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Potassium sorbate, also known as potassium 2,4-hexadienoate, is the potassium salt of sorbic acid, and its molecular formula is C6H7O2K. White to light yellow scale-like crystals, crystal particles or crystal powder, odorless or slightly odorous, easy to absorb moisture when exposed to air for a long time, oxidative decomposition and discoloration.

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Calcium propionate is an acid-type food preservative. Under acidic conditions, it produces free propionic acid, which has antibacterial effect. Its antibacterial effect is affected by the pH value of the environment, and the inhibitory effect on mold is the best when the pH value is 5.0.

Amino acid additives in aquatic feed mainly refer to limiting amino acids that cannot be synthesized by aquatic animals, namely lysine and methionine. The lack of limiting amino acids in aquatic feed often occurs when a large amount of plant protein feed is used.