Method for preparing food-function coating by utilizing polysialic acid and nisin
A technology of nisin and polysialic acid, which is applied in food coating, food preservation, and protein-containing food ingredients, etc., can solve the problems of affecting the quality of fresh food, prolonging the shelf life of fresh food, and limited health effects. Achieve the effects of reducing nutritional damage, good antiseptic performance, and improving food quality
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Embodiment 1
[0048] This embodiment provides a method for preparing a food functional coating using polysialic acid and nisin, the steps are as follows:
[0049] (1) Remove some acyl groups on the molecular chain of polysialic acid (acyl group removal rate is 25%-50%): dissolve 100mg polysialic acid powder in 200mL, 0.5M sodium hydroxide solution, place in 80°C water bath The solution was treated in a pot for fifteen minutes, and the resulting solution was adjusted to pH 7 with concentrated hydrochloric acid, and there were a large number of amino groups on the polysialic acid chain after partial removal of acyl groups.
[0050] (2) Reaction of polysialic acid and nisin: Add 100 mg of nisin to the polysialic acid solution deacylated in the previous step, oscillate evenly, and place in a constant temperature incubator at 37°C for 24 hours to react.
[0051] (3) Purification: The reaction solution obtained in step (2) is concentrated to 50 mL with a 3000 Da tangential flow ultrafilter, then ...
Embodiment 2
[0057] This embodiment provides a method for preparing a food functional coating using polysialic acid and nisin, the steps are as follows:
[0058] (1) Remove some acyl groups on the molecular chain of polysialic acid (acyl removal rate is 25%-50%): dissolve 10 mg of polysialic acid powder in 20 mL of 0.1 M sodium hydroxide solution, and place in a water bath at 40 ° C The solution was treated in a pot for 60 minutes, and the obtained solution was adjusted to pH 5 with concentrated hydrochloric acid with a mass concentration of 0.05%, and there were a large number of amino groups on the polysialic acid chain after partial removal of acyl groups.
[0059] (2) Reaction of polysialic acid and nisin: 10 mg of nisin was added to the polysialic acid solution deacylated in the previous step, oscillated evenly, and placed in a constant temperature incubator at 20°C for 40 hours to react.
[0060] (3) Purification: Concentrate the reaction liquid obtained in step (2) to 25 mL with a 1...
Embodiment 3
[0064] This embodiment provides a method for preparing a food functional coating using polysialic acid and nisin, the steps are as follows:
[0065] (1) Remove some acyl groups on the molecular chain of polysialic acid (acyl group removal rate is 25%-50%): dissolve 50 mg of polysialic acid powder in 100 mL, 0.5 M sodium hydroxide solution, and place in a water bath at 60 ° C The solution was treated in a pot for 40 minutes, and the obtained solution was adjusted to pH 7 with concentrated hydrochloric acid with a mass concentration of 3%, and there were a large number of amino groups on the polysialic acid chain after removing part of the acyl groups.
[0066] (2) Reaction of polysialic acid and nisin: 50 mg of nisin was added to the polysialic acid solution deacylated in the previous step, oscillated evenly, and placed in a constant temperature incubator at 35° C. for 30 hours to react.
[0067] (3) Purification: Concentrate the reaction liquid obtained in step (2) to 30 mL wi...
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