Conformationally confined three-armed supramolecular folding for boosting near-infrared biological imaging.

Herein, a triphenylamine derivative (TP-3PY) possessing 4-(4-bromophenyl)pyridine (PY) as an electron-accepting group and tris[-(4-pyridylvinyl)phenyl]amine (TPA) with large two-photon absorption cross-sections as an electron-donating group was obtained, and showed intense absorption in the visible light region ( = 509 nm) and weak near-infrared (NIR) fluorescence emission at 750 nm. After complexation with cucurbit[8]uril (CB[8]), TP-3PY showed bright NIR fluorescence emission at 727 nm and phosphorescence emission at 800 nm. When the supramolecular assembly (TP-3PY⊂CB[8]) further interacted with dodecyl-modified sulfonatocalix[4]arene (SC4AD), the fluorescence and phosphorescence emissions were further enhanced at 710 and 734 nm, respectively.

Shape-Persistent Oxa- and Aza-calix[4]arene Hybrid Molecular Cage and Naked Eye Sensing of Fluoride.

An oxa- and aza-calix[4]arene hybrid molecular cage with a large, shape-persistent cavity wrapped by aromatic rings was designed and synthesized via multifold efficient SAr reactions. X-ray single-crystal analysis revealed that two THF molecules were encapsulated in the central cavity. Selective sensing of F in apolar solvent leads to naked eye discriminable color change.

[Identification of elephantopi herba and its adulterants by LM/SEM observation and TLC scanning].

Objective: To provide identification basis for distinguishing Elephantopi Herba and its adulterants.

Methods: Light microscopy (LM), scanning electron microscopy (SEM) and thin layer chromatography scanning (TLCS) methods were used to identify Didancao (Elephantopus scaber) and its adulterants Baihuadidancao (Elephantopus mollis) and Jiadidancao (Pseudelephantopus spicatus).

Results: Based on the microscopic features and TLC profiles, the commercial Didancao samples retailed in mainland China, Taiwan, Hong Kong and Macau markets were identified as Elephantopus scaber.

Applications of ultra-performance liquid chromatography to traditional Chinese medicines.

Ultra-performance liquid chromatography (UPLC), as a development of the chromatographic technique, was used in the quality control of Panax ginseng C.A. Mey.

[Study on fingerprint of Maodongqing injection by HPLC].

Objective: To establish the fingerprint of Maodongqing injection by HPLC.

Methods: The column of ODS-2 Hypersil C18 (4.6 mm x 200 mm, 5 microm) was used.