The invention discloses a
gastric acid resistant
astaxanthin ester microcapsule and a preparation method thereof, and belongs to the technical field of
astaxanthin ester
processing and preparation. The preparation method comprises the following steps: dispersing
starch octenyl succinate in water, gelatinizing, cooling, mixing with a
chitosan solution, adding a
sodium chloride solution, and freeze-
drying to obtain rigid nanoparticles; dissolving natural
astaxanthin ester in the
oil phase to obtain astaxanthin ester oil; the preparation method comprises the following steps: dissolving rigid nanoparticles in water, adding astaxanthin ester oil, and shearing to obtain an astaxanthin ester
emulsion; and mixing with a
wall material solution, and carrying out
spray drying to obtain the
gastric acid-resistant astaxanthin ester microcapsule. The prepared astaxanthin ester microcapsule has
gastric acid resistance stability, degradation of astaxanthin ester in the
digestion and absorption process is reduced, more astaxanthin ester reaches the
small intestine stage to be absorbed into the body, and the utilization efficiency of astaxanthin is improved. The preparation method is simple in preparation process, does not use a small molecular surfactant in the process, is green and safe, and can be efficiently applied to the field of functional foods.