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, Neu5Gc and their O-Acetylated derivatives were quantified by DMB-HPLC in native porcine aortic valve cusp (A), pulmonary valve cusp (B), and pericardium (C), and bovine pericardium (D). 2 ?l of tissue homogenates were acid hydrolyzed to release Sia followed by DMB-labeling and HPLC analysis. Sia content was quantified according to a standard curve of purified Neu5Ac. Percentage of each Sia from the total detected is indicated on the charts. All detected O-Acetylation types were summarized, Quantitative analysis of sialic acids in xenogenic cardiac tissues by DMB-HPLC. Neu5Ac
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