Some people think that eating moon cakes and sending moon cakes have been related to the Mid-Autumn Festival since ancient times. In fact, this is not the case.
In the early Tang Dynasty, only the first lunar month of the lunar calendar was a festival in August and there was no fifteenth festival. According to legend, after Tang Minghuang had toured the moon palace on August 15th, so the people only used August 15 as the Mid-Autumn Festival.
In the Middle Tang Dynasty, people began to watch the building on the night of August 15. There was no moon cake at that time.
When it comes to the appearance of moon cakes, it was the earliest time in the Southern Song Dynasty. However, mooncakes at that time had nothing to do with the Mid-Autumn Festival. Moon cakes at that time were very different from modern moon cakes. They only appeared as steamed food in the food market.
The moon cake is really related to the Mid-Autumn Festival in the Ming Dynasty. At that time, there was a kind of moon cake filled with fruit in the city of Beijing. On the day of the Mid-Autumn Festival, people made their own moon cakes for self-catering and gifts to friends and relatives to express their feelings of reunion and congratulations.
The size and shape of moon cakes at that time were very irregular, and the differences were very large. Their names were also quite special. For example, on the day of the Mid-Autumn Festival in the vicinity of Jiexiu County in Shanxi Province, the local people have already shared the custom of eating mooncakes with food groups. The moon cakes they make are numerous and interesting. For example, there are crescent moon cakes exclusively for men, gourd moon cakes only for women, and mooncakes such as “Sun Wukong†and “Rainer Yeâ€. There are many different names.
The technology for making moon cakes has reached a very high level in the Ming Dynasty. At that time, some moon cakes had been decorated with decorative patterns. Its excellent design, the wonderful composition, the fine spirit of the pattern, and people's enjoyment of art, fully embody the ingenuity of moon cake makers, and also reflect the splendid culture of our great Chinese nation.
Vitamins are a kind of trace organic substances that humans and animals must obtain from food in order to maintain normal physiological functions. They play an important role in the growth, metabolism, and development of the human body. In the body, this kind of substance can neither be a raw material for body tissue nor a source of energy, but a kind of regulating substance, which plays an important role in material metabolism.
From the point of view of chemical structure, various vitamins are very different or even unrelated. Therefore, vitamins are usually classified according to their physical properties. They can be divided into fat-soluble vitamins (such as vitamin A, D, E, K, etc.) and water-soluble vitamins ( Such as vitamin C, vitamin B1, B2, B6, B12, pantothenic acid, PP, biotin, folic acid, choline, etc.). Water-soluble vitamins are easily soluble in water but not soluble in organic solvents. They are stored in the body after absorption. Excessive amounts are mostly eliminated in the urine; fat-soluble vitamins are easily soluble in organic solvents but not in water. They can be absorbed by the body with fat and stored in the body, and the excretion rate is not high.
From the perspective of obtaining methods, vitamins can be divided into natural products and chemical synthetic products. Because natural vitamins are limited by raw materials and extraction technology, their yields are low, and their prices are high. Therefore, chemical synthesis takes the lead, accounting for about 80% of the total vitamin output. Among the various segments of the vitamin industry, vitamin B, vitamin E, vitamin C and vitamin A have the largest market shares, 33%, 30%, 21% and 13% respectively. Other vitamins have a smaller market share, accounting for only 3%.
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