Soybean oil quality from grains stored under different conditions.

The influence of different storage conditions of soybean grains in the quality of the extracted oil was assessed. The soybean grains were harvested with moisture content around 18% and dried until 11.2, 12.8 and 14.8 % moisture content. The grains were subsequently stored at the following conditions of temperature and relative humidity for 11.2 % m.c.: 20 oC and 61.7 %; 30 oC and 67.9 %; 40 oC and 69.4 %; for 12.8 % m.c.: 20 oC and 73.7 %, 30 oC and 76.7 % and 40 oC and 80.8 %; and for grains with 14.8 % m.c.: 20 oC and 82.7 %, 30 oC and 83.9 % and 40 oC and 85.3 %. Sampling was carried out every 45 days until 180 days of storage and the level of lipids and free fatty acids, besides the index of iodine and peroxide were determined. Despite of no change of iodine index taking place, the other parameters assessed in the extracted oil showed significant change during storage. Nonetheless, only the oil extract from soybean grains stored with initial moisture content of 12.8 % at 40 oC and with 14.8 % at 30 and 40 oC surpassed the threshold values established for marketing the oil.

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