Laser desorption mass spectrometry with LAMMA

Heinen, H. J.; Meier, Samuel M.; Vogt, H.; Wechsung, R.

doi:10.1007/bf00479643

Cited by 28 publications

(21 citation statements)

References 6 publications

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“…One class of compounds for which LD shows great potential is the carbohydrates. Spectra with abundant (continued on page 293 A) (17). An example of this type of spectrum is shown in Figure 5b.…”

Section: Spectra Of Organic Compoundsmentioning

confidence: 96%

Laser Microprobe Mass Spectrometry 2. Applications to Structural Analysis

Hercules¹,

Day1²,

Balasanmugam³

et al. 1982

Anal. Chem.

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Section: Spectra Of Organic Compoundsmentioning

confidence: 96%

Laser Microprobe Mass Spectrometry 2. Applications to Structural Analysis

Hercules¹,

Day1²,

Balasanmugam³

et al. 1982

Anal. Chem.

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“…Thirty droplets were analysed by means of a laser microprobe mass analyser (Lamma 500; Leybold-Heraeus, Cologne, Germany). The LAMMA instrument combines a light microscope for observation and exact localization of the sample as well as for focusing the beam of a pulsed laser into the specimen, and an MS (Heinen et al, 1981;Heinrich, 1990). A minute volume of the sample is ionized by the high intensity laser.…”

Section: Lamma Techniquementioning

confidence: 99%

Glandular Hairs of Sigesbeckia jorullensis Kunth (Asteraceae): Morphology, Histochemistry and Composition of Essential Oil

Heinrich¹

2002

Annals of Botany

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Long-stalked glandular hairs of outer and inner involucral bracts of Sigesbeckia jorullensis, which are important for epizoic fruit propagation, were investigated using light and scanning electron microscopy. The essential oil secreted by the hairs was analysed by chromatographic methods including gas chromatography/mass spectrometry and with a laser microprobe mass analyser. The glandular hairs consisted of a large multicellular stalk and a multicellular secreting head. The apical layer of glandular head cells was characterized by leucoplasts and calcium oxalate crystals. Below the apical cells there were up to six layers of cells containing many chloroplasts around the nucleus and surrounded by vacuoles filled with flavonoids and tannins. The essential oil originating in the head cells was secreted into the subcuticular space and may be liberated by rupture of the cuticle. It was mainly composed of sesqui- and diterpenes, with the sesquiterpene hydrocarbon germacrene-D as the main component. Monoterpenes, n-alkanes and their derivatives as well as flavonoid aglycones were also detected. The stickiness of the essential oil is probably associated with the high content of oxygenated sesqui- and diterpenes. In addition to long-stalked trichomes, small biseriate trichomes occurred, secreting small quantities of essential oil into a subcuticular space.

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“…Laser energy is adjusted either to provide complete vaporization of a micrometer size sample of the fiber or else to give the lowest energy which provides a mass spectrum. Adsorbed impurities onto the fiber surface can be detected in this laser desorption (LD) operation mode (17). In the LD mode a rather small number of ions are formed belonging to a limited number of ion species that are in most cases directly related to the molecular structure of the material analyzed, often with a high yield of the parent molecular ions (M+), protonated (M + 1)+, or cationized species ( + Na)+ or ( + K)+ (17)(18)(19).…”

Section: Methodsmentioning

confidence: 99%

“…Adsorbed impurities onto the fiber surface can be detected in this laser desorption (LD) operation mode (17). In the LD mode a rather small number of ions are formed belonging to a limited number of ion species that are in most cases directly related to the molecular structure of the material analyzed, often with a high yield of the parent molecular ions (M+), protonated (M + 1)+, or cationized species ( + Na)+ or ( + K)+ (17)(18)(19). When laser desorption is applied to asbestos, the fibers remain intact and the characteristic mass spectrum of the material vanishes to an insignificant intensity.…”

Section: Methodsmentioning

confidence: 99%

Laser microprobe mass analysis of asbestos fiber surfaces for organic compounds

Waele¹,

Vansant²,

Espen³

et al. 1983

Anal. Chem.

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Laser microprobe mass analysis was applied for the analysis of organic Impurities at the surface of asbestos fibers. Benzo[a]pyrene was adsorbed from the gas phase and from a benzene solution, benzidine from aqueous solution and N,Ndlmethylanlllne from benzene. By use of laser desorption conditions these compounds, and In the case of N,N-ü\methylanlline Its oxidation products, such as Methyl Violet, could easily be detected.

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Laser desorption mass spectrometry with LAMMA

Cited by 28 publications

References 6 publications

Laser Microprobe Mass Spectrometry 2. Applications to Structural Analysis

Laser Microprobe Mass Spectrometry 2. Applications to Structural Analysis

Glandular Hairs of Sigesbeckia jorullensis Kunth (Asteraceae): Morphology, Histochemistry and Composition of Essential Oil

Laser microprobe mass analysis of asbestos fiber surfaces for organic compounds

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