scholarly journals Quantitative Technique for Measuring Volatile Components of Baked Sweetpotatoes

HortScience ◽  
1993 ◽  
Vol 28 (11) ◽  
pp. 1110-1113 ◽  
Author(s):  
Jyh-Bin Sun ◽  
Ray F. Severson ◽  
Stanley J. Kays
Keyword(s):  
Gas Chromatography ◽  
Capillary Gas Chromatography ◽  
Ipomoea Batatas ◽  
Methylene Chloride ◽  
Volatile Components ◽  
Collection System ◽  
Breeding Lines ◽  
Volatile Collection ◽  
Minor Compounds ◽  
Chromatographic Mass

We describe a relatively simple collection procedure for quantifying volatiles in baked sweetpotato [Ipomoea batatas (L.) Lam.]. Volatiles formed during baking `Jewel' and `Centennial' sweetpotatoes at 204C were purged from a baking vessel with He or a HeO2 mixture, collected in cold methylene chloride, and reduced in volume using a Kuderna-Danish concentrator. Volatile components were quantified by capillary gas chromatography and characterized using gas chromatographic-mass spectrometer analysis. Quantitatively, the major components were identified as 2-furaldehyde; 2-furanmethanol; benzaldehyde; 5-methyl-2-furfural; phenylacetaldehyde; 3-hydroxy-2-methyl-4 H -pyran-4-one; 2,3-dihydro-3,5-dihydroxy-6-methyl-4 H- pyran-4-one; and 5-hydroxy-methyl-2-furancarboxaldehyde. Some quantitatively minor compounds were also identified. The volatile collection system is reproducible for quantitative comparisons among breeding lines.

Flavor Composition of Maryland Tobacco

1984 ◽  
Vol 12 (5) ◽  
Author(s):  
Joseph N. Schumacher
Keyword(s):  
Gas Chromatography ◽  
Liquid Chromatography ◽  
Capillary Gas Chromatography ◽  
Methylene Chloride ◽  
Minor Component ◽  
The Other ◽  
Glass Capillary ◽  
Preparative Liquid Chromatography ◽  
Gas Chromatography Mass Spectroscopy ◽  
Trace Components

AbstractThis study was undertaken to determine if Maryland tobacco contains any unique flavour components and to compare its composition to that of flue-cured and Burley tobaccos. Methylene chloride extracts prepared from these tobaccos were fractionated by liquid-liquid partitions and by preparative liquid chromatography. The resulting fractions were analysed by glass capillary gas chromatography and by glass capillary gas chromatography / mass spectroscopy. The essential oils of these tobaccos were also examined. Only one minor component was found in Maryland tobacco that was not found in the other tobaccos. If the minor and trace components were further studied, other differences might be found. Based on this study, however, the uniqueness of Maryland tobacco is primarily, if not entirely, due to quantitative differences. Also, Maryland tobacco is no more similar to Burley (middle-stalk or low-stalk leaves) than it is to flue-cured tobacco.

Determination and Confirmation of cis-9-Tricosene in Technical Materials by Capillary Gas Chromatography and Gas Chromatography/Mass Spectrometry

1992 ◽  
Vol 75 (5) ◽  
pp. 878-882
Author(s):  
Jinren Ko ◽  
Jack Nguyen ◽  
Jim Burleson
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Correlation Coefficient ◽  
Calibration Curve ◽  
Capillary Gas Chromatography ◽  
Methylene Chloride ◽  
Internal Standard ◽  
Gas Chromatography Mass Spectrometry ◽  
Technical Material ◽  
Standard Calibration

Abstract A capillary gas chromatographic (GC) method was developed for the quantitation of cis-9-tricosene in technical material. This method is capable of resolving cis-9-tricosene from the trans-9-tricosene isomer and other impurities in technical 9-tricosene. Samples are dissolved in methylene chloride and analyzed by splitless GC using docosane as an internal standard. The integrity and purity of the peak of interest were confirmed by GC/mass spectrometry. The overall recovery of this method was 101.3 ± 0.82%. The correlation coefficient of the standard calibration curve was 0.9999. The system and method precision for cis-9-tricosene were 0.18 and 0.20%, respectively. The reproducibility of the method by different analysts was within 0.5%.

scholarly journals Collection and Analysis of Butyltin Compounds in Air at Nanogram-Per-Cubic-Meter Levels

1996 ◽  
Vol 79 (1) ◽  
pp. 170-174 ◽  
Author(s):  
Kamal Swami ◽  
Rajinder S Narang
Keyword(s):  
Gas Chromatography ◽  
Detection Limit ◽  
Sodium Borohydride ◽  
Analytical Method ◽  
Capillary Gas Chromatography ◽  
Methylene Chloride ◽  
Photometric Detection ◽  
Flame Photometric Detection ◽  
Butyltin Compounds

Abstract An analytical method for determining butyltin chlo rides in air at low nanogram-per-cubic-meter levels was developed. Butyltin chlorides investigated were mono-n-butyltin trichloride (MBTC),di-n-butyltin dichloride (DBTC), and tri-n-butyltin chlo ride (TBTC). These tin chlorides were trapped on cartridges packed with Porapak-N, eluted with methylene chloride containing 0.3% HCI, hy dridized with sodium borohydride, and analyzed by capillary gas chromatography with flame photometric detection. On the basis of a 20 m3 sample, a detection limit of 0.05 ng/m3 can be achieved.

Gas Chromatographic-Mass Spectrometric Analysis, Identification, and Detection of Adulteration of Natural and Concentrated Lemon Oils

1982 ◽  
Vol 65 (1) ◽  
pp. 166-171
Author(s):  
Manfred J Prager ◽  
Michael A Miskiewicz
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Capillary Gas Chromatography ◽  
Mass Spectrometric ◽  
Mass Spectrometric Analysis ◽  
Geranyl Acetate ◽  
Spectrometric Analysis ◽  
Glass Capillary ◽  
Chromatographic Mass

Abstract Lemon oils were characterized by quantitative glass capillary gas chromatography. Components present to the extent of more than 0.05% were measured and identified by mass spectrometry. In expressed lemon oils, monoterpenes and geranial were the only components present at concentrations of 1.0% or more. In concentrated lemon oils, β-caryophyllene, linalool, neral, β-terpineol, neryl acetate, and geranyl acetate were present in some samples in amounts of 1% or more. Adulteration was detected by component concentrations outside characteristic ranges for oils judged to be authentic.

Gas Chromatographic-Mass Spectrometric Detection of Adulteration of Natural Lime Oils

1985 ◽  
Vol 68 (6) ◽  
pp. 1154-1159
Author(s):  
Rocco T Alessandro ◽  
James M Adams ◽  
Michael A Miskiewicz
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Confidence Intervals ◽  
Capillary Gas Chromatography ◽  
Mass Spectrometric ◽  
Mass Spectrometric Detection ◽  
Glass Capillary ◽  
Chromatographic Mass

Abstract Distilled and expressed lime oils were characterized by glass capillary gas chromatography. Components present at concentrations greater than 0.1% were identified by mass spectrometry. Expressed oils contained less than 1% monoterpene alcohols, whereas distilled oils contained more than 10%. Expressed oils contained sabinene and 4 times as much beta-pinene as distilled oils. Adulteration was detected by finding component area percents and/or their ratios to be outside the 95% confidence intervals established for pure oils.

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