Biochemicals

Total acetyl sugar generally refers to sugar derivatives in which all free hydroxyl (- OH) or amino (- NH2) in sugar molecules are protected by acetyl (- AC). Such molecules are an important synthetic intermediate in organic synthesis. Total acetyl sugar refers to sugar derivatives in which all free hydroxyl (- OH) or amino (- NH2) in sugar molecules are protected by acetyl (- AC). For example, 1,2,3,4,6-o-pentaacetyl-d-glucopyranose (galactose, mannose) is common in the laboratory. It is widely used in many fields, such as sugar biology, sugar chemistry, synthetic chemistry, pharmaceutical chemistry, material science, physical chemistry and so on. For example, diacetyl glucose is a potential surfactant; In the synthesis of sugar molecules as raw materials, the preparation of total acetyl sugar is often the first step to protect the exposed hydroxyl groups, which is of great significance for the follow-up reaction. Due to the wide application of total acetyl sugar in chemical experiments, the reagents such as total acetyl glucose, mannose and lactose prepared by the factory can be ordered directly on the market. However, for less experimental dosage, it is common to use the original sugar molecules to prepare acetyl sugar temporarily in the laboratory. At the same time, the total acetylation of monosaccharides such as glucose involves the preparation of chiral compounds, the application of thermodynamic and kinetic control theory, the influence of sugar end group effect on the product configuration, the influence of different catalysts on the product configuration ratio, as well as the basic experimental operations such as vacuum filtration, extraction and recrystallization. Therefore, learning to prepare total acetylsaccharides is of great significance for understanding the organic reaction mechanism and training the basic operations, It can be used as a good teaching content of College organic chemistry experiment course.

Yeast is a unicellular fungus and is not a module of phylogenetic classification. A microscopic single-celled microbial strain that cannot be seen by the human eye. It can convert sugar ethanol into ethanol and carbon dioxide, and it is distributed in all nature. It is a typical heterotrophic and facultative anaerobic microbial strain. It can survive under anaerobic standards and is a pure natural starter.

1,4-dioxane-2,5-hexanedione is a cyclic ester formed by dehydration of two molecules of glycolic acid. It is a monomer used to prepare polyglycolic acid (PGA). 1,4-dioxane-2,5-hexanedione is a cyclic ester formed by dehydration of two molecules of glycolic acid, which can be used as an intermediate in organic synthesis.

Microbial metabolites.