洋葱中重金属分布的ICP-MS分析

采用电感耦合等离子体质谱法测定洋葱中重金属的分布,用硝酸-过氧化氢作消解液, 微波消解法处理样品,ICP-MS 法测定洋葱皮和肉中砷、铅、汞3种重金属元素的含量。测定结果的相对标准偏差RSD< 5.1%, 加标回收率为91.1%～104.9%, 检出限为0.007 2～0.087 ng•g^-1。该方法具有操作简便,快速,灵敏度高,准确度好和多种元素同时测定等优点。     

表面解吸常压化学电离质谱法快速测定冰毒

A method for rapid determination of narcotics by surface desorption atmospheric pressure chemical ionization mass spectrometry (DAPCI-MS) was established. The operation parameters including spray voltage, capillary temperature ect. on analysis performance were systematically investigated. Under the optimized experimental conditions, trace amounts of methamphetamine and caffeine in ice drug were detected rapidly without any sample preparation and pretreatment. Since DAPCI-MS allows rapid analyzing trace amounts of narcotics without sample pretreatment, it was also proposed to couple DAPCI source to a miniature mass spectrometer for fast in-situ analysis of narcotics．     

喷雾干燥与冷冻干燥鸡蛋粉特性研究

以鲜鸡蛋为原料,利用喷雾干燥和冷冻干燥技术制备鸡蛋粉,对比2种蛋粉水分含量、水分活度、溶解度、色差、微观结构等理化性质,同时检测起泡性、乳化性,并选用喷雾干燥蛋黄粉制备凝胶探讨功能特性。结果表明:喷雾干燥蛋粉和冷冻干燥的蛋粉水分含量、水分活度、溶解度和色差差异显著(P<0.05),且喷雾干燥蛋粉和冷冻干燥蛋粉起泡性及乳化性均在氯化钠浓度为0.5 g/100 mL时达到最大值;制备凝胶最佳条件为加水量为150%、氯化钠浓度为3%、温度100℃、热处理15 min。此项研究将对蛋粉的应用奠定理论基础。     

电感耦合等离子体质谱法分析汤岗子热矿泥中微量元素

本工作对汤岗子热矿泥中微量元素进行分析研究。采用微波消解法处理样品, 电感耦合等离子体质谱法对汤岗子热矿泥中钠、镁、锌、锰、铜、锗、钼、铬、铝、镍、汞、铅等12种微量元素进行检测与分析。结果表明, 在优化实验条件下, 方法的检出限为0.000 3~5.86 μg•L^-1, 相对标准偏差为0.91%~6.02%, 回收率为91.10%～108.0%。     

气相色谱-质谱法测定粮谷中丁草胺的残留量

大米、糙米、玉米、大麦、小麦试样用正己烷提取,经凝胶色谱和固相萃取柱净化,气相色谱-质谱仪检测,外标法定量.添加水平在0.01～0.50 mg/kg时,回收率范围为80.6%～98.5%;相对标准偏差为8.6%～15.5%;测定低限为0.010 mg/kg.     

电喷雾萃取电离快速测定尿样中的沙丁胺醇

A method for rapid determination of salbutamol in human urine was proposed in this study. The effects of the operation parameters, including spray voltage, temperature of the heating capillary, flow rate of extracting solvent, etc. on analysis performance were systematically investigated. Under the optimized experimental conditions, salbutamol in human urine is detected rapidly without any sample preparation with a detection limit lower than 0.1 μg•L^－1.     

茶叶中锗、硒的电感耦合等离子体质谱法分析

采用微波消解,电感耦合等离子体质谱(ICP-MS)法测定茶叶中锗、硒元素。对样品前处理方法进行了研究,从消解体系、酸用量、消解程序等方面对微波消解条件进行了优化。在优化实验条件下, 方法的检出限为1.7~28.2 ng•L-1, 相对标准偏差为3.1%~10.0%, 加标回收率为80.8%～95.9%。该方法具有操作简便,快速,灵敏度高,准确度好和同时测定两种元素等优点。     

东北电力大学40-50岁女性身体形态、机能和综合体质水平的研究与评价

从东北电力大学教职工中随机抽取40-50岁的女性50例,进行人体形态、机能和身体素质等综合指标的测量。结果各项身体形态指标均超出了国家标准;而身体综合素质和机能指标均没有达到国家标准。东北电力大学40-50岁女性体质的各项指标都有待于进一步改善和加强。     

纳升喷雾傅里叶变换离子回旋共振串联质谱在肽段断裂分析中的应用

A new sequence analysis of peptides by using nano-electrospray ionization fourier transform ion cyclotron resonance tandem mass spectrometry was demonstrated in the study, and the angiotensin II was chosen as an example. Combined with the collision induced dissociation, FT-MS provides precise mass/charge ratio, but also structure information of the selected peptide. The fragment ions were identified on the basis of the precise molecule weight and peptide sequence was determined successfully. Nano-ESI FT-ICR MSn was determined as useful tool for identification of the unknown peptides, especially for the trace peptides isolated from gel electrophoresis.