Polysaccharide aldehydes are prepared using selective oxidation involving the use of nitroxyl radical mediated aqueous oxidation with a limited amount of oxidant and defined reaction conditions. These polysaccharide aldehyde derivatives having maximum effective aldehyde and minimal carboxylic acid levels making them especially useful as wet, temporary wet and dry strength additives for paper.

 
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> Leukocyte depletion filter media, filter produced therefrom, method of making same and method of using same

> Polymers containing polysaccharides such as alginates or modified alginates

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