Oil Test Strips

The average person may not understand what Acid value (AV) is.Acid value is used to measure the free acid content in oil, usually measured by the amount of potassium hydroxide (KOH) required to consume the acid in one gram of oil.According to general international standards, the acid value of fine refined oils is less than 0.2 mg KOH/gram.Acid value detection is an indicator to check the freshness of oil products. The acid value of fresh oil tends to zero, but the oil gradually deteriorates after repeated use or long-term contact with the air after opening or storage for too long. If the acid value exceeds 2.0, the oil deteriorates.

Another term related to edible oil is "smoke point", which is the temperature at which the thin smoke rises when the oil is heated, and is usually used as an indicator of the system and freshness of the oil.Edible oil when frying food, the temperature is too high (over the smoke point) or repeatedly frying (return pot oil), oil will be oxidized and deteriorated and harm human health.Therefore, this is to remind the public, cooking oil whether fried or fried, when there is a thin smoke, that is, should reduce the heating temperature, so as not to overheat the temperature of oil, oil cracking deterioration, resulting in too much smoke and harm to the body.Therefore, for frying oil, smoke point should be selected more than 190℃ ~ 200℃ more appropriate, but repeated use of oil will make smoke point drop, so the public should avoid repeated use of used oil to fry food.Remind the public that when the quality of fried oil reaches any of the following conditions, it indicates that the oil has deteriorated to the point that it is no longer usable and should be completely renewed:

(a) when the smoke point temperature is lower than 170 degrees Celsius (i.e., frying oil is already smoking at low temperature).

(2) deep-fried oil that is dark and sticky, foamy, smelly and has more than half of the foam area of the deep fryer.

(3) when the acid value exceeds 2.0.(It is recommended to buy oil test paper test).

Here also appeals to the public in the selection of oil, should pay attention to the following:

(1) Do not buy oil in bulk or from unknown sources.

(2) Do not reuse or stale oil.

(3) Reduce the cooking method of high temperature stir-fry or fried food.

(4) Smoke exhaust machine should be used when cooking.

(5) When frying food in large quantities, animal fat or shortening should be used, while vegetable fat is not suitable.