Head space gas-chromatographic determination of residual ethylene oxide in cosmetic products

1991 ◽  
Vol 341 (12) ◽  
pp. 720-722 ◽  
Author(s):  
H. Leskovšek ◽  
A. Grm ◽  
J. Marsel
Keyword(s):  
Ethylene Oxide ◽  
Chromatographic Determination ◽  
Cosmetic Products ◽  
Head Space

Gas chromatographic determination of residual ethylene oxide by head space analysis

1973 ◽  
Vol 45 (14) ◽  
pp. 2327-2330 ◽  
Author(s):  
S. J. Romano ◽  
J. A. Renner ◽  
P. M. Leitner
Keyword(s):  
Ethylene Oxide ◽  
Chromatographic Determination ◽  
Space Analysis ◽  
Head Space ◽  
Head Space Analysis

Headspace gas chromatographic determination of ethylene oxide in air

1986 ◽  
Vol 21 (12) ◽  
pp. 701-704 ◽  
Author(s):  
R. Binetti ◽  
S. Di Marzio ◽  
P. Di Prospero ◽  
L. Gramiccioni ◽  
G. Viviano ◽  
...  
Keyword(s):  
Ethylene Oxide ◽  
Chromatographic Determination ◽  
Headspace Gas

Gas Chromatographic Determination of Residual Hexane in Modified Hop Extract

1972 ◽  
Vol 55 (6) ◽  
pp. 1226-1227
Author(s):  
Mark A Litchman ◽  
Lewis A Turano ◽  
Ronald P Upton
Keyword(s):  
Liquid Chromatography ◽  
Quantitative Determination ◽  
Chromatographic Determination ◽  
Methanol Solution ◽  
Chromatographic Column ◽  
Gas Liquid Chromatography ◽  
Porapak Q ◽  
Residual Hexane ◽  
Head Space

Abstract A method is described for the quantitative determination of hexane in modified hop extract by head-space gas-liquid chromatography. A sample of extract is weighed into a serum vial and water-methanol solution is added. The vial is sealed tightly and heated 1 hr in a 70°C bath. A sample of the head-space gas over the solution is injected onto a Porapak Q gas chromatographic column for determination. Recovery of 2–29 ppm hexane added to potassium isohumulone was 95.5–114.8%. The method may be applicable to other hop extracts.

Head-space gas-chromatographic determination of 3-hydroxybutyrate in plasma after enzymic reactions, and the relationship among the three ketone bodies.

1985 ◽  
Vol 31 (4) ◽  
pp. 596-598 ◽  
Author(s):  
M Kimura ◽  
K Kobayashi ◽  
A Matsuoka ◽  
K Hayashi ◽  
Y Kimura
Keyword(s):  
Ketone Bodies ◽  
Normal Subjects ◽  
Chromatographic Determination ◽  
Diabetic Patients ◽  
Head Space ◽  
Analytical Recovery ◽  
Acetoacetate Decarboxylase ◽  
Reproducible Method ◽  
The Relationship

Abstract In this sensitive, reproducible method for determination of D-3-hydroxybutyrate (3-OHB) in plasma, it is converted to acetone by use of 3-hydroxybutyrate dehydrogenase (EC 1.1.1.30)/lactate dehydrogenase (EC 1.1.1.27) coupled with acetoacetate decarboxylase (EC 4.1.1.4). The resulting acetone is detected by head-space gas chromatography. The lowest concentration of 3-OHB detectable in plasma was 2 mumol/L. The calibration curve showed a linear relationship for 3-OHB concentration from 0 to 5 mmol/L (r = 0.999). Analytical recovery of 3-OHB (50 mumol/L) was 97.9 (SD 3.8)%. The method was developed for determination of the three ketone bodies in plasma. The ratio of acetone to acetoacetate was not significantly different (p greater than 0.2) between normals (n = 31) and diabetics (n = 86). In normal subjects, the ratio of 3-OHB to acetoacetate was 1.20 (SD 0.44). In diabetic patients, the ratio correlated with the logarithm of the total ketone body concentration (r = 0.828).

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