Treated with various methods, body muscle of squid was cross section, stained by Van Gieson staining method, and observed microscopically to study on the state of thin layer of skin separated from meat.
Results obtained were summarized as follows :
1. By general hot string treatment were 1st. 2nd. and 3rd. layers of skin removed from squid muscle but 4th. not.
2. By boiling treatment was tissue of muscle fibre fissured largely toward the muscle fibre.
3. Sodium acetate treatment was superior to sodium nitrate, sodium sulfate and sodium tartrate treatment in the effect that the skin was separated from meat. Especially, concentrate solution of sodium acetate had the most excellent effect in the chemical reagent treatment.
4. By proteolytic enzyme treatment were 1st. 2nd. 3rd. and 4th. layers of skin removed all from squid muscle and the boundary fibre between skin and meat swelled in particular.
5. Two kinds of skin removing method, proteolytic enzyme treatment and sodium acetate treatment, ere desirable to the actual processing.
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