The yield, visual appearance and odour of the gelatins were noted.
The analyses carried out were for: colour using the Hunter Ultrascan Sphere Spectrocolorimeter (Minolta Cr-300 series), melting point by the procedure described by Wainewright (1977), gel strength according to the British Standard (BS 757 :1975) using the TAXT2 Texture Analyser Stable Micro System, viscosity as measured in the computerized Brookfield DV III Rheometer (model RV), pH, and amino acid composition according to the Waters-501 Instruments manual.
The amino acids compositions of the gelatins were determined on a Waters-PICO-TAG amino acid auto analyser high performance liquid chromatography (Model: Waters 501), equipped with the amino acid analyzing software. The column used was the Waters- Pico Tag (measuring 3.9_150 mm).
Each sample was hydrolysed with 6 N-hydrochloric acid at 110 ๐C for 24 h.