Gas chromatogram of volatiles

Figure 3. Capillary Gas Chromatogram of Volatiles from Soil, Chromatographic data adsorption 4 h on Tenax TA desorption 8 min at 200 C column fused silica 0.3 mm, 20 m, SE33 temperature programming 40 to 230 C at 5 C/min carrier gas helium (50 cm/s),...

Figure G1.7.4 A model mouth and human mouth comparison shows a gas chromatogram of volatile compounds released from rehydrated French beans in the model mouth (n = 6 upper chromatogram) and in the mouth of assessors (n = 12, lower chromatogram).

Figure 4. Gas chromatograms of volatiles isolated from NLIB top chromatogram, pH 4.2 bottom chromatogram, pH 9 30 m x 0.25 mm fused silica DB-1 column, temperature programmed 50°C for 0.1 min., then 4 C/min. to 220 C, held at 220 C for 20 min.

Figure 5. Gas chromatograms of volatiles of meats with A no additive, B sodium ascorbate (550 ppm) and sodium nitrite (150 ppm), and C sodium tripolyphosphate (3000 ppm), sodium ascorbate (550 ppm) and butylated hydroxyanisole (30 ppm).

Gas chromatograms of volatile pyrolysis products formed from plasma-polymerized HMCTSN and HMCTSO are shown in Figs. 1 and 2, respectively. They were identified by mass spectrometry and with the aid of certain standard compounds. For the sake of brevity it is not possible to discuss the mass spectra here. The structures of pyrolysis products corresponding to the respective chromatographic peaks are presented in Table I for both polymers. It should be noted that the peaks marked by X (Figs. 1 and 2) correspond to unseparated mixture of light hydrocarbons. As can be seen from Table I, the pyrolysis products in the case of both polymers consist of low molecular cyclic organosilicon compounds. 

Figure 5. Gas chromatograms of volatiles of leaf sheaths of rice varieties susceptible ( TNI1) and resistant to l. lugens (Biotype 1). "Reproduced with permission from Ref. 33. Copyright 1985, Plenum Publishing Corporation."...

Figure 4. Gas chromatogram of volatile fatty acids from a semi-corona discharge through methane and water...

Figure 2. Replicate gas chromatograms of volatiles from combustion of paper sampled with a polydimethylsiloxane/divinylbenzene (PDMS/DVD) SPME fibre.

Figure 12. Gas chromatogram of volatiles from 0.2 g of clams exposed to South Louisiana crude oil...

Fig. 8. Gas Chromatogram of volatile oil from rhizomes of C. aeruginosa, 1 pL of volatile oil solutions was injected (split mode 1 50) at 270°C onto a HP-5 column using nitrogen as carrier gas at a flow rate of 2 mL.min-i. The oven temperature was programmed for 60-240° C (4°C.min-i) and 240-270°C (10°C.min-i) then held for 2 min. The FID detector was maintained at 275°C.

Figure 1. Gas chromatograms of volatile compounds isolated from (A) IMP + alliin, (B) IMP + deoxyalliin, and (C) IMP model systems.

In Figures 8.4 A to E are shown gas chromatograms of volatiles obtained when polystyrenes from two different manufacturers were heated at 200 C for 15 minutes under helium. All the samples liberated the same range of aromatic hydrocarbons, these differing only in their... 

Figure 8.3 Gas chromatogram of volatiles liberated from PE heated at different temperatures for 15 minutes in air. Chromatographed on 60 m x 1.5 mm id dibutyl phthalate coated copper column at 30 °C and 100 ml/min helium flow, with flame...

Figure 7. Gas chromatograms of volatiles formed by L-cysteine-dihydroxyacetone model system in various medium.

Figure 1. Gas chromatograms of volatiles in beer obtained using flash evaporator...

Fig. 16.30 Gas chromatograms of kerosene recovered from sand, sandy loam and peat after volatilization at 5 and 27 °C for 30 and 7 days, respectively R denotes remaining kerosene (% of initial amount). Reprinted from Jarsjo J, Destouni G, Yaron B (1994) Retention and volatilization of kerosene laboratory experiments on glacial and postglacial soils. J Contam Hydrol 17 167-185. Copyright 1994 with permission of Elsevier...

Gas chromatogram of cholesterol and other lipids extracted from bones and derivatized with trimethylsilyl ((CH Si—) groups to increase volatility for chromatography. Bone contains 2 to 50 ng cholesterol/gram of dry bone. 

Figure 2. Gas chromatogram of the neutral/basic volatile fraction isolated from a pale lager beer. Numbers characterize an odor-active position.

The material adsorbed on the molecular sieves in Run 2 was desorbed by ammonia. A gas chromatogram of this material is shown in Figure 5 the n-paraffin peak area represents 95% of the total area of the trace. The n-paraffins present are predominantly in the to 23 range> with maxima at C g through C21. Upon comparing Figures 4 and 5, it is apparent that the Cn-paraffins didn t significantly volatilize and adsorb on the molecular sieves. 

Figure 16. Comparison of gas chromatograms of 2-methylthiazolidine and volatile sample from Glc and Cys.

Figure 2. Gas Chromatograms of the Volatiles from E. pacifica Prepared by Steam Distillation under the Reduced Pressure. Conditions Column, PEG 20M 0.25mm i.d. X 50m FS-WCOT,...

Figure 2. Capillary gas chromatogram of blended pineapple pulp volatiles obtained by dynamic headspace sampling. Temperature programmed from SOX (4 min isothermal) to 180X at 2X/min on a 60m X 0.32 mm i.d. DB-WAX column. The peak numbers correspond to the numbers in Table II.

Figure 6. Gas chromatogram of sulfur volatiles from Cheddar cheese containing encapsulated methioninase and ripened at 21°C for 21 days, then 3 months at 10°C (Carbopak BHT-100 column).

Figure 1. Gas chromatogram of the volatile cyclic products of pyrolysis at 400°C of plasma-polymerized hexameth-ylcyclotrisilazane...

Figure 10. Gas chromatogram of headspace volatiles from direct-processed UHT milk stored 12 wk.

Figure 3.7-2. Gas chromatogram of headspace volatiles released from a culture of Stachybotrys char-tarum on damp paper. Volatiles analyzed by diffusive sampling on Tenax TA followed by thermal desorption.

Since higher molecular weight organic compounds were found after the cyclone than further down the process stream the condenser samples and a filter sample from after the cyclone were studied further. Because all the gas chromatograms of condenser samples indicated the presence of components with a wide range of volatility, a portion of the dichloromethane sample collected at 0 C was fractionated by the Sephadex LH-20 column. The mass distribution of this condenser sample and its subfractions are given in Table IV. 

Figure 1. Typical capillary gas chromatogram of headspace volatiles obtained from the urine of a cow showing behavioural estrus. The numbers are retention times in seconds. Conditions are given in the text. 

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