Quality Control: Parts 6.2.3 – 6.3

Mosandl, Armin; Grosch, Werner; Lögtenbörger, Heinz‐Jürgen

doi:10.1002/9783527611454.ch6b

Cited by 2 publications

(2 citation statements)

References 183 publications

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“…P. pinea is the only species characterized by a very strong limonene content, and P. kesiya, P. taeda and P. patula are strongly dominated by ~-pinene. The enantiomer ratios for each of these three monoterpenes were determined by Original antiomer separation is much easier to achieve than hitherto the use of cyclodextrin derivatives as stationary phases in GC columns enables the full separation of all the enantiomers by means of MDGC systems or simply by GC, depending on the complexity of the matrix [14,15,21,22]. Figure 3 shows a total ion-current chromatogram obtained from enantiomer-selective MDGC of a sample from P.…”

Section: Peak Nomentioning

confidence: 99%

Differentiation of ten pine species from central portugal by monoterpene enantiomer-selective composition analysis using multidimensional gas chromatography

et al. 2001

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SummaryThe composition of the volatile terpenes emitted by different trees has been successfully used as markers in a wide variety of studies such as chemotaxonomy. In this work discrimination among ten pine species, R pinea, R pinaster, R brutia, R elliottii, R halepensis, R kesiya, R radiata, R patula, R sylvestris, and R taeda was achieved by analyzing the relative composition of their volatile emissions. The analysis was performed after simultaneous distillation extraction; 16 monoterpenes were identified. My means of principal component analysis it was shown that discrimination among species could be maximized by taking into account three monoterpenes only -~z-pinene,/~-pinene, and hmonene. In a second stage of the work the extracts were submitted to enantiomer-selective multidimensional gas chromatography (MDGC). The enantiomer ratio was determined after separation on a tailor-made 2, 3-dimethyl-6-9 methylsilyl-/~-cyclodextrin analytical column. Application of principal component analysis to the samples enabled their comparative characterization.

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Section: Peak Nomentioning

confidence: 99%

Differentiation of ten pine species from central portugal by monoterpene enantiomer-selective composition analysis using multidimensional gas chromatography

et al. 2001

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“…Determination of the stable-isotope-ratio of oxygen, nitrogen, and carbon has proved a reliable means of determining of the origin and authenticity of food and food additives such as flavoring aromas [1,2], wine [3], honey [4 6], and vinegar [7,8]. Another significant isotopic marker is sulfur [9,10], which occurs in most samples but at much lower concentrations.…”

Section: Introductionmentioning

confidence: 99%

Liquid chromatographic enrichment ofN-acetylmethionine from casein hydrolysates for stable-isotope-ratio analysis of sulfur

Lamprecht

Haberhauer²

2001

Chromatographia

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Key WardsColumn liquid chromatography Sulfur stable-isotope-ratio analysis Isotope-fractionation Casein N-Acetylmethionine SummaryA chromatographic method has been developed for enrichment of methionine-bouncl sulfur ~n casein, for stable-isotope analysis. Casein is precipitated from milk samples and cleaved by acid hydrolysis in 6 M hydrochloric acid at 95 ~ The amino acids released are converted into their N-acetyl derivatives by addition of acetic acid anhydride. After lyophihzation, N-ace@-methionine is separated from the accompanying components on octaclecylsilica by use of a gradient prepared from 0.02 M formic acid and methanol. The fractions containing N-ace@-methionine are pooled and freeze dried. Procedures for hydrolysis and clerivatization were optimized to furnish the highest yields. The influence of the abundance ratio on the chromatographic separation is shown and discussed. From 1.0 g casein 16.5 mg N-acetylmethionine were isolated.

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Quality Control: Parts 6.2.3 – 6.3

Cited by 2 publications

References 183 publications

Differentiation of ten pine species from central portugal by monoterpene enantiomer-selective composition analysis using multidimensional gas chromatography

Differentiation of ten pine species from central portugal by monoterpene enantiomer-selective composition analysis using multidimensional gas chromatography

Liquid chromatographic enrichment ofN-acetylmethionine from casein hydrolysates for stable-isotope-ratio analysis of sulfur

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