Preparation method of 5-aminolevulinic acid spray-dried powder

The invention relates to the field of feed production, in particular to a preparation method of 5-aminolevulinic acid spray-dried powder, which comprises the following steps: carrying out solid-liquid separation operation on 5-aminolevulinic acid fermentation liquor by using a centrifugal machine, and collecting supernate; acidifying the supernate, heating, carrying out solid-liquid separation operation on the treated liquid again by adopting plate-and-frame pressure filtration, collecting filtrate, filtering and sterilizing by utilizing a 100nm ceramic membrane, and adsorbing by using cation exchange resin to obtain 5-aminolevulinic acid eluent; and acidifying the eluent with a sulfuric acid solution until the pH value is 3.0-3.5, adding maltodextrin, stirring to obtain a stirred mixture, adding a moisture-proof agent to obtain a to-be-sprayed liquid, and preparing the to-be-sprayed liquid into spray-dried powder. According to the method, the content of viscous substances in the fermentation liquor can be re