Rapid chromite dissolution using manganese dioxide-lithium-sulphate-sulphuric acid mixture-estimation of alumina in chromite for quality control assessment

1996 ◽  
Vol 122 (3-4) ◽  
pp. 167-173 ◽  
Author(s):  
Partha Chattopadhyay ◽  
Mritunjoy Mistry
Keyword(s):  
Quality Control ◽  
Manganese Dioxide ◽  
Sulphuric Acid ◽  
Acid Mixture ◽  
Lithium Sulphate

Renewable Sugars Hydrolyzed from Banana Pseudo-Stem Using Different Chemical Pretreatments

2013 ◽  
Vol 372 ◽  
pp. 97-100 ◽  
Author(s):  
Mohammad Aisah ◽  
Surip Siti Norasmah ◽  
Ibrahim Wan Asma
Keyword(s):  
Hydrogen Peroxide ◽  
Sodium Hydroxide ◽  
Sulphuric Acid ◽  
Plant Cell Wall ◽  
Biofuel Production ◽  
Acid Mixture ◽  
Natural Material ◽  
Hydrolysis Time ◽  
Chemical Pretreatments ◽  
Renewable Sugars

Cellulose and hemicelluloses are the main building block of plant cell wall and are known as a natural polymer that usually used in the industries. Cellulose and hemicelluloses could be used as a feedstock for second generation biofuel production where it is subjected to hydrolysis into sugar after which it can be converted into bioethanol through fermentation process. In this study, the matured banana pseudo-stem is used as the source of hydrolyzing sugar from natural material. The objective of this research is to study the effects of different chemical pretreatments (sodium hydroxide, mixture of sodium hydroxide and hydrogen peroxide, sulphuric acid, mixture of sulphuric acid and hydrogen peroxide) and hydrolysis time (1-5 hours) on the sugar yield from banana pseudo-stem. Results showed that, after 3 hours hydrolysis most of the sugars from all chemical pretreatments reduced gradually. Analysis of sugar contents from acid hydrolysis process using High Pressure Liquid Chromatography (HPLC) showed that all the samples contained glucose, xylose, and arabinose where the highest glucose (16.02 mg/L) obtained from fiber treated with mixture of 1.0 M sulphuric acid and hydrogen peroxide. In addition, both highest xylose (64.23 mg/L) and arabinose (45.78 mg/L) are obtained from fiber treated with 0.5 M sodium hydroxide.

Pyrimidine Derivatives and Related Compounds, VII Synthesis of Some New Pyrazolo [1,5-a] -S-triazines, Pyrazolo [3,4-c] -as-triazines, Pyrazolo [1,5-a] pyrimidines and Pyrazolo [3,4-b] pyrones

1977 ◽  
Vol 32 (4) ◽  
pp. 430-433 ◽  
Author(s):  
Mohamed Hilmy Elnagdi ◽  
Ezzat Mohamed Zayed ◽  
Ezzat Mohamed Kandeel ◽  
Sherif Mahmoud Fahmy
Keyword(s):  
Acetic Acid ◽  
Hydrochloric Acid ◽  
Sulphuric Acid ◽  
Sodium Ethoxide ◽  
Ethyl Acrylate ◽  
The Other ◽  
Acid Mixture ◽  
Pyrimidine Derivatives ◽  
Triazine Derivative ◽  
Related Compounds

3-Amino-4-phenylhydrazono-2-pyrazolin-5-one (1) reacts with isothiocyanate to yield the corresponding pyrazolylthiourea derivatives (2 a-c). Whereas 2 a reacted with hydrazines to yield the pyrazolylamino-1,2,4-triazoles (3 a, b), it cyclised into the pyrazolo-[3,4-e]-as-triazine derivative (4) upon treatment with concentrated sulphuric acid. On the other hand, the pyrazolo[1,5-c]-S-triazine derivative (5) was formed from reaction of 2a with ethanolic sodium ethoxide.3-Amino-2-pyrazolin-5-one (8) reacted with ethyl acrylate to yield a mixture of the 4-dialkylated derivative (9) and the pyrazolo[3,4-b]pyrone (11). Compound 11 could be converted into the corresponding pyrazolo[3,4-b]pyrones (12) and (13) by the action of acetic acid hydrochloric acid mixture and of concentrated sulphuric acid, respectively.

Probing the electrochemical properties of biopolymer modified EMD nanoflakes through electrodeposition for high performance alkaline batteries

2016 ◽  
Vol 45 (13) ◽  
pp. 5557-5567 ◽  
Author(s):  
Avijit Biswal ◽  
Manickam Minakshi ◽  
Bankim Chandra Tripathy
Keyword(s):  
Electrochemical Properties ◽  
Manganese Dioxide ◽  
Sulphuric Acid ◽  
High Performance ◽  
Cross Linking ◽  
Alkaline Batteries ◽  
Manganese Sulphate ◽  
Acid Bath

A novel biopolymer approach has been made to electrodeposit manganese dioxide from manganese sulphate in a sulphuric acid bath containing chitosan in the absence and presence of glutaraldehyde as a cross-linking agent.

scholarly journals PERANCANGAN SISTEM PENGENDALIAN KUALITAS PRODUK ASAM SULFAT (STUDI KASUS : PT. XYZ)

2017 ◽  
Vol 5 (3) ◽  
Author(s):  
Juliani Sutikno
Keyword(s):  
Quality Control ◽  
Product Quality ◽  
Sulphuric Acid ◽  
Control Charts ◽  
Quality Standard ◽  
Raw Material ◽  
National Standard ◽  
Acid Product ◽  
Quality Control Standard ◽  
Product Specifications

<p>PT. XYZ is a basic chemical manufacturing company which produces sulphuric acid. Quality<br />standard are reffered to National Standard of Indonesia (SNI). PT. XYZ has certified the use of SNI<br />standard for sulphurid acid product quality. Quality control of product is supervised by technician from<br />PT. XYZ to ensure that only products that meet acceptable standard of quality which may be delivered<br />to customer in order to ensure customer satisfaction. PT. XYZ establish product specifications sulphuric<br />acid in the production process with a concentration of at least 98,5%. Determination of sulphuric acids<br />product specification targets are too high from the referenced standard is loss and optimal quantity of<br />product produced. This study aims to measure the process capability and product specifications of<br />sulphuric acid establishes the right to increase the quantity of products. And then, Designing an<br />appropriate system to control product quality sulphuric acid which has been determined. Determination<br />of the specifications made by processing the sulphuric acids inspection levels. Processing data using<br />analytical tools of quality control, histogram charts, control charts, and a causal diagram. Result of<br />the analysis compared to the quality control standard established by BSN through SNI 0030:2011.<br />From the comparison of the data will be used to set quality standard appropriate levels of sulphuric<br />acid. Quality control system design sulphuric acid starts from the selection of raw material supplier,<br />controlling during the setting process until the sulphuric acid concentration through dilution water.</p>

Studies on condensed pyrazoles: Synthesis of new methyl and amino pyrazolo[1,5-a]pyrimidines and of pyrazolo[5,1-c][1,2,4]triazines

1989 ◽  
Vol 54 (4) ◽  
pp. 1082-1091 ◽  
Author(s):  
Mohamed Hilmy Elnagdi ◽  
Nadia Hassen Taha ◽  
Fatma Abdel Maksoud Abd El All ◽  
Ramadan Maawad Abdel-Motaleb ◽  
Fivian Farouk Mahmoud
Keyword(s):  
Acetic Acid ◽  
Sulphuric Acid ◽  
Acid Mixture ◽  
H Nmr ◽  
Active Methylene

A variety of 3-arylazo 5-amino and 7-aminopyrazolo[1,5-a]pyrimidines were obtained via reacting Ia-Id with cinnamonitriles. The structure of products was confirmed via 1H NMR. Both 5-amino- and 7-amino-3-arylazo pyrazolo[1,5-a]pyrimidines reacted, with protons in acetic acid-sulphuric acid mixture to yield the corresponding 3-unsubstituted acetylaminopyrazolo[1,5-a]pyrimidines. Diazotized Ia and Ib coupled with a variety of active methylene reagents to yield pyrazolo[5,1-c][1,2,4]triazines.

A Reliable HPLC-ELSD Method for Determination of Cholesterol, Phosphatidylcholine, Lysophosphatidylcholine Content and the Stability of a Liposomal Formulation

2020 ◽  
Vol 16 (5) ◽  
pp. 623-632
Author(s):  
Naiara Ieza Gallo de Magalhães Benedetti ◽  
Danillo Fabrini Maciel Costa Veloso ◽  
Thais Leite Nascimento ◽  
Danielle Guimarães Almeida Diniz ◽  
Lorena Maione-Silva ◽  
...  
Keyword(s):  
Quality Control ◽  
Limit Of Detection ◽  
Phospholipid Composition ◽  
High Specificity ◽  
Gradient Elution ◽  
Stability Study ◽  
Acid Mixture ◽  
Wide Range ◽  
Quality Control Tool ◽  
The Stability

Background:Liposomes continue to play an important role in drug delivery research due to their ability to improve transport and targeting of a wide range of active molecules. Analysis of liposomal components is a key point in the characterization and evaluation of formulation stability. The aim of this work was to develop and validate an HPLC-ELSD method for the characterization and quality control of liposomes.Methods:HPLC-ELSD method was validated by assessing selectivity, linearity, precision, accuracy, limit of detection and quantitation. The mobile phase consisted of a 0.1% (v/v) of trifluoroacetic acid (TFA) and methanol in gradient elution. Initial rate was 20:80 (0.1% TFA: methanol), with a ramp reaching 100% methanol. HPLC-MS/MS was used to confirm the presence of the fatty acid mixture in the analyzed lipids, as well as sub-products generated under pre-determined conditions in the stability study.Results:A HPLC-ELSD method has been developed to detect and measure cholesterol, phosphatidylcholine and lysophosphatidylcholine. High specificity, sensitivity and linearity within the predetermined range for all the compounds analyzed (R2>0.99) were obtained. Accuracy and precision results for all the compounds were within the acceptance limit of ≤5% and 90-110%, respectively. Mass spectrometry results showed complementary information about the phospholipid composition to evaluate the degree of degradation of liposomes over different storage conditions.Conclusion:The method was successfully applied as a quality control tool for the analysis of a wide range of lipids, present in liposomal formulations. HPLC-MS/MS was used to ensure complete elucidation of the lipid components and the detected lyso-forms.

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