scholarly journals Determination of the naturally occurring vanadium-complex amavadin in Amanita muscaria with HPLC-ICPMS

2021 ◽  
Author(s):  
Simone Braeuer ◽  
Martin Walenta ◽  
Lorenz Steiner ◽  
Walter Goessler
Keyword(s):  
Vanadium Complex ◽  
Amanita Muscaria ◽  
Naturally Occurring

The determination of the two isomers of amavadin and other V species in Amanita muscaria with HPLC-ICPMS.

Optimization of the selection of analysis methods for the determination of naturally occurring radionuclides

Kerntechnik ◽  
2008 ◽  
Vol 73 (3) ◽  
pp. 118-121
Author(s):  
T. Heinrich ◽  
L. Funke ◽  
M. Köhler ◽  
U.-K. Schkade ◽  
F. Ullrich ◽  
...  
Keyword(s):  
Naturally Occurring ◽  
Analysis Methods ◽  
Naturally Occurring Radionuclides ◽  
Selection Of

Comparative Study for the Assay of Plant Derived Chemicals in Pharmaceutical Formulation Using Methods Dependent on Factorized Spectra

2021 ◽  
Author(s):  
Nesma M Fahmy ◽  
Adel M Michael
Keyword(s):  
Pharmaceutical Formulations ◽  
Pharmaceutical Formulation ◽  
Ternary Mixtures ◽  
Ratio Method ◽  
The Novel ◽  
Naturally Occurring ◽  
Accuracy And Precision ◽  
Validation Parameters ◽  
Significant Difference

Abstract Background Modern built-in spectrophotometer software supporting mathematical processes provided a solution for increasing selectivity for multicomponent mixtures. Objective Simultaneous spectrophotometric determination of the three naturally occurring antioxidants—rutin(RUT), hesperidin(HES), and ascorbic acid(ASC)—in bulk forms and combined pharmaceutical formulation. Method This was achieved by factorized zero order method (FZM), factorized derivative method (FD1M), and factorized derivative ratio method (FDRM), coupled with spectrum subtraction(SS). Results Mathematical filtration techniques allowed each component to be obtained separately in either its zero, first, or derivative ratio form, allowing the resolution of spectra typical to the pure components present in Vitamin C Forte® tablets. The proposed methods were applied over a concentration range of 2–50, 2–30, and 10–100 µg/mL for RUT, HES, and ASC, respectively. Conclusions Recent methods for the analysis of binary mixtures, FZM and FD1M, were successfully applied for the analysis of ternary mixtures and compared to the novel FDRM. All were revealed to be specific and sensitive with successful application on pharmaceutical formulations. Validation parameters were evaluated in accordance with the International Conference on Harmonization guidelines. Statistical results were satisfactory, revealing no significant difference regarding accuracy and precision. Highlights Factorized methods enabled the resolution of spectra identical to those of pure drugs present in mixtures. Overlapped spectra of ternary mixtures could be resolved by spectrum subtraction coupled FDRM (SS-FDRM) or by successive application of FZM and FD1M.

Determination of naturally occurring hydroxynaphthoquinone polymers by size-exclusion chromatography

2002 ◽  
Vol 55 (7-8) ◽  
pp. 423-430 ◽  
Author(s):  
V. P. Papageorgiou ◽  
A. N. Assimopoulou ◽  
G. Kyriacou
Keyword(s):  
Size Exclusion Chromatography ◽  
Size Exclusion ◽  
Naturally Occurring ◽  
Exclusion Chromatography

Determination of the geometrical configuration of naturally occurring mono-cis-lutein epoxides

1988 ◽  
Vol 27 (2) ◽  
pp. 547-549 ◽  
Author(s):  
Jo´zsef Deli ◽  
Pe´ter Molna´r ◽  
Gyula To´th ◽  
Jo´zsef Szabolcs ◽  
Lajos Radics
Keyword(s):  
Geometrical Configuration ◽  
Naturally Occurring

Determination of naturally occurring radioactive materials (NORM) in formation water during oil exploration

2009 ◽  
Vol 283 (1) ◽  
pp. 3-7 ◽  
Author(s):  
F. Moatar ◽  
S. R. Shadizadeh ◽  
A. R. Karbassi ◽  
E. Ardalani ◽  
R. Akbari Derakhshi ◽  
...  
Keyword(s):  
Oil Exploration ◽  
Formation Water ◽  
Radioactive Materials ◽  
Naturally Occurring ◽  
Naturally Occurring Radioactive Materials

ChemInform Abstract: Total Synthesis and Determination of the Absolute Configuration of FD-838, a Naturally Occurring Azaspirobicyclic Product.

ChemInform ◽  
2009 ◽  
Vol 40 (47) ◽  
Author(s):  
Yujiro Hayashi ◽  
Kuppusamy Sankar ◽  
Hayato Ishikawa ◽  
Yuriko Nozawa ◽  
Kazutoshi Mizoue ◽  
...  
Keyword(s):  
Total Synthesis ◽  
Absolute Configuration ◽  
Naturally Occurring ◽  
The Absolute

NEW COLOR REACTIONS OF SEDOHEPTULOSAN AND ITS DETERMINATION IN MIXTURES OF RIBOSE AND FRUCTOSE

1954 ◽  
Vol 32 (1) ◽  
pp. 14-18 ◽  
Author(s):  
L. Ujejski ◽  
E. R. Waygood
Keyword(s):  
Sulphuric Acid ◽  
Colorimetric Determination ◽  
Pure Solution ◽  
Naturally Occurring ◽  
Cysteine Hydrochloride ◽  
Color Reactions

The reagents carbazole – sulphuric acid, cysteine hydrochloride – sulphuric acid, have been applied successfully to the quantitative colorimetric determination of sedoheptulosan in pure solution or in the presence of ribose and/or fructose. Fructose can be determined quantitatively in the presence of sedoheptulosan and/or ribose by using a combination of the two reagents. Results indicate that while sedoheptulose reacts differently to sedoheptulosan with the orcinol reagent, the reactions with carbazole and cysteine are not altered by hydration and these may form a basis for the determination of the naturally occurring seven carbon sugar sedoheptulose.

Prevalence of Naturally Occurring Resistance Associated Substitutions in NS3/4A Protease Inhibitors in Iranian HCV/HIV Infected Patients

2021 ◽  
Vol 19 ◽  
Author(s):  
Kazem Baesi ◽  
Ali Akbar Velayati ◽  
Masoumeh Farrokh Ashtiani ◽  
Kamal Fakhredini ◽  
Mohammad Banifazl ◽  
...  
Keyword(s):  
Protease Inhibitors ◽  
Standard Treatment ◽  
Large Population ◽  
Host Immune Responses ◽  
Naturally Occurring ◽  
Immunodeficiency Virus ◽  
Direct Acting ◽  
Therapy Success ◽  
Cure Rates

Background: Hepatitis C virus (HCV) acts in host as a complicated mixture of related variants with the potency to genetically escape host immune responses. Direct acting antivirals (DAAs) have been approved for HCV treatment with shorter duration, better cure rates and lower side effects. However, naturally occurring resistance associated substitutions(RASs) make some obstacles to this antiviral therapy success. Objective: In this study, we aimed at determination of the naturally occurring NS3/4A RASs in HCV/human immunodeficiency virus (HIV)infected patients. Methods: A total of 120 DAA-naïve HCV-HIV co-infected patients were included. HCV NS3/4Agenome region was amplified with PCR and mutation analysis was performed by Sanger sequencing technique. The amino acid sequence diversity of the region wasanalyzed using geno2pheno HCV. Results: Phylogenetic analysis showed that 73 cases were infected by 3a and 47 subjects by subtype1a. The overall RASs among studied subjects wereobserved in 6 (5%) individuals from 120 studied cases who were infected with HCV 1a. V36M/L,Q80L,S122G/L,R155T/G,A156S,D168Y/N and S174A/N/T mutations were detected in this study. Conclusion: Although the prevalence of RASs was totally low in this study, the presence of several cases of double and triple mutants among this population suggests prior evaluation of protease inhibitors related mutations before initiation of standard treatment and also investigation on a large population could be of high value.

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