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Characteristics and Gel Properties of Gelatin from Goat Skin as Influenced by Alkaline-pretreatment Conditions

  • Mad-Ali, Sulaiman (Department of Food Technology, Faculty of Agro-Industry, Prince of Songkla University) ;
  • Benjakul, Soottawat (Department of Food Technology, Faculty of Agro-Industry, Prince of Songkla University) ;
  • Prodpran, Thummanoon (Department of Material Product Technology, Faculty of Agro-Industry, Prince of Songkla University) ;
  • Maqsood, Sajid (Department of Food Science, College of Food and Agriculture, United Arab Emirates University)
  • Received : 2015.09.18
  • Accepted : 2015.12.06
  • Published : 2016.06.01

Abstract

Characteristics and properties of gelatin from goat skin pretreated with NaOH solutions (0.50 and 0.75 M) for various times (1 to 4 days) were investigated. All gelatins contained ${\alpha}$-chains as the predominant component, followed by ${\beta}$-chain. Gelling and melting temperatures of those gelatins were $23.02^{\circ}C$ to $24.16^{\circ}C$ and $33.07^{\circ}C$ to $34.51^{\circ}C$, respectively. Gel strength of gelatins increased as NaOH concentration and pretreatment time increased (p<0.05). Pretreatment for a longer time yielded gelatin with a decrease in $L^*$-value but an increase in $b^*$-value. Pretreatment of goat skin using 0.75 M NaOH for 2 days rendered the highest yield (15.95%, wet weight basis) as well as high gel strength (222.42 g), which was higher than bovine gelatin (199.15 g). Gelatin obtained had the imino acid content of 226 residues/1,000 residues and the gelatin gel had a fine and ordered structure. Therefore, goat skin gelatin could be used as a potential replacer of commercial gelatin.

Keywords

References

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