Isolation of acidic glycopeptides from urine by means of anion-exchange resins. Application to some cases of glycosphingolipidosis or mucolipidosis

Characteristics of the interactions between acid glycosaminoglycans and proteins in normal human plasma as revealed by the behaviour of the protein-polysaccharide complexes in ultrafiltration and chromatographic procedures

Acid glycosaminoglycans were isolated from normal human plasma: (a) following fractionation of plasma (with protease inhibitors) on Sephadex G-200; (b) by ultrafiltration through membranes with retention of molecules above 50 kDa, with and without previous addition of NaCl, Triton X-100, urea, or guanidine HCl; (c) by filtering on Ecteola-cellulose either untreated plasma or after treatment with NaCl, urea, Triton X-100, papain or NaOH. More than 95% of plasma glycosaminoglycans interact with plasma proteins to give complexes that exhibit reproducible behaviour on Sephadex G-200 and are retained by ultrafiltration membranes, which the 12-20 kDa polysaccharide chains do filter. High charge plasma glycosaminoglycans show ionic interactions with proteins, while low charge glycosaminoglycan interactions are resistant to Ecteola charged groups, to 0.5% Triton and 4 M urea, while not to 4 M guanidine HC1. Some glycosaminoglycan-protein complexes appear resistant to proteolysis, suggesting that they may originate from lymphocytes. The simple method utilized for plasma GAG measurement may represent an useful tool in clinical practice.

Chapter 12 Compound Biopolymers and Biooligomers

This chapter is devoted to the separation of simple saccharides. In this chapter, the rapid chromatographic separation of natural oligomeric or polymeric compounds containing important molecular moieties of a different type are discussed, such as nucleoprotein complexes, glycolipids, glycopeptides and glycoside oligomeric derivatives. In addition, separations of several natural complex substances that are not well known are discussed. This chapter concludes with a brief discussion on the separation techniques used for the miscellaneous polymeric and oligomeric substances.