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http://dx.doi.org/10.5713/ajas.15.0784

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)
Publication Information
Asian-Australasian Journal of Animal Sciences / v.29, no.6, 2016 , pp. 845-854 More about this Journal
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
Goat; Gelatin; Skin; Pretreatment; Alkaline; Gel Strength;
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