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1.
Definition and type of color retention agent
Color retention agent refers to a type of food additive that does not have color itself, but can interact with certain ingredients in food to stabilize or improve the color of food (such as strengthening or protecting)
.
Color retention agent is also called color developing agent or color former
Allows the use of color protection agents are sodium nitrate , potassium nitrate , sodium nitrite , potassium nitrite , and erythorbic acid and its sodium salt and the like
.
Nitrate and nitrite are mainly used in animal foods, and erythorbic acid and its sodium salt are mostly used in fruit and vegetable products
.
Second, the principle of the color protectant
Take sodium nitrite as an example
.
Adding sodium nitrite as a color retention agent during the processing of meat products will produce free nitrous acid under acidic conditions and further decompose to produce nitroso groups
Sodium nitrite is not only a good coloring agent, but also has a good antiseptic effect (especially has a special inhibitory effect on Clostridium botulinum) and enhances the flavor of meat products
.
However, as a food additive, excessive use of sodium nitrite will have a toxic effect on the human body.
The combination of multiple effects of sodium nitrite makes it difficult to find other substitutes
.
Therefore, all countries can only strictly control the use under the premise of ensuring safety and product quality
Third, the determination method of color retention agent
The determination of nitrite includes national standard methods such as naphthalene ethylenediamine hydrochloride colorimetry and oscillopolarography; the national standard method for nitrate determination is the cadmium column method, that is, the nitrate is first reduced to nitrite, and then press The method of measuring nitrite is measured
