Properties of film from splendid squid (Loligo formosana) skin gelatin with various extraction temperatures.
Properties of film from splendid squid (Loligo formosana) skin gelatin extracted at different temperatures (50-80°C) were investigated. Tensile strength (TS) and elongation at break (EAB) of films decreased, but water vapour permeability (WVP) increased (P<0.05) as the extraction temperature increased. Increase in transparency value with coincidental decrease in lightness was observed with increasing extraction temperatures. Electrophoretic study revealed that degradation of gelatin became more pronounced with increasing extraction temperatures. As a consequence, their corresponding films had the lower mechanical properties. FTIR spectra of obtained gelatin films revealed the significant loss of molecular order of the triple helix. Thermogravimetric analysis indicated that F80 exhibited the higher heat susceptibility and weight loss. Loosen structure was observed in film prepared from gelatin with increasing extraction temperatures. Thus, the temperature used for gelatin extraction from splendid squid skin directly affected the properties of corresponding films.
Department of Food Technology, Faculty of Agro-Industry, Prince of Songkla University, Hat Yai, Songkhla 90112, Thailand.
Muralidharan
M
Nagarajan
Soottawat
S
Benjakul
Thummanoon
T
Prodpran
Ponusa
P
Songtipya
D000818:Animals; D005780:Gelatin / Q000737:chemistry* / Q000302:isolation & purification*; D049834:Loligo / Q000737:chemistry*; D055595:Mechanical Phenomena; D010539:Permeability; D010858:Pigmentation; D012867:Skin / Q000737:chemistry*; D013696:Temperature; D014835:Volatilization; D014867:Water / Q000737:chemistry
D014867:Water; D005780:Gelatin