Levels of Brominated Vegetable Oils in Soft Drinks by X-Ray Fluorescence Spectrometry and Gas-Liquid Chromatography

1970 ◽  
Vol 53 (3) ◽  
pp. 571-575
Author(s):  
H B S Conacher ◽  
J C Meranger ◽  
J Leroux
Keyword(s):  
Vegetable Oils ◽  
Screening Method ◽  
Soft Drinks ◽  
Fluorescence Spectrometry ◽  
Rapid Screening ◽  
Gas Liquid Chromatography ◽  
X Ray ◽  
Wide Range ◽  
Rapid Screening Method

Abstract A rapid screening method using X-ray fluorescence spectrometry has been developed for the detection and semiquantitative estimation of brominated vegetable oils in soft drinks. This method and a quantitative GLC technique have been applied to the determination of the brominated oil content in a wide range of soft drinks. Of 46 drinks examined, 23 contained brominated vegetable oils at levels between 7 and 85 mg/10 fluid oz of drink.

Gas-Liquid Chromatographic Screening Method for Determination of Methyl Mercury in Tuna and Swordfish

1983 ◽  
Vol 66 (1) ◽  
pp. 128-129
Author(s):  
Theron James
Keyword(s):  
Methyl Mercury ◽  
Methylene Chloride ◽  
Screening Method ◽  
Fish Tissue ◽  
Rapid Screening ◽  
Gas Liquid Chromatography ◽  
Absorption Method ◽  
Rapid Screening Method ◽  
Liquid Chromatographic

Abstract A rapid screening method has been developed for determining methyl mercury in tuna and swordfish. Fish tissue is blended with acidic KBr solution to release methyl mercury, which is then extracted into methylene chloride. After cleanup by partitioning with cysteine, the methyl mercury is extracted into toluene and determined by gas-liquid chromatography. The proposed method compares favorably with the official AOAC atomic absorption method.

A Rapid Screening Method for the Determination of Di-(n-octyl) Tin Stabilizers in Alcoholic Beverages, Using a Heated Graphite Atomizer

1975 ◽  
Vol 58 (6) ◽  
pp. 1143-1146 ◽  
Author(s):  
Jean-Charles Méranger
Keyword(s):  
Screening Method ◽  
Alcoholic Beverages ◽  
Fluorescence Spectrometry ◽  
Rapid Screening ◽  
Resonance Spectroscopy ◽  
Plastic Container ◽  
X Ray ◽  
Tin Content ◽  
Plastic Containers

Abstract A method is described for the rapid screening of di-(n-octyl) tin stabilizers in alcoholic beverages, using a heated graphite atomizer coupled to an atomic absorption spectrophotometer. Benzene can selectively extract di-(ra-octyl) tin stabilizers in the presence of inorganic tin. Nuclear magnetic resonance spectroscopy is used to confirm the presence of the ra-octyl grouping in a benzene extract of a plastic container and x-ray fluorescence spectrometry is used to follow the efficiency of the purification steps. The tin content of 5 types of plastic containers presently used in Canada for the storage of alcoholic beverages was obtained by x-ray fluorescence spectrometry and levels of up to 1700 μg Sn/g plastic were found. The alcoholic beverages contained therein, which included 22 samples of gin, martini, cognac, red wine, and sherry, were analyzed for di-(n-octyl) tin content. Although the method used will detect 0.04 ppm Sn, there was no evidence of leaching in any of the samples analyzed.

Collaborative Study of the Extraction of Plant Sterols from Adulterated Butter Oil Using a Digitonin-impregnated Celite Column

1970 ◽  
Vol 53 (3) ◽  
pp. 535-538
Author(s):  
Denis E Lacroix
Keyword(s):  
Liquid Chromatography ◽  
Vegetable Oil ◽  
Coefficient Of Variation ◽  
Collaborative Study ◽  
Screening Method ◽  
Rapid Screening ◽  
Gas Liquid Chromatography ◽  
Butter Oil ◽  
Average Coefficient ◽  
Rapid Screening Method

Abstract A rapid screening method for the analysis of the phytosterol, β-sitosterol, in butter oil adulterated with vegetable oil has been studied collaboratively. The sterols are removed from the adulterated butter oil by passing the sample through a digitonin-impregnated Celite 545 column, eluting the sterols with dimethyl sulfoxide, and analyzing the eluate for β-sitosterol by gas-liquid chromatography using a 3% JXR column. The average coefficient of variation for those samples containing more than 4 mg β-sitosterol/100 g adulterated butter oil is 12.6%. Therefore, β-sitosterol can be used as an index to qualitatively detect vegetable oil adulteration of butter oil.

The Determination of Blood Sugar: A Rapid Screening Method Utilizing Glucose Oxidase Paper

Diabetes ◽  
1958 ◽  
Vol 7 (6) ◽  
pp. 486-489 ◽  
Author(s):  
H. S. Lipscomb ◽  
J. Bean ◽  
H. L. Dobson ◽  
J. A. Greene
Keyword(s):  
Glucose Oxidase ◽  
Blood Sugar ◽  
Screening Method ◽  
Rapid Screening ◽  
Rapid Screening Method

Rapid Screening Method for Simultaneous Determination of Organochlorine and Organophosphate Pesticide Residues in Wheat by Gas-Liquid Chromatography

1974 ◽  
Vol 57 (4) ◽  
pp. 924-929
Author(s):  
Iser Levi ◽  
Thomas W Nowicki
Keyword(s):  
Ball Milling ◽  
Screening Method ◽  
Soxhlet Extraction ◽  
Rapid Screening ◽  
Electron Capture Detection ◽  
Gas Liquid Chromatography ◽  
Photometric Detection ◽  
Gas Chromatographic Method ◽  
Ground Wheat

Abstract A previously reported gas chromatographic method for screening of organochlorine residues in wheat has been modified to permit rapid simultaneous screening for common organochlorine and organophosphate residues in wheat. Ground wheat is extracted by ball-milling with ethyl ether-hexane (3+97). The extract is divided into 2 equal portions. One half is used without cleanup for determination of organophosphates by flame photometric detection. The other half is cleaned up on Florisil prior to determination of organoehlorines by electron capture detection. The mean average recovery of 9 organoehlorines from wheat fortified at 0.50 ppm was 80%. Wheat analyzed immediately after treatment with 15 organophosphates showed an average mean recovery of 93%. After 8 weeks' storage, 9 of 15 organophosphates were recovered in excess of 60%, with an average mean recovery of 90% at the 1.00 ppm fortification level. The average mean recovery for 9 organophophates was 7% lower for extraction by ball-milling with ethyl etherhexane than for Soxhlet extraction with methanol- chloroform (10+90).

A Rapid Screening Method for the Elimination of Cross-Contamination in the Determination of Protein-Bound Iodine

1959 ◽  
Vol 5 (6) ◽  
pp. 615-616 ◽  
Author(s):  
John A Ackerman ◽  
John T Myers
Keyword(s):  
Screening Method ◽  
Rapid Screening ◽  
Cross Contamination ◽  
Special Equipment ◽  
Screening Process ◽  
Rapid Screening Method ◽  
Time Required

Abstract The described method should be of value as a rapid Screening process to eliminate serum containing a nonphysiologic high amount of iodine, thereby preventing contamination of other samples in the ashing oven. The advantage over other published methods is that it does not require special reagents or special equipment. The sensitivity is in the range of 300-400 µg. and total time required about 15-20 minutes.

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