I. Molecular formula: CH3COONa.3H2O
Physical and chemical properties: colorless and odorless crystal, weathering, flammable in air. Soluble in water, slightly soluble in ethanol, insoluble in ether. Crystal water is lost at 123℃. But usually the wet method has the taste of acetic acid. Hydrolysis occurs in water. It is alkaline.
Industrial uses: used as esterifying agent for organic synthesis, mordant for photography and medicine, medicine, printing and dyeing, buffer, chemical reagent, meat preservation, pigment, tanning and many other aspects. It can be used to prepare various chemical products, such as furan acrylic acid, acetate, chloroacetic acid, etc. As a buffer for seasoning, this product can reduce bad smell, prevent discoloration and have certain mildew-proof effect. It can also be used as sour agent for soy sauce, pickles, mayonnaise, fish cake, sausage, bread, sticky cake and so on. Mix with methyl cellulose, phosphate, etc. Used to improve the preservation of sausages, bread, sticky cakes, etc.
Used as buffer, flavoring agent, flavoring agent and ph regulator. As a buffer of flavoring agent, 0. 1% ~ 0.3% can be used to reduce bad smell, prevent discoloration and improve flavor. It has certain mildew-proof effect, such as using 0. 1% ~ 0.3% in surimi products and bread.
Four, 5% acetic acid dyeing experiment
5% acetic acid solution can make the nuclear protein and cytokeratin of cervical epithelial cells reversibly coagulate, showing temporary turbidity. The higher the content of nucleic acid protein in epithelial cells, the more cell layers and the thicker the white coagulum, which is called acetate white epithelium. Normal squamous epithelial cells have small nuclei and few nuclear proteins, and rarely coagulate with acetic acid staining, showing pink color; The columnar epithelium is a single layer with a slightly larger nucleus and relatively rich nuclear proteins. After acetic acid staining, columnar epithelium quickly turned white and opaque, and disappeared in 30-60 s. Normal phosphorus-like epithelium has little change because of the small amount of nucleic acid protein in cells.