Electrochemical sensor for acetaminophen based on layer-by-layer self assembly technique / 药学学报

A novel type of carbon nanotube-coated Au nanoparticle and [bmim]BF4 composite modified glassy carbon electrode was fabricated by a layer-by-layer self-assembly technique. The electrochemical performance of acetaminophen (ACOP) on the modified electrode was investigated by cyclic voltammetry. The Nafion/GNPs/RTIL/MWNTs/GC electrode showed an excellent electrocatalytic activity for the oxidation of ACOP and accelerated electron transfer between the electrode and ACOP. For ACOP, the reversible electrochemical process was observed on the Nafion/GNPs/RTIL/MWNTs/GC electrode, while irreversible electrochemical process occurred on the GC electrode. For the Nafion/GNPs/RTIL/MWNTs/GC electrode, the anodic peak potential of ACOP was moved from 0.562 V to 0.413 V, with a potential drop of 149 mV. At the same time, the reduction peak potential was 0.384 V, and the potential difference was only 29 mV. It was shown that the modified electrode possessed higher electrocatalytic activity and more sensitive effect for the detection of ACOP than both MWNTs/GC electrode and GC electrode. The effects of the different experimental conditions on the electrochemical behaviors of ACOP were explored. Under the optimum conditions of preparation and experimental, the linear calibration curves of ACOP were obtained in a wide range of 2 x 10(-1) to 4.0 x 10(-4) mol x L(-1) with a correlation coefficient 0.999 2 and a detection limit of 2.6 x 10(-8) mol x L(-1) (the ratio of signal to noise, 3:1). The recovery rate was 97.9%-100.8%. This method can be used to determine ACOP in paracetamol tablets with satisfactory results.

Covariance analysis on the change of quality of life affected by percutaneous coronary intervention for patients with coronary heart disease / 中华流行病学杂志

Objective To compare changes of quality of life at 3 months from baseline among patients who underwent and did not undergo percutaneous coronary intervention (PCI). Methods Sixty one patients with coronary artery disease, who were hospitalized in Cardiology Department in March 2008, were followed-up for 3 months after being discharged. SF-36 and QOL-35 were administered before PCI and at 3 months. Patients were divided into 2 groups according to whether they underwent PCI. Changes of quality of life scores between PCI and non-PCI groups were compared using analysis of covariance. Results There were 24 cases in non-PCI group and 37 in PCI group. Baseline characteristics were well balanced between PCI and non-PCI groups except gender (67.6% vs. 28.6% for male, P=0.005) , history of angina (56.8% vs. 23.8% , P=0.015) , smoking history(51.4% vs.23.8%,P=0.037) and Judkins classification of coronary artery(P=0.001). Multivariate analysis of covariance showed that the change of life quality between non-PCI group and PCI group in 3-months after discharge had statistical differences in total scores(P=0.044) and mental health scores (P=0.003) of SF-36, total scores (P=0.039) and social function scores (P=0.007) of QOL-35. Conclusion PCI can improve life quality in patients with coronary artery disease.

Analysis on the correlation between SF-36 and QOL-35 in patients and coronary artery disease / 中华流行病学杂志

Objective To analyze the correlation between SF-36 and QOL-35 and the consistency of the two kinds of life-quality questionnaires when evaluating the quality of life in patients with coronary heart disease. Methods 781 in-hospital-patients, who underwent coronary angiography from June 2008 to April 2009, were included in this study. Quality of life was measured by the Chinese versions of SF-36 and QOL-35. Demographic and clinical information were collected.Correlation Analysis was done between SF-36 and QOL-35 in the patients with coronary artery disease. Results The total score of SF-36 was 62.63 ± 12.47 and the QOL-35 total score was 62.70 ± 9.69. Data from the simple correlation analysis showed that SF-36 and QOL-35 total scores (r=0.725, P＜0.01 ), SF-36 physical functioning and QOL-35 independent living capacity (r=0.933, P＜0.01), SF-36 mental health and QOL-35 mental health (r=0.132, P＜0.01), SF-36 social function and QOL-35 social function score (r=0.215, P＜0.01 ) were all relevant. Canonical correlation analysis showed that there was significant correlation between SF-36 and QOL-35 (r=0.946, P＜0.01 ). Conclusion SF-36 and QOL-35 were consistent in the evaluation on the quality of life, at the overall level.

Microcalorimetric investigation of two cephalosporins on colon bacteria activity / 药学学报

The effects of cephradinum and ceftazidime on the metabolism of Escherichia coli (E. coli) DH5alpha was determined by microcalorimetry. The microbial activity was recorded as power-time curves through an ampoule method with a TAM Air Isothermal Microcalorimeter at 37 degrees C. The parameters such as the growth rate constant (k), inhibitory ratio (I), the maximum power output (Pm) and the time (tm) corresponding to the maximum power output were calculated. The results show that the ceftazidime has a better inhibitory effect on E. coli DH5alpha than cephradinum.