For certain processed foods rich in oil, such as fried potato chips, which have a large surface area and are prone to oxidation and spoilage, the order of antioxidant capacity is: TBHQ>PG>BHT>BHA.For example, soybean oil, which contains a large amount of polyunsaturated fatty acids and is composed of glycerol vinegar (52% linoleic acid, 8% linolenic acid), is prone to oxidation and deterioration under the action of light, heat, and air. The order of antioxidant activity in soybean oil is TBHQ>Vc>VE>catechins>BHT.It can be added before and after the deodorization process of oil. Citric acid dehydrates when the heating temperature exceeds 110 ℃, so it is advisable to add it after the deodorization is completed.

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When citric acid is combined with antioxidants, the higher the content of these impurities in the oil, the more obvious the synergistic effect. TBHQ has good oil solubility and thermal stability, and does not change in color after heating.After degumming, deacidification, decolorization, and deodorization, edible vegetable oil becomes a high-purity high-grade cooking oil or salad oil, while also losing some natural antioxidant substances, making it prone to oxidation and deterioration. 


According to research, when fish oil is stored at room temperature without the addition of TBHQ, the time to reach the hygiene limit for fish oil peroxide value (POV) is 13 days, while the time to reach this value after the addition of TBHQ is about 80 days. Whether at 60 ℃ or room temperature, the order of antioxidant ability to fish oil is TBHQ>BHA>BHT>PG. Adding citric acid has a certain synergistic effect on TBHQ antioxidant activity.

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When comparing the antioxidant effects of TBHQ and tea polyphenols on fish oil, it was found that although tea polyphenols also have good antioxidant effects on fish oil, adding TBHQ has a better effect and is more conducive to fish oil storage at low temperatures. Due to the fact that tea polyphenols are natural antioxidants, antioxidants can be selected according to different needs.

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