Volatile Constituents of Muskmelon (Cucumis melo cv. Mission)

The volatiles of muskmelon (Cucumis melo L. reticulatis cv. Mission) were sampled by dichloromethane extraction and dynamic headspace methods and analyzed by gas chromatography (GC) and GC–mass spectroscopy (MS). A total of 34 constituents were identified, with esters contributing 8%–92% of the total volatiles. Butyl propionate, ethyl 3-methylpentanoate, hexadecanoic acid, methyl (methylthio)acetate, propyl butyrate, phenylpropyl alcohol, and vanillin, were recovered only by solvent extraction, while hexanal was only detected using dynamic headspace sampling. Methyl butyrate 35.2%, ethyl acetate 17.1%, butyl acetate 11.6%, ethyl propionate 8.3%, and 3-methylbutyl acetate 6.3% were the major constituents by solvent extraction sampling method. Butyl acetate 35.5%, 3-methylbutyl acetate 20.9%, ethyl acetate 7.3%, 2-butyl acetate 5.6%, and hexyl acetate 3.8% were the major constituents recovered by headspace sampling. Fruit tissue was also separated into five layers (exocarp, outer mesocarp, middle mesocarp, inner mesocarp, and seed cavity) and the volatile constituents differed significantly in content and composition by tissue.

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Volatile constituents ofexacum affine balf. f. Flowers obtained by dynamic headspace sampling and as the essential oil

Flavour and Fragrance Journal ◽

10.1002/ffj.2730090204 ◽

1994 ◽

Vol 9 (2) ◽

pp. 55-58 ◽

Cited By ~ 3

Author(s):

Gerhard Buchbauer ◽

Leopold Jirovetz ◽

Michael Wasicky ◽

Alexej Nikiforov

Keyword(s):

Essential Oil ◽

Headspace Sampling ◽

Dynamic Headspace ◽

Volatile Constituents ◽

Dynamic Headspace Sampling

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Development of a Flavor Profile of `Gala' Apples Using OSME Sensory Technique

HortScience ◽

10.21273/hortsci.30.4.889e ◽

1995 ◽

Vol 30 (4) ◽

pp. 889E-889

Author(s):

A. Plotto ◽

M.R. McDaniel ◽

J.P. Mattheis

Keyword(s):

Volatile Compounds ◽

Butyl Acetate ◽

Dynamic Headspace ◽

Intensity Scale ◽

Gas Chromatograph ◽

Apple Variety ◽

Dynamic Headspace Sampling ◽

Kováts Indices ◽

Methyl Butyrate ◽

Flavor Profile

`Gala' is an early season apple variety that has a distinctive aroma and flavor. Studies were conducted to identify volatile compounds that contribute to `Gala' aroma. `Gala' apples were harvested at optimum maturity in a commercial orchard. Volatile compounds were trapped on activated charcoal using dynamic headspace sampling and eluted with carbon disulfide. Odor profiles of the samples were determined using OSME, a method developed at Oregon State Univ. that combines gas chromatography and olfactometry with a time-intensity scale. Three trained panelists described odor characteristics of compounds eluted through a sniff port of a gas chromatograph. Compounds were identified by matching Kovats indices with those of standards and also by mass spectrometry. Butyl acetate, 2-methyl butyl acetate, and pentyl acetate were characteristic of `Gala' apple. Methyl-2-methyl butyrate, ethyl-2-methyl butyrate, pentyl acetate, and butyl-2-methyl butyrate carried apple-like descriptors.

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The Flavor Property of Soft Cheese Fermented by Two Stains of Streptococcus thermophilus and Made of Reconstituted Milk

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.396-398.1536 ◽

2011 ◽

Vol 396-398 ◽

pp. 1536-1540

Author(s):

Yan Hua Li ◽

Lan Wei Zhang ◽

Wei Jun Wang ◽

Li Li Zhang ◽

Xue Han ◽

...

Keyword(s):

Ethyl Acetate ◽

Butyl Acetate ◽

Streptococcus Thermophilus ◽

Acetate Methyl ◽

Soft Cheese ◽

Significant Difference ◽

Cheese Volatiles ◽

Methyl Butyrate ◽

Reconstituted Milk ◽

The Impact

The effect of reconstituted milk inoculation with Streptococcus thermophilus TM11 and Streptococcus thermophilus SP 1.1 on soft cheese volatiles was investigated. The impact flavors of 2,3-butanedione, 2,3-pentanedione, ethyl acetate, methyl butyrate, ethyl butyrate, butyl acetate and butyric acid were only detected in the fermented cheeses. Levels of diketones were higher in the cheeses fermented by mixed cultures than single culture, while levels of esters except ethyl acetate and butyl acetate showed an opposite tendency. There was significant difference in the levels of 2-hexenal and 2-nonenal among the cheeses. Other compounds originated from lipid oxidation, Strecker degradation, biosynthesis and forages were not significantly influenced by milk inoculation with Streptococcus thermophilus.

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Developing a Method for the Collection and Analysis of Burnt Remains for the Detection and Identification of Ignitable Liquid Residues Using Body Bags, Dynamic Headspace Sampling, and TD-GC×GC-TOFMS

Separations ◽

10.3390/separations5030046 ◽

2018 ◽

Vol 5 (3) ◽

pp. 46 ◽

Cited By ~ 2

Author(s):

Katie Nizio ◽

Shari Forbes

Keyword(s):

Forensic Analysis ◽

Headspace Sampling ◽

Dynamic Headspace ◽

Flight Mass Spectrometry ◽

Detection And Identification ◽

Dynamic Headspace Sampling ◽

Fire Debris ◽

Primary Focus ◽

Ignitable Liquid ◽

And Storage

In cases of suspected arson, a body may be intentionally burnt to cause loss of life, dispose of remains, or conceal identification. A primary focus of a fire investigation, particularly involving human remains, is to establish the cause of the fire; this often includes the forensic analysis of fire debris for the detection of ignitable liquid residues (ILRs). Commercial containers for the collection of fire debris evidence include metal cans, glass jars, and polymer/nylon bags of limited size. This presents a complication in cases where the fire debris consists of an intact, or partially intact, human cadaver. This study proposed the use of a body bag as an alternative sampling container. A method was developed and tested for the collection and analysis of ILRs from burnt porcine remains contained within a body bag using dynamic headspace sampling (using an Easy-VOC™ hand-held manually operated grab-sampler and stainless steel sorbent tubes containing Tenax TA) followed by thermal desorption comprehensive two-dimensional gas chromatography–time-of-flight mass spectrometry (TD-GC×GC-TOFMS). The results demonstrated that a body bag containing remains burnt with gasoline tested positive for the presence of gasoline, while blank body bag controls and a body bag containing remains burnt without gasoline tested negative. The proposed method permits the collection of headspace samples from burnt remains before the remains are removed from the crime scene, limiting the potential for contamination and the loss of volatiles during transit and storage.

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Intraspecific and interspecific attraction of threeTomicusbeetle species during the shoot-feeding phase

Bulletin of Entomological Research ◽

10.1017/s0007485315000048 ◽

2015 ◽

Vol 105 (2) ◽

pp. 225-233 ◽

Cited By ~ 4

Author(s):

J. Wang ◽

Z. Zhang ◽

X. Kong ◽

H. Wang ◽

S. Zhang

Keyword(s):

Sampling Method ◽

Beetle Species ◽

Dynamic Headspace ◽

Headspace Volatiles ◽

Interspecific Attraction ◽

Host Trees ◽

Pinus Yunnanensis ◽

Dynamic Headspace Sampling ◽

Ecological Relationship ◽

Tomicus Minor

AbstractThe shoot beetlesTomicus minor, Tomicus yunnanensis, andTomicus brevipilosushave been decimatingPinus yunnanensistrees for more than 30 years in Southwestern China. To understand the chemical ecological relationship between pines andTomicus, and among the three beetle species, we compared the attraction of these beetles to damaged shoots, extracts from damaged shoots, and volatiles from damaged shoots collected by the dynamic headspace sampling method. Experiments were performed using a modified open-arena olfactometer. The maleT. minorand both sexes ofT. brevipilosuswere more strongly attracted to damaged shoots than to undamaged shoots and they showed attraction to shoots damaged by the same species. FemaleT. minorand both sexes ofT. yunnanensiswere attracted to shoots damaged by femaleT. brevipilosus. The three beetle species were attracted to shoot extracts and dynamic headspace volatiles from shoots damaged by the same species and sex. FemaleT. minorand maleT. yunnanensiswere also attracted to dynamic headspace volatiles from shoots damaged by both sexes ofT. brevipilosus. The results suggested that specific semiochemicals that are induced or produced byT. brevipilosusalso attractT. minorandT. yunnanensis. The semiochemicals in damaged shoots affect the attraction of the three beetle species and play an important chemical communication role in weakening the host trees during the beetles’ shoot-feeding phase.

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