Some Aliphatic Methyl Esters from Aralia elata Seemann (Araliaceae)

1975 ◽  
Vol 30 (11-12) ◽  
pp. 825-825
Author(s):  
S. Watanabe ◽  
Y. Hayashi ◽  
Y. Murayama
Keyword(s):  
Mass Spectrometer ◽  
Methyl Esters ◽  
Methyl Pentadecanoate ◽  
Aralia Elata ◽  
Methyl Octadecanoate

Abstract The dried bark of Aralia elata Seemann was extracted with n-hexane. Methyl pentadecanoate, methyl hexadecanoate, methyl octadecanoate, methyl eicosanoate, methyl docosanoate, methyl tetracosanoate, methyl hexacosanoate, and 1-hexacosene were identified from the extract by means of GC-Mass spectrometer.

scholarly journals Altitude Variation in the Composition of Essential Oils, Fatty Acid Methyl Esters, and Antimicrobial Activities of Two Subspecies of Primula vulgaris Grown in Turkey

2016 ◽  
Vol 11 (10) ◽  
pp. 1934578X1601101 ◽  
Author(s):  
Nurettin Yaylι ◽  
Gonca Tosun ◽  
Büşra Yaylι ◽  
Zeynep Gündoğanc ◽  
Kamil Coşkunçelebic ◽  
...  
Keyword(s):  
Fatty Acid ◽  
Essential Oils ◽  
Mycobacterium Smegmatis ◽  
Fatty Acid Methyl Esters ◽  
Methyl Esters ◽  
Bacterial Species ◽  
Antimicrobial Activities ◽  
Primula Vulgaris ◽  
Acid Methyl ◽  
Methyl Octadecanoate

In this study, the changes caused by variation of altitude to the essential oils (EOs), fatty acid methyl esters (FAMEs), and antimicrobial activities of Primula vulgaris Huds. subsp. vulgaris ( Pvv) and P. vulgaris Huds. subsp. sibthorpii (Hoffmanns) W.W. Sm. & Forrest ( Pvs)) grown in Turkey were investigated. Major fluctuations in the composition of Pvv and Pvs oils included methyl-4-methoxy salicylate (4.5–35.3%; Pvv and 3.2–37.2%; Pvs), ( Z,Z,Z)-7,10,13-hexadecatrienal (5.1–21.8%; Pvv and 4.4–15.2%; Pvs) and flavone (5.5–14.9%; Pvv and 1.6–18.0%; Pvs). Fatty acid profile (C6:0–C26:0) changes were noted in Pvv and Pvs. Methyl hexadecanoate (2.4–9.3%) and methyl octadecanoate (1.0–4.7%) were present in all the FAME samples of the plants. The antimicrobial activity of the EOs of Pvv and Pvs were tested against nine bacterial species, which showed activity against Mycobacterium smegmatis with minimum inhibitory concentrations (MIC) varying from 8.5 to 59.2 μg/mL in all samples, respectively, depending on the altitude at which the oils were obtained.

Identification of fatty acids from butterfat using a combined gas chromatograph-mass spectrometer

1967 ◽  
Vol 34 (2) ◽  
pp. 115-121 ◽  
Author(s):  
Ragnar Ryhage
Keyword(s):  
Fatty Acids ◽  
Mass Spectrometer ◽  
Methyl Esters ◽  
Acid Methyl Ester ◽  
Straight Chain ◽  
Molecular Weights ◽  
Acid Methyl ◽  
Branched Chain ◽  
Chain Lengths

SummaryThe identification and approximate quantitative determination of methyl esters of fatty acids from commercial butterfat was obtained with a combined gaschromatograph-mass spectrometer instrument. Fifty-two components, straight chain saturated and unsaturated, as well as branched chain compounds, were identified. Seven monomethyl saturated fatty acid methyl ester isomers were identified for both C15 and C17, i.e. with chain lengths of 14 and 16 carbon atoms, respectively. Multibranched fatty acids with molecular weights of 326 and 368 were found. The results were obtained in one day.

Calcium ion imaging in plant cells

1993 ◽  
Vol 51 ◽  
pp. 132-133
Author(s):  
Peter K. Hepler ◽  
Dale A. Callaham
Keyword(s):  
Plant Cell Wall ◽  
Cytoplasmic Membrane ◽  
Fluorescent Dyes ◽  
Free Acid ◽  
Methyl Esters ◽  
Free Calcium ◽  
Local Concentration ◽  
Ion Imaging ◽  
Membrane Compartments ◽  
Free Acid Form

Calcium ions (Ca) participate in many signal transduction processes, and for that reason it is important to determine where these ions are located within the living cell, and when and to what extent they change their local concentration. Of the different Ca-specific indicators, the fluorescent dyes, developed by Grynkiewicz et al. (1), have proved most efficacious, however, their use on plants has met with several problems (2). First, the dyes as acetoxy-methyl esters are often cleaved by extracellular esterases in the plant cell wall, and thus they do not enter the cell. Second, if the dye crosses the plasma membrane it may continue into non-cytoplasmic membrane compartments. Third, even if cleaved by esterases in the cytoplasm, or introduced as the free acid into the cytoplasmic compartment, the dyes often become quickly sequestered into vacuoles and organelles, or extruded from the cell. Finally, the free acid form of the dye readily complexes with proteins reducing its ability to detect free calcium. All these problems lead to an erroneous measurement of calcium (2).

A TIME-OF-FLIGHT MASS SPECTROMETER FOR SIMS AND FIELD IONISED NEUTRAL ANALYSIS USING A PULSED LMIS

1987 ◽  
Vol 48 (C6) ◽  
pp. C6-577-C6-582 ◽  
Author(s):  
A. R. Waugh ◽  
D. R. Kingham ◽  
C. H. Richardson ◽  
M. Goff
Keyword(s):  
Mass Spectrometer ◽  
Time Of Flight ◽  
Flight Mass Spectrometer

Activity of Plasmin and Streptokinase-Activator on Substituted Arginine and Lysine Esters

1966 ◽  
Vol 16 (01/02) ◽  
pp. 018-031 ◽  
Author(s):  
S Sherry ◽  
Norma Alkjaersig ◽  
A. P Fletcher
Keyword(s):  
Molecular Structure ◽  
Methyl Ester ◽  
Comparative Studies ◽  
Esterase Activity ◽  
Methyl Esters ◽  
Hydrolytic Activity ◽  
The Other ◽  
Other Hand

SummaryComparative studies have been made of the esterase activity of plasmin and the streptokinase-activator of plasminogen on a variety of substituted arginine and lysine esters. Human plasmin preparations derived by different methods of activation (spontaneous in glycerol, trypsin, streptokinase (SK) and urokinase) are similar in their esterase activity; this suggests that the molecular structure required for such esterase activity is similar for all of these human plasmins. Bovine plasmin, on the other hand, differs from human plasmin in its activity on several of the substrates studied (e.g., the methyl esters of benzoyl arginine and tosyl, acetyl and carbobenzoxy lysine), a finding which supports the view that molecular differences exist between the two animal plasmins. The streptokinase-activator hydrolyzes both arginine and lysine esters but the ratios of hydrolytic activity are distinct from those of plasmin and of other activators of plasminogen. The use of benzoyl arginine methyl ester as a substrate for the measurement of the esterase activity of the streptokinase-activator is described.

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