Nanocellulose-pectin microcapsule and preparation method and application thereof

[0051] The extraction method of citrus nanocellulose specifically comprises the steps:

[0052] Weigh 100g of citrus peel powder, add 1L 20g / L NaOH solution and heat at 100°C for 2h to remove the soluble fiber and hemicellulose, and filter the residue; add the filter residue to 1L NaClO 2 acetic acid buffer solution, heated at 80°C for 2 hours, and repeated this process twice to remove lignin to obtain citrus cellulose, and finally filter out the residue and dry it at 50°C for later use; weigh 10g of dried citrus cellulose Added to 300g 60% (w / w) H 2 SO 4 Stir and hydrolyze at 50°C for 1 hour. After the hydrolysis is completed, add deionized water to dilute 10 times to stop the hydrolysis reaction. Repeat centrifugation at 10,000 rpm until the centrifugation fails to form a suspension. Keep the suspension and dialyze it in deionized water until it is neutral. Nanocellulose.

[0053] The extraction method of citrus pectin, comprises the steps:

[0054] Dry the citrus peel

[0067] Microcapsules were prepared according to the method of Example 1 of the present invention, with the difference that the pH value of the polyethylene glycol solution containing cationic nanocellulose was adjusted to 5 to obtain nanocellulose-pectin microcapsules.

[0069] Microcapsules were prepared according to the method of Example 1 of the present invention, with the difference that the pH value of the polyethylene glycol solution containing cationic nanocellulose was adjusted to 3 to obtain nanocellulose-pectin microcapsules.

[0070] Utilize optical microscope to observe the microcapsule that forms, the result of the embodiment of the present invention 2 and 3 is as follows figure 1 As shown, when the pH value is acidic, the formed microcapsule structure is more uniform, especially when the pH is 3, the wall of the microcapsule is thicker, which can improve the mechanical strength of the microcapsule and prevent it from being destroyed.