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 α-chains as the predominant component, followed by β-chain. Gelling and melting temperatures of those gelatins were 23.02°C to 24.16°C and 33.07°C to 34.51°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.
Highlights
Gelatin is the protein obtained by thermal denaturation or partial hydrolysis of collagenous materials (Mohtar et al, 2010)
The present study aimed to investigate the impact of alkaline pretreatment conditions on characteristics and gel properties of gelatin from goat skin obtained from a slaughter house in the southern part of Thailand
Gelatin from skin pretreated with 0.5 M NaOH for 4 days had the lower yield, compared with those pretreated for 2 and 3 days (p
Summary
Gelatin is the protein obtained by thermal denaturation or partial hydrolysis of collagenous materials (Mohtar et al, 2010) It has many applications in food and non-food industries. Alkaline pretreatment (liming process) is established for gelatin extraction from mammalian skins and bones, which normally takes a few days to four months, depending on the type and concentration of lime used (Schrieber and Gareis, 2007). The extraction of gelatin from alternative mammals, especially by-products from goat slaughtering, e.g. skin or bone, should be taken into consideration.
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