A fluorescent terbium-metal-organic framework material for high-sensitivity detection of vomitoxin and oxytetracycline hydrochloride in water.

A unique luminescent lanthanide metal-organic framework (LnMOF)-based fluorescence detection platform was utilized to achieve sensitive detection of vomitoxin (VT) and oxytetracycline hydrochloride (OTC-HCL) without the use of antibodies or biomolecular modifications. The sensor had a fluorescence quenching constant of 9.74 × 106 M-1 and a low detection limit of 0.68 nM for vomitoxin. Notably, this is the first example of a Tb-MOF sensor for fluorescence detection of vomitoxin. We further investigated its response to two mycotoxins, aflatoxin B1 and ochratoxin A, and found that their Stern-Volmer fluorescence quenching constants were lower than those of VT. In addition, the fluorescence sensor realized sensitive detection of OTC-HCL with a detection limit of 0.039 µM. In conclusion, the method has great potential as a sensitive and simple technique to detect VT and OTC-HCL in water.

The hydrogen bond between tryptophan and the host molecule induced fluorescence enhancement.

Tryptophan is one of important amino acids in the human body, therefore its detection is particularly important. The 3,5-bis(4-pyridyl)-4-amino-1,2,4-triazole (BPAT) organic molecule was designed to be used as fluorescence detectors to detect tryptophan molecules for the interaction between the host and the guest. BPAT shows good sensitivity and selectivity towards tryptophan compared with other amino acid molecules. The limit of detection obtained from formula 3δ/KSV is considered to be 5.43 × 10-7  mol/L. We speculated that this change is mainly caused by the hydrogen bond between tryptophan and the host molecule BPAT. This conjecture was verified by the controlled experiments with other host molecules.

[Efficacy of Maixuekang capsule on reconvalescents of cerebral infarction and its impact on coagulation function].

OBJECTIVE: To observe the clinical efficacy of Maixuekang capsule in reconvalescents of cerebral infarction and its impact on coagulation function. METHOD: One hundred and twenty cases of reconvalescents of cerebral infarction were randomly divided into treatment and control groups. The 50 cases in the control group were provided with conventional therapy, while the 70 cases in the treatment group were provided with the combination of conventional therapy and Maixuekang capsule for 3 months. Their neurological function and prothrombin time (PT), activated partial thromboplastin time (APTT) clotting enzyme time (TT), fibrinogen (Fib) were measured before and after treatment. RESULT: After the treatment, PT, APTT and TT were prolonged compared with those before the treatment in the treatment group (P<0.05), whereas Fib, neurological deficit scores decreased (P<0.01) and significantly different from the control group (P<0.05). CONCLUSION: Maixuekang capsule is among safe and effective drugs in treatment of reconvalescents of cerebral infarction, and can improve the patient's coagulation state.