3.3 Effect of Molecular Weight
The antiviral activity shown by the different heparins appeared to correlate broadly with their molecular weight. Overall UFHs with the highest molecular weights ranging between 12,500 – 16,300 Da were more potent inhibitors of SARS-CoV-2 than low molecular weight heparins ranging between 4230 - 6,630 Da. Of the LMWHs the brand with highest molecular weight Innohep (6,630 Da) had the highest antiviral effect whereas Clexane (lowest molecular weight, 4,230 Da) had the weakest antiviral effects.