Chitosan and preparation method thereof
A technology of chitosan and chitosan gel, which is applied in the field of chitosan, can solve the problems of antibacterial properties, air permeability, and ripening of fruits and vegetables that cannot meet people's needs, and achieve the goal of promoting ripening of fruits and vegetables and improving air permeability Effect
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Embodiment 1
[0036] A preparation method of chitosan, comprising the following steps:
[0037] S1: Preparation of modified xylitol: take the peel, wash and chop it, use pure water to repeat 3-5 times to obtain deashed crumbs, put the deashed crumbs into the mixed enzyme aqueous solution, heat up to 10-20 ℃, keep it for 10-15h, and obtain the mixed solution of enzymatic hemicellulose and polysaccharide, heat and concentrate the mixed solution of enzymatic hemicellulose and polysaccharide, mix it with 1% sulfuric acid and stir evenly, raise the temperature to 100-110℃, keep 20-40min, to obtain the acid hydrolysis solution, add quicklime and pH regulator to the acid hydrolysis solution, adjust the pH value to 7-9, add activated carbon until the solution is completely decolorized, then separate the solid content, keep the solution, the solution is For the required xylitol solution, put the xylitol solution into a temperature-controlled reaction vat, raise the temperature to 20-25°C, introduce ...
Embodiment 2
[0045] A preparation method of chitosan, comprising the following steps:
[0046]S1: Preparation of modified xylitol: take the peel, wash and chop it, use pure water to repeat 3-5 times to obtain deashed crumbs, put the deashed crumbs into the mixed enzyme aqueous solution, heat up to 10-20 ℃, keep it for 10-15h, and obtain the mixed solution of enzymatic hemicellulose and polysaccharide, heat and concentrate the mixed solution of enzymatic hemicellulose and polysaccharide, mix it with 1% sulfuric acid and stir evenly, raise the temperature to 100-110℃, keep 20-40min, to obtain the acid hydrolysis solution, add quicklime and pH regulator to the acid hydrolysis solution, adjust the pH value to 7-9, add activated carbon until the solution is completely decolorized, then separate the solid content, keep the solution, the solution is For the required xylitol solution, put the xylitol solution into a temperature-controlled reaction vat, raise the temperature to 20-25°C, introduce e...
Embodiment 3
[0054] A preparation method of chitosan, comprising the following steps:
[0055] S1: Preparation of modified xylitol: take the peel, wash and chop it, use pure water to repeat 3-5 times to obtain deashed crumbs, put the deashed crumbs into the mixed enzyme aqueous solution, heat up to 10-20 ℃, keep it for 10-15h, and obtain the mixed solution of enzymatic hemicellulose and polysaccharide, heat and concentrate the mixed solution of enzymatic hemicellulose and polysaccharide, mix it with 1% sulfuric acid and stir evenly, raise the temperature to 100-110℃, keep 20-40min, to obtain the acid hydrolysis solution, add quicklime and pH regulator to the acid hydrolysis solution, adjust the pH value to 7-9, add activated carbon until the solution is completely decolorized, then separate the solid content, keep the solution, the solution is For the required xylitol solution, put the xylitol solution into a temperature-controlled reaction vat, raise the temperature to 20-25°C, introduce ...
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