scholarly journals Production of New Unsaturated Lipids during Wood Decay by Ligninolytic Basidiomycetes

2002 ◽  
Vol 68 (3) ◽  
pp. 1344-1350 ◽  
Author(s):  
Ana Gutiérrez ◽  
José C. del Río ◽  
María J. Martínez-Íñigo ◽  
María J. Martínez ◽  
Ángel T. Martínez
Keyword(s):  
Fatty Acids ◽  
Unsaturated Fatty Acids ◽  
Wood Decay ◽  
Dicarboxylic Acids ◽  
White Rot ◽  
Free Form ◽  
Initial Increase ◽  
Aliphatic Chain ◽  
Sterol Esters ◽  
Unsaturated Lipids

ABSTRACT Lipids were analyzed by gas chromatography-mass spectrometry for a 7-week in vitro decay of eucalypt wood by four ligninolytic basidiomycetes. The sound wood contained up to 75 mg of lipophilic compounds per 100 g of wood. Hydrolysis of sterol esters, which represented 38% of total wood lipids, occurred during the fungal decay. The initial increase of linoleic and other free unsaturated fatty acids paralleled the decrease of sterol esters. Moreover, new lipid compounds were found at advanced stages of wood decay that were identified from their mass spectra as unsaturated dicarboxylic acids consisting of a long aliphatic chain attached to the C-3 position of itaconic acid. These dicarboxylic acids were especially abundant in the wood treated with Ceriporiopsis subvermispora (up to 24 mg per 100 g of wood) but also were produced by Phlebia radiata, Pleurotus pulmonarius, and Bjerkandera adusta. We hypothesize that three main alkylitaconic acids (tetradecylitaconic, cis-7-hexadecenylitaconic, and hexadecylitaconic acids) are synthesized by fungi in condensation reactions involving palmitic, oleic, and stearic acids. We suggest that both wood unsaturated fatty acids (present in free form or released from esters during natural decay) and unsaturated metabolites synthesized by fungi could serve as a source for peroxidizable lipids in lignin degradation by white rot basidiomycetes.

Quantum mechanically calculated NIR spectra of fatty acids

NIR news ◽  
2017 ◽  
Vol 28 (8) ◽  
pp. 11-16 ◽  
Author(s):  
Justyna Grabska
Keyword(s):  
Fatty Acids ◽  
Near Infrared ◽  
Unsaturated Fatty Acids ◽  
Theoretical Study ◽  
Calculated Data ◽  
Nir Spectroscopy ◽  
Theoretical Modelling ◽  
Aliphatic Chain ◽  
Computing Power ◽  
Technical Article

The advances in theory as well as steady development of the computing power have made quantum mechanical simulation of NIR spectra feasible. Recently, we have demonstrated the ability to accurately reproduce in theory the NIR spectra of several complex biomolecules, including fatty acids. In the present technical article, some of these achievements are overviewed. Examples of theoretical modelling of NIR spectra of short- (aliphatic chain up to four carbon atoms) and medium-chain (aliphatic chain counting six carbon atoms) fatty acids are presented and discussed. The calculated data are used directly for explaining the experimental NIR spectra of these systems. Spectral features distinctive to saturated vs. unsaturated fatty acids are essential in various types of samples typically treated by NIR spectroscopy; i.e. food, tissue, biomaterial, etc. Therefore, the theoretical study offers considerable support for basic and applied NIRS. An example of possible practical application of the results of theoretical study for biochemical studies is provided. The topic discussed here has been presented during the 18th International Conference on Near Infrared Spectroscopy (ICNIRS-2017) in Copenhagen, June 2017.

Lipidic compounds from the extract of the springtail Tetrodontophora bielanensis (WAGA)

1986 ◽  
Vol 51 (4) ◽  
pp. 948-955 ◽  
Author(s):  
Karel Stránský ◽  
Antonín Trka ◽  
Miloš Buděšínský ◽  
Milan Streibl
Keyword(s):  
Fatty Acids ◽  
Unsaturated Fatty Acids ◽  
Secondary Alcohol ◽  
Spectroscopic Methods ◽  
Sterol Esters ◽  
Free Sterols

Surface and internal lipidic compounds from the springtail Tetrodontophora bielanensis (WAGA) were investigated. Using chromatographic and spectroscopic methods the following compounds were detected: n-alkanes (C15 - C35), lycopane (C40H82), olefin C40H80, seven groups of esters (including sterol esters), secondary alcohol C40H82O, triacyl glycerols, free saturated and unsaturated fatty acids (C12 - C22) and free sterols (cholesterol and desmosterol).

The effect of ozone on leaf cell membranes

1973 ◽  
Vol 51 (6) ◽  
pp. 1213-1219 ◽  
Author(s):  
Elizabeth S. Swanson ◽  
William W. Thomson ◽  
J. Brian Mudd
Keyword(s):  
Fatty Acids ◽  
Cell Membranes ◽  
Unsaturated Fatty Acids ◽  
Membrane Lipids ◽  
Ozone Treatment ◽  
Leaf Cell ◽  
Electron Microscopic ◽  
Unsaturated Lipids ◽  
Significant Difference

The objective of this study was to determine the effects of ozone on membrane lipids and on the electron-density patterns of cell membranes in electron micrographs. Analysis of fatty acids from tobacco leaves fumigated with ozone indicated that there was no significant difference between the ozone-treated and the control plants in the relative amounts of the fatty acids. This suggests that if the primary site of ozone action is unsaturated lipids in membranes then the amounts of affected unsaturated fatty acids are too small to be detected by gas chromatography. In support of this, characteristic electron-microscopic images of membranes are observed in cells of fumigated leaves. However, measurements of the length and width of the chloroplasts and the determination of axial ratios indicated that the ozone treatment resulted in a shrinkage of the chloroplasts. In contrast, mitochondrial changes are apparently explained in terms of ozone-induced swelling.

OZONOLYSIS OF UNSATURATED FATTY ACIDS: I. OZONOLYSIS OF OLEIC ACID

1961 ◽  
Vol 39 (10) ◽  
pp. 1956-1963 ◽  
Author(s):  
R. G. Ackman ◽  
M. E. Retson ◽  
L. R. Gallay ◽  
F. A. Vandenheuvel
Keyword(s):  
Hydrogen Peroxide ◽  
Fatty Acids ◽  
Oleic Acid ◽  
Formic Acid ◽  
Unsaturated Fatty Acids ◽  
Fission Products ◽  
Dicarboxylic Acids ◽  
Total Recovery ◽  
Subsequent Decomposition ◽  
By Products

Ozonolysis of oleic acid in methanol, a reacting solvent, with subsequent decomposition of the ozonide products by hydrogen peroxide in formic acid, gives yields of principal dicarboxylic acid fission products exceeding 95% with a minimum of secondary acidic products. The method is highly reproducible and offers unique advantages in the total recovery of the dicarboxylic acids and the elimination of peroxidic materials. The principal non-acidic by-products were tentatively identified as the Cs alcohols and their formyl esters.

scholarly journals Production of dicarboxylic acids from novel unsaturated fatty acids by laccase-catalyzed oxidative cleavage

2016 ◽  
Vol 80 (11) ◽  
pp. 2132-2137 ◽  
Author(s):  
Michiki Takeuchi ◽  
Shigenobu Kishino ◽  
Si-Bum Park ◽  
Nahoko Kitamura ◽  
Hiroko Watanabe ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Unsaturated Fatty Acids ◽  
Dicarboxylic Acids ◽  
Oxidative Cleavage

scholarly journals FATTY ACID COMPOSITION AND DISTRIBUTION OF 14C-GLUCOSE ACTIVITY IN LIPID CLASSES OF PORCINE SUBCUTANEOUS FAT

1974 ◽  
Vol 54 (4) ◽  
pp. 645-650 ◽  
Author(s):  
A. W. MYRES ◽  
J. P. BOWLAND
Keyword(s):  
Fatty Acids ◽  
Adipose Tissue ◽  
Fatty Acid Composition ◽  
Fatty Acid ◽  
Acid Composition ◽  
Unsaturated Fatty Acids ◽  
Specific Activity ◽  
Subcutaneous Fat ◽  
Free Form ◽  
Considerable Proportion

Subcutaneous backfat samples from pigs receiving diets with or without 250 ppm supplemental copper were separated into glycerides (GLY) and free fatty acids (FFA) and the fatty acid composition of each fraction was determined. In addition, the effect of dietary copper on the distribution of 14C- from U-14C-glucose between GLY and FFA in depot fat was examined. The basal diet consisted of 90.1% barley and 7.5% herring meal. Results from three experiments suggest that copper may act in adipose tissue of the pig by increasing the proportion of unsaturated fatty acids (UFA) in both the FFA and GLY fractions in animals of 60–70 kg liveweight. The distribution of 14C activity in the fatty acids of the GLY and FFA fractions indicated a higher specific activity of the FFA fraction compared with that of the GLY fatty acids. The GLY/FFA ratio was lower for copper-supplemented animals kept in a cold environment. The overall data suggest that a considerable proportion of newly synthesized acids exists in adipose tissue in the free form.

Dark Oxidation of Unsaturated Lipids by the Photoxidized 8-Methoxypsoralen

1982 ◽  
Vol 37 (1-2) ◽  
pp. 70-74 ◽  
Author(s):  
A. Ya. Potapenko ◽  
M. V. Moshnin ◽  
A. A. Krasnovsky ◽  
V. L. Sukhorukov
Keyword(s):  
Fatty Acids ◽  
Quantum Yield ◽  
Singlet Oxygen ◽  
Uv Irradiation ◽  
Rate Constants ◽  
Unsaturated Fatty Acids ◽  
Unsaturated Lipids ◽  
Liposome Suspension ◽  
Kinetics Of ◽  
Direct Attack

8-Methoxypsoralen (8-MOP) in ethanol, acetone, benzene, or CCl4 is photoxidized under UV- irradiation (320-400 nm). Photoxidized 8-MOP (O2-8-MOP) is stable in the organic solvents, but it is destructed in water or in liposome suspension. The destruction rate constants are 0.04 s-1 in water and 0.004 s-1 in liposome membranes as estimated by the kinetics of the chemilumin­escence accompanying the destruction. In course of O2-8-MOP destruction the residues of phospholipid unsaturated fatty acids are oxidized. Generation of the singlet oxygen (1⊿g) by excited 8-MOP is observed neither in acetone, nor in ethanol. Quantum yield of 1⊿g formation in CCl4 is less than 3%. A pattern is proposed for 8-MOP-sensitized oxidation of unsaturated lipids proceeding without direct attack of lipids by singlet oxygen.

Location of carbon-carbon double bonds in unsaturated lipids using microdroplet mass spectrometry

The Analyst ◽  
2021 ◽  
Author(s):  
Kai Luo ◽  
Hao Chen ◽  
Richard N. Zare
Keyword(s):  
Mass Spectrometry ◽  
Aqueous Solution ◽  
Fatty Acids ◽  
Fatty Acid ◽  
Unsaturated Fatty Acid ◽  
Unsaturated Fatty Acids ◽  
Chloroauric Acid ◽  
Double Bonds ◽  
Unsaturated Lipids

An aqueous solution containing unsaturated fatty acids (100 µM) or lipids (50 µg/mL) and chloroauric acid (HAuCl4, 10 µM) is electrosprayed (-4.5 kV for unsaturated fatty acid and +4.0 kV...

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