scholarly journals Determination of Terpenoid Content in Pine by Organic Solvent Extraction and Fast-GC Analysis

2016 ◽  
Vol 4 ◽  
Author(s):  
Anne E. Harman-Ware ◽  
Robert Sykes ◽  
Gary F. Peter ◽  
Mark Davis
Keyword(s):  
Solvent Extraction ◽  
Organic Solvent ◽  
Gc Analysis ◽  
Organic Solvent Extraction ◽  
Fast Gc

Determination of Bilirubin in Amniotic Fluid: A Comparison of Some Current Methods

1976 ◽  
Vol 13 (1-6) ◽  
pp. 510-515 ◽  
Author(s):  
A. Simkins ◽  
H. G. J. Worth
Keyword(s):  
Solvent Extraction ◽  
Organic Solvent ◽  
Amniotic Fluid ◽  
Accurate Result ◽  
Degradation Products ◽  
Regression Equations ◽  
Organic Solvent Extraction

Three methods for the estimation of bilirubin in amniotic fluid are compared. The within-batch precision and recovery of bilirubin by each method has been studied, and the effects of the presence of haemoglobin, methaemoglobin, and methaemalbumin in varying concentrations have been investigated. Measurements on amniotic fluid from patients with rhesus isoimmunization have also been compared and regression equations calculated. The results of the three methods agree reasonably well so long as no haemoglobin degradation products are present. It is suggested that in the presence of these products a method involving organic solvent extraction of bilirubin gives the most accurate result.

Rapid Spectrophotometric Method for Determination of Benzoic and Cinnamic Acids in Balsam Tolu

1979 ◽  
Vol 62 (1) ◽  
pp. 82-84
Author(s):  
Sawsan El-Masry
Keyword(s):  
Standard Deviation ◽  
Solvent Extraction ◽  
Organic Solvent ◽  
Relative Standard Deviation ◽  
Spectrophotometric Method ◽  
Cinnamic Acids ◽  
Organic Solvent Extraction ◽  
Relative Standard ◽  
The Individual

Abstract A rapid spectrophotometric method is described for the individual assay of balsamic acids. The method has been applied to the determination of benzoic and cinnamic acids in samples of balsam tolu. Compared with the British Pharmaceutical Codex procedure, the recommended method combines the advantages of a faster analysis and the determination of individual balsamic acids without the need of organic solvent extraction. The sample is saponified and purified and the 2 balsamic acids are determined spectrophotometrically using the 2-wavelength method of analysis. The method has been successfully applied to the analysis of 4 batches of balsam tolu. The relative standard deviation is 1.85%.

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