scholarly journals Gas Chromatographic Method for the Simultaneous Determination of S-p-Toluylmercapturic Acid and S-Phenylmercapturic Acid in Human Urine

1998 ◽  
Vol 22 (3) ◽  
pp. 211-214 ◽  
Author(s):  
J. Angerer ◽  
M. Schildbach ◽  
A. Krämer
Keyword(s):  
Simultaneous Determination ◽  
Human Urine ◽  
Chromatographic Method ◽  
Gas Chromatographic Method

scholarly journals Rapid Gas Chromatographic Method for Simultaneous Determination of Cholesterol and α-Tocopherol in Eggs

1998 ◽  
Vol 81 (6) ◽  
pp. 1177-1184 ◽  
Author(s):  
Nickos Botsoglou ◽  
Dimitrios Fletouris ◽  
Ioannis Psomas ◽  
Antonios Mantis
Keyword(s):  
Simultaneous Determination ◽  
Chromatographic Method ◽  
Labor Cost ◽  
Precision Data ◽  
Total Analysis Time ◽  
Accuracy And Precision ◽  
Relative Standard ◽  
Total Analysis ◽  
Gas Chromatographic Method

Abstract A new method was developed for simultaneous determination of cholesterol and α-tocopherol in eggs. It involves rapid and simple sample preparation accomplished in one tube and chromatographic separation that does not require derivatization of analytes. Total analysis time per sample is 40 min. Labor, cost, and use of hazardous chemicals are minimized. To ensure selectivity, accuracy, and precision, critical analytical parameters were investigated. Overall recoveries were 98.8 and 99.2% for cholesterol and α-tocopherol, respectively. Linearity was acceptable for both analytes (r = 0.9964 for cholesterol and 0.9996 for α-tocopherol) in the fortification range examined. Precision data based on within-day and between-days variation gave overall relative standard deviations of 2.0% for cholesterol and 7.0% for α-tocopherol.The method was applied successfully for quantitation of cholesterol and α-tocopherol in eggs.

scholarly journals Development of Gas-Chromatographic Method for Simultaneous Determination of Cannabinoids and Terpenes in Hemp

Molecules ◽  
2020 ◽  
Vol 25 (24) ◽  
pp. 5872
Author(s):  
Jure Zekič ◽  
Mitja Križman
Keyword(s):  
Sample Preparation ◽  
Simultaneous Determination ◽  
Chromatographic Separation ◽  
Chromatographic Method ◽  
Linear Range ◽  
Extraction Solvent ◽  
Parallel Testing ◽  
Medium Polarity ◽  
Gas Chromatographic Method

An original gas chromatographic method has been developed for simultaneous determination of major terpenes and cannabinoids in plant samples and their extracts. The main issues to be addressed were the large differences in polarity and volatility between both groups of analytes, but also the need for an exhaustive decarboxylation of cannabinoid acidic forms. Sample preparation was minimised, also by avoiding any analyte derivatisation. Acetone was found to be the most appropriate extraction solvent. Successful chromatographic separation was achieved by using a medium polarity column. Limits of detection ranged from 120 to 260 ng/mL for terpenes and from 660 to 860 ng/mL for cannabinoids. Parallel testing proved the results for cannabinoids are comparable to those obtained from established HPLC methods. Despite very large differences in concentrations between both analyte groups, a linear range between 1 and 100 µg/mL for terpenes and between 10 and 1500 µg/mL for cannabinoids was determined.

scholarly journals Simultaneous Determination of Patulin and Penicillic Acid in Grains by Gas Chromatographic Method

1974 ◽  
Vol 38 (6) ◽  
pp. 1259-1260 ◽  
Author(s):  
Toshimasa SUZUKI ◽  
Yoshinori FUJIMOTO ◽  
Yôji HOSHINO ◽  
Akio TANAKA
Keyword(s):  
Simultaneous Determination ◽  
Chromatographic Method ◽  
Penicillic Acid ◽  
Gas Chromatographic Method
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