The culture medium generally contains starch, protein, sugar, etc. Each formula is different. Generally, professional technical researchers will not disclose it. Coconut juice, apple, potato, banana... those are all It’s just the usual ingredients. The most important thing is the formula of the mother liquor. I don’t know what the ingredients are, because it is also a patent owned by other technical researchers. If they reveal it, they will be robbed of their jobs. Those ordinary ingredients are in the university biology and botany course. It seems that there is, you can check online to get a rough idea