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Characteristics and gel properties of gelatin from goat skin as affected by pretreatments using sodium sulfate and hydrogen peroxide
Author(s) -
MadAli Sulaiman,
Benjakul Soottawat,
Prodpran Thummanoon,
Maqsood Sajid
Publication year - 2016
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.7336
Subject(s) - gelatin , hydrogen peroxide , chemistry , nuclear chemistry , yield (engineering) , sodium sulfate , sodium , chromatography , sodium dodecyl sulfate , biochemistry , organic chemistry , materials science , metallurgy
BACKGROUND Goat skin can be used as an alternative raw material for gelatin production, in which pretreatment conditions can determine the characteristics or properties of the resulting gelatin. The present study aimed to investigate the effect of pretreatment using sodium sulfate ( Na 2 SO 4 ) and hydrogen peroxide ( H 2 O 2 ) on properties of goat skin gelatin. RESULTS Pretreatment of skin using Na 2 SO 4 (0–1 mol L −1 ) increased the yield of gelatin in a concentration‐dependent manner. When skins with prior Na 2 SO 4 treatment were bleached using H 2 O 2 (0–2 mol L −1 ), the resulting gelatin showed higher yield and gel strength than those without prior Na 2 SO 4 treatment. All gelatins had α‐chain as a major component, followed by β‐chain. The degradation induced by H 2 O 2 was lower in gelatin with prior Na 2 SO 4 treatment. L * values increased with increasing H 2 O 2 concentrations ( P < 0.05) due to the bleaching effect of H 2 O 2 . With Na 2 SO 4 and H 2 O 2 pretreatments, gelatin gel had a finer and more ordered microstructure. Gelatin had an imino acid content of 217 residues/1000 residues with gelling and melting temperature of 22.49 and 32.28 °C, respectively. CONCLUSION The optimal pretreatment conditions for gelatin extraction from goat skin included soaking the skin in 0.75 mol L −1 NaOH , followed by treatment using 0.75 mol L −1 Na 2 SO 4 and subsequent bleaching with 2 mol L −1 H 2 O 2 . This resulted in gelatin with superior quality to the untreated counterpart. © 2015 Society of Chemical Industry