Method and device for producing liquid culture medium composition

A method for producing a liquid medium composition, comprising

• using a junction conduit structure consisting of a first inlet conduit and a second inlet conduit joined together to form an outlet conduit, and
• flowing a first liquid containing a particular compound of the following (i) into the first inflow conduit and flowing a second liquid containing a linking substance of the following (ii) into the second inlet conduit, and allowing the flows of the first and second liquids to join together to sterilely mix the first and second liquids in a closed system configuration without allowing the first and second liquids to contact the outside air,
• thus forming the liquid medium composition comprising structures formed by the particular compound linked via the linking substance dispersed therein while being flown through the outlet conduit:
• (i) a particular compound which is a polymer compound having an anionic functional group, and capable of forming a structure by linking via a divalent metal cation, which structure being capable of suspending a cell or a tissue,
• (ii) a linking substance which is a divalent metal cation,
• wherein the first liquid has a flow velocity of 0.5 m/min to 250 m/min, and the second liquid has a flow velocity of 0.5 m/min to 250 m/min.