液相色譜—串聯(lián)質(zhì)譜法在體內(nèi)有毒動植物成分檢測中的應用
[Abstract]:In our country, many animals and plants are used as medicinal and edible, and some even as "tonic" food. These animals and plants often contain toxic ingredients, even highly toxic ingredients. Their treatment dose is close to that of poisoning. Drug, suicide, poisoning, medical disputes and other cases occur from time to time. The identification of toxic animal and plant components in complex biological systems has long been an unsolved technical problem due to the complex and diverse components, high toxicity, low content, rapid metabolism in the human body, and no specific clinical manifestations of poisoning. There is no effective means and scientific basis for forensic identification, clinical diagnosis, treatment and food safety monitoring of toxic animal and plant poisoning.
The development of modern analytical techniques makes it possible to detect and identify toxic plant and animal components in complex biological systems. In recent years, the application of liquid chromatography-mass spectrometry (LC-MS) in forensic and clinical toxicological analysis has been developed rapidly. It has high performance in on-line separation of liquid chromatography and high selectivity and high sensitivity in mass spectrometry. Liquid chromatography-mass spectrometry (LC-MS) can simultaneously obtain abundant information such as retention time, molecular weight and characteristic structure fragments of compounds. Especially, tandem mass spectrometry can identify the target from complex matrices, and selective ion monitoring or multi-reaction monitoring mode can greatly improve the specificity and sensitivity of the analysis. It is hopeful to solve the problem of detecting trace toxic animal and plant components in complex biological systems, and to use an analytical system for simultaneous detection of a variety of different kinds of targets when the target is not clear or there may be several different kinds of targets in the system. Simple and non-derivatization methods are more sensitive and effective than gas chromatography-mass spectrometry, thus providing a scientific basis for the identification and identification of toxic animal and plant components in complex biological systems.
A systematic screening method for 22 common toxic alkaloids, including aconitine, neoaconitine, hypoaconitine, colchicine and tetrodotoxin, was established. The quantitative analysis methods of aconitine, neoaconitine, hypoaconitine and colchicine were also studied. All-round and systematic validation of the method has solved the key technical problems in LC-MS/MS analysis, such as sample processing, chromatographic separation and optimization, and the selection and optimization of mass spectrometry conditions. At the same time, the distribution of the methods in acute poisoning guinea pigs has been discussed, and the established methods have been successfully applied in forensic practice for the trial of drug-related cases. Li provides scientific evidence.
The specific research contents are as follows:
Firstly, a screening system and confirmation method of 22 toxic alkaloids in blood based on LC-MS/MS-MRM technology were established. The target substances covered the common toxic alkaloids in the actual detection work. The method was simple, rapid, sensitive and specific. Two chromatographic columns with different performance were used for chromatographic separation and detection of the target substances. The detection sensitivity and time required are complementary, and the whole process can be completed within 16 minutes. Except for the slightly higher hydroxycamptothecin (20ng/mL), the vast majority of LOD is sufficient to meet the requirements of forensic toxicology and clinical pharmacology for the detection of poisoning or therapeutic concentration targets.
Two, poisoning and detection and application of Aconitum alkaloids
1. A LC-MS/MS-MRM method for the determination of aconitine, neoaconitine and hypaconitine in blood, urine and tissues was established, and its quantitative method was validated by a comprehensive and systematic method, including the linear range, minimum detection limit, precision, recovery rate, accuracy, matrix effect, stability and so on. The method is simple, rapid and sensitive for the determination of trace aconitine, neoaconitine and hypaconitine in vivo.
2. The distribution of aconitine in body fluid and tissues of acute poisoning guinea pigs was studied. Eight guinea pigs were given aconitine by intragastric administration at a dose of 1.0-4.0 mg/kg. After dissection, the contents of aconitine in body fluid and tissues were determined. The order of aconitine content in body fluid and tissues was: bile > blood > urine > stomach > lung > Blood can be used as the first choice of biological analysis for death analysis.
3. The established method was successfully applied to the identification practice. The contents of trace aconitine in biological samples were qualitatively and quantitatively analyzed. The contents of aconitine, neoaconitine and hypaconitine in body fluids and tissues of several aconitine poisoned corpses were determined. The contents of neoaconitine and hypaconitine in corpse tissues were reported for the first time. The distribution provides clear direction and scientific evidence for the determination of the cause of death and the trial of cases involving Aconitum poisoning.
Three, colchicine poisoning, detection and Application
1. A LC-MS/MS-MRM method for the determination of colchicine in blood, urine and tissues was established, and its quantitative method was systematically and systematically validated, including linear range, minimum detection limit, precision, recovery rate, accuracy, matrix effect, stability and so on. The method is simple, rapid, sensitive and the minimum detection limit can be as low as 0.05ng/mL. It can meet the requirements of forensic toxicology analysis and clinical toxicology analysis.
2. The distribution of colchicine in acute poisoned guinea pigs was studied. Five guinea pigs were given colchicine by intragastric administration at a dose of 4.0 mg/kg. The contents of colchicine in body fluid and tissues were measured after dissection. The order of colchicine content in body fluid and tissues was bile > urine > spleen > stomach > lung > kidney. The content of colchicine in heart blood is the lowest. Urine can be used as the first choice for colchicine analysis.
3. The method has been successfully applied to the identification of poisoned plants. The qualitative and quantitative analysis of colchicine in the biological samples of poisoned corpses and wild plants has provided clear direction and evidence for the determination of the cause of death in poisoned plants.
Four, the detection and application of tetrodotoxin in biological samples.
A method for the determination of tetrodotoxin in blood, urine and tissues by LC-MS/MS-MRM was established. The linear range and the minimum detection limit of the method were investigated. The method was applied to the practical cases of tetrodotoxin poisoning in edible puffer fish and satisfactory results were obtained.
The innovation and significance of this study are as follows:
1. The established screening and analysis method for toxic alkaloids is simple and sensitive, avoiding the missed and mistaken detection phenomena that may occur in biological samples by traditional methods. The whole analysis can be completed within 16 minutes. The screening target covers the common toxic alkaloids in forensic identification, and the LC-MS/MS screening system can follow the target. With the increase and expansion of objects, more targets can be screened. This method is a pioneering method.
2. The validity of the quantitative method in biological samples was expounded systematically and comprehensively, and the evaluation index of the method was standardized. The validity of the method for the determination of aconitine, neoaconitine, hypoaconitine and colchicine in biological samples was proved to be accurate, sensitive, exclusive, reproducible and reliable.
3. A LC-MS/MS-MRM method for the determination of aconitine in biological samples was established. The distribution of neoaconitine and hypaconitine in aconitine-poisoned corpses was reported for the first time, which provided clear direction and evidence for the determination of the cause of death in poisoned plants.
4. A LC-MS/MS-MRM method for the determination of colchicine in biological samples was established. The method is sensitive enough and the detection limit can be as low as 0.05 ng/mL. It can meet the requirements of forensic toxicology analysis and clinical toxicology analysis.
5. A method for the determination of tetrodotoxin in biological samples by LC-MS/MS-MRM was established. The distribution of tetrodotoxin in various tissues of tetrodotoxin poisoned corpses was reported for the first time.
The research results fill the blank of toxic animal and plant detection and evaluation in vivo, and make the component analysis technology of common toxic animal and plant in complex biological system of our country leap to the international advanced level. It will provide a technical platform for the scientific research of toxic animal and plant, poisoning identification, clinical diagnosis and treatment, food safety monitoring and so on.
【學位授予單位】:復旦大學
【學位級別】:碩士
【學位授予年份】:2008
【分類號】:D919.1
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