Disaccharide, also known as disaccharide, is formed by two monosaccharide molecules through glycosidic bonds. When the reducing group of a monosaccharide is combined with the alcohol hydroxyl group of another saccharide, disaccharide shows the same chemical properties as monosaccharide, such as reduction in Feyning solution, optical rotation change and cantharis formation, while monosaccharide combined by reducing group has no such properties (such as sucrose and trehalose).

China exported China white sugar to Japan, India and Nanyang Islands from the Ming Dynasty.

China's white sugar was exported to Bengal in the Ming Dynasty, which also spread the method of making white sugar in China. According to Ji Xianlin's research, in Bengali and several Indian languages, white sugar is called cini sakara, that is, "China sugar", which is the proof that China sugar was introduced to India.

The merchant ship of the British East India Company bought 13028 tons of white sugar and 500 tons of rock sugar around Guangzhou in the tenth year of Chongzhen in the Ming Dynasty.

Reference to the above content: Baidu Encyclopedia-Sucrose