AIM To modify the structure of gastrodin using cell suspension cultures of Platycodon grandiflorum as biocatalyst. METHODS Using plant tissue and cell culture techniques to establish cell suspension cultures, and chro...AIM To modify the structure of gastrodin using cell suspension cultures of Platycodon grandiflorum as biocatalyst. METHODS Using plant tissue and cell culture techniques to establish cell suspension cultures, and chromatographic and spectral techniques to isolate and identify the product. RESULTS 1) The medium of MS + 5 0 mg·L -1 NAA was good for the induction and growth of the callus cultures, and that of MS + 0 5 mg·L -1 NAA + 0 5 mg·L -1 6 BA + 0 2 mg·L -1 2,4 D for the growth of suspended cell cultures. 2) Gastrodin was bioconverted to p hydroxy methyl phenol, the deglucosylderivative, in good yield by cell suspension cultures of Platycodon grandiflorum . CONCLUSION Biotransformation using plant cell suspension cultures is an approach to structural modification of some natural products.展开更多
从4,4'-二氟三苯二酮(DFTBDK)和酚酞出发,利用"拟高稀(pseudo high dillution)"技术,一步法制备酚酞聚芳醚酮酮环状齐聚物(c-PEKK-C),成环率78%。基质辅助激光解吸电离飞行时间质谱MALDI-TOF MS数据表明,聚合产物系聚合度为n=...从4,4'-二氟三苯二酮(DFTBDK)和酚酞出发,利用"拟高稀(pseudo high dillution)"技术,一步法制备酚酞聚芳醚酮酮环状齐聚物(c-PEKK-C),成环率78%。基质辅助激光解吸电离飞行时间质谱MALDI-TOF MS数据表明,聚合产物系聚合度为n=2~8的环状低聚物,其中以二、三聚体为主要成分(占环化产物的85%)。运用J-S高分子环化理论证实4,4'-二氟三苯二酮的单体结构有利于形成环状化合物。以4,4'-联苯二酚钾盐为催化剂,在300~350℃范围内,N2气保护下,环状齐聚物进行熔融开环聚合反应得到相应的线性高相对分子质量酚酞聚芳醚酮酮(ROP-PEKK-C),GPC测得其Mw为1.2×10^5。展开更多
文摘AIM To modify the structure of gastrodin using cell suspension cultures of Platycodon grandiflorum as biocatalyst. METHODS Using plant tissue and cell culture techniques to establish cell suspension cultures, and chromatographic and spectral techniques to isolate and identify the product. RESULTS 1) The medium of MS + 5 0 mg·L -1 NAA was good for the induction and growth of the callus cultures, and that of MS + 0 5 mg·L -1 NAA + 0 5 mg·L -1 6 BA + 0 2 mg·L -1 2,4 D for the growth of suspended cell cultures. 2) Gastrodin was bioconverted to p hydroxy methyl phenol, the deglucosylderivative, in good yield by cell suspension cultures of Platycodon grandiflorum . CONCLUSION Biotransformation using plant cell suspension cultures is an approach to structural modification of some natural products.
文摘从4,4'-二氟三苯二酮(DFTBDK)和酚酞出发,利用"拟高稀(pseudo high dillution)"技术,一步法制备酚酞聚芳醚酮酮环状齐聚物(c-PEKK-C),成环率78%。基质辅助激光解吸电离飞行时间质谱MALDI-TOF MS数据表明,聚合产物系聚合度为n=2~8的环状低聚物,其中以二、三聚体为主要成分(占环化产物的85%)。运用J-S高分子环化理论证实4,4'-二氟三苯二酮的单体结构有利于形成环状化合物。以4,4'-联苯二酚钾盐为催化剂,在300~350℃范围内,N2气保护下,环状齐聚物进行熔融开环聚合反应得到相应的线性高相对分子质量酚酞聚芳醚酮酮(ROP-PEKK-C),GPC测得其Mw为1.2×10^5。