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Wheat oil, rice bran oil, soybean oil and castor oil, which has a lower iodine value?
The iodine value of castor oil is lower than that of wheat oil, rice bran oil and soybean oil.

Iodine value (iodine value; Iodine value) is an index of unsaturation in organic compounds. Refers to the number of grams of iodine that can be absorbed (added) in 100g. Mainly used for the determination of oil, fatty acid, wax and polyester. The greater the degree of unsaturation, the higher the iodine value.

Iodine value of wheat oil: 1 15 ~ 129, rice bran oil: 98 ~ 1 10, soybean oil:120 ~14. So the lowest iodine value is castor oil.