[Study of various heparin salts]

Area of Science:

• Biochemistry
• Polymer Chemistry
• Spectroscopy

Background:

• Heparin is a complex polysaccharide with anticoagulant properties.
• Understanding the structural variations in heparin is crucial for its therapeutic applications.
• Heparin's structure, including its degree of sulfation, influences its biological activity.

Purpose of the Study:

• To devise methods for preparing acid and neutral sodium (Na+), potassium (K+), calcium (Ca2+), and magnesium (Mg2+) salts of individual heparin fractions.
• To analyze the structural characteristics of these heparin salts using infrared spectroscopy.
• To investigate the influence of cation nature and the degree of sulfation on the properties of heparin salts.

Main Methods:

• Preparation of acid and neutral Na+, K+, Ca2+, and Mg2+ salts of specific heparin fractions.
• Characterization of heparin fractions based on the number of sulfate groups per dimer (HP = 3 and HP = 4).
• Acquisition and analysis of infrared (IR) spectra of the prepared heparin salts.

Main Results:

• Successful preparation of various heparin salt forms.
• Identification of heparin fractions with 3 (HP = 3) and 4 (HP = 4) sulfate groups per dimer.
• Demonstration that acid salts of HP = 3 (except Mg2+ salt) and HP = 4 form intermolecular hydrogen bonds.
• Observation that the cation type significantly impacts the infrared spectral structure of HP = 3 and HP = 4 heparin salts.

Conclusions:

• The cation significantly influences the structural characteristics of heparin salts, as revealed by infrared spectroscopy.
• The degree of sulfation and cation type are key factors determining intermolecular hydrogen bonding in heparin salts.
• The developed methods allow for the preparation and analysis of distinct heparin salt structures, aiding in understanding structure-activity relationships.