Journal
FOOD HYDROCOLLOIDS
Volume 47, Issue -, Pages 61-68Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodhyd.2015.01.005
Keywords
Film; Fish myofibrillar protein; Gelatin hydrolysate; Glycerol; Plasticizer; Plasticizing effect
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Funding
- Songkla University
- Higher Education Research Promotion
- National Research University Project of Thailand, Office of the Higher Education Commission
- TRF Distinguished Research Professor Grant
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The effect of fish gelatin hydrolysates having different degree of hydrolysis (DH: 23, 61 and 95%) as plasticizer at various levels (30-60%) in fish myofibrillar protein (FMP) film was investigated, in comparison with glycerol. Regardless of DH, FMP films incorporated with gelatin hydrolysates at 50 and 60% of FMP generally had higher elastic modulus (E) and tensile strength (TS) but lower water vapour permeability (WVP), compared with those added with glycerol at the same level (p < 0.05). At the same DH, both E and TS of film decreased, while elongation at break (EAB) and WVP increased with increasing levels of gelatin hydrolysate (p < 0.05). When gelatin hydrolysate at the same level (30, 40, 50 or 60%) was used, the decreases in TS and E but the increases in WVP were found as DH increased. Nevertheless, FMP film added with gelatin hydrolysate exhibited the higher b* value, compared to film containing glycerol (p < 0.05). Thus, gelatin hydrolysate could be potentially used as a plasticizer in FMP film and its plasticizing effect was governed by DH and levels used. (C) 2015 Elsevier Ltd. All rights reserved.
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