Abstract

Mature and immature soybeans were stored for 6 months. Every month, soybeans were analysed for oil content, moisture percentage, acid value, peroxide value, fatty acid analysis, meal protein and urease activity in soybean meal. In addition, soybean samples were heated to different temperatures and times and the effect of heating on dehulling was studied. Finally control charts of acid and peroxide values were constructed and discussed.

Highlights

  • High humidity is a major problem for soybeans with high temperatures, these conditions are conductive to mould growth on soybeans

  • It is clear that the oil content of the six samples ranges from 20.1 to 24.0 and this means that there is a little bit differences

  • During storage the peroxide value of produced oil increased through the 6 months and acheived more than double value

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Summary

Introduction

High humidity is a major problem for soybeans with high temperatures, these conditions are conductive to mould growth on soybeans. Prolonged wet and dry weather has damaged large quantity of soybeans. When the damaged soybeans were placed in storage at high moisture levels, the damaged become progressively more severe. The recommended soybean moisture for harvest is 13% [1, 9, 10, 11, 14], in actual practice, soybeans are harvested between 13-18% [12]. Soybeans harvested at higher moisture levels should be dried to 13% or less for storage [2, 3, 12]. When soybeans are stored for about 2 years, a moisture of 12% is recommended to maintain a good seed grade. The effect of dehulling methods on the composition of oil and water absorption, emulsification and foaming properties of the flour was investigated [6]

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