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refrigerated showcase supermarket refrigerated showcase explains the characteristics of food ingredients (4)
author: supermarket refrigerated showcase category: walk-in display coolers Views: 955Time: 2016-08-22
refrigerated showcase supermarket refrigerated showcase explains the characteristics of food ingredients (4)
lipids and enzymes
lipids are also an important part of food refrigerated showcase.
Any biological material that can be extracted with low-polarity solvents is called lipid. Lipids are divided into two categories: true lipids and lipids.
true fat is a glyceride of various higher fatty acids, that is, fat. The types of higher fatty acids that make up glycerides are more complex. Most of these higher fatty acids contain even-numbered carbon atoms and do not have side chains. They are saturated and unsaturated. The most important of which is palmitic acid [CH3一(CH2)14一COOH], stearic acid [CH3-(CH2) 6-COOH] and oleic acid [CH3-(CH2) 7-CH-CH-(CH) 7] and so on.
lipids include phospholipids, sterol lipids, waxes and so on. Lipids are the most variable in general ingredients. According to chemical analysis, the variation between species is between 0.2-64, with the lowest content and the highest content, the actual difference is as much as 320 times. And even if it is the same species, the content varies greatly depending on age, physiological state, nutritional conditions, etc.
enzyme
enzyme is a special catalytic protein produced by living cells, so it is called a biocatalyst. It is still active after being separated from living cells. Enzymatic reaction is one of the important reasons for food spoilage.
(一)Enzyme performance
1. Enzymes are biocatalysts. Enzymes are biocatalysts produced by living cells that use protein as the main component. It can catalyze various biochemical reactions.
2. Enzymes have high catalytic efficiency. The catalytic efficiency of enzymes is generally 106-1013 times that of inorganic catalysts. Taking the decomposition of hydrogen peroxide into water and oxygen as an example, 1mol/L catalase can catalyze 5× under certain conditions; 10mol hydrogen peroxide decomposes into water and oxygen, and under the same conditions, every 1g of ion iron can only catalyze hydrolysis 6× 104mol, the catalytic efficiency of catalase is 1010 times that of iron ions.
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