Glass Capillary Columns

Verzele, M.; Verstappe, M.; Sandra, Patrick; Luchene, E. Van; Vuye, A

doi:10.1093/chromsci/10.11.668

Cited by 34 publications

(4 citation statements)

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“…Both make analysis of low concentrations difficult, and the latter is known to prejudice quantitative results. 374 McCallum has developed a simple device which allows the analysis of large sample volumes (over 10 µ ) without stream splitting and makes the advantages of using capillary columns, e.g., high resolution and Its attendant increased sensitivity of detection, available for all types of quantitative analysis for cannabinoids. 375 Plasma chromatography has been advocated as an analytical method for the determination of cannabinoids in the microgram to picogram range.…”

Section: E Endocrine and Hormonal Effectsmentioning

confidence: 99%

Recent advances in the chemistry and biochemistry of cannabis

Mechoulam¹,

McCallum²,

Burstein³

1976

Chem. Rev.

188

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Section: E Endocrine and Hormonal Effectsmentioning

confidence: 99%

Recent advances in the chemistry and biochemistry of cannabis

Mechoulam¹,

McCallum²,

Burstein³

1976

Chem. Rev.

188

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“…In fact, it is doubtful whether any toluene and benzene, which have been reported as pyrolysis products of polystyrene (1, 11), were formed at all, because the small ion peaks at m/e 78 and 92 seem to behave as fragment ions rather than as parent ions when the electron energy is varied. This would indicate a virtual absence of secondary pyrolysis reactions in this case, most probably as a result of the combination of a pyrolysis temperature below 600 °C (11), a low-pressure environment and a microgram amount of sample (5).…”

mentioning

confidence: 94%

Curie point pyrolysis in direct combination with low voltage electron impact ionization mass spectrometry. New method for the analysis of nonvolatile organic materials

Meuzelaar¹,

Posthumus²,

Kistemaker³

et al. 1973

Anal. Chem.

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DISCUSSIONTable I presents the composition of the six solutions used in this study. These solutions were all 6N in HC1. They varied in complexity from 4 to 14 components. The salt/amino acid ratio ranged from 1.55 to 5290. Both low and high voltage electrophoresis caused the amino acids to be separated into three groups., two migrated toward the cathode and one migrated toward the anode-i.e., neutral, basic, and acidic amino acids, respectively. The basic amino acids were displaced as much as 10 cm toward the cathode while the neutrals migrated 1 to 3 cm toward the cathode. The metal cations were displaced toward the cathode. In the case of the high voltage runs, the basic amino acids were displaced further toward the cathode than the metal cations present. It is noted that under high voltage conditions, solutions 5 and 6 give slightly different results from the others with regard to amino acid migration. In these instances, the neutral amino acids were split into two bands. One remained very close to the spot zone, while the other was displaced about 2 to 3 cm from the spot zone. Since these solutions differed from the others by containing /3-alanine, methionine, aspartic acid, isoleucine, and valine, one or all of these materials are responsible for the band in the vicinity of the spot zone. No attempt was made to ascertain which of these amino acids were involved.Comparison of Tables II and III indicates clearly that high voltage electrophoretic desalting is more effective than low voltage applications. Even in the case of the simplest solution. No. 3, 9% of the iron cation remained with the basic amino acid band after the low voltage run was completed.The variations noted between high voltage runs 4 and 5 and between runs 6 and 7 are probably due to slight changes in experimental conditions during the course of the runs involved. The data shown in Table IV made this a plausible explanation. In this case, the runs were closely monitored specifically with respect to temperature. Not* only were the results very consistant, but they also demonstrated the effect of varying the run time.These data clearly show that electrophoretic desalting is practical for the preparation of amino acid concentrates prior to derivatization. The potential of this technique as a step in a fully automated procedure for the analysis of amino acids in geological sample is under further investigation.

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“…A comprehensive review in Hungarian cites 155 references to the literature on glass capillary columns, their preparation and applications (795). On-column injection is recommended by Verzele (885) with wider glass open tubular columns since (i) there is practically no loss in efficiency, (ii) quantitative results are more reliable than when a splitter is used, (iii) samples can be relatively large, (iv) the glass surface is less reactive toward thermally labile materials. Equipment and methods for direct injection into capillary columns were also described by Grob and Grob (328) and applied for the analysis of tobacco smoke.…”

mentioning

confidence: 99%

Gas chromatography

Juvet¹,

Cram²

1974

Anal. Chem.

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This review surveys developments in the field of gas chromatography since publication of the last review in this series (178) and covers the years 1972-73. Gas chromatography continues to be one of the most active areas in analytical chemistry. In the 1973 Directory of Membership of the ACS Division of Analytical Chemistry (356), those listing their research specialty as "gas chromatography" were second in numbers only to those listing the drugs compiled by the editorial staff (423) and articles on applications of GC in alcohol analysis (417), hallucinogenic drugs ( 818), the analysis of narcotic analgesics and amphetamines (622), barbiturates (446), and phenothiazine drugs (158).

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Glass Capillary Columns

Cited by 34 publications

References 0 publications

Recent advances in the chemistry and biochemistry of cannabis

Recent advances in the chemistry and biochemistry of cannabis

Curie point pyrolysis in direct combination with low voltage electron impact ionization mass spectrometry. New method for the analysis of nonvolatile organic materials

Gas chromatography

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