The Greater Rhea (Rhea americana) is a member of Brazilian fauna with potential for the production of eggs with a unique nutritional composition that differs from the eggs of other species. The present study aimed to gather information regarding the centesimal composition of Greater Rhea eggs and the storage time for the preservation of egg quality for human consumption. Twenty-five Greater Rhea eggs (albumen and yolk fractions), distributed into five groups of eggs stored for 7, 14, 21, 28 and 35 days at 10 °C, were analysed. For the determinations of the percentage composition, total protein was quantified by the Kjeldahl method and total lipids by the Soxhlet method. To assess egg quality, the Haugh unit (HU), pH, and protein degradation (by SDS PAGE electrophoresis) were determined. Based on the results, the albumen protein fraction quality was maintained for 21 days, while the yolk proteins began to denature on the 14th day. The total lipids of the albumen and yolk fractions did not change significantly until the 35th day of storage; at this time, the quality decreased significantly, indicating that the eggs were adequate for consumption until the 28th day. Considering the protein degradation profile and internal quality, Greater Rhea eggs can be stored for 21 days at 10 °C without alteration of their nutritional or functional characteristics.
RESUMO O presente trabalho foi realizado com o objetivo de desenvolver um método para a determinação de CMP em leite UAT por meio da aplicação da espectroscopia de infravermelho próximo. Leites UAT de oito marcas diferentes foram utilizados para a construção dos modelos de calibração. Os resultados demonstram que, para o desenvolvimento de um modelo de calibração adequado para a determinação de CMP em leite UAT, deve-se utilizar, juntamente com o método de regressão PLS, o método de seleção de espectros máxima distância e os pré-tratamentos 2ª derivada e variável normal padronizada. Além disso, pôde-se determinar que as regiões do infravermelho próximo mais correlacionadas com os movimentos vibracionais dos aminoácidos presentes no CMP foram: 1100-1310; 1400-1430; 1490-1550; 1640-1680; 1780-1970; 2020-2100 e 2310-2350nm. Conclui-se que a espectroscopia de infravermelho próximo pode ser uma alternativa para a determinação de CMP em leite UAT, desde que haja um conjunto de calibração com amostras representativas da população a ser predita no futuro.
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