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| Effect of relative humidity on oxidation rancidity of soybean blend oil |
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| KeyWord:soybean blend oil relative humidity oxidation rancidity peroxide value acid value rate constant |
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| Abstract: |
| The effect of relative humidity (RH) on oxidation rancidity of soybean blend oil (BSO) was studied. Controlling RH to 50%, 60%, 70%, 80% and 90% respectively with hydrogen dipotassium phosphate solution, BSO was oxidized in self-assembling oxidation device under the conditions of temperature 50?℃, atmospheric oxygen partial pressure (21 kPa), initial headspace rate 50% and light intensity 840 lx. The peroxide value (POV) and acid value (AV) of BSO were determined at different oxidation time (t), and the effect of RH on oxidation rancidity of BSO was analyzed by POV-t regression curve and AV-t regression curve. The results showed that oxidation rancidity of BSO was in accordance with kinetic characteristics of zero order reaction, POV and AV increased with the increase of RH and the prolonging of t, and the reaction rate constant (k) increased with the increase of RH. The higher the RH, the faster the oxidation rancidity rate, both conformed to binomial equation of kPOV=-1E-05 RH2+0.002 4 RH-0.049 6 and kAV=2E-07 RH2-2E-05 RH+0.000 5. So,the storage environment humidity would be reduced as far as possible to slow down the rate of oxidation rancidity of BSO in the process of production, storage, transportation and consumption. |
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