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TIP Revista Especializada en Ciencias Químico-Biológicas

2017, Número 1

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TIP Rev Esp Cienc Quim Biol 2017; 20 (1)


Comportamiento volumétrico de la DL-valina en soluciones acuosas de nitrato de sodio a diferentes temperaturas

Páez-Meza M, Ramos-Montiel J, De La Espriella-Vélez N

Idioma: Español
Referencias bibliográficas: 41
Paginas: 5-15
Archivo PDF: 336.85 Kb.


RESUMEN

Se determinaron las densidades de la DL-valina (Ácido 2-amino-3-metilbutanoico) en soluciones acuosas de nitrato de sodio en el intervalo de temperaturas desde 283.15 K hasta 318.15 K usando un densímetro de tubo vibratorio Anton Paar DMA 5000. Se calcularon: los volúmenes molares aparentes, los volúmenes molares aparentes a dilución infinita, la segunda derivada de los volúmenes molares parciales a dilución infinita con respecto a la temperatura, así como los volúmenes molares parciales de transferencia y los números de hidratación. Los resultados obtenidos se discutieron en términos de las interacciones predominantes en solución, encontrándose que la DL-valina tiene un efecto disruptor de la estructura del solvente y que a dilución infinita predominan las interacciones soluto-solvente entre el grupo isopropil del aminoácido y los iones sodio y nitrato.


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