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A well known rule of high thermal stability of GC-rich DNA helices can be reversed with the use of certain ions, rendering AT-rich duplexes more stable. We have sought to elucidate the structural basis of this phenomenon for choline dihydrogen phosphate, an ionic liquid known for extension of long-term chemical stability of biomolecules. NMR experiments complemented with CD spectroscopy revealed subtle...
Cepaic acid was isolated as a novel xanthylium yellow pigment from the dried outer scales of the yellow onion Allium cepa Linne. Its structure was elucidated on the basis of ESI-MS and 2D NMR spectroscopy as a 9-carboxy-1,3,6,8-tetrahydroxyxanthylium, which suggests that cepaic acid and other yellow pigments in the dried outer skin of onion were formed by the nucleophilic reaction of phloroglucinol...
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