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为建立一种快速测定食品中痕量丙烯酰胺的灵敏准确、快速简便的新方法,以市售食品为样品,丙烯酰胺经提取后,利用其对鲁米诺—高锰酸钾化学发光体系的抑制作用,测定样品中的丙烯酰胺,并对体系的测定条件进行了优化。结果表明:丙烯酰胺测定的线性范围为1.0×10-10~1.0×10-4mol/L,相关系数r为0.9993,方法检出限为3.40×10-13mol/L,加标回收率为85.7%~98.2%,样品平行测定的相对标准偏差RSD为2.4%(n=9)。与气相色谱法对照测定,通过F检验和t检验表明,两种方法之间不存在显著性差异,结论的置信度为95%。该分析体系线性范围宽,灵敏度高,易实现自动化。具有简便快捷、成本低廉、实用性强、易于现场检测等优点,可用于食品中丙烯酰胺的测定。 相似文献
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基于一定浓度范围内元素铍对Luminol-H2O2体系的化学发光的抑制作用,采用流动注射技术,建立了流动注射化学发光法测定铍的方法,该法线性范围是1×10-6~1×10-9mol·L-1,对1×10-8mol·L-1的铍溶液进行11次平行测定,相对标准偏差为1.58%. 相似文献
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目的:建立面粉中过氧化苯甲酰含量测定的化学发光新方法。方法:过氧化苯甲酰氧化KI 生成I2,该反应和luminol-H2O2 化学发光体系相耦合,进而对面粉中的过氧化苯甲酰进行测定。结果:方法的线性范围为3.0 × 10-8~4.0 × 10-6g/mL,检出限为4.0 × 10-9g/mL, RSD 为2.2%(质量浓度5.0 × 10-8g/mL,11 次平行测定)。结论:该方法具有简单、灵敏、线性范围宽的优点。 相似文献
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化学发光分析技术近些年来得到快速发展,并已广泛应用到各个领域,如生物技术、制药、临床医学、环境检测和食品分析等。 相似文献
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基于绿原酸对鲁米诺-溶解氧体系化学发光反应的抑制作用,结合流动注射技术,建立了绿原酸化学发光分析法,用于人体血清、金银花水提液中绿原酸测定,实现了样品中超痕量的分析.当绿原酸的质量浓度为1.0ng·mL^-1~100.0ng·mL^-1时,化学发光强度的减小值与其浓度呈线性关系.测定的检出限为0.33ng·mL^-1,线性相关系数r^2=0.9978,加标回收率为95.8%~105.5%.在流速为2.0mL·min^-1时,该方法完成一次绿原酸的测定只需0.5min,相对标准偏差为5.0%,并且选择性和灵敏度较高. 相似文献
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基于碱性条件下毒黄素对鲁米诺—过氧化氢—纳米氧化铜化学发光体系光强的显著抑制作用,建立了一种在线监测和预警新方法。结合流动注射分析手段,通过微弱发光测量仪测定不同混合溶液光强。对4个影响因素进行单因素试验得出最佳结果,在此基础上经响应面优化各试验条件后进行标准曲线绘制及检出限测定,最后对不同水样进行加标回收。结果表明,该方法线性范围0.005~5.000mg/L,检出限0.001mg/L,加标回收率84%~114%。对浓度0.05 mg/L毒黄素平行测定11次,相对标准偏差(RSD)0.28%。该方法快捷便利,操作性强,可应用于城市饮水中毒黄素潜在突发性污染的快速在线监测和预警。 相似文献
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为应对突发性脱氧雪腐镰刀菌烯醇污染饮用水事件的发生,基于脱氧雪腐镰刀菌烯醇对鲁米诺—过氧化氢体系的促进作用,建立流动注射化学发光在线检测脱氧雪腐镰刀菌烯醇的新方法。在优化的试验条件下,该方法测定脱氧雪腐镰刀菌烯醇的线性范围为0.001~4.000 mg/L;检出限(S/N=3)为0.001 mg/L;相对标准偏差(RSD,n=11)为1.89%;不同加标水平下的加标回收率为67.33%~94.50%;相对标准偏差(n=3)小于2.34%。该方法具有灵敏度高、分析速度快及操作简便等优点,可应用于突发性脱氧雪腐镰刀菌烯醇污染的在线快速检测和应急预警。 相似文献
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研究小麦及其土壤中微量铬的相关性,为富铬小麦品种的选育和富铬功能性食品的开发提供科学依据。用微波消解样品,建立流动注射化学发光法测定彩色小麦、普通小麦以其土壤中铬含量的方法。结果表明:在五个地区种植的六个品种小麦,铬含量在0.126 3~0.451 6μg/g之间。不同品种小麦的铬含量有所不同,普通紫麦的铬含量较高;同一品种小麦在不同地区种植,其铬含量也不同,商丘地区小麦铬含量较高。在同一生长环境下,不同品种的小麦铬的生物吸收比不同,普通紫麦的生物吸收比较大,商丘地区种植的普通紫麦的生物吸收比高达27.62%,是补充铬的理想原料,有一定的培育前景。 相似文献
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Houyong Liu Xiaofei Gao Lichuan Niu Xin Li Zhenghua Song 《Journal of the science of food and agriculture》2008,88(15):2744-2748
BACKGROUND: A sensitive, rapid and simple chemiluminescence procedure, based on the enhancing effect of patulin on the chemiluminescence (CL) reaction between luminol and hydrogen peroxide in a flow injection (FI) system, has been proposed for the determination of patulin. RESULT: The increment of CL intensity was linear over the concentration of patulin ranging from 0.05 to 80 ng mL?1, with a detection limit (3S/N) of 0.01 ng mL?1. At a flow rate of 2.0 mL min?1, a complete analysis could be performed in 25 s with a relative standard deviation of less than 4.0%. CONCLUSION: The proposed method was successfully applied to the measurement of apple juice samples obtained from the Shaanxi Entry–Exit Inspection and Quarantine Bureau. The recoveries were between 93.4 and 107.9% Copyright © 2008 Society of Chemical Industry 相似文献
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Rosa Puchades Alicia Suescun Angel Maquieira 《Journal of the science of food and agriculture》1994,66(4):473-478
A flow injection manifold has been developed for the spectrophotometric determination of free fatty acids (FFA) at 716 nm after continuous extraction into an organic phase of soaps formed by the reaction of copper acetate with the analytes. The carrier system stream was toluene and the reagent stream aqueous copper acetate-pyridine (50 g litre?1). The calibration graph was linear over the range 1 × 10?4 to 5 × 10?3 M oleic acid using an injection volume of 115 μl. The injection rate was 75 samples h?1 with a precision of 109% (RSD). Though this procedure does not permit the total recovery of short-chain fatty acids it is very effective in reflecting the total concentration of FFA. The system has been applied to the determination of total FFA in olive oil, milk fat and cocoa butter. Although the values obtained by the proposed method are lower than those obtained by the reference method (titration) and by chromatography, their comparison shows good linearity. 相似文献
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为建立一种快速测定食品中微量铬的新方法,以贼小豆、玉米、燕麦为样品,根据Cr3+对Luminol-H2O2化学发光体系的线性催化特性,用标准加入校正法快速测定。结果表明:在试液p H为2.50和增益为1的最佳条件下,对1.00×10-12mol/L的Cr3+,测定的相对标准偏差(n=11)RSD为3.2%,按3倍标准偏差计算的检出限为2.30×10-13mol/L,加标回收率为92.0%98.1%,贼小豆、玉米、燕麦样品中铬的含量依次为46.64、31.22、38.66μg/g。该方法选择性好、快速准确、操作简便、重现性好、灵敏度高、用于粮食样品中铬的测定,结果令人满意。 相似文献
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In this paper, based upon the phenomenon that melamine can obviously enhance the CL signal of the luminol–H2O2 system in basic medium, a simple, rapid and sensitive flow injection chemiluminescence (FI-CL) method for the determination of melamine has been developed. Under the optimum conditions, the linear range for the determination of melamine was 0.2–80 μg mL−1 with a detection limit of 0.12 μg mL−1 calculated as proposed by IUPAC and a relative standard deviation of 3.26% for 11 solutions of 10 μg mL−1 melamine on the same day. The proposed method was satisfactorily applied to determine melamine in milk-based products and satisfactory results were obtained without interferences from the sample matrix. Moreover, one assay produce takes only 25 s and the minimum sampling rate is about 120 samples h−1, which indicated that the FI-CL method was suitable for high throughput and real-time melamine analysis. 相似文献