A simple and cost effective method for determination of the self-accelerating decomposition temperature

2013 ◽  
Vol 32 (2) ◽  
pp. 136-139
Author(s):  
Hans K. Fauske
Keyword(s):  
Cost Effective ◽  
Decomposition Temperature ◽  
The Self ◽  
Cost Effective Method

scholarly journals Synchronous fluorescence as a green and selective tool for simultaneous determination of bambuterol and its main degradation product, terbutaline

2018 ◽  
Vol 5 (10) ◽  
pp. 181359 ◽  
Author(s):  
Samah Abo El Abass ◽  
Heba Elmansi
Keyword(s):  
Degradation Product ◽  
Low Cost ◽  
Reference Method ◽  
Cost Effective ◽  
Zero Crossing ◽  
Cost Effective Method ◽  
Validation Parameters ◽  
Main Degradation Product ◽  
20 Nm

A green, sensitive and cost-effective method is introduced in this research for the determination of bambuterol and its main degradation product, terbutaline, simultaneously, relying on the synchronous spectrofluorimetric technique. First derivative synchronous spectrofluorimetric amplitude is measured at Δ λ = 20 nm, so bambuterol can be quantitated at 260 nm, and terbutaline can be measured at 290 nm, each at the zero crossing point of the other. The amplitude–concentration plots were linear over the concentration ranges of 0.2–6.0 µg ml −1 and 0.2–4.0 µg ml −1 for both bambuterol and terbutaline, respectively. Official guidelines were followed to calculate the validation parameters of the proposed method. The low values of limits of detection of 0.023, 0.056 µg ml −1 and limits of quantitation of 0.071, 0.169 µg ml −1 for bambuterol and terbutaline, respectively, point to the sensitivity of the method. Bambuterol is a prodrug for terbutaline, and the latter is considered its degradation product so the established method could be regarded as a stability-indicating one. Moreover, the proposed method was used for the analysis of bambuterol and terbutaline in their single ingredient preparations and the results revealed statistical agreement with the reference method. The suggested method, being a simple and low-cost procedure, is superior to the previously published methods which need more sophisticated techniques, longer analysis time and highly toxic solvents and reagents. It could be considered as an eco-friendly analytical procedure.

scholarly journals Facile Fabrication of Biochar from Palm Kernel Shell Waste and Its Novel Application to Magnesium-Based Materials for Hydrogen Storage

Materials ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 625 ◽  
Author(s):  
Martin Luther Yeboah ◽  
Xinyuan Li ◽  
Shixue Zhou
Keyword(s):  
Hydrogen Storage ◽  
Palm Kernel ◽  
Cost Effective ◽  
Ambient Air ◽  
Decomposition Temperature ◽  
Scanning Calorimetry ◽  
Experimental Conditions ◽  
Palm Kernel Shell ◽  
Cost Effective Method ◽  
Facile Fabrication

In this investigation, an easily-operated and cost-effective method is utilized to synthesize biochar in ambient air, and the prepared biochar is used in a novel manner as a milling aid for fabricating Mg-biochar composites for hydrogen storage. X-ray diffractometry reveals that increasing the content of palm kernel shell biochar (PKSBC) from 5 wt.% to 20 wt.% enhances the hydrogen absorption performance by increasing the conversion of Mg into MgH2 from 83% to 93%. A 40 °C reduction in decomposition temperature of MgH2 is recorded from differential scanning calorimetry curves when the content of PKSBC is increased to 20 wt.%. Magnesium is milled and hydrided under the same experimental conditions and used as a reference material. It is proposed that these property enhancements can be attributed to the fact that PKSBC acts as an anti-sticking agent for elemental Mg powders, helping in the achievement of a more dispersed composite with reduced Mg particle size due to its layered-like carbon structure.

Comparative Study on TiH2 and CaCO3 for Fabrication of Mg Alloy Foams

2008 ◽  
Vol 569 ◽  
pp. 273-276 ◽  
Author(s):  
Chang Hwan Seo ◽  
M. J. Jeong ◽  
In Young Jung ◽  
Bo Young Hur
Keyword(s):  
Metal Foam ◽  
High Strength ◽  
Cost Effective ◽  
Decomposition Temperature ◽  
Mg Alloy ◽  
New Materials ◽  
Alloying Element ◽  
Blowing Agent ◽  
Economic View ◽  
Cost Effective Method

Aluminum alloy foams, new materials belonging to a special class of porous materials, have been prepared using melt foaming method. Silicon was chosen alloying element due to its low density, high strength, effective casting and reduced shrinkage. Melt foaming method is cost-effective method to fabricate metal foam. Usually, TiH2 is applied to blowing agent, but its cost is high. CaCO3 is one of candidates to substitute TiH2 in the economic view-point. For the comparison of formability, Mg alloy foams were prepared by TiH2 and CaCO3. However, the decomposition temperature of CaCO3 is higher than that of TiH2. This paper will be discussed on the possible usage of CaCO3 in the Al melt.

A simple, fast and cost effective method for detection and determination of dopamine in bovine serum

2011 ◽  
Vol 3 (6) ◽  
pp. 1405 ◽  
Author(s):  
Abdolkarim Abbaspour ◽  
Hamed Valizadeh ◽  
Abdolreza Khajehzadeh
Keyword(s):  
Bovine Serum ◽  
Cost Effective ◽  
Cost Effective Method

scholarly journals An improved method to determine neutron fluence in high energy medical accelerators using activation detectors

2019 ◽  
Vol 26 ◽  
pp. 239
Author(s):  
K. Papadopoulos ◽  
G. Siltzovalis ◽  
M. I. Savva ◽  
T. Vasilopoulou ◽  
P. Georgolopoulou ◽  
...  
Keyword(s):  
Cross Section ◽  
Neutron Fluence ◽  
Cost Effective ◽  
High Energy ◽  
Monte Carlo Code ◽  
External Diameter ◽  
Cross Section Data ◽  
Section Data ◽  
Cost Effective Method

Scope of the present work was to test the hypothesis that a generic simulation geometry can adequately describe a high energy medical accelerator head for the purpose of estimating the parasitic neutron fluence levels at the position of the isocenter. The experiment was performed using an Elekta Synergy 18 MV linear accelerator. Gold, cobalt, indium and copper activation foils were used. Activation measurements were performed using a calibrated HPGe detector based spectrometry system. Four generic accelerator head models were considered. Neutron spectrum averaged cross-section data for each foil were derived for the examined configurations using the Monte Carlo code MCNP5 in conjuction with cross section data obtained from the International Reactor Dosimetry and Fusion File (IRDFF). It was concluded that the accelerator head can be adequately described either as a solid tungsten sphere of 10 cm radius or a spherical tungsten shell 20 cm in external diameter and 10 cm in thickness. This work contributes towards the development of a simple and computationally cost effective method for the determination of neutron fluence around high energy medical accelerators and therefore the optimization of the radiation protection of the patients and staff in radiation therapy.

scholarly journals Eco-friendly ultraviolet spectrophotometric methods for the determination of clotrimazole and tinidazole in bulk and ointment dosage form

2022 ◽  
Vol 11 (1) ◽  
pp. 11-22 ◽  
Author(s):  
Kanaka Parvathi Kannaiah ◽  
Abimanyu Sugumaran
Keyword(s):  
Dosage Form ◽  
Evaluation Studies ◽  
Cost Effective ◽  
Environmental Safety ◽  
Assessment Tools ◽  
Visible Range ◽  
Spectrophotometric Methods ◽  
Cost Effective Method ◽  
Stock Solutions

Analyzing a drug over its overlapped spectra utilizes sophisticated instruments and more toxic solvents, which has a deleterious effect on environmental safety. There is an alarming need to develop a simple, novel, and cost-effective method for determining combined substances that are non-toxic to the environment. So, the study aimed to develop four simple, fast and eco-friendly spectrophotometric techniques for quantifying clotrimazole and tinidazole in bulk and ointment dosage form. Stock solutions produced at concentrations of 7 to 13 and 17.5 to 32.5 µg/mL of clotrimazole and tinidazole in 10% v/v ethanol and scanned in the UV-visible range 200-450 nm, and used for all methods. The methods were validated according to the International Council for Harmonization guidelines and found to be within limits. Additionally, the outliers were tested by using the Grubbers test and found within limits. Finally, green evaluation studies show that the method is more environmentally friendly, as confirmed by four assessment tools.

scholarly journals Theoretical Determination of Rate Constants from Excited-States: Application to Benzophenone

2021 ◽  
Author(s):  
Katsuyuki Shizu ◽  
Hironori Kaji
Keyword(s):  
Excited States ◽  
Rate Constants ◽  
Density Functional ◽  
Golden Rule ◽  
Density Functional Theory Calculations ◽  
Cost Effective ◽  
Functional Theory ◽  
Constant Determination ◽  
Cost Effective Method

A cost-effective method of theoretically predicting electronic transition rate constants from the excited-states of molecules is reported. This method is based on density functional theory calculations of electronic states and quantitative rate constant determination with the Fermi golden rule.

scholarly journals Flavonoid Quantification in Onion by Spectrophotometric and High Performance Liquid Chromatography Analysis

HortScience ◽  
2002 ◽  
Vol 37 (4) ◽  
pp. 682-685 ◽  
Author(s):  
Kevin A. Lombard ◽  
Emmanuel Geoffriau ◽  
Ellen Peffley
Keyword(s):  
High Performance Liquid Chromatography ◽  
Liquid Chromatography ◽  
High Performance ◽  
Hplc Analysis ◽  
Correlation Coefficients ◽  
Cost Effective ◽  
Chromatography Analysis ◽  
Cost Effective Method ◽  
Performance Liquid Chromatography Analysis

Direct spectrophotometric determination of quercetin content in onions (Allium cepa L.) was investigated as a possible alternative to high-performance liquid chromatography (HPLC) analysis. Quercetin content in five onion varieties was monitored at 362 nm and quantified using simple spectrophotometric and HPLC methods. HPLC revealed that 3,4'-Qdg and 4'-Qmg comprised up to 93% of total flavonol content detected in the studied varieties. These major quercetin conjugates combined (3,4'-Qdg + 4'-Qmg) and total flavonol conjugates quantified by HPLC correlated closely with spectrophotometer values. Correlation coefficients were 0.96 (P < 0.0001) for 3,4'-Qdg + 4'-Qmg and 0.97 (P < 0.0001) for total flavonol conjugates in onion. Simple spectrophotometric procedure proved to be a valid, efficient, and cost-effective method for the quantification of total quercetin in onion. Chemical names used: quercetin-3,4'-O-diglucoside (3,4'-Qdg); quercetin-4'-O-glucoside (4'-Qmg).

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