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Mineral Oil–Chitosan Emulsion Coatings Affect Quality and Shelf‐Life of Coated Eggs during Refrigerated and Room Temperature Storage
Author(s) -
Torrico Damir D.,
No Hong Kyoon,
Prinyawiwatkul Witoon,
Janes Marlene,
Corredor José A.H.,
Osorio Luis F.
Publication year - 2011
Publication title -
journal of food science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.772
H-Index - 150
eISSN - 1750-3841
pISSN - 0022-1147
DOI - 10.1111/j.1750-3841.2011.02125.x
Subject(s) - haugh unit , yolk , shelf life , emulsion , food science , coating , zoology , chemistry , biology , body weight , biochemistry , feed conversion ratio , endocrinology , organic chemistry
Effects of mineral oil (MO) and 4 emulsions (prepared with different emulsifier types) of MO and chitosan solution (CH) at a fixed ratio of MO:CH = 25:75 as coating materials in preserving the internal quality of eggs were evaluated during 5 wk at 25 °C and 20 wk at 4 °C. Generally, as storage time increased, Haugh unit and yolk index values decreased whereas weight loss increased. However, MO and/or 4 emulsion coatings minimized the weight loss (<1.5%) and preserved the albumen and yolk quality of eggs (with the final B grade) for at least 3 wk longer than those observed for noncoated eggs at 25 °C. At 4 °C, all coated eggs changed from AA to A grade after 5 wk and they maintained this grade for 10 wk (5 wk longer than that of noncoated eggs). Although refrigeration (4 °C) alone could maintain the B grade of noncoated eggs for up to 20 wk, coating treatments were necessary to keep the weight loss below 2%. Compared with 4 °C, the increasing weight loss showed stronger negative correlation ( P < 0.01) with the decreasing Haugh unit (–0.46 to –0.89) and yolk index (–0.36 to –0.89) at 25 °C. The emulsifier type used in this study generally did not affect the internal quality of eggs. Salmonella spp. detection was negative for all coated and noncoated eggs. This study demonstrated that MO and MO:CH emulsion coatings preserved the internal quality, prolonged the shelf‐life, and minimized weight loss (<2%) of eggs. Practical Application: Eggs are highly susceptible to internal quality deterioration. The most profound factor that affects quality deterioration rate of eggs is storage temperature. Nevertheless, in some developing regions of the world where refrigeration of eggs is seldom practiced, surface coating is an alternative method to preserve the internal quality of eggs and to prevent microbial contamination. This study demonstrated that MO:CH emulsion coatings could preserve the internal quality, prolong the shelf‐life, and minimize weight loss of eggs during storage.