Method for preparing stable-type vitamin A microcapsules continuously

Abstract

The invention discloses a method for preparing vitamin A microcapsules continuously and stably, comprising the following steps: Adding vitamin A crystals and an antioxidant in a crystal melter continuously according to a certain ratio under the protection of nitrogen to prepare vitamin A melting oil containing the antioxidant; pumping the above melting oil in a supergravity rotary packed bed emulsifier by a pump, and pumping aqueous solution containing modified gelation starch into the above supergravity rotary packed bed emulsifier after deoxidation treatment to obtain vitamin A emulsion at the outlet of the supergravity rotary packed bed emulsifier; and atomizing and spraying the emulsion in a cooled starch bed for pelletizing, and performing fluidization drying and gelation treatment in a fluidized bed by taking nitrogen as a drying medium to obtain the stable-type vitamin A microcapsules. The invention has the advantage of capability of continuous production, and has good embedding effect due to adopting the modified gelation starch, pelletizing and gelation treatment, thus the product has good storage stability.

Description

technical field [0001] The invention relates to a method for preparing continuous and stable vitamin A microcapsules, in particular to the preparation of continuous and stable vitamin A microcapsules by using a high-gravity rotating packed bed emulsifier. Background technique [0002] Vitamin A is a fat-soluble vitamin, easily soluble in organic solvents and fats, but insoluble in water. Vitamin A is easy to deteriorate when exposed to light, heat, acid, and oxidizing agents, so it generally needs to be made into microcapsules before it can be used. [0003] The microencapsulation of vitamin A is usually obtained by first heating and emulsifying vitamin A crystallization, oil blending and aqueous solution containing protective colloid, and then spray drying the emulsion. [0004] Chinese patent CN1965657 (A) introduces a method for preparing vitamin A microcapsules. In this method, vitamin A oil is added to the modified starch solution prepared in advance a few hours ago, d...

AI Technical Summary

Problems solved by technology

[0007] 1) The emulsification process is carried out in batches and in an open environment, the emulsification time of a single batch is long, and the temperature of the shearing part is high during emulsification, which easily deteriorates vitamin A;

[0008] 2) High-speed shears and high-pressure homogenizers require large motor power and high energy consumption;

[0009] 3) Due to the batch operation, after the emulsification is completed, the emulsion is easy to separate during the spray drying process, and the aggregated small vitamin A oil droplets are easy to aggregate and form large particles, thus affecting the embedding effect and bioavailability of the final product

[0010] 4) The high-pressure homogenization method is difficult to disperse vitamin A in microcapsules in nanometer size, which affects the use in some products

[0012] However, vitamin A is a fat-soluble and poorly stable vitamin. Even if it is spray-dried and microencapsulated, its effective content will still decrease significantly due to the influence of light, heat, oxidants, and acids during product storage.