Introduction to the study of the changes in sunflower seeds during their storage | Introducción al estudio de la alteración de la semilla de girasol durante su almacenamiento

English. A comparative study has been performed to examine the alterations occurring in sunflower seeds during their storage in an air atmosphere and in a nitrogen current. Two kinds of seeds with different moisture contents were used to examine the influence of this parameter: seeds from the Ukraine with about 5% humidity, and Spanish seeds (from the Central region), with about 12% humidity. The Ukrainian seeds stored in an air atmosphere were kept at 20°C in a room with about 50% humidity, while those stored in a nitrogen current were kept in the laboratory. The seeds with a high moisture content were stored in the laboratory irrespective of the storage atmosphere used. Samples of seeds were taken periodically, and their moisture content was analyzed as was the acidity, p-anisidine, k270 and k232 values and % polar compounds of their crude oil.

Spanish; Castilian. Se ha estudiado comparativamente la evolución de la alteración entre almacenamiento con atmósfera de aire y con corriente de nitrógeno, empleando semilla de dos tipos, para estudiar igualmente la influencia de su humedad: semilla ucraniana, con humedad en torno al 5%, y semilla española (zona centro), con humedad superior al 12%. En el caso de semilla ucraniana, el almacenamiento se ha realizado en cámara del 50% de humedad y 20ºC para el caso del aire y en laboratorio para el almacenamiento con corriente de nitrógeno. La semilla de alta humedad ha sido conservada en el laboratorio, tanto para ambiente de aire como para la corriente de nitrógeno. A las muestras de semilla, tomadas periódicamente, se les realizaron análisis de humedad, mientras que al aceite crudo extraído de ellas se les realizaron análisis de grado de acidez, índice de p-anisidina, k270, k232 y contenido en compuestos polares.