Soft gelatin capsules are flexible because they contain plasticizers.

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Multiple Choice

Soft gelatin capsules are flexible because they contain plasticizers.

Explanation:
Flexibility comes from plasticizers that are added to the gelatin matrix. Plasticizers like glycerin or sorbitol insert themselves between gelatin chains, reducing intermolecular forces and lowering the glass transition temperature. This increases the mobility of the polymer chains, making the shell pliable at room temperature. Moisture helps, but the key factor making soft gelatin capsules flexible is the plasticizer content, not a lack of moisture or any other property. The other statements don’t explain why the shell can bend and deform without breaking, whereas plasticizers directly create that soft, elastic film.

Flexibility comes from plasticizers that are added to the gelatin matrix. Plasticizers like glycerin or sorbitol insert themselves between gelatin chains, reducing intermolecular forces and lowering the glass transition temperature. This increases the mobility of the polymer chains, making the shell pliable at room temperature. Moisture helps, but the key factor making soft gelatin capsules flexible is the plasticizer content, not a lack of moisture or any other property. The other statements don’t explain why the shell can bend and deform without breaking, whereas plasticizers directly create that soft, elastic film.

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