Resíduo de própolis vermelha: uma alternativa para a conservação de ovos de poedeiras comerciais

Abstract

ABSTRACT

The objective was to evaluate the internal and microbiological quality of commercial laying eggs submitted to the superficial coating of the shell with red propolis residue, at different storage periods and conditioned under refrigeration and at room temperature. 672 commercial laying eggs were used, from a farm located in the municipality of União dos Palmares, in the region of the forest area of Alagoas. 448 eggs used for internal quality analysis and 224 used for microbiological evaluation. All eggs were weighed and then distributed in a completely randomized design in a 4x7x2 factorial scheme (shell treatments x storage periods x temperatures) with 8 replicates. The different types of surface treatments of bark consisted of: uncoated treatment (T1 - control); with extract of red propolis residue at 10% dilution (T2), 20% (T3) and 30% (T4), evaluated during seven storage periods (1; 5; 10; 15; 20; 25 and 30 days). For the internal quality analyzes, it was observed that the eggs showed an increase in weight loss, a decrease in specific weight, an increase in the weight of the yolk and the pH of the yolk, in addition to a reduction in the albumen pH and its respective weight with the advance of storage time when kept at room temperature, regardless of the use of coating on the shell. The superficial treatment with 20% propolis residue extract provided better protection against this progressive weight loss and decrease in specific weight, when it was found that these were less intense with the advance of the storage period without refrigeration. When kept under refrigeration, eggs showed less weight loss, higher specific weight, as well as higher yolk and albumen weights. Eggs kept under refrigeration and superficially treated with propolis residue extract (20% and 30%) showed similar Haugh Unit values, being considered throughout the experimental period as high quality eggs. For the microbiological parameters evaluated, it was observed that, regardless of storage environments and surface treatment of the skin, there was no microbial growth during the 30 days of storage. According to the results of the present study, it is feasible to use the propolis residue extract at 20% and 30% dilution as an alternative for surface treatment of egg shells under internal and microbiological quality up to 30 days of storage when stored under refrigeration.

Keywords: egg quality, Haugh unit, microbiology.