Journal
FOOD AND BIOPROCESS TECHNOLOGY
Volume 5, Issue 4, Pages 1197-1205Publisher
SPRINGER
DOI: 10.1007/s11947-010-0408-3
Keywords
Fish skin; Gelatin; Giant catfish; Re-extraction; Recovery
Categories
Funding
- Mae Fah Luang University
- Thailand Research Fund (TRF-MAG) [MRG-WII 525 S 088]
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This study was aimed to investigate the re-extraction process for gelatin recovery from the skin of farmed giant catfish. The first extraction was done by incubating the acid-treated fish skin at 45 A degrees C for 12 h. The remnant was re-extracted at temperatures of 60-90 A degrees C for 1-12 h. The gelatin yield of the first extraction was 10.14%, while the re-extraction at high temperature provided higher recovery (19.5%). Low band intensity of alpha(1) and alpha(2) chains of gelatin was observed when it was re-extracted at high temperature for a longer time. The absorption bands of amide I and II from both extracted gelatins were similar. Low-transition temperature with high transition enthalpy of gelatin extracted at 90 A degrees C was observed. The obtained results suggested that the re-extraction process could be applied as a supplemental step for other sources to obtain high recovery with the desired properties.
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