The present invention relates to a composition comprising vegetable oil, caramel and one or more phenolic compounds. The caramel and one or more phenolic compounds together prevent oxidation of the vegetable oil, such that the amount of EDTA in the composition can be reduced. The caramel has been heated such that it does not impart a dark colour to the composition. The invention also relates to a method to prepare the composition. Finally the invention relates to use of caramel and one or more phenolic compounds to decrease the oxidation of vegetable oil.

[Object] The present invention provides an oil composition in which oxidation of oil is inhibited and a method of inhibiting oxidation of oil.

[Solving Means] Provided is an oil composition containing oil, an ionic surfactant, and a polyhydric alcohol, in which a value L2-L1 calculated by the following method is positive. Value L1: a value of lightness of the oil composition Value L2: a value of lightness of an emulsified product obtained by adding 100 mass times of fresh water to the oil composition

The present invention is directed to processes for preparing oil compositions having a high concentration of poly-unsaturated fatty acids and oil compositions having a low concentration of -linolenic acid. In addition, the present invention is directed to processes for preparing oil compositions having advantageous stability characteristics.

Provided is a method of manufacturing a microbially produced plastic having low coloration, good tone, and low odor, based on a simple, low-cost method that is suitable for industrial production. The method of manufacturing the microbially produced plastic is characterized in that a step (a) and a step (b), described below, are included: step (a) is a step of applying heat treatment to fat containing hydrogen peroxide, and step (b) is a step of culturing microbes in a culturing liquid containing the fat that has been subjected to the heat treatment in the step (a).