Effects of chitosan coating and storage position on quality and shelf life of eggs

Abstract

Effects of chitosan coating and storage positions (small-end down, small-end up or horizontal) on internal quality and shelf life of eggs were evaluated during 5 weeks of storage at 25°C. Compared with noncoated eggs, all chitosan-coated eggs, irrespective of storage positions, had significantly lesser weight loss, higher Haugh units and higher yolk index throughout the storage. Chitosan coating, irrespective of storage positions, extended the egg shelf life by at least 3 weeks at 25°C compared with noncoated eggs. Noncoated and chitosan-coated eggs placed small-end down tentatively showed better quality than eggs placed smallend up after 3 and 4 weeks of storage. After 5 weeks of storage, storage positions did not significantly affect quality of noncoated and chitosan-coated eggs. There were no notable differences in total amino acid content of the albumen and fatty acid composition of the yolk between noncoated and chitosan-coated eggs after 5 weeks of storage.

Influence of Edible Coating Techniques on Quality Characteristics of Eggs

“…Five eggs per each treatment were taken at 1 week intervals for determination of weight loss, Haugh unit, yolk index and albumen pH (Kim et al . ).…”

“…The weight of whole eggs was measured with a balance (TS400S, Ohaus Corp) according to the method given by Kim et al . (). …”

Chitosan-soybean oil emulsion coating affects physico-functional and sensory quality of eggs during storage

“…Chitosan (CH, molecular weight of 223 kDa, acid soluble and white-coloured powder prepared from crab leg shell) obtained from Biotech (Mokpo, South Korea) and soybean oil (SO, Great value Ò , WalMart, AR, USA) were used as coating materials for the eggs. CH with the final pH of 4.52 was prepared by dissolving chitosan in 1 mL/100 mL (v/v) acetic acid at 2 g/100 mL (w/v) concentration (Kim, Youn, No, Choi, & Prinyawiwatkul, 2009). An emulsion of CH and SO with CH:SO ¼ 40:60 ratio was prepared by dispersing 1 mL/100 mL of Tween Ò 80 (Polyoxyethylene-20-sorbitan monooleate, reagent grade; Amresco Ò Inc., Solon, OH, USA) emulsifier in CH to which SO was subsequently added.…”

“…Two coating treatments: SO and CH:SO ¼ 40:60 emulsion, and one uncoated control were evaluated in this study. Upon drying, the coated eggs were placed small end down (Kim et al, 2009) on egg racks and stored at both room temperature (25 AE 2 C) and in a cold room at 4 C. Quality measurements were done on two replicates (six eggs/replicate) per each treatment (twelve eggs total/treatment) weekly for 7 weeks at 25 C and at intervals of 5 weeks for 15 weeks at 4 C. The weight (W) of the egg (g) was measured using a balance (Model TS400S, Ohaus Corp., Florham Park, NJ, USA). The height of yolk (mm) and albumen (H, mm) was measured using a tripod micrometer (Model S-6428, B.C.…”

Ki̇tosan Ve Anti̇mi̇krobi̇yal Özelli̇kleri̇

“…Bu sonuçlar kitosanla kaplama işleminin bir gaz bariyeri olarak rol oynadığını ve dolayısıyla nem ve karbondioksitin kabuktan geçmesini engellediğini doğrulamaktadır. Kitosan-lizozim karışımı ile kaplanan ve 10°C'de depolanan yumurtalarda L. monocytogenes, Salmonella enterica, koliform, maya ve küflerin gelişiminin inhibe olduğu, nem kaybı ve pH değişimlerinin geciktiği bildirilmiştir [138,139].…”