Preparation method for carotenoid preparation having high bioavailability and high stability

1. A preparation method of carotenoid water-dispersible microcapsule with the preparation method comprising:

a) dissolving part of a water-soluble colloid and a filling substance in water to form an aqueous phase, wherein the water-soluble colloid is selected from the group consisting of gelatin, casein, and soy isolate protein, and wherein the filling substance is syrup;

b) adding a carotenoid crystal to the aqueous phase and stirring to form a dispersion liquid;

c) loading the dispersion liquid into a first-stage grinding machine for first grinding, wherein the first-stage grinding machine comprises a grinding medium made of beads, wherein the beads of the first-stage grinding machine have a bead size of 0.6-0.8 mm, performing the first grinding until particle size of the carotenoid crystal is 0.5-1.5 μm, and then stopping the first grinding to obtain a first grade grinding liquid;

d) adding the remaining water-soluble colloid and the filling substance to the first-stage grinding liquid, loading the first-stage grinding liquid with the remaining water-soluble colloid and the filling substance into a second-stage grinding machine for second grinding, wherein the second-stage grinding machine comprises a grinding medium made of beads, wherein the beads of the second-stage grinding machine have a bead size of 0.3-0.4 mm, performing the second grinding until the particle size of the carotenoid crystal is 150-600 nm, and then stopping the second grinding to obtain a second grade grinding liquid, wherein a total grinding time comprising the first grinding plus the second grinding is 0.5-2.0 hours; and

e) drying the moisture in the second-stage grinding liquid to obtain carotenoid dry powder or particles.

2. The preparation method of claim 1 , wherein the carotenoid is β-carotene, lutein, lycopene, canthaxanthin, zeaxanthin or astaxanthin.

3. The preparation method of claim 1 , wherein the grinding medium in the first-stage grinding machine and the second-stage grinding machine is a food-grade sanitary material, wherein the food-grade sanitary material is stainless steel with a grade of 306L, tungsten carbide, zirconia, or yttrium stabilized zirconia beads.

4. The preparation method of claim 1 , wherein in step a), an amount of the water-soluble colloid added is 5-95 wt. % of the total amount of water-soluble colloid, and an amount of the filling substance added is 5-95 wt. % of the total filling substance.

5. The preparation method of claim 1 , wherein in step b), a solid content of the dispersion is 5-50 wt. %.

6. The preparation method of claim 1 , wherein in step d), the amount of the remaining water-soluble colloid added is 95-5 wt. % of total amount of the water-soluble colloid, and the amount of the remaining filling substance added is 95-5 wt. % of total filling substance.

7. The preparation method of claim 1 , further comprising adding an antioxidant before the first grinding, wherein the antioxidant is selected from the group consisting of synthetic tocopherol, vitamin E, ascorbic acid and ascorbic palmitate.

8. The preparation method of claim 7 , wherein amount of the antioxidant added is 1.25%-5.0 wt. % of the mass of the final product.

9. The preparation method of claim 1 , wherein content of carotenoid in the carotenoid water-dispersible microcapsule is 1.0-30 wt. %.