Film-forming composition containing gellan gum and starch, and application in soft capsule

A starch film-forming composition, comprising:

• (a) a first gelling agent;
• (b) starch;
• (c) a plasticizer;
• and
• (d) water;
• wherein the first gelling agent is a gellan gum with two gel temperatures, wherein the first gel temperature is 70° C., and the second gel temperature is 42° C.,
• wherein a weight ratio of the first gelling agent to the starch ranges from 0.05 to 0.1, and the starch is selected from the group consisting of:
• (i) a mixture of hydroxypropyl starch and an oxidized hydroxypropyl starch, wherein a weight ratio between the hydroxypropyl starch and the oxidized hydroxypropyl starch is 1:9;
• (ii) a mixture of a hydroxypropyl starch and an oxidized starch, wherein a weight ratio between the hydroxypropyl starch and the oxidized starch is 1:4;
• and
• (iii) a mixture of a hydroxypropyl starch and a hydroxypropyl distarch phosphate, wherein a weight ratio between the hydroxypropyl starch and the hydroxypropyl distarch phosphate is 2:1 to 9:1.