scholarly journals A New Indirect Sensitive and Green CFIA Method for Assay of α-cypermethrin Insecticide in Pure Form, Biological and Industrial Samples Using N-Bromo Succinamide as Oxidizing Agent in Acidic Medium

2021 ◽  
Vol 11 (4) ◽  
pp. 4033-4057
Author(s):  
Mohaned R. Mohamed ◽  
Bushra B. Qassim
Keyword(s):  
Acidic Medium ◽  
Limit Of Detection ◽  
Low Cost ◽  
Pure Form ◽  
Physical Parameters ◽  
Oxidizing Agent ◽  
Limit Of Quantification ◽  
Indirect Determination ◽  
Yellow Color ◽  
Industrial Samples

A new simple, sensistive and green environmental method of Flow-injection/merging zones technique was developed for indirect determination of α-cypermethrin pesticide in pure form, industrial and biological samples. This method based on oxidation reaction of pesticide (α-cypermethrin) with a calculated increase of N-bromosuccinamide (NBS) in acidic medium then react with Tartrazine dye (TART) and estimation of the excess of the oxidizing agent by measuring the residual absorption of TART (yellow color) at λmax = 430nm, this method is a green chemistry, low cost and less consumption of poisonous chemical reagents. The limit of detection and limit of quantification for this method are 0.05 μg.ml-1 and 0.17 μg.ml-1 respectively, RSD% = 0.69% and the recovery is about = 102.15%. Chemical and physical parameters was optimized that effect on the pesticide reaction. The calibration curve was linear within concentration range (0.5 – 30) μg.mL-1 with sampling through put is about 65 sample.hour-1; the results of determination were compared with those given by trusted method (HPLC). No significant differences between both methods regarding in terms of accuracy and precision at 95% dependability level.

Spectrophotometeric Determination of Trifluoperazine HCL in Pure Forms and Pharmaceutical Preperations

2017 ◽  
Vol 9 (5) ◽  
Author(s):  
Mohammad Hamzah Hamzah ◽  
Rawa M M Taqi ◽  
Muna M. Hasan ◽  
Raid J. M. Al-Timimi
Keyword(s):  
Standard Method ◽  
Limit Of Detection ◽  
Molar Absorptivity ◽  
Dosage Forms ◽  
Oxidizing Agent ◽  
Optimum Conditions ◽  
Limit Of Quantification ◽  
Cerium Ion ◽  
Blank Solution

A simple and accurate spectrophotometric method for the determination of Trifluoperazine HCl in pure and dosage forms was developed. The method is based on the reaction between Trifluoperazine HCl and p-chloroaniline in the presence of cerium ion as oxidizing agent which lead to the formation of violate color product that absorbed at a maximum wavelength 570nm while the blank solution was pink. Under the optimum conditions a linear relationship between the intensity and concentration of TRF in the range 4-50μg/ml was obtained . The molar absorptivity 3.74×103 L.mol-1.cm-1 , Limit of detection (2.21μg/ml), while limit of quantification was 7.39μg/ml. The proposed analytical method was compared with standard method using t-test and F-test , the obtained results shows there is no significant differences between proposed method and standard method. Based on that the proposed method can be used as an alternative method for the determination of TRF in pure and dosage forms.

UV-Visible Spectrophotometric Determination of Lambda-Cyhalothrin Insecticide in Vegetables, Soil and Water Samples

2019 ◽  
Vol 31 (1) ◽  
pp. 1-9
Author(s):  
Deepak Kumar Sahu ◽  
Joyce Rai ◽  
Chhaya Bhatt ◽  
Manish K. Rai ◽  
Jyoti Goswami ◽  
...  
Keyword(s):  
Crop Production ◽  
Limit Of Detection ◽  
Low Cost ◽  
Molar Absorptivity ◽  
Agricultural Field ◽  
Limit Of Quantification ◽  
Yellow Colour ◽  
Modern Age ◽  
Lambda Cyhalothrin

In modern age pesticide is used widely in agriculture. Lambda-cyhalothrin (LCT) is one of the most used pesticides which are used as a insecticide to kill pest, tricks, flies etc in agricultural field and it is also used for crop production. We have developed new method to detect LCT insecticide in agriculture field and reduce its uses. In this method we found the maximum absorbance at 460 nm for yellow colour dye. We also calculated limit of detection and limit of quantification 0.001 mg kg-1 and 0.056 mg kg-1 respectively. Molar absorptivity and Sandell’s sensitivity was also calculated and obtained 1.782 ×107 mol-1 cm-1 and 9.996 ×10-6 µg cm-2 respectively. The obtained yellow colour dye obeyed Beer’s law limit range of 0.5 µg ml -1 to 16 µg ml-1 in 25 ml. This method is less time consuming, selective, simple, sensitive and low cost. Present method is successfully applied in various soil, water and vegetable samples.

scholarly journals DEVELOPMENT AND VALIDATION OF UV-SPECTROPHOTOMETRIC METHOD FOR ESTIMATION OF HYDROQUINONE IN BULK, MARKETED CREAM AND PREAPARED NLC FORMULATION

2017 ◽  
Vol 9 (5) ◽  
pp. 102
Author(s):  
Sukhjinder Kaur ◽  
Taranjit Kaur ◽  
Gurdeep Kaur ◽  
Shivani Verma
Keyword(s):  
Spectrophotometric Method ◽  
Limit Of Detection ◽  
Pharmaceutical Formulations ◽  
Pure Form ◽  
Nanostructured Lipid Carrier ◽  
Limit Of Quantification ◽  
Double Beam ◽  
Uv Visible ◽  
Development And Validation

Objective: The aim of the present work was to develop a simple, rapid, accurate and economical UV-visible spectrophotometric method for the determination of hydroquinone (HQ) in its pure form, marketed formulation as well as in the prepared nanostructured lipid carrier (NLC) systems and to validate the developed method.Methods: HQ was estimated at UV maxima of 289.6 nm in pH 5.5 phosphate buffer using UV-Visible double beam spectrophotometer. Following the guidelines of the International Conference on Harmonization (ICH), the method was validated for various analytical parameters like linearity, precision, and accuracy robustness, ruggedness, limit of detection, quantification limit, and formulation analysis.Results: The obtained results of the analysis were validated statistically. Recovery studies were performed to confirm the accuracy of the proposed method. In the developed method, linearity over the concentration range of 5-40 μg/ml of HQ was observed with the correlation coefficient of 0.998 and found in good agreement with Beer Lambert’s law. The precision (intra-day and inter-day) of the method was found within official RCD limits (RSD<2%).Conclusion: The sensitivity of the method was assessed by determining the limit of detection and limit of quantification. It could be concluded from the results obtained that the purposed method for estimation of HQ in pure form, in the marketed ointment and in the prepared NLC-formulation was simple, rapid, accurate, precise and economical. It can be used successfully in the quality control of pharmaceutical formulations and for the routine laboratory analysis.

scholarly journals Determination of ?iroctone Olamine (Octopirox) in Bulk by UV Spectrophotometric Method

2017 ◽  
Vol 16 (1) ◽  
pp. 37-42
Author(s):  
Lyudmyla M Antypenko ◽  
Vitaliy A Solodovnyk
Keyword(s):  
Spectrophotometric Method ◽  
Limit Of Detection ◽  
Low Cost ◽  
Limit Of Quantification

A simple and low-cost UV-spectrophotometric method has been developed and validated for the quantification of Octopirox in bulk. The linearity was found at 307 ± 1 nm in 10-50 ?g/ml solution of ethanol-water (1:3, v:v) with r2 = 0.99. The limit of detection was found to be 1.18 µg/ml, while the limit of quantification was 3.58 µg/ml. The method was validated for linearity, accuracy, precision, range, ruggedness and robustness.Dhaka Univ. J. Pharm. Sci. 16(1): 37-42, 2017 (June)

scholarly journals Extraction of soluble sugars from green coffee beans using hot water and quantification by a chromatographic method without an organic solvent

2020 ◽  
Vol 32 (4) ◽  
pp. 242-246 ◽  
Author(s):  
Leonel Vinicius Constantino ◽  
Douglas Mariani Zeffa ◽  
Alessandra Koltun ◽  
Mariana Ragassi Urbano ◽  
Alisson Wilson Santos Sanzovo ◽  
...  
Keyword(s):  
High Performance ◽  
Chromatographic Method ◽  
Limit Of Detection ◽  
Low Cost ◽  
Soluble Sugar ◽  
Soluble Sugars ◽  
Hot Water ◽  
Green Coffee ◽  
Limit Of Quantification ◽  
Assisted Extraction

An optimal condition for extraction of soluble sugars from green coffee using water and a validated chromatographic method for its separation and quantification were proposed in this research. An orbital incubator shaker (OIS) and microwave-assisted extraction (MAE) were the 2 techniques used to extract soluble sugars. In such experiments, the variables: sample amount (300, 400, and 500 mg), time (30, 60, and 90 min), and temperature (30, 45, and 60 °C) were tested. The separation of sugars was performed in a chromatographic system (high-performance liquid chromatography refractive index detector [HPLC-RID]), which presented the selectivity for the analytes, a limit of detection of 0.020 g/L, a limit of quantification of 0.0625 g/L, and recovery rates greater than 95%. The repeatability and inter-day precision had low dispersion, RSD < 2.0% and < 3.0%, respectively. Sucrose content ranged from 0.65 to 2.39 g/L using an OIS and from 1.19 to 2.72 g/L by MAE, while glucose and fructose concentration varied from 0.08 to 0.12 g/L using both methods. The OIS technique is preferably indicated for extraction of soluble sugars at the following conditions: 500 mg of grounded green coffee, 90 min, and 60 °C. The proposed method for soluble sugar extraction and quantification may be applied in research laboratories and food industries since it is a low-cost and environment-friendly technique.

scholarly journals Ultra-low HIV-1 p24 detection limits with a bioelectronic sensor

2019 ◽  
Vol 412 (4) ◽  
pp. 811-818 ◽  
Author(s):  
Eleonora Macchia ◽  
Lucia Sarcina ◽  
Rosaria Anna Picca ◽  
Kyriaki Manoli ◽  
Cinzia Di Franco ◽  
...  
Keyword(s):  
Capsid Protein ◽  
Single Molecule ◽  
Limit Of Detection ◽  
Point Of Care ◽  
Low Cost ◽  
Wide Field ◽  
Label Free ◽  
Limit Of Quantification ◽  
Great Relevance ◽  
Hiv 1

AbstractEarly diagnosis of the infection caused by human immunodeficiency virus type-1 (HIV-1) is vital to achieve efficient therapeutic treatment and limit the disease spreading when the viremia is at its highest level. To this end, a point-of-care HIV-1 detection carried out with label-free, low-cost, and ultra-sensitive screening technologies would be of great relevance. Herein, a label-free single molecule detection of HIV-1 p24 capsid protein with a large (wide-field) single-molecule transistor (SiMoT) sensor is proposed. The system is based on an electrolyte-gated field-effect transistor whose gate is bio-functionalized with the antibody against the HIV-1 p24 capsid protein. The device exhibits a limit of detection of a single protein and a limit of quantification in the 10 molecule range. This study paves the way for a low-cost technology that can quantify, with single-molecule precision, the transition of a biological organism from being “healthy” to being “diseased” by tracking a target biomarker. This can open to the possibility of performing the earliest possible diagnosis.

scholarly journals Cell-Free DNA in Pediatric Solid Organ Transplantation Using a New Detection Method of Separating Donor-Derived from Recipient Cell-Free DNA

2020 ◽  
Vol 66 (10) ◽  
pp. 1300-1309
Author(s):  
Evgenia Preka ◽  
Drew Ellershaw ◽  
Natalie Chandler ◽  
Helena Ahlfors ◽  
Helen Spencer ◽  
...  
Keyword(s):  
Limit Of Detection ◽  
Low Cost ◽  
Recipient Cell ◽  
Solid Organ Transplantation ◽  
Organ Transplant ◽  
Solid Organ ◽  
Nucleotide Polymorphisms ◽  
Limit Of Quantification ◽  
Cell Free Dna ◽  
Free Dna

Abstract Background The use of cell-free DNA (cfDNA) as a noninvasive biomarker to detect allograft damage is expanding rapidly. However, quantifying the low fraction of donor-derived cfDNA (ddcfDNA) is challenging and requires a highly sensitive technique. ddcfDNA detection through unique donor single nucleotide polymorphisms (SNPs) is a recent new approach, however there are limited data in pediatric solid organ transplant (SOT) recipients. Methods We developed an assay using a combination of 61 SNPs to quantify the ddcfDNA accurately using a custom R script to model for both the patient and donor genotypes requiring only a single sample from the allograft recipient. Performance of the assay was validated using genomic DNA (gDNA), cfDNA and donor samples where available. Results The R “genotype-free” method gave results comparable to when using the known donor genotype. applicable to both related and unrelated pairs and can reliably measure ddcfDNA (limit of blank, below 0.12%; limit of detection, above 0.25%; limit of quantification 0.5% resulting in 84% accuracy). 159 pediatric SOT recipients (kidney, heart, and lung) were tested without the need for donor genotyping. Serial sampling was obtained from 82 patients. Conclusion We have developed and validated a new assay to measure the fraction of ddcfDNA in the plasma of pediatric SOT recipients. Our method can be applicable in any donor-recipient pair without the need for donor genotyping and can provide results in 48 h at a low cost. Additional prospective studies are required to demonstrate its clinical validity in a large cohort of pediatric SOT recipients.

scholarly journals Spectrophotometric Determination of Certain Antiepileptic's in Tablets Using Vanillin Reagent

2016 ◽  
Vol 11 (2) ◽  
pp. 3540-3551
Author(s):  
Taghreed A. Mohammed ◽  
Mona A. Mohamed
Keyword(s):  
Limit Of Detection ◽  
Low Cost ◽  
Coupling Reaction ◽  
Molar Absorptivity ◽  
Limit Of Quantification ◽  
Drug Products ◽  
Significant Difference ◽  
Student’S T ◽  
Comparison Of The Results

A selective and new spectrophotometric method is described for determination of three antiepileptic drugs; namely lamotrigine (LAM), gabapentin (GAB), and oxcarbazepine (OXC) in drug substances and in drug products using vanillin reagent as the chromogenic agent. The method is based on a coupling reaction between the cited drugs and vanillin reagent in acidic condition. Under optimized conditions, the yellow colored products were measured at 405, 396, and 400 nm respectively. Beer’s law was obeyed at (0.4 – 10), (0.1-10), and (0.5-11) μg/mL, and  the calculated molar absorptivity values are 2.52 x 104, 1.74 x 104, and 2.54 x 104 L/mol/cm for LAM, GAB, and OXC respectively. Sandell sensitivity, the limit of detection (LOD) and limit of quantification (LOQ) were calculated. No interference was observed from common additives found in drug products. The presented method was validated according to ICH guidelines. Statistical comparison of the results was performed using Student's t-test and F-ratio at 95% confidence level, and there was no significant difference between the reference and proposed method with regard to accuracy and precision. The method offers the advantages of rapidity, simplicity and sensitivity and low cost and can be easily applied to resource poor settings without the need for expensive instrumentation and reagents.

scholarly journals Colorimetric Determination of Nitrate after Reduction to Nitrite in a Paper-Based Dip Strip

2021 ◽  
Vol 5 (1) ◽  
pp. 9
Author(s):  
Amer Charbaji ◽  
Hojat Heidari-Bafroui ◽  
Nasim Rahmani ◽  
Constantine Anagnostopoulos ◽  
Mohammad Faghri
Keyword(s):  
Limit Of Detection ◽  
Point Of Care ◽  
Low Cost ◽  
Colorimetric Detection ◽  
Water Quality Monitoring ◽  
Colorimetric Determination ◽  
Limit Of Quantification ◽  
Point Of Care Diagnostics ◽  
Reduction Efficiency ◽  
Nitrate And Nitrite

Paper-based microfluidic technology is a relatively new field of research that provides low-cost platforms and sensors for point-of-care diagnostics. While the majority of research in this field has been for biomedical applications, more and more paper-based devices and platforms are being designed and developed for environmental applications, such as water quality monitoring and assessment. One such application is the detection of nitrate in water samples. Colorimetric detection of nitrate by paper-based devices using the Griess assay requires the reduction of nitrate to nitrite before undergoing the reaction. In this paper, we measured the performance of a paper-based dip strip for detecting nitrate and nitrite by calculating its limit of detection and limit of quantification. We also calculated the reduction efficiency of vanadium (III) chloride in the dip strip for detecting nitrate. Our results show that the reduction time of nitrate via vanadium (III) chloride is much longer than that when using zinc microparticles. Our results also show that the performance of the dip strip using vanadium (III) chloride for nitrate detection is not as good as more intricate paper-based devices that have a separate reaction zone with zinc microparticles. The limits of detection and quantification calculated were 3.352 and 7.437 ppm, and the nitrate reduction efficiency varied over the range of nitrate concentrations tested.

scholarly journals Determination of Fenpyroximate Acaricide in Vegetables, Soil and Water Samples using UV-Visible Spectroscopy

2020 ◽  
Vol 32 (8) ◽  
pp. 1991-1995
Author(s):  
D.K. Sahu ◽  
C. Bhatt ◽  
J. Rai ◽  
M.K. Rai ◽  
J. Goswami ◽  
...  
Keyword(s):  
Water Samples ◽  
Azo Dye ◽  
Limit Of Detection ◽  
Low Cost ◽  
Crop Productivity ◽  
Molar Absorptivity ◽  
Spectrophotometric Analysis ◽  
Human Beings ◽  
Limit Of Quantification ◽  
Soil And Water

Modern agriculture makes use of chemical pesticides to increase the crop productivity so as to meet the daily needs of uncontrolled population growth. These increase the productivity neglecting the fertility of soil and food quality, hence risking the health of human beings including animals. Fenpyroximate is a kind of acaricide which attacks and kills mites and decreases the growth of larvae. A method is established for the detection of fenpyroximate and stop excessive use of pesticide. After performing several tests on various wavelengths, the λmax for the detection of fenpyroximate was 435 nm for azo dye. Limit of detection (LOD) and limit of quantification (LOQ) was found to be 0.687 μg mL-1 and 2.083 μg mL-1, respectively. Furthermore, molar absorptivity, Sandell′s sensitivity were calculated to be 2.3 × 10-7 mol-1 cm-1 and 1 × 10-5 μg cm-2, respectively. The azo dye follows Beer′s law in the range 5 μg to 14 μg in 10 mL that can be easily detected by using spectrophotometric analysis. This method is very sensitive, low cost and less time consuming. The present method is applied successfully in various vegetables (i.e. apple, cucumber, potato, spinach, etc.) soil and water samples.

Sign in / Sign up

Export Citation Format

Share Document