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A positively charged tetraphenylethene (TPE) derivative, TPE-4MN, was synthesized as a probe for heparin based on aggregation induced emission. On the addition of 5.0 μg/mL of heparin, TPE-4MN showed an enhanced emission of about 10-fold. The change in fluorescence at 475 nm was linear over a range of heparin concentrations of 0–1.0 μg/mL with an R = 0.99988 and the limit of detection (LOD) was calculated...
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