scholarly journals Rapid assay of picogram level of sudan I in hot chilli sauce by flow injection chemiluminescence

2007 ◽  
Vol 21 (2) ◽  
pp. 135-141 ◽  
Author(s):  
Xiaofei Gao ◽  
Houyong Liu ◽  
Zhenghua Song ◽  
Xili He ◽  
Faxin Dong
Keyword(s):  
Standard Deviation ◽  
Relative Standard Deviation ◽  
Flow Rate ◽  
Flow Injection ◽  
Chemiluminescence Detection ◽  
Chemiluminescence Method ◽  
Chemiluminescence Intensity ◽  
Relative Standard ◽  
Sudan I ◽  
Flow Injection Chemiluminescence

A novel chemiluminescence method for the assay of sudan I was designed using flow injection with chemiluminescence detection. The proposed method was based on the increment effect of sudan I on the chemiluminescence intensity in the luminol–KIO4system. The increment of chemiluminescence intensity was correlated with the sudan I concentration in the range from 0.1 to 10 pg ml−1, and the determination could be performed in 0.5 min in flow rate of 2 ml min−1, including sampling and washing, giving a throughput of 120 h−1with a relative standard deviation of less than 5.0%. The method had been successfully applied to the assay of sudan I in Pixian douban, Golden mark guilin chilli sauce and Golden mark satay sauce, and the recovery was 90.0–103.8%.

scholarly journals Ultrasensitive determination for picomolar-level midecamycin in human serum by flow injection chemiluminescence using luminol–BSA system

2011 ◽  
Vol 26 (6) ◽  
pp. 349-355 ◽  
Author(s):  
Hairu Lv ◽  
Xijuan Tan ◽  
Yun Zhang ◽  
Zhenghua Song
Keyword(s):  
Standard Deviation ◽  
Detection Limit ◽  
Human Serum ◽  
Flow Rate ◽  
Flow Injection ◽  
Inhibitory Effect ◽  
Analysis Procedure ◽  
Serum Samples ◽  
Relative Standard ◽  
Flow Injection Chemiluminescence

An ultrasensitive method for determining picomolar midecamycin (MID) by flow injection (FI) chemiluminescence (CL) was first described based on the inhibitory effect of MID on luminol–BSA reaction. It was found that the CL intensity decrements were linear with the logarithm of MID concentrations in the range of 1.0–5000 pmol · l–1with a detection limit as low as 0.3 pmol · l–1(3σ). The relative standard deviation of seven repetitive measurements for 10 pmol · l–1MID was 3.0%. At a flow rate of 2.0 ml · min–1, the whole analysis procedure including sampling and washing could be finished in 30 s, offering the sample efficiency of 120 h–1. This proposed method was successfully applied to determine MID in human serum samples with the recoveries from 96.0 to 110.0%. The CL mechanism of luminol–BSA–MID reaction was also given.

Automated multiple flow-injection analysis in clinical chemistry: determination of albumin with bromcresol green.

1980 ◽  
Vol 26 (2) ◽  
pp. 331-334 ◽  
Author(s):  
B W Renoe ◽  
K K Stewart ◽  
G R Beecher ◽  
M R Wills ◽  
J Savory
Keyword(s):  
Standard Deviation ◽  
Relative Standard Deviation ◽  
Flow Injection ◽  
Flow Injection Analysis ◽  
Clinical Chemistry ◽  
Analytical Results ◽  
Relative Standard ◽  
Clinical Chemical ◽  
Bromcresol Green

Abstract We describe an adaptation of automated multiple flow-injection analysis instrumentation to an analysis for albumin in serum. The bromcresol green reaction was used to test the utility of the system. The approach yielded albumin results with excellent sensitivity, no measurable carryover, a relative standard deviation of less than 1%, good correlations with published procedures, and no measurable interferences. The simplicity and flexibility of the instrumentation and its performance integrity, as indicated by the analytical results, make this a viable clinical chemical tool.

A Study on Gadolinium Sensitized Chemiluminescence System

2012 ◽  
Vol 535-537 ◽  
pp. 1337-1340 ◽  
Author(s):  
Chi Yang ◽  
Nai Lin Ren
Keyword(s):  
Standard Deviation ◽  
Detection Limit ◽  
Linear Relationship ◽  
Relative Standard Deviation ◽  
Optimum Conditions ◽  
Chemiluminescence Intensity ◽  
Experimental Conditions ◽  
Relative Standard

A new chemiluminescence system was built by using gadolinium as sensitizer, and the analysis capabilities of this system was tested as below. The method is based on chemluminescence of Ce (IV)-SO32- sensitized by Gd3+-OFLX. The effects of some critical experimental conditions were discussed and the optimum conditions for chemluminescence emission were investigated. The linear relationship between the relative chemiluminescence intensity and the concentration of OFLX is in the range of 2×10-9 g/mL～5×10-7 g/mL with a detection limit of 1.0×10-9g/mL .The relative standard deviation is 2.8% (n=11) for a level of 5.0×10-7 g/mL. The method has been applied to the analysis of OFLX in tablets with satisfactory results.

scholarly journals Operator-free flow injection analyser

1991 ◽  
Vol 13 (4) ◽  
pp. 143-146 ◽  
Author(s):  
Celio Pasquini ◽  
Lourival C. de Faria
Keyword(s):  
Standard Deviation ◽  
Relative Standard Deviation ◽  
Flow Injection ◽  
Digital Signal ◽  
Sample Introduction ◽  
Free Flow ◽  
Relative Standard

A flow injection analyser has been constructed to allow an operator-free determination of up to 40 samples. Besides the usual FIA apparatus, the analyser includes a home-made sample introduction device made with three electromechanical three-way valves and an auto-sampler from Technicon which has been adapted to be commanded by an external digital signal. The analyser is controlled by a single board SDK-8085 microcomputer. The necessary interface to couple the analyser components to the microcomputer is also described. The analyser was evaluated for a Cr(VI)-FIA determination showing a very good performance with a relative standard deviation for 15 signals from the injection of 100 μl of a 1.0 mg.ml-1standard Cr(VI) solution being equal to 0.5%.

Determination of Trace Chromium (VI) in Tanning Wastewater by Flow Injection Spectrophotometry

2010 ◽  
Vol 113-116 ◽  
pp. 1732-1734
Author(s):  
Xin Zhao ◽  
Zhi Hui Sui ◽  
Jing Bin Zhang
Keyword(s):  
Standard Deviation ◽  
Relative Standard Deviation ◽  
Flow Injection ◽  
Spectrophotometric Method ◽  
H2so4 Solution ◽  
Optimum Conditions ◽  
Chromium Vi ◽  
Relative Standard ◽  
Simple Flow

In 1.0 mol/L H2SO4 solution, a rapid and simple flow—injection spectrophotometric method has been developed for Cr(Ⅵ) determination, based on the violet—red Cr(Ⅵ)—diphenylcarbazide chelates formed by reactions. The results show, under optimum conditions, the maximum absorption of the complex is at 540 nm and the detection limits of the method is 0.0136mg/L for Cr(Ⅵ) and Beer’s law is obeyed for Cr(Ⅵ) in the range of 0.03—1.60mg/L. The determination frequency is l00 times/h. The relative standard deviation of eleven replicates is less than 4.0%. The method has been applied to the determination of trace Cr(Ⅵ) in tanning wastewater with satisfactory results.

scholarly journals Amberlite XAD-2 impregnated Cyanex272: sorption desorption studies of thorium(IV)

2011 ◽  
Vol 1 (1) ◽  
pp. 83-87
Author(s):  
M. Karve ◽  
J. V. Gholave
Keyword(s):  
Standard Deviation ◽  
Relative Standard Deviation ◽  
Flow Rate ◽  
Limit Of Detection ◽  
Phase Flow ◽  
Batch Studies ◽  
Flow Rates ◽  
Relative Standard ◽  
Impregnated Resin ◽  
Optimized Conditions

Abstract Amberlite XAD-2 impregnated with Cyanex272 was packed in a column and studied for separation and recovery of Th(IV). The effect of various parameters influencing sorption of Th(IV) viz. acid concentration, aqueous phase flow rates, nature and concentration of eluents and other ions were systematically studied. Under optimized conditions Th(IV) was quantitatively sorbed from 0.001 M HNO3 and recovered using 10 cm3 of 4.0 M HCl at 0.6 cm3 min−1 flow rate. Batch studies using impregnated resin were evaluated for using Langmuir and Freundlich adsorption isotherms. The sorption capacity of the impregnated resin for Th(IV) was 8.48 mmol g−1. The limit of detection for Th(IV) was 0.67 μg dm−3 and a reusability for more than 65 cycles was observed. The method developed was applied for isolation of Th(IV) from monazite sand. It was reproducible with a relative standard deviation (R.S.D.) of 0.8%.

Determination of risperidone at picogram level in human urine by luminol—H2O2 chemiluminescence

2006 ◽  
Vol 60 (4) ◽  
Author(s):  
X. Xie ◽  
X. Shao ◽  
Z. Song
Keyword(s):  
Flow Injection ◽  
Human Urine ◽  
High Sensitivity ◽  
Chemiluminescence Method ◽  
Synergistic Enhancement ◽  
Relative Standard ◽  
Sensitive Determination ◽  
Flow Injection Chemiluminescence ◽  
Simple Flow

AbstractA simple flow-injection chemiluminescence method with synergistic enhancement has been investigated for the rapid and sensitive determination of antipsychotic risperidone. The synergistic action was significant in the chemiluminescence system of luminol—hydrogen peroxide with risperidone as an enhancer. The increased chemiluminescence intensity was correlated with risperidone concentration within the range from 10 pg mL−1 to 1.0 ng mL−1 with relative standard deviations lower than 5.0 % and the detection limit of 4 pg mL−1. At a flow rate of 2.0 mL min−1, the flow-injection chemiluminescence method exhibited both a high sensitivity and excellent selectivity giving a throughput of 120 times per hour. The proposed method was successfully applied to determine the risperidone content in human urine without any pretreatment. It was found that the excretive amounts of risperidone reached their maximum after taking 2.0 mg of risperidone for 1 h, with a total excretive ratio of 17.37 % in 8.5 h.

scholarly journals Ultrasensitive determination of amoxicillin using chemiluminescence with flow injection analysis

2006 ◽  
Vol 20 (1) ◽  
pp. 37-43 ◽  
Author(s):  
Xiaofeng Xie ◽  
Zhenghua Song
Keyword(s):  
Hydrogen Peroxide ◽  
Standard Deviation ◽  
Detection Limit ◽  
Flow Injection ◽  
Pharmaceutical Preparations ◽  
Chemiluminescence Intensity ◽  
Relative Standard ◽  
Human Urine And Serum ◽  
Urine And Serum

Results presented here reveal that amoxicillin can greatly enhance the chemiluminescence intensity generated from the reaction between luminol and hydrogen peroxide. The increment chemiluminescence signal was linearly dependent on amoxicillin concentration in the range from 10 pg·ml−1to 2 ng·ml−1(r2=0.9978) offering a detection limit as low as 3.5 pg·ml−1(3σ). At a flow rate of 2.0 ml·min−1, one analysis cycle, including sampling and washing, can be accomplished in 20 s with a relative standard deviation of less than 5%. The sensitive flow injection method was applied successfully to determine of amoxicillin in pharmaceutical preparations, human urine and serum without any pretreatment procedure, with recovery from 90.0% to 110.0% and relative standard deviations of less than 5.0%.

Determination of Prednisone Acetate at Trace Level by Flow Injection Analysis with Tris(1,10-Phenanthroline) Ruthenium(II) Chemiluminescence Detection

2011 ◽  
Vol 236-238 ◽  
pp. 2729-2732
Author(s):  
Pi Xue Gong ◽  
Wei Hua Liu ◽  
Wen Wen Liu ◽  
Kang Du ◽  
Kang Liu ◽  
...  
Keyword(s):  
Standard Deviation ◽  
Detection Limit ◽  
Flow Injection ◽  
Acidic Medium ◽  
Luminescent Properties ◽  
Chemiluminescence Detection ◽  
Trace Level ◽  
Experimental Conditions ◽  
Relative Standard

A simple, sensitive and rapid method for flow injection with chemiluminescence analysis has been developed for the determination of prednisone acetate at trace level. This method is based on the luminescent properties of the tris(1,10-phenanthroline) ruthenium(II)-potassium permanganate -prednisone acetate in acidic medium sensitized by Na2SO3. The optimized experimental conditions are evaluated. Under the optimum experimental conditions, the linear ranges of prednisone acetate are: 4.0×10-10~4.0×10-8g·mL-1and 4.0×10-8~2.0×10-7g·mL-1with a low detection limit is 4.5×10-11g·mL-1and the relative standard deviation for 1.0×10-8g·mL-1sample is 1.04% (n=11). The proposed method has been successfully applied to the determination of prednisone acetate in tablets.

scholarly journals A Flow-Injection Biamperometric Method for Determination of Pantoprazole in Pharmaceutical Tablets

2005 ◽  
Vol 88 (4) ◽  
pp. 1064-1068 ◽  
Author(s):  
Suzana L Castro ◽  
Osmundo D Pessoa Neto ◽  
Sergio R B Santos ◽  
Everaldo P Medeiros ◽  
Ricardo A C Lima ◽  
...  
Keyword(s):  
Standard Deviation ◽  
Relative Standard Deviation ◽  
Flow Injection ◽  
Sampling Rate ◽  
Redox Systems ◽  
Pharmaceutical Tablets ◽  
Flow Parameters ◽  
Reversible Redox ◽  
Relative Standard

Abstract A flow-injection biamperometric method for determination of pantoprazole (PTZ) in pharmaceutical tablets is reported for the first time. The reversible redox couples Fe3+/Fe2+, Fe(CN)63−/Fe(CN)64−, Ce4+/Ce3+, VO3−/VO2+, and I2/I− were tested as indicating redox systems for biamperometric determination of PTZ in a flow-injection assembly with optimized flow parameters. The best results were obtained using VO3−/VO2+, which showed to be a selective and sensitive biamperometric indicating system for PTZ even in the presence of excipients and antioxidants that typically are found in drugs. The analytical graph was linear (r = 0.99945) in the range from 10 to 100 mg/L using 25 mmol/L VO3− as the reagent and water as the carrier stream and applying 100 mV between the 2 platinum wire electrodes. The limits of detection and quantitation were 200 and 667 μg/L, respectively, with a sensibility of calibration of 22.6 mV/mg/L. The proposed method was successfully applied to determine PTZ in commercial pharmaceutical tablets with a mean relative error of 1.60% (n = 5) and mean relative standard deviation of 3.10%. Recoveries close to 100% showed good agreement between the expected amount of PTZ in tablets (40 mg) and the results found by the application of the proposed method and demonstrated that the formulations used in the tablet compositions do not interfere in the PTZ analysis. The system had good stability, with a relative standard deviation of 3.80% for 9 sequential injections of a 60 mg/L PTZ solution. A sampling rate of about 100 samples/h was obtained.

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