Cyclopeptides have been investigated phytochemically less often because until now there has not been a special chemical method to detect them. Since we found cyclopeptides in Pseudostellaria heterophylla (Caryophyllac...Cyclopeptides have been investigated phytochemically less often because until now there has not been a special chemical method to detect them. Since we found cyclopeptides in Pseudostellaria heterophylla (Caryophyllaceae) in 1991, we have gradually established a special chemical detection method for detecting cyclopeptides in plants, which induces a new thin layer chromatography (TLC) protosite reaction with ninhydrin reagent. With this method, our group isolated and determined 73 cyclopeptides from 17 plants which belong to 5 families and 14 genuses, they are from dicyclopeptides to undecacyclopeptides, including 68 new ones, and were determined based on spectral, chemical and enzymic methods, especially 2D NMR and FAB-MS. Meantime, with this method cyclopeptides can be distinguished from peptidic amides based on their behaviour in TLC.展开更多
Iodine, Dragendorff's reagent, ninhydrin and Coomassie brilliant blue G-250 reagents were used to detect cyclotides from proteins, cyclopeptides, linear-peptides and amino acids in the thin layer chromatography (T...Iodine, Dragendorff's reagent, ninhydrin and Coomassie brilliant blue G-250 reagents were used to detect cyclotides from proteins, cyclopeptides, linear-peptides and amino acids in the thin layer chromatography (TLC). Cyclotides could be distinguished from the others by comparing the TLC col-oring plots with G-250 and ninhydrin reagents. With this method, cyclotides were discovered in Viola labridorica, V. tricolor, V. hamiltoniana, Momordica charantia, and M. cochinchinensis and over 10 cyclotides were isolated, three of which were determined as known cyclotides cycloviolacin O2, kalata B1 and vary peptide A.展开更多
文摘Cyclopeptides have been investigated phytochemically less often because until now there has not been a special chemical method to detect them. Since we found cyclopeptides in Pseudostellaria heterophylla (Caryophyllaceae) in 1991, we have gradually established a special chemical detection method for detecting cyclopeptides in plants, which induces a new thin layer chromatography (TLC) protosite reaction with ninhydrin reagent. With this method, our group isolated and determined 73 cyclopeptides from 17 plants which belong to 5 families and 14 genuses, they are from dicyclopeptides to undecacyclopeptides, including 68 new ones, and were determined based on spectral, chemical and enzymic methods, especially 2D NMR and FAB-MS. Meantime, with this method cyclopeptides can be distinguished from peptidic amides based on their behaviour in TLC.
基金the National Natural Science Foundation of China (Grant No. 30725048)Foundation of the West Light Program of Chinese Academy of Sciences
文摘Iodine, Dragendorff's reagent, ninhydrin and Coomassie brilliant blue G-250 reagents were used to detect cyclotides from proteins, cyclopeptides, linear-peptides and amino acids in the thin layer chromatography (TLC). Cyclotides could be distinguished from the others by comparing the TLC col-oring plots with G-250 and ninhydrin reagents. With this method, cyclotides were discovered in Viola labridorica, V. tricolor, V. hamiltoniana, Momordica charantia, and M. cochinchinensis and over 10 cyclotides were isolated, three of which were determined as known cyclotides cycloviolacin O2, kalata B1 and vary peptide A.
