scholarly journals Alkylresorcinols in rye (Secale cereale L.) grains. VI. Colorimetric micromethod for the determination of alkylresorcinols with the use of diazonium salt, Fast Blue B

2014 ◽  
Vol 50 (4) ◽  
pp. 645-651 ◽  
Author(s):  
Franciszek Tłuścik ◽  
Arkadiusz Kazubek ◽  
Wanda Mejbaum-Katzenellenbogen
Keyword(s):  
Secale Cereale ◽  
Diazonium Salt ◽  
Precise Method ◽  
Fast Blue ◽  
Alkyl Derivatives ◽  
Secale Cereale L ◽  
Derivatives Of

A simple and precise method for alkylresorcinols determination was elaborated. The method a based on coupling of alkylresorcinals with diazotized Fast Blue B, in acidified propaaiol. The method is highly specific for 5-n-alkyl derivatives of resorcinols. In case of rye and wheat 98.1% and 96.2% respectively of total extinction value were due to 5-n-alkylresorcinols.

scholarly journals Alkylresorcinols of rye (Secale cereale L.) caryopses IV. Three-step preparation of 5-n-alkylresorcinols

2015 ◽  
Vol 47 (4) ◽  
pp. 379-389 ◽  
Author(s):  
W. Mejbaum-Katzenellenbogen ◽  
F. Tłuścik ◽  
A. Kozubek
Keyword(s):  
Thin Layer ◽  
Secale Cereale ◽  
Room Temperature ◽  
Uv Spectrum ◽  
Wheat Grains ◽  
Alkyl Derivatives ◽  
Secale Cereale L ◽  
Spectrum Characteristic ◽  
Layer Chromatography ◽  
Derivatives Of

Whole rye or wheat grains were extracted with acetone at room temperature. The extracts were pooled and acetone was evaporated. The remaining acetone oil was washed out with n-pentane until a colourless filtrate was obtained. The residue was dried, then dissolved in chloroform-acetone (95:5) mixture and separated by column chromatography on silica gel. The fractions containing 5-n-alkylresorcinols were pooled, condensed and crystallised from n-hexane. The preparation obtained was homogeneous in thin-layer chromatography and gave the UV spectrum characteristic for 5-n-alkyl derivatives of resorcinol.

scholarly journals Alkylresorcinols in rye (Secale cereale L.) grains. I. Micromethod for determination of alkyl derivatives of resorcinol in rye grain

2015 ◽  
Vol 44 (4) ◽  
pp. 479-489 ◽  
Author(s):  
W. Mejbaum-Katzenellenbogen ◽  
F. Tłuścik ◽  
A. Kozubek ◽  
A. Sikorski
Keyword(s):  
Preparative Thin Layer Chromatography ◽  
Uv Spectrum ◽  
Selective Determination ◽  
Alkyl Derivatives ◽  
Secale Cereale L ◽  
Spectrum Characteristic ◽  
Acetone Extracts ◽  
Layer Chromatography ◽  
Derivatives Of

A pure preparation of alkylresorcinol from rye grains was obtained by preparative thin-layer chromatography, which gave a UV spectrum characteristic for 5-n-alkylresorcinols and orcinol. This preparation served as standard in the elaboration of a micro method (for alkylresorcinols determination in acetone extract from rye grain. It was found that this method is suitable for selective determination of 5-n-alkylrezorcinols in acetone extracts from rye grains.

scholarly journals Synthesis, characterization, and structural determination of copper(II) complexes with alkyl derivatives of hydroxybenzophenones

2017 ◽  
Vol 70 (5) ◽  
pp. 898-913 ◽  
Author(s):  
Cristiane Batista Gonçalves ◽  
Maria Vanda Marinho ◽  
Danielle Ferreira Dias ◽  
Marcelo Henrique Dos Santos ◽  
Felipe Terra Martins ◽  
...  
Keyword(s):  
Structural Determination ◽  
Alkyl Derivatives ◽  
Derivatives Of ◽  
Determination Of Copper

scholarly journals Benzoxazinoids Biosynthesis in Rye (Secale cereale L.) Is Affected by Low Temperature

Agronomy ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1260
Author(s):  
Beata Bakera ◽  
Magdalena Święcicka ◽  
Anna Stochmal ◽  
Mariusz Kowalczyk ◽  
Leszek Bolibok ◽  
...  
Keyword(s):  
Gene Expression ◽  
Low Temperature ◽  
Secale Cereale ◽  
Expression Level ◽  
Protective Properties ◽  
Specialized Metabolites ◽  
Secale Cereale L ◽  
Gene Expression Levels ◽  
Time Point

Benzoxazinoids (BXs) are specialized metabolites with protective properties that are synthesized predominantly by Poaceae species, including rye (Secale cereale). Among factors known to influence BXs production, prolonged low temperature has not been studied previously. In this study, the influence of cultivation at 4 °C, which is essential for vernalization, on the concentration of BXs (HBOA, DIBOA, GDIBOA, DIMBOA, GDIMBOA, and MBOA) and the expression level of genes involved in the BX biosynthesis pathway (ScBx1–ScBx5 and ScIgl) in three rye inbred lines was investigated. After cultivation for seven weeks at 4 °C, the expression level of all analyzed genes and BX concentrations had decreased compared with those at the initiation of treatment (21 days after germination) in control and cold-treated plants. At this time point, the decrease in BX concentrations and gene expression was lower in cold-treated plants than in untreated plants. In contrast, at 77 days after germination, the gene expression levels and BX concentrations in untreated plants had generally increased. Investigation of the vernalization impact on rye BXs accumulation, as well as on Bx gene expression, may aid with determination of the most suitable winter lines and cultivars of rye for cultivation and breeding purposes.

Effet antioxydant et antihyperglycémiant du seigle (Secale cereale L.) et du sorgho (Sorghum bicolor L.) chez le rat Wistar rendu diabétique

2018 ◽  
Vol 16 (S1) ◽  
pp. S273-S283
Author(s):  
Z. Mami-Soualem ◽  
N. Brixi ◽  
C. Beghdad ◽  
M. Belarbi
Keyword(s):  
Sorghum Bicolor ◽  
Secale Cereale ◽  
Stress Oxydant ◽  
Habitudes Alimentaires ◽  
Diabète Sucré ◽  
Secale Cereale L ◽  
Vitamine C ◽  
Fibres Alimentaires ◽  
Peroxydation Lipidique ◽  
Sorghum Bicolor L

Le changement des habitudes alimentaires au cours de ces dernières années a abouti à l’apparition des maladies dites de civilisation, parmi elles le diabète sucré. Des approches diétothérapeutiques privilégient la consommation des produits céréaliers sous la forme la plus complète possible. Ce travail a pour but de tester l’efficacité des régimes expérimentaux préparés à base des grains complets des deux céréales, le sorgho (Sorghum bicolor L.) et le seigle (Secale cereale L.), sur la correction de l’hyperglycémie et des marqueurs du stress oxydant associés au diabète chez le rat mâle Wistar. Les résultats montrent que les rats diabétiques, soumis au régime seigle pendant quatre semaines, présentent une diminution significative de la glycémie qui atteint les 53,95 % à la fin de l’expérimentation, ce qui fait que leur taux en glycémie se rapproche de celui des normoglycémiques. Le sorgho blanc présente, d’une part, une diminution significative de la peroxydation lipidique intracellulaire et, d’autre part, une augmentation de l’activité de la glutathion peroxydase, la glutathion réductase ainsi que la vitamine C. Ces approches méthodologiques peuvent, en améliorant la connaissance de l’importance des céréales (fibres alimentaires solubles et des polyphénols) dans l’évolution du diabète, aboutir à des recommandations et à une éducation nutritionnelle du diabétique.

Nauwkeurige methode voor de aanwasbepaling van het grondvlak met behulp van de Pressler-boor

1968 ◽  
Vol 12 ◽  
Author(s):  
R. Goossens
Keyword(s):  
Basal Area ◽  
Precise Determination ◽  
Maximum Diameter ◽  
Precise Method ◽  
Maximum Radius ◽  
The Core ◽  
Two Parameters

A precise method for the determination of the increment of the  basal area using the PressIer bore. Refering to  previous research showing that the basal area of the corsica pine could be  characterized by an ellips, we present in this paper a precise method for the  determination of the increment of the basal area. In this method we determine  the direction of the maximum diameter, we measure this diameter and we take a  core in one of the points of tangency of the caliper with the measured tree.  The determination of the diameter perpendicular to the maximum diameter  finishes the work wich is to be done in the forest. From the classical  measurements effectuated on the core and from the measured diameters we can  then determine the form (V) and the excentricity (e). Substituting these two  parameters in the formula 2 or 2', we can also calculate the error of a  radius measured on the core with respect to the representative radius, This  error with them allow us to correct the measured value of the minimum or the  maximum radius and we will be able to do a precise determination of the  increment.

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