Incurred Arsenic Residues in Chicken Eggs

Area of Science:

• Food Science
• Animal Nutrition
• Toxicology

Background:

• Organic arsenicals are used as feed additives for poultry.
• Concerns exist regarding arsenic accumulation in edible products like eggs.
• Understanding arsenic residue dynamics is crucial for food safety.

Purpose of the Study:

• To quantify arsenic residues in egg components (yolk and albumen) from laying hens fed organic arsenicals.
• To determine the dose-dependent relationship between dietary arsenic and egg residue levels.
• To assess the impact of refrigerated storage on arsenic residues in eggs.

Main Methods:

• Laying hens were fed diets containing arsanilic acid or roxarsone at varying elemental arsenic concentrations (14-112 ppm) for 10 weeks.
• Arsenic residues in egg yolk and albumen were measured weekly using atomic absorption spectroscopy.
• Eggs were stored under refrigeration (4°C) for up to 4 weeks to evaluate storage effects.

Main Results:

• Arsenic residues accumulated in both yolk and albumen in a dose-dependent manner.
• Yolk contained significantly higher arsenic concentrations (95% of total) compared to albumen.
• Hens fed 112 ppm arsenic from arsanilic acid produced eggs exceeding the FDA tolerance level of 500 ppb.
• Refrigerated storage did not increase yolk arsenic levels, but albumen residues showed minor increases in some cases.

Conclusions:

• Dietary organic arsenicals lead to significant arsenic accumulation in chicken eggs, primarily in the yolk.
• High levels of arsenic exposure can result in egg residues surpassing regulatory limits.
• Refrigeration has a minimal effect on arsenic residue levels in eggs, suggesting limited impact on food safety during storage.