White sugar is made from sugarcane and sugar beet by juicing, filtering, impurity removal, clarification, vacuum concentration and crystallization, honey removal, sugar washing and drying. The reason why sugar is white is because impurities are removed during processing and decolored with sulfur dioxide, so sugar looks so white.
Brown sugar refers to the finished sugar of sugar cane and honey, which is made by squeezing and concentrating sugar cane. Brown sugar is divided into flake sugar, brown sugar powder and bowl sugar. According to the different crystal particles, it not only has the function of sugar, but also contains vitamins and trace elements, such as iron, zinc, manganese and chromium. Its nutrient content is much higher than that of white sugar.
The raw material of yellow sugar is sugarcane, which contains about 95% sucrose. The traditional method is to chop and crush the harvested sugarcane to remove impurities such as soil, bacteria, fiber, etc. from the juice, and then cook for 5-6 hours with low fire, and stir constantly to make the water slowly evaporate, so that the sugar concentration gradually increases. After cooling, the high-concentration syrup will solidify into a solid block of coarse sugar, that is, a yellow sugar brick.
Brown sugar is a kind of sucrose that is not highly refined and shaped with honey, also known as brown sugar and purple sugar. It is a red crystal, extracted from the stem of sugarcane, a Gramineae plant, and rich in sugar, minerals and glycolic acid. Brown sugar, dark in color and burnt. Brown sugar contains unique natural acids and pigment regulating substances, which can effectively regulate various pigment metabolism processes, balance pigment secretion and distribution in the skin, and reduce abnormal accumulation of local pigments.
Extended data:
Carbohydrate is polyhydroxy aldehyde or ketone, which can be divided into aldose and ketose.
Sugar can also be divided into triose, special sugar, pentose and hexose according to the number of carbon atoms. The simplest sugar is triose (glyceraldehyde and dihydroxyacetone). Because most carbohydrates can be represented by the general formula Cn (H2O)n, people used to think that sugar is a compound of carbon and water, which is called carbohydrate. It is found that some sugars, such as rhamnose (C6H 12O5) and deoxyribose (C5H 10O4), do not conform to the general formula of carbohydrates. In addition, the ratio of the number of hydrogen atoms to oxygen atoms in some organic compounds is exactly 2: 1, such as formaldehyde (CH2O) and acetic acid (C2H4O2), which conforms to the definition of carbohydrate, but not sugar. Therefore, it is inappropriate to call sugar carbohydrate, but it has been used for a long time and is still used by people today.
Baidu Encyclopedia: Sugar