Variability of Suberin Composition of Reproduction Cork from Quercus suber Throughout Industrial Processing

Holzforschung ◽  
1999 ◽  
Vol 53 (1) ◽  
pp. 56-62 ◽  
Author(s):  
E. Conde ◽  
M. C. García-Vallejo ◽  
E. Cadahía
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Sodium Methoxide ◽  
Quercus Suber ◽  
The Other ◽  
Gas Chromatography Mass Spectrometry ◽  
Industrial Processing ◽  
Alkanoic Acids ◽  
Monomeric Composition ◽  
Store Room

Summary The chemical composition of suberin was studied in cork planks from three different trees of Spanish Quercus suber at four different stages of the industrial processing of first transformation: stripping (a), first rest (b), boiling followed by open air rest (c1) and boiling followed by store-room rest (c2). The monomeric composition was determined by gas chromatography/mass spectrometry in the product of depolymerization of the free of extractives cork with sodium methoxide-methanol. The average concentrations of the main monomers were: 1-alkanols (C20–C26) 4.17 %; alkanoic acids (C20–C26) 5.99%; α, ω-alkanedioic acids (C16–C24) 6.20%; ω-hydroxy-alkanoic acids (C20–C26) 29.41%; erythro and threo-9,10-dihydroxyoctadecanedioic acids 6.76%, erythro- and threo-9,10,18-trihydroxyoctadecanoic acids 9.50%, 9,10-epoxy-18-hydroxyoctadecanoic acid 2.72% and 9,10-epoxy-octadecanedioic acid 2.93% and ferulic acid 5.05%. Significant differences were observed between samples taken at the stripping and after boiling with store room rest, and both groups of samples differed from those picked after the other two processing stages. Ten components were selected as providing the greatest discrimination among stages: 9-octadecenedioic, 18-hydroxy-9-octadecenoic, eicosanedioic and 9,10-epoxy-18-hydroxy-octadecanoic acids, tetracosanol, and five unidentified components.

Catalytic Pyrolysis of Waste Achyranthes Root Over Al-MCM-41

2021 ◽  
Vol 21 (7) ◽  
pp. 4081-4084
Author(s):  
Seul-Bee Lee ◽  
Young-Min Kim ◽  
Ji-Hui Park ◽  
Young-Kwon Park
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Aromatic Hydrocarbons ◽  
Catalytic Pyrolysis ◽  
The Other ◽  
Gas Chromatography Mass Spectrometry ◽  
Acidic Properties ◽  
Achyranthes Root ◽  
Formation Efficiency ◽  
Mcm 41

This study examined the thermal and catalytic pyrolysis of waste Achyranthes Root (AR) using pyrolyzer-gas chromatography/mass spectrometry (Py-GC/MS). The non-catalytic pyrolysis of waste AR produced various kinds of oxygenates, such as acetic acid, hydroxy propanone, furfural, phenol, cresol, guaiacols, syringols, and so on. By applying nanoporous Al-MCM-41 with acidic properties and mesopores to the pyrolysis of waste AR, the levels of furan and aromatic hydrocarbons production increased with a concomitant decrease in the other oxygenates. The formation efficiency of furans was improved further by increasing the amount of Al-MCM-41 applied to the catalytic pyrolysis of waste AR.

scholarly journals Essential Oil Constituents of Eclipta Prostrata (L.) L. and Vernonia amygdalina Delile

2009 ◽  
Vol 4 (3) ◽  
pp. 1934578X0900400 ◽  
Author(s):  
Akinola O. Ogunbinu ◽  
Guido Flamini ◽  
Pier L. Cioni ◽  
Isiaka A. Ogunwande ◽  
Sunday O. Okeniyi
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Chemical Composition ◽  
Stem Bark ◽  
The Other ◽  
Gas Chromatography Mass Spectrometry ◽  
Vernonia Amygdalina ◽  
Straight Chain ◽  
Aerial Parts ◽  
Eclipta Prostrata

The chemical composition of the essential oils from the leaves and stem bark of Eclipta prostrata (L.) L. and the aerial parts of Vernonia amygdalina Delile (Asteraceae) have been analyzed by capillary gas chromatography (GC) and gas chromatography/mass spectrometry (GC/MS). The investigation led to the identification of 33 and 30 compounds in the oils of the leaves and stem of E. prostrate, respectively, and 40 compounds in the oil of V. amygdalina. While the oil of the leaves of E. prostrata was highly dominated by sesquiterpenoids (89.3%), the stem bark was comprised of sesquiteprenoids (47.7%), straight chain hydrocarbons (25.6%) and monoterpenoids (11.1%). The main constituents of both oils were β-caryophyllene (47.7% and 15.9%) and α-humulene (31.8 and 12.9%) in the leaves and stem, respectively. In addition, ( E)-β-farnesene (10.0%) was also identified in significant amount in the stem bark. On the other hand, the major component of V. amygdalina oil was α-muurolol (45.7%).

THE IN VIVO METABOLISM OF CORTISOL AND CORTICOSTERONE BY THE MACAQUE MONKEY (Macaca fascicularis)

1975 ◽  
Vol 78 (1) ◽  
pp. 91-109 ◽  
Author(s):  
K. D. R. Setchell ◽  
C. H. L. Shackleton
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Adult Female ◽  
Human Urine ◽  
Macaca Fascicularis ◽  
Macaque Monkey ◽  
The Other ◽  
Gas Chromatography Mass Spectrometry ◽  
In Vivo Metabolism

ABSTRACT [4-14C] Cortisol was administered intramuscularly to one adult female macaque monkey, MF3 (Macaca fascicularis). To adult female macaque monkey, MF4, [4-14C]corticosterone was administered intramuscularly. Urine samples were collected and the metabolites excreted identified using gas chromatography, radio-gas chromatography and gas chromatography-mass spectrometry. The principal metabolites of cortisol were identified as glucuronide conjugates of 11-oxygenated-17-oxosteroids. The excretion of tetrahydrocortisol and tetrahydrocortisone relative to the other corticosteroid metabolites was low compared with that of man. Two compounds, 3β-cortol and 3β-cortolone not normally present in human urine were identified in the urine from this species. The principal metabolites of corticosterone were glucuronide conjugates of hexahydroCompound A and hexahydrocorticosterone. Two unidentified radioactive compounds were also present.

scholarly journals Terpenes/Terpenoids in Cannabis: Are They Important?

2020 ◽  
Vol 3 (1) ◽  
pp. 25-60
Author(s):  
Lumír Ondřej Hanuš ◽  
Yotam Hod
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Medical Treatment ◽  
Essential Oils ◽  
Cannabis Sativa ◽  
The Other ◽  
Gas Chromatography Mass Spectrometry ◽  
Plant Materials ◽  
Chromatography Mass Spectrometry ◽  
Mass Spectrometry Detector

Cannabis sativa plant has not only cannabinoids as crucial compounds but also the other compounds that play important role as synergistic and/or entourage compound. Cannabis/hemp plant materials and essential oils were analyzed with the help of gas chromatography/mass spectrometry detector for the content of terpenes and terpenoids. The main terpenes/terpenoids and their abundance in the samples were evaluated. Results of this study will be helpful in the next evaluation of these compound in mixture with cannabinoids and their importance in medical treatment.

Study on the Characteristic Components of Distinguishing Dalbergia cochinchinensis from the Other Three Similar Dalbergia Species

2021 ◽  
Vol 71 (4) ◽  
pp. 336-341
Author(s):  
Fang-Da Zhang ◽  
Ji-Lei Wang ◽  
Li-jin Guo ◽  
An-Min Huang ◽  
Wenna Wang
Keyword(s):  
Mass Spectrometry ◽  
Nuclear Magnetic Resonance ◽  
Gas Chromatography ◽  
Petroleum Ether ◽  
Butyl Alcohol ◽  
The Other ◽  
Gas Chromatography Mass Spectrometry ◽  
Aromatic Ketones ◽  
Spectrum Characteristic ◽  
Main Components

Abstract Dalbergia cochinchinensis can be distinguished from Dalbergia retusa, Dalbergia bariensis, and Dalbergia oliveri quickly using infrared spectrum characteristic peaks as shown in a previous study. To investigate the components corresponding to the infrared characteristic peaks of Dalbergia cochinchinensis, petroleum ether, ethyl acetate, and butyl alcohol were sequentially used to extract the dispersion liquid of D. cochinchinensis. The petroleum ether extracts were further fractionated by column chromatography, using Fourier-transform infrared spectroscopy (FTIR) to track the characteristic components during separation. FTIR spectra of petroleum ether extractives indicated the presence of aromatic ketones and olefin compounds. The gas chromatography–mass spectrometry research showed some main components and gave possible structure. Furthermore, their detailed structures were characterized thorough a nuclear magnetic resonance approach, and then two possible components (3,5-dihydroxy-7-methoxy-2-phenylchroman-4-one and 3,5,7-trihydroxy-2-phenylchroman-4-one) were identified.

scholarly journals Determination of the Volatile Profile of Lemon Peel Oils as Affected by Rootstock

Foods ◽  
2020 ◽  
Vol 9 (2) ◽  
pp. 241 ◽  
Author(s):  
Marlene G. Aguilar-Hernández ◽  
Paola Sánchez-Bravo ◽  
Francisca Hernández ◽  
Ángel A. Carbonell-Barrachina ◽  
Joaquín J. Pastor-Pérez ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
The Other ◽  
Gas Chromatography Mass Spectrometry ◽  
Citrus Limon ◽  
Citrus Aurantium ◽  
Volatile Profile ◽  
The Usa ◽  
Citrus Macrophylla

Citrus limon (L.) Burm is an important crop that grows between latitudes 30° North and 30° South, the main producers being China, the USA, Mexico, India, Brazil, and Spain. In Spain, lemon grows mainly in Mediterranean areas such as Murcia, Valencia, and Andalucía. The most cultivated varieties are “Fino” and “Verna”. In this study, five varieties of lemon, “Verna”, “Bétera”, “Eureka”, “Fino 49”, and “Fino 95” were evaluated on different rootstocks: three new Forner-Alcaide (“FA13”, “FA5”, “FA517”), Citrus macrophylla, Wester, and Citrus aurantium L. Hydrodistillation was used to obtain essential oil from fresh peels and then the volatile profile was studied by gas chromatography-mass spectrometry (GC-MS). A total of 26 volatile compounds were identified, limonene being the main one followed by β-pinene, γ-terpinene, sabinene, and α-pinene. The results revealed that Forner-Alcaide rootstocks (“FA5” > “FA517” > “FA13”) proved to be the best rootstocks for the aroma quality as they led to high volatile contents, followed by C. aurantium and C. macrophylla. Among the other varieties, the most aromatic one was “Eureka”. The whole trend was as follows (in decreasing order): “Eureka” > “Bétera” > “Fino 95” > “Verna” > “Fino 49”.

scholarly journals The scent gland chemistry of neogoveid cyphophthalmids (Opiliones): an unusual methyljuglone from Metasiro savannahensis

Chemoecology ◽  
2019 ◽  
Vol 29 (5-6) ◽  
pp. 189-197
Author(s):  
Günther Raspotnig ◽  
Felix Anderl ◽  
Ronald M. Clouse
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
The Other ◽  
Gas Chromatography Mass Spectrometry ◽  
Methyl Ketones ◽  
Scent Gland ◽  
Exocrine Secretions ◽  
Chromatography Mass Spectrometry ◽  
The Family ◽  
Antifungal Potential

Abstract While the chemistries of scent gland secretions from a few selected species of three families of Cyphophthalmi, namely Sironidae, Pettalidae, and Stylocellidae, have already been reported and found to consist of complex blends of naphthoquinones and methyl ketones, nothing is known about the other families. We here report on the secretions of Metasiro savannahensis Clouse and Wheeler (Zootaxa 3814:177–201, 2014), a first representative of the family Neogoveidae. The secretions from males, females and one juvenile were extracted and analyzed by gas chromatography–mass spectrometry. Twenty-five compounds were identified, all of which belong to the chemical classes of naphthoquinones and methyl ketones, confirming a hypothesized chemical uniformity of cyphophthalmid exudates. One major naphthoquinone compound, however, was new for cyphophthalmids and for arthropod exocrine secretions in general: a methyljuglone isomer, 6-methyljuglone (= 6-MJ; iupac name: 5-hydroxy-6-methyl-1,4-naphthoquinone), amounted for about 20% of the secretion and was eventually identified by synthesis. Hydroxy-naphthoquinones and their derivatives are known to possess a variety of antibiotic effects, probably enhancing the antimicrobial/antifungal potential of the Metasiro-secretion. Currently, without further data on neogoveids, the compound represents a chemical autapomorphy of M. savannahensis, and—just as the strange chloro-naphthoquinones of Sironidae and Pettalidae—adds to the repertoire of unusual naphthoquinone compounds across the Cyphophthalmi.

scholarly journals Application Mass Spectrum Method in Determination Compound Bioactive of The Essential Oil from Leaves and Stems of Clove (Syzigium aromaticum)

2021 ◽  
Vol 8 (1) ◽  
pp. 74
Author(s):  
Akhmad Rifai ◽  
Nur Amin Riyadi
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Mass Spectrum ◽  
Essential Oil ◽  
The Other ◽  
Gas Chromatography Mass Spectrometry ◽  
Major Constituent ◽  
Clove Oil ◽  
Caryophyllene Oxide ◽  
South Sulawesi

The essential oil from leaves and stems of clove (Syzigium Aromaticum) growing in Siwa (South Sulawesi, Indonesia), was obtained by hydrodistillation and gas chromatography-mass spectrometry (GC-MS) was used to identify the constituent of the sample. There were five most compounds bioactive contained in the clove oil of the leaves and stems, namely eugenol, b-caryophyllene, 1,4,7- cycloundecatriene-1,5,9,9 tetramethyl, caryophyllene oxide, and cadinene. The eugenol compound, which is contained in the stems is 55.83% bigger than the leaves, which is 45.3%. But on the contrary, other compounds in the leaves are b-caryophyllene (25.57%), 1,4,7- cycloundecatriene-1,5,9,9 tetramethyl (8.65%), caryophyllene oxide (4.64%) and cadinene (2.31%) greater than the other compounds in the stems, namely b-caryophyllene (19.72%), 1,4,7- cycloundecatriene-1,5,9,9 tetramethyl (4.38%), caryophyllene oxide (3.48%) and cadinene (0.5%). Eugenol is the major constituent of the clove oil that can be used in pharmacology as antivirus, antimicrobial, antiseptic, and industry of perfume.

scholarly journals GC-MS analysis of Adulterants in Captagon Tablet

2020 ◽  
Vol 1 (1) ◽  
pp. 14-21
Author(s):  
Ali Zaid Alshehri ◽  
Mohammed saeed Al Qahtani ◽  
Mohammed Aedh Al Qahtani ◽  
Abdulhadi M Faeq ◽  
Jawad Aljohani ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Middle East ◽  
General Purpose ◽  
The Other ◽  
Gas Chromatography Mass Spectrometry ◽  
Active Compounds ◽  
Other Substances ◽  
Positive Results ◽  
Dimethyl Polysiloxane

In secret laboratories various synthetic or semi-synthetic amphetamine-type stimulants (ATS) are produced and processed. Stimulants of the form of amphetamine (ATS) are the second most common illegal drugs used worldwide, following cannabis. ATS production has increased worldwide, particularly from the Middle East. Fenethylline (CaptagonTM), a derivative of amphetamine, is commonly marketed as a street drug. Objective: this research aimed at applying gas chromatography / mass spectrometry (GC / MS) for fenethylline profiling of confiscated samples from the Saudi market. Methodology: The study of GC / MS was conducted on a general-purpose column (30 mm 0.25 mm i.d) filled with 0.25 mm cross bond, 5% diphenyl dimethyl polysiloxane (Rtx-5MS). The mass was worked in the process of impacting the electron. Results and discussion: Analyzed samples showed positive results for amphetamine in concentrations ranging from 0.07 to 43.02 percent of the substance in 60 percent of the samples. Caffeine was also present in 60 per cent of the samples at levels between 0.61 and 60.31 per cent. In the MS of the other active compounds were recorded in different proportions. Lastly, the presence of other substances in fenethylline samples may contribute to intoxication.

Variation in Bud Exudate Composition of Populus nigra Assessed by Gas Chromatography-Mass Spectrometry

1990 ◽  
Vol 45 (9-10) ◽  
pp. 931-936 ◽  
Author(s):  
W. Greenaway ◽  
S. English ◽  
F. R. Whatley
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Populus Nigra ◽  
The Other ◽  
Gas Chromatography Mass Spectrometry ◽  
Chromatography Mass Spectrometry

Abstract Bud Exudate, GC-MS Bud exudates from twelve clones of Populus nigra originating from seven countries were analyzed by gas chromatography-mass spectrometry and the principal compounds identified. Specimens of P. nigra var betulifolia differed in bud exudate com position from the other specimens analyzed, and were more similar in exudate com position to P. deltoides than were the other specimens. The range of bud exudate com position was greater than that which would be expected to occur within a single coherent species.

Sign in / Sign up

Export Citation Format

Share Document