Changes in contents of proteins, antinutritive substances and fatty acids in soya bean grain and full-fat meal under storage conditions | Promene sadrzaja proteina, antihranljivih materija i masnih kiselina u sojinom zrnu i punomasnom brasnu pod uticajem uslova cuvanja
2010
Zilic, S., Institut za kukuruz Zemun Polje, Beograd - Zemun (Serbia) | Bozovic, I., Institut za kukuruz Zemun Polje, Beograd - Zemun (Serbia) | Sobajic, S., Farmaceutski fakultet, Beograd (Serbia) | Kovcin, S., Poljoprivredni fakultet, Novi Sad (Serbia) | Peric, V., Institut za kukuruz Zemun Polje, Beograd - Zemun (Serbia)
Grain and meal of the soybean cultivars Goyou Kurakake and L93-7290 were analysed after five-month storage in PVC bags at the temperatures of 25 deg C and -20 deg C. The statistically significant decrease in contents of water soluble proteins, available lysine, trypsin inhibitor and activities of urease and lipoxygenase occurred five months after storage. The lowest content of the albumin fraction was recorded after grain storage at 25 deg C. This content was reduced by 18.5%, i.e. 21.1% in grain of cultivars Goyou Kurakake, i.e. L93-7290, respectively. In relation to trypsin inhibitor, storage conditions much more affected changes in urease activities in soya bean meal. The lypoxygenase 1 activity amounted to 6.89 micromol/ml per min in the grain of the cultivar Goyou Kurakake and this activity was reduced by 28.2% during the storage period. On the other hand, this activity amounted 11.89 micromol/ml per min in the grain of the cultivar L93-7290, while the activity drop was 26.6%. After storage of full-fat meal of both cultivars, the lipoxygenase 1 activity was also statistically significantly reduced. During the five-month storage of soya bean oil, primarily of the cultivar L93-7290, a high stability to atmospheric oxidation was observed in oil. This oxidation was much more pronounced than in soya bean meal. The linolenic acid content in L93-7290 cultivar meal was lower by 27.3% than in the control storage at 25 deg C.
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