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Recent work on the ground substance of connective tissue has stressed the importance of mucopolysaccharide components which contain glucuronate such as hyaluronate and chondroitin sulfate. In different tissues these polysaccharides appear to vary widely in degree of polymerization and in relative quantity (1-3). Little is known about the catabolism of the ground substance polysaccharides and their possible elimination through blood and urine. The total polysaccharide content of plasma has frequently been studied and found to contain mannose, galactose, fucose, and glucosamine (47). In human plasma the polysaccharides are contained mainly in the globulins (8). Albumin normally contains much less (9). Of the total polysaccharide about 10 per cent is in the mucoprotein fraction and is not precipitated by high concentration of ethanol or by 6 per cent perchloric acid (10-13). In these studies no significant amount of hexuronate has been found in any plasma polysaccharide fraction, perhaps due to the unreliability of uronic acid determination in the presence of large amounts of protein, and the drastic methods of protein hydrolysis used. The glucuronate of tungstic acid treated plasma filtrates (14) is not part of a polysaccharide. The only report of glucuronate bound to serum proteins is that of Stary and Yuvanidis (15). They precipitated serum proteins with trichloracetic acid, hydrolyzed them by boiling four hours in concentrated HQand used Tollens'

PLASMA POLYSACCHARIDE FRACTION CONTAINING URONIC ACID, IN NORMAL SUBJECTS AND IN PATIENTS WITH RHEUMATOID ARTHRITIS 1