P polysaccharides Polysaccharides containing a single sugar, such as glucose, are referred to as glucans. Others, which contain only mannose, are called mannans. Still others containing only xylose, are called xylans Another group of polysaccharides of importance is the glycosaminoglycans. These are heteropolysaccharides containing either N-acetylgalactosamine or N- acetylglucosamine as one of their monomeric units. Examples include chondroitin sulfates and keratan sulfates of connective tissue, dermatan sulfates of skin and yaluronic acid. All of these are acidic, through the presence of either sulfate or carboxylate groups.Polysaccharides • Polysaccharides containing a single sugar, such as glucose, are referred to as glucans. Others, which contain only mannose, are called mannans. Still others, containing only xylose, are called xylans. • Another group of polysaccharides of importance is the glycosaminoglycans. These are heteropolysaccharides containing either N-acetylgalactosamine or N￾acetylglucosamine as one of their monomeric units. Examples include chondroitin sulfates and keratan sulfates of connective tissue, dermatan sulfates of skin, and yaluronic acid. All of these are acidic, through the presence of either sulfate or carboxylate groups