scholarly journals Development of L-phenylalanine biosensor and its application in the real samples

2013 ◽  
pp. 1-23 ◽  
Author(s):  
Z A Mangombo ◽  
D Key ◽  
E I Iwuoha ◽  
P G L Baker
Keyword(s):  
Real Samples ◽  
The Real

scholarly journals MONITORING OF MANCOZEB PESTICIDE ON THE GROUND UNDER SYSTEMS CONVENTIONAL OF TOMATO SEEDING

2009 ◽  
Vol 06 (12) ◽  
pp. 19-24
Author(s):  
Maria Elena ARCANJO ◽  
Mônica Regina da Costa MARQUES ◽  
Daniel Vidal PÉREZ
Keyword(s):  
Carbon Disulfide ◽  
Rio De Janeiro ◽  
Real Samples ◽  
The Real ◽  
Pesticide Monitoring ◽  
Conventional Systems

The work aimed to evaluate Mancozeb® pesticide monitoring on the ground of tomato seeding using the methodology of decomposition of dithiocarbamates (DTCs) with carbon disulfide (CS2) generation. It was possible to evidence Mancozeb® content in the real samples (7.44 mg.kg-1) proceeding from an area cultivated with tomato, in São Jose de Ubá city (Rio de Janeiro), under Conventional systems of seeding.

scholarly journals Fast and Environment-Friendly GC-MS Method for Eleven Organophosphorus Flame Retardants in Indoor Air, Dust, and Skin Wipes

Toxics ◽  
2021 ◽  
Vol 9 (12) ◽  
pp. 350
Author(s):  
Chung-Yu Chen ◽  
Yu-Hsuan Liu ◽  
Chia-Hui Chieh ◽  
Wei-Hsiang Chang
Keyword(s):  
Indoor Air ◽  
House Dust ◽  
Polybrominated Diphenyl Ethers ◽  
Flame Retardants ◽  
Standard Addition ◽  
Cost Effective ◽  
Extraction Methods ◽  
Indoor Environments ◽  
Real Samples ◽  
The Real

Organophosphorus based flame retardants (OPFRs) extensively used as alternatives to banned polybrominated diphenyl ethers and hexabromocyclododecane have been garnering interest due to the possibility that these compounds may have less significant impact on human and environmental health. Long pretreatment time, larger consumption of organic solvents, matrix interferents, and cross-contamination were found in previous studies while assessing OPFRs in indoor environments. We developed and optimized the extraction methods and simultaneous analysis of 11 OPFRs in indoor air, dust and skin wipe samples using the GC-MS approach. The proposed methods were validated using a standard addition approach, dust SRM 2585 and the real samples. Our procedures enabled the analyst to effectively limit coextracted interferences and simultaneous analytical methods of 11 target OPFRs for three matrices were achieved. The validation was performed according to standard guidelines (relative errors were identified by the analytes: −19% to 18% for indoor air, −11% to 14% for house dust, −15% to 16% for skin wipe). Good practices for quality assurance and quality control were well stated. The current high-Eco-scored methods could be categorized as “an excellent green analysis”. All analytes for the target OPFRs were detected in the real samples of indoor air, house dust and skin wipe collected from ten Taiwanese homes. Tris(2-butoxyethyl) phosphate, tris(1,3-dichloro-2-propyl)phosphate and tris(chloroisopropyl) phosphate were the most abundant OPFRs. Rapid, green and cost-effective GC-MS methods were developed and validated for the analysis of eleven OPFRs in indoor air, house dust and skin wipes.

Comparison of Column Solid-Phase Extraction Procedures for Spectrophotometric Determination of E129 (Allura Red) in Foodstuff, Pharmaceutical, and Energy Drink Samples

2015 ◽  
Vol 98 (4) ◽  
pp. 946-952 ◽  
Author(s):  
Abdullah Taner Bişgin ◽  
Mustafa Uçan ◽  
İbrahim Narin
Keyword(s):  
Adsorption Isotherm ◽  
Spectrophotometric Determination ◽  
Solid Phase ◽  
Energy Drink ◽  
Sample Volume ◽  
Linear Calibration ◽  
Real Samples ◽  
The Real ◽  
Allura Red

Abstract Two novel spectrophotometric determination procedures based on retention of Allura Red onto Amberlite XAD-1180 and XAD-16 resins for its preconcentration, purification, and separation were developed. Analytical parameters of the methods including pH, eluent type, sample volume, and sample and eluent flow rates, were investigated and optimized. Interference effects of some cations, anions, and widely used food dyes were also investigated. Detection limits of the two methods were found to be 1.2 and 1.5 μg/L for XAD-1180 and XAD-16 columns, respectively, under optimum conditions. Linear calibration curve ranges of the methods were 0.4–8.0 and 0.5–6.0 μg/mL of Allura Red for XAD-1180 and XAD-16 resins, respectively. Preconcentration factors were found as 80 for both the XAD-1180 and XAD-16 columns using maximum sample volume and minimum eluent volume. RSDs of the methods were below 6% throughout all experiments. All absorbance measurements were performed at 506 nm. Validations of the methods were performed comparatively with determination of the Allura Red contents of some foodstuff, pharmaceutical, and energy drink samples. Allura Red concentrations in investigated solid and liquid samples ranged from 298 to 501 μg/g and 53.8 to 508 μg/mL, respectively. Satisfactory results were obtained from the real samples analysis. Allura Red contents of samples were determined to be highly similar using the two extraction methods. Comparisons of the methods were performed by analysis of Allura Red contents of the real samples. In addition to analytical parameters, adsorption isotherm studies were performed for the two kinds of Amberlite resins. It was observed that developed methods fit the linear form of the Freundlich adsorption isotherm model. All of the experimental results suggested that the developed SPE procedures are suitable for separation, preconcentration, and determination of Allura Red in solid and liquid matrixes.

Design of a novel optical sensor for determination of trace amounts of copper by UV/vis spectrophotometry in the real samples

2015 ◽  
Vol 26 ◽  
pp. 370-374 ◽  
Author(s):  
Eslam Pourbasheer ◽  
Somayeh Morsali ◽  
Alireza Banaei ◽  
Sajjad Aghabalazadeh ◽  
Mohammad Reza Ganjali ◽  
...  
Keyword(s):  
Optical Sensor ◽  
Real Samples ◽  
The Real

scholarly journals Analysis of the dimensions of desks in primary schools in Aerodrom Municipality - Skopje

2021 ◽  
Vol 1208 (1) ◽  
pp. 012027
Author(s):  
Elena Jevtoska ◽  
Gjorgi Gruevski ◽  
Ivana Antovska ◽  
Marija Krstev
Keyword(s):  
Primary Schools ◽  
Growth And Development ◽  
Educational Institutions ◽  
Real Condition ◽  
Real Samples ◽  
The Real

Abstract Educational institutions are facilities where each person spends many years of their life. Desks used in these institutions are designed with specific features of shape, material and size. Long-term use of desks in educational institutions may be the cause of damage to the health of users if they are not carefully designed and dimensioned. In compliance with the prescribed rules and dimensions in the design of desks it is of great importance for proper development of the users that are in the stage of growth and development when using this type of desk. In this paper, the functional dimensions of real samples of desks taken from primary schools in the Municipality of Aerodrom – Skopje will be measured. The testing samples of desks will be designated to the group that they belong to according to the EN 1729-1:2006 standard, and all requested dimensions according to the standard will be measured. The purpose of this work is to show the real condition of desks in primary schools and whether the desks are with the requested dimensions of the EN 1729-1:2006 standard.

scholarly journals Improving GAN with Neighbors Embedding and Gradient Matching

2019 ◽  
Vol 33 ◽  
pp. 5191-5198
Author(s):  
Ngoc-Trung Tran ◽  
Tuan-Anh Bui ◽  
Ngai-Man Cheung
Keyword(s):  
Generative Adversarial Networks ◽  
New Techniques ◽  
Real Samples ◽  
The Real ◽  
Local Structures ◽  
Adversarial Networks ◽  
The Difference ◽  
A New Technique ◽  
Discriminator Function

We propose two new techniques for training Generative Adversarial Networks (GANs) in the unsupervised setting. Our objectives are to alleviate mode collapse in GAN and improve the quality of the generated samples. First, we propose neighbor embedding, a manifold learning-based regularization to explicitly retain local structures of latent samples in the generated samples. This prevents generator from producing nearly identical data samples from different latent samples, and reduces mode collapse. We propose an inverse t-SNE regularizer to achieve this. Second, we propose a new technique, gradient matching, to align the distributions of the generated samples and the real samples. As it is challenging to work with high-dimensional sample distributions, we propose to align these distributions through the scalar discriminator scores. We constrain the difference between the discriminator scores of the real samples and generated ones. We further constrain the difference between the gradients of these discriminator scores. We derive these constraints from Taylor approximations of the discriminator function. We perform experiments to demonstrate that our proposed techniques are computationally simple and easy to be incorporated in existing systems. When Gradient matching and Neighbour embedding are applied together, our GN-GAN achieves outstanding results on 1D/2D synthetic, CIFAR-10 and STL-10 datasets, e.g. FID score of 30.80 for the STL-10 dataset. Our code is available at: https://github.com/tntrung/gan

scholarly journals A Green RP-HPTLC-Densitometry Method for the Determination of Diosmin in Pharmaceutical Formulations

Processes ◽  
2020 ◽  
Vol 8 (7) ◽  
pp. 817 ◽  
Author(s):  
Ahmed I. Foudah ◽  
Prawez Alam ◽  
Md. Khalid Anwer ◽  
Hasan S. Yusufoglu ◽  
Maged S. Abdel-Kader ◽  
...  
Keyword(s):  
Biological Fluids ◽  
Pharmaceutical Formulations ◽  
Reversed Phase ◽  
Pharmaceutical Products ◽  
Green Solvents ◽  
Real Samples ◽  
The Real ◽  
Hptlc Method ◽  
Spray Dried

Green analytical technologies for the determination of a bioactive compound diosmin (DIOM) in the real samples of pharmaceutical formulations and biological fluids are scarce in literature. Therefore, the present investigation was carried out to develop a novel, rapid, simple, and economical green “reversed phase high-performance thin-layer chromatography (RP-HPTLC)” method for the determination of DIOM in commercial tablets and in-house developed spray-dried microparticles (MPs). The quantification of DIOM was conducted via “RP-18 silica gel 60 F254S HPTLC plates”. The binary combination of green solvents, i.e., ethanol:water (5.5:4.5 v/v) was proposed as a green mobile phase. The analysis of DIOM was conducted in absorbance/reflectance mode of densitometry at λmax = 348 nm. The densitograms of DIOM from the commercial tablets and in-house developed spray-dried MPs were verified by recording their single band at Rf = 0.80 ± 0.02 compared to standard DIOM. Green RP-HPTLC method was observed as linear in the range of 100–700 ng/band with R2 = 0.9995. The proposed method was found as “accurate, precise, robust, and sensitive” for the determination of DIOM in the real samples of commercial tablets and in-house developed spray-dried MPs. The % content of DIOM in the real samples of commercial tablets and in-house developed spray-dried MPs was obtained as 99.06 and 101.30%, respectively. The recorded results of this research suggested that the green RP-HPTLC method can be effectively used for the routine analysis of DIOM in pharmaceutical products.

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