume ...
specific Embodiment approach 2
[0041] Embodiment 2: The difference between this embodiment and Embodiment 1 is that in step 1, after soaking for 4 hours, add 60 mL of NaOH solution with a concentration of 20 mol / L, stir well and then soak for 5 hours. Other steps and parameters are the same as those in Embodiment 1.
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