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Efficient, Baseline Separation of Pyrethrins by Centrifugal Partition Chromatography

This was presented at Prep 2017 in Philadelphia on July 17th, 2017.AbstractPyrethrins are natural pesticides present in the oil extracted from the flowers of Chrysanthemum cinerariaefolium. These six structurally related esters are potent neurotoxins that interfere with sodium channels in neurons of insects. With low toxicity to mammals and an exceptionally safe environmental profile, there is an ... READ MORE

Efficient, Baseline Separation of Pyrethrins by Centrifugal Partition Chromatography

Congratulations to our former employee Alan Wong on the hard work and R&D he invested in developing this method and getting it published. Abstract Pyrethrins are natural pesticides present in the oil extracted from the flowers of Chrysanthemum cinerariaefolium. They are potent ion-channel neurotoxins which have higher selective toxicity for insects compared to mammals. These phytochemicals hav... READ MORE

Efficient, Baseline Separation of Pyrethrins by Centrifugal Partition Chromatography

AbstractPyrethrins are natural pesticides present in the oil extracted from the flowers of Chrysanthemum cinerariaefolium. They are potent ion-channel neurotoxins which have higher selective toxicity for insects compared to mammals. These phytochemicals have an exceptionally safe environmental profile and are an attractive natural alternative to organophosphate insecticides currently used in agric... READ MORE

Trimeric and Tetrameric A‑Type Procyanidins from Peanut Skins

AbstractPeanut skins are a rich source of oligomeric and polymeric procyanidins. The oligomeric fractions are dominated by dimers, trimers, and tetramers. A multistep chromatographic fractionation led to the isolation of four new A-type procyanidins of tri- and tetrameric structures. The structures of the new trimers were defined by NMR, electronic circular dichroism, and MS data as epicatechin-(... READ MORE

Influence of Degree-of-Polymerization and Linkage on the Quantification of Proanthocyanidins using 4‑Dimethylaminocinnamaldehyde (DMAC) Assay

AbstractProanthocyanidins (PACs) are naturally occurring flavonoids possessing health beneficial bioactivities. Their quantification often utilizes the 4-dimethylaminocinnamaldehyde (DMAC) spectrophotometric assay with the assumption that molar absorption coefficients (MACs) are similar across the various PAC species. To assess the validity of this assumption, individual PAC monomers and oligom... READ MORE

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