Determination of tetrodotoxin in salted pufferfish by liquid chromatography-tandem mass spectrometry / 预防医学

Objective@#To develop a liquid chromatography-tandem mass spectrometry (LC-MS/MS) method with cation exchange-based solid phase extraction (SPE) for determination of tetrodotoxin (TTX) in salted pufferfish. @*Methods@#Evenly crushed salted pufferfish samples were subjected to ultrasound-assisted extraction with 0.5% acetic acid/50% methanol/water. The extract was cleaned with cation exchange-based SPE cartridge and eluted with 0.3% hydrochloric acid and 50% acetonitrile/water. The eluent was neutralized with ammonia and separated with a Waters XBridgeTM BEH Amide column (150 mm×3.0 mm, 1.7 μm), and determined using LC-MS/MS in a multiple reaction monitoring mode.@*Results@#The matrix effects of TTX were 85.7%-92.4%, and the matrix suppression effect was under effective control following clean-up procedures using the optimized SPE method. The TTX showed a good linear relationship at the range of 2.0 to 4 000 μg/kg, with a correlation coefficient (r2) of 0.999 2. The limits of detection and quantitation for TTX in sample matrix were 1.0 μg/kg and 2.0 μg/kg, respectively. The mean spiked-recovery rates were 81.2% to 96.5% at spiked amounts of 2.0, 200 μg/kg and 2 200 μg/kg, with relative standard deviations (RSDs) of 4.3% to 7.5%. The intraday accuracy and precision of TTX were 84.4% to 95.6% and 4.9% to 5.8% in quality control samples, and the interday accuracy and precision of TTX were 86.1% to 94.9% and 5.5% to 8.5% in quality control samples. The detection of TTX was 60.5% in 38 market-sold salted pufferfish products using the established LC-MS/MS method.@*Conclusion@#The established LC-MS/MS method is effective for accurate quantitative determination of TTX in salted pufferfish.

Clinical application characteristics of Ciwujia Injection in treatment of 5 904 cases with cardiovascular disease in real world / 中国中药杂志

To investigate the clinical characteristics and the rule of administration of Ciwujia Injection in patients with cardiovascular disease by correlation analysis and frequency analysis. The information of 5 904 patients who used Ciwujia Injection to treat cardiovascular disease for at least three times in the hospital information system(HIS) of 19 comprehensive tertiary hospitals nationwide. The frequency analysis method was used to analyze the higher frequency variables, and the algorithm of Apriori correlation analysis method was used to analyze the clinical characteristics and medication laws of Ciwujia Injection in treating patients with cardiovascular disease. Among the 5 904 patients, the median age of the patients was 70 years, and the number of patients between 65-75 years old was up to 2 096(35.5%). There were more women than men in terms of diagnosis and treatment, and the women at age of 45-65 and 65-75 years old were more than men. The top three diagnoses by Western medicine were coronary heart disease in 8 104 cases(65.66%), dyslipidemia in 2 515 cases(20.38%), and cardiac function grade Ⅱ-Ⅲ in 581 cases(4.71%), while the largest number of syndromes in traditional Chinese medicine(TCM) at discharge was 1 109(21.37%) in other type, followed by 739 cases(14.24%) of Qi deficiency and blood stasis syndrome, and 698(13.46%) of liver and kidney Yin deficiency syndrome. The most frequently used Western medicine in combined use was Nifedipine in 2 567 cases(7.21%), and most frequently used TCM was Compound Xianzhuli Liquid leachate in 766 cases(3.53%). From the results of pharmacological analysis, the frequency of using Ciwujia Injection + stasi-seliminating agent + calcium channel blocking drugs was highest when using 1 Chinese medicine combined with 1 or 2 Western medicines. In the use of 2 Chinese medicines combined with 1 Western medicine, Ciwujia Injection + heat-clearing agent + stasis-eliminating agent + calcium channel blocker was the most common. This study demonstrated that Ciwujia Injection was more common in middle-aged and elderly patients and more in women than men. Treatment should be based on different cardiovascular disease treatment guidelines to reduce complications caused by underlying diseases, and attention should be paid to the prevention and treatment of cardio-vascular disease risk factors such as hypertension, diabetes and abnormal lipid metabolism. According to the analysis of frequency distribution and association rules, it was concluded that Ciwujia Injection was mainly used in combination with calcium channel blockers and stasis-eliminating agents in the treatment of cardiovascular disease. In the treatment of cardiovascular diseases by Ciwujia Injection in combination with other Chinese and Western medicines, in order to avoid pharmacological changes and avoid affecting the efficacy of the drug, it is necessary to closely observe whether adverse reactions occur and ensure that the medication is safe and effective. This study provides a good reference for the follow-up clinical guidance of Ciwujia Injection.

Proteomic Analysis of Rat Brain Stem with DAI by MALDI-TOF-MS / 法医学杂志

OBJECTIVE@#To establish a diagnostic model for diffuse axonal injury (DAI) by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF-MS). To screen the proteins or peptides associated with DAI for providing the biomarkers with theoretic foundation.@*METHODS@#Fifteen male Sprague-Dawley rats were randomly divided into DAI group (n = 10) and control group (n = 5). The protein or peptide expression profiles of rat brain stem were detected by MALDI-TOF-MS. ClinProTools 2.2 software was used to find specific peaks, and a diagnostic model was established by the genetic algorithm.@*RESULTS@#There were significant differences in 61 peaks of DAI group (P < 0.05), 9 peaks were down-regulated and 52 up-regulated. The diagnostic model was established based on 5 different peaks. The specificity and sensitivity of cross validation was 96.14% and 95.98%; while the specificity and sensitivity of blind validation showed was 73.33% and 70.00%, respectively.@*CONCLUSION@#A specific and sensitive diagnostic model of DAI can be established by MALDI-TOF-MS to provide a potential value for determining DAI in forensic practice.

Application of finite element method in evaluation of craniocerebral trauma / 法医学杂志

FEM combined with modern computer technology is a mathematical method for stress analysis. It has gradually become a significant experimental tool to explore the functions of biomechanically simulated human body structure and mechanism of craniocerebral injuries. This paper reviewed the features and biomechanical materials of the FEM human head models, materials assignment and their applications in blunt injury, fall, traffic accident. It also explore their merits and values in forensic head injury cases.