scholarly journals Conductometric Titration for Determination of Trazodone Hydrochloride and Solubility Products of its Ion-Associated Complex Species

2018 ◽  
Vol 2 (2) ◽  
pp. 113-122
Author(s):  
Fathy Salama ◽  
Khalid Attia ◽  
Ragab Said ◽  
Ahmed El-Olemy ◽  
Ahmed Abdel-raoof
Keyword(s):  
Conductometric Titration ◽  
Complex Species ◽  
Solubility Products ◽  
Trazodone Hydrochloride

Determination of Phenylephrine-HCl Using Conductometric Titration Method

2016 ◽  
Vol 12 (4) ◽  
pp. 330-334 ◽  
Author(s):  
Shlear H. Hasan ◽  
Nabeel S. Othman ◽  
Kafia M. Surchi
Keyword(s):  
Conductometric Titration ◽  
Titration Method

Spectrophotometric, spectrofluorimetric and LC determination of trazodone hydrochloride

2001 ◽  
Vol 26 (2) ◽  
pp. 211-217 ◽  
Author(s):  
Alaa El-Gindy ◽  
Badr El-Zeany ◽  
Tamer Awad ◽  
Marwan M. Shabana
Keyword(s):  
Trazodone Hydrochloride

Micellar‐Enhanced Spectrofluorimetric Determination of Trazodone Hydrochloride in Human Urine and Serum

2007 ◽  
Vol 40 (1) ◽  
pp. 151-162 ◽  
Author(s):  
Gong‐Jun Yang ◽  
Ping Liu ◽  
Xi‐Long Qu ◽  
Ming‐Shen ◽  
Chen‐Ying Wang ◽  
...  
Keyword(s):  
Human Urine ◽  
Spectrofluorimetric Determination ◽  
Human Urine And Serum ◽  
Urine And Serum ◽  
Trazodone Hydrochloride

scholarly journals Determination of Iron in Raw Materials, During Fabric Processing, and in Wastewaters of the Textile Industry

1999 ◽  
Vol 82 (3) ◽  
pp. 683-688 ◽  
Author(s):  
Zorana Grabaric ◽  
Ljerka Bokic ◽  
Branka Stefanovic
Keyword(s):  
Stability Constants ◽  
Textile Industry ◽  
Raw Materials ◽  
Variation Method ◽  
Ratio Method ◽  
Industrial Water ◽  
Complex Species ◽  
Woolen Fabric ◽  
Good Agreement

Abstract The Schiff base 2-(2-pyridylmethyieneamino)phenol (PMAP) was investigated as a spectrophotometric reagent for determination of iron in caustic soda, cotton yarn and fabric, woolen fabric, and industrial water. The solution properties of Fe(III)-PMAP complexes were determined. At pH 4.4 and 5.6, Fe(III) forms stable complexes with PMAP, with molar absorption coefficients (ε) of 3.00 × 103 and 7.44 × 103/M.cm, respectively. Composition and cumulative stability constants were determined by the mole ratio method (MRM) and the mole fraction variation method (MFVM). At the lower pH (4.4), the predominant complex species in the solution obtained with both methods are ML2, with fairly good agreement of stability constants: log βML2 = 7.00 ± 0.04 with MRM and 7.31 ± 0.01 with MFVM. At the higher pH (5.6), the composition and stability constants of predominant complex species in the solution obtained with the 2 methods were not in good agreement, perhaps because of the coexistence of several species, such as Fe-PMAP, Fe-hydroxo, and Fe-acetate complexes. PMAP is a sensitive reagent for determination of Fe(III). The detection limit of 0.4 μg/mL is lower than those of other frequently used spectrophotometric reagents for Fe. The reagent is ecologically more acceptable, because extraction with organic solvents is avoided. All measurements were made at pH 5.6 because sensitivity was higher at this pH. The high Fe values obtained for industrial water (31.8 μg/mL) indicate that some modifications in the process have to be done. Concentration of Fe in wastewater was much lower (15.9 μg/mL). The results for cotton and woolen fabric indicate that accumulation of Fe in wool is much higher than in cotton (84.4 μg/mL and 29.3-53.1 μg/mL, respectively).

scholarly journals A “Green” Homogenate Extraction Coupled with UHPLC-MS for the Rapid Determination of Diterpenoids in Croton Crassifolius

Molecules ◽  
2019 ◽  
Vol 24 (4) ◽  
pp. 694
Author(s):  
Jin-Long Tian ◽  
Chi Shu ◽  
Ye Zhang ◽  
Hui-Jun Cui ◽  
Xu Xie ◽  
...  
Keyword(s):  
High Performance ◽  
Rapid Determination ◽  
Biological Activities ◽  
Bioactive Constituents ◽  
Complex Species ◽  
Chromatography Tandem Mass Spectrometry ◽  
Homogenate Extraction ◽  
Liquid Chromatography Tandem Mass ◽  
Clerodane Diterpenoids

Clerodane diterpenoids are the main bioactive constituents of Croton crassifolius and are proved to have multiple biological activities. However, quality control (QC) research on the constituents are rare. Thus, the major research purpose of the current study was to establish an efficient homogenate extraction (HGE) process combined with a sensitive and specific ultra-high-performance liquid chromatography-tandem mass spectrometry (UHPLC–MS) technique together for the rapid extraction and determination of clerodane diterpenoids in C. crassifolius. All calibration curves showed good linearity (r > 0.9943) within the test ranges and the intra- and inter-day precisions and repeatability were all within required limits. This modified HGE–UHPLC–MS method only took 5 min to extract nine clerodane diterpenoids in C. crassifolius and another 12 min to quantify these components. The results indicated that the quantitative analysis based on UHPLC–MS was a feasible method for QC of clerodane diterpenoids in C. crassifolius, and the findings outlined in the current study also inferred the potential of the method in the QC of clerodane diterpenoids in other complex species of plants.

The determination of the stoichiometry and stability constant of weak complexes in solution: a restatement of the "straight-line" method

1983 ◽  
Vol 61 (6) ◽  
pp. 1100-1102 ◽  
Author(s):  
Aurelio Beltrán-Porter ◽  
José A. Ramírez
Keyword(s):  
Stability Constant ◽  
Stoichiometric Ratio ◽  
Complex Species ◽  
Line Method ◽  
Straight Line ◽  
Weak Complexes ◽  
The Stability ◽  
Degree Of Condensation ◽  
Straight Line Method

Usually, to establish the degree of condensation of a complex species in solution, primarily when it is a weak complex, is more cumbersome than to determine the stoichiometric ratio itself. The present work describes a modification of the Asmus method in order to render it suitable for the determination of the actual stoichiometric coefficients and the stability constant of weak complexes whatever the degree of condensation may be.

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