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Obtaining protein isolate of tilapia ( Oreochromis niloticus ) and its application as coating in fresh‐cut melons
Author(s) -
Chevalier Raquel Costa,
Pizato Sandriane,
de Lara Jorge Antonio Ferreira,
CortezVega William Renzo
Publication year - 2018
Publication title -
journal of food safety
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.427
H-Index - 43
eISSN - 1745-4565
pISSN - 0149-6085
DOI - 10.1111/jfs.12496
Subject(s) - oreochromis , food science , melon , shelf life , tilapia , preservative , flesh , flavor , coating , biology , chemistry , horticulture , fish <actinopterygii> , fishery , organic chemistry
The present work thus aimed to evaluate the effects of the acidic and basic protein isolates as edible coatings on the physical, chemical, and microbiological characteristics of fresh‐cut melons. Three treatments were used: (T1) control (melon without coating); (T2) 1.5% acidic protein isolates (API), 1.5% Clove essential oil (CEO); (T3) 1.5% basic protein isolates (BPI), and 1.5% CEO. The results were analyzed statistically by the analysis of variance. The API had the highest percentage of protein (93.05%), when compared to the BPI that obtained 92.77%. Tilapia protein isolate coatings T2 and T3 presented the least growth of psychrotrophs, molds, and yeasts. All treatments showed the absence of Salmonella and thermotolerant coliforms in 25g of sample. It was concluded that treatment T3 showed lower mass loss (7.54%), lower microbial growth, lower decrease in firmness, greater acceptability in the sensorial analysis, presenting the best results on the coating of fresh‐cut melons. Practical applications Fresh‐cut melons are appreciated worldwide for their flavor and nutritional composition. However, their shelf life is limited by changes in color, texture, appearance, and microbial growth. An alternative to minimize the losses and increase the shelf life of this product is the use of edible coatings which can maintain the quality parameters of fresh fruit. Protein isolate of tilapia ( Oreochromis niloticus ) obtained by acid and basic processes could be used as a carrier of preservative solution This can also be used together with clove essential oil as edible coating in fresh‐cut melons. It can be considered useful to the minimal processing industry and also used as an alternative to fast food and other ready‐to‐eat products, attending the demand for healthy and convenient foodstuffs.