Introduction:
Gelatin is a natural biopolymer that is most widely used in food industry.
Commercial gelatin due to its social, cultural and religious reasons are not acceptable by some
therefore, gelatin extracted from fish processing waste might be employed as an al
More
Introduction:
Gelatin is a natural biopolymer that is most widely used in food industry.
Commercial gelatin due to its social, cultural and religious reasons are not acceptable by some
therefore, gelatin extracted from fish processing waste might be employed as an alternative
source for commercial gelatin.
Materials and Methods:
In order to optimize the extraction of gelatin from the skin of
Iranian beluga fish (
Huso huso), the effect of different concentrations of NaOH (0.01, 0.05
and 0.075 N) and Ca(OH)
2 (0.01, 0.05 and 0.075N) on the extraction yield, melting point,
viscosity, gel strength, colour and the molecular weight of extracted gelatin were
investigated.
Results:
The results indicated that the highest extraction yield was obtained when 0.05 N Ca
(OH)
2 was employed. The highest and lowest melting points (30.98 and 28.0°C) were related
to the treatments concerned with 0.01N NaOH and 0.05 N Ca (OH)2 respectively (p< 0.05).
The viscosities were increased as the alkali concentrations were reduced, however sodium
hydroxide concentration affected the viscosity more than calcium hydroxide (p<0.05). Gel
strength was affected more by 0.01N sodium hydroxide. There were not significant
differences between the treatments concerning colour changes.
Conclusion:
The results indicated that 0.01 N NaOH treatment produced gelatin with
improved functionality and characteristics.
Manuscript profile
