Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Galactose is a type of sugar that is less sweet than glucose. It is considered a nutritive sweetener because it has food energy. Its name comes from the Ancient Greek word for milk. It is an epimer of glucose. Galactan is a polymer of the sugar galactose. It is found in hemicellulose and can be converted to galactose by hydrolysis. Galactose solubility in water is 68.30 grams per 100 grams of water at 20–25°C. Galactose exists in both open- chain and cyclic form. The open-chain form has a carbonyl at the end of the chain. Four isomers are cyclic, two of them with a pyranose ring, two with a furanose ring. Galactofuranose occurs in bacteria, fungi and protozoa

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